Patent Application
20240035172
This application relates generally to electrochemical cells configured to form acid and base solutions in the desired concentrations.
Direct electrosynthesis of sodium hydroxide (NaOH) and hydrochloric acid (HCl) or sulfuric acid (H2SO4) from sodium chloride (NaCl) or sodium sulfate (Na2SO4) brine can be a cost-effective process to generate both concentrated NaOH and HCl/H2SO4 solution for chemical industries. This electrosynthesis process usually uses the water splitting reaction to generate H+ and OH−, then combine with the Cl− and Na+ produced by splitting the NaCl with two ion-exchange membranes for acid and base production. The half-reactions and their standard potential of anode (R2) and cathode (R1) are,
At pH=14,2H2O−2e−→H2+2OH−φ=−0.83V vs. SHE (R1)
At pH=0,2H2O+4e−→O2+4H+φ=1.23V vs. SHE (R2)
Various types of electrolyzers are known and used currently in the field. One of the challenges of using known electrolyzers is the high pH difference between various chambers of the device. As a result, the concentrations of electro-synthesized acid and base are limited to less than 0.5 mol/L. To solve the challenge of maintaining a high pH difference (0 to 14) in a single electrolyzer while still achieving a high concentration of acid and base, the bipolar membrane electrodialysis (BMED) method has been employed. While such a method allows obtaining acid/base concentrations up to 3 mol/L, it still suffers from low energy efficiency and high capital cost.
Thus, new, more efficient and cost-effective electrolyzer systems are needed. New methods for using these systems and forming acid/base in desired concentrations are also needed. These needs and other needs are at least partially satisfied by the present disclosure.
The present disclosure is directed to an electro-synthesizer unit, wherein the electro-synthesizer unit is a flow unit comprising: a first compartment comprising: a first inlet configured to receive a first flow of a first electrolyte solution; a cathode; the first electrolyte solution that is in electrical and fluid communication with the cathode; wherein a pH of the first electrolyte solution is about 6≤pH≤15.5; wherein the cathode is configured to generate a hydrogen gas and a hydroxide; one or more outlets configured to remove the generated hydrogen gas and/or a base solution comprising the generated hydroxide from the first compartment; a second compartment comprising: a second inlet configured to receive a second flow of a second electrolyte solution, a third inlet configured to receive a stream comprising a hydrogen gas, an anode; and the second electrolyte solution that is in electrical and fluid communication with the anode; wherein a pH of the second electrolyte solution is about −1.5≤pH≤8; wherein the anode is configured to oxidate the hydrogen gas to generate hydrogen ions; an outlet configured to remove an acid solution comprising the generated hydrogen ions from the second compartment; and a third compartment positioned between and in fluid communication with the first compartment and the second compartment, wherein the third compartment is separated from the first compartment with one or more cation exchange membranes and is separated from the second compartment with one or more anion exchange membranes; wherein the third compartment comprises: a fourth inlet configured to receive a third flow of a third electrolyte solution, the third electrolyte solution, wherein a pH of the third electrolyte solution is about 4≤pH≤10; and an outlet configured to remove the third electrolyte from the third compartment.
In further aspects, the stream comprises the hydrogen gas generated in the first compartment. In other aspects, the stream comprising the generated hydrogen gas is directly fed from the first compartment to the second compartment. While in still further aspects, the stream comprises the hydrogen gas supplied from an external source.
Also disclosed herein is a system comprising one or more of the electro-synthesizer units of any examples disclosed herein.
In still further aspects, disclosed herein is a method comprising: providing the electro-synthesizer unit of any examples disclosed herein, or the system of any examples disclosed herein; flowing the first electrolyte, the second electrolyte, and the third electrolyte; generating a hydrogen gas stream and a hydroxide on the cathode in the first compartment; generating hydrogen ions on the anode in the second compartment; directing the generated hydrogen gas stream into the second compartment; and collecting a generated base solution and a generated acid solution.
Additional advantages will be set forth in part in the description which follows, and in part will be obvious from the description or can be learned by practice of the aspects described below. The advantages described below will be realized and attained by means of the chemical compositions, methods, and combinations thereof, particularly pointed out in the appended claims. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and is not restrictive of the invention, as claimed.
The accompanying figures, which are incorporated in and constitute a part of this specification, illustrate several aspects described below.
The present invention can be understood more readily by reference to the following detailed description, examples, drawings, and claims, and their previous and following description. However, before the present articles, systems, and/or methods are disclosed and described, it is to be understood that this invention is not limited to the specific or exemplary aspects of articles, systems, and/or methods disclosed unless otherwise specified, as such can, of course, vary. It is also to be understood that the terminology used herein is for the purpose of describing particular aspects only and is not intended to be limiting.
The following description of the invention is provided as an enabling teaching of the invention in its best, currently known aspect. To this end, those skilled in the relevant art will recognize and appreciate that many changes can be made to the various aspects of the invention described herein while still obtaining the beneficial results of the present invention. It will also be apparent that some of the desired benefits of the present invention can be obtained by selecting some of the features of the present invention without utilizing other features. Accordingly, those of ordinary skill in the pertinent art will recognize that many modifications and adaptations to the present invention are possible and may even be desirable in certain circumstances and are a part of the present invention. Thus, the following description is again provided as illustrative of the principles of the present invention and not in limitation thereof.
As used herein, the terms “optional” or “optionally” mean that the subsequently described event or circumstance can or cannot occur and that the description includes instances where said event or circumstance occurs and instances where it does not.
It is appreciated that certain features of the disclosure, which are, for clarity, described in the context of separate aspects, can also be provided in combination in a single aspect. Conversely, various features of the disclosure, which are, for brevity, described in the context of a single aspect, can also be provided separately or in any suitable subcombination.
As used in the description and the appended claims, the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise. Thus, for example, a reference to “a unit” includes two or more such units, and a reference to “a membrane” includes two or more such membranes and the like.
It is also to be understood that the terminology used herein is for the purpose of describing particular aspects only and is not intended to be limiting. As used in the specification and in the claims, the term “comprising” can include the aspects “consisting of” and “consisting essentially of.” Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In this specification and in the claims which follow, reference will be made to a number of terms that shall be defined herein.
For the terms “for example” and “such as,” and grammatical equivalences thereof, the phrase “and without limitation” is understood to follow unless explicitly stated otherwise.
The expressions “ambient temperature” and “room temperature” as used herein are understood in the art and refer generally to a temperature from about 20° C. to about 35° C.
Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the disclosure are approximations, the numerical values set forth in the specific examples are reported as precisely as possible. Any numerical value, however, inherently contains certain errors necessarily resulting from the standard deviation found in their respective testing measurements. Furthermore, when numerical ranges of varying scope are set forth herein, it is contemplated that any combination of these values, inclusive of the recited values, may be used. Further, ranges can be expressed herein as from “about” one particular value and/or to “about” another particular value. When such a range is expressed, another aspect includes from the one particular value and/or to the other particular value.
Similarly, when values are expressed as approximations, by use of the antecedent “about,” it will be understood that the particular value forms another aspect. It will be further understood that the endpoints of each of the ranges are significant both in relation to the other endpoint and independently of the other endpoint. Unless stated otherwise, the term “about” means within 5% (e.g., within 2% or 1%) of the particular value modified by the term “about.”
Throughout this disclosure, various aspects of the invention can be presented in a range format. It should be understood that the description in range format is merely for convenience and brevity and should not be construed as an inflexible limitation on the scope of the invention. Accordingly, the description of a range should be considered to have specifically disclosed all the possible subranges as well as individual numerical values within that range. For example, a description of a range such as from 1 to 6 should be considered to have specifically disclosed subranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as individual numbers within that range, for example, 1, 2, 2.7, 3, 4, 5, 5.3, 6 and any whole and partial increments therebetween. This applies regardless of the breadth of the range.
As used herein, the term “composition” is intended to encompass a product comprising the specified ingredients in the specified amounts, as well as any product which results, directly or indirectly, from a combination of the specified ingredients in the specified amounts.
References in the specification and concluding claims to parts by weight of a particular element or component in a composition denotes the weight relationship between the element or component and any other elements or components in the composition or article for which a part by weight is expressed. Thus, in a mixture containing 2 parts by weight of component X and 5 parts by weight, components Y, X, and Y are present at a weight ratio of 2:5 and are present in such a ratio regardless of whether additional components are contained in the mixture.
A weight percent (wt. %) of a component, unless specifically stated to the contrary, is based on the total weight of the formulation or composition in which the component is included.
It will be understood that when an element is referred to as being “connected” or “coupled” or “being in fluid and/or electrical communication” to another element, it can be directly connected, coupled, or be on fluid and/or electrical communication to the other element, or intervening elements may be present. In contrast, when an element is referred to as being “directly connected,” “directly coupled,” or “in direct fluid and/or electrical communication” to another element, there are no intervening elements present. Other words used to describe the relationship between elements or layers should be interpreted in a like fashion (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” “on” versus “directly on”).
As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items.
It will be understood that the terms “first,” “second,” etc., may be used herein to describe various elements, components, solutions, regions, layers, and/or sections. These elements, components, solutions, regions, layers, and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, solution, region, layer, or section from another element, component, solution, region, layer, or section. Thus, a first element, component, solution, region, layer, or section discussed below could be termed a second element, component, solution, region, layer, or section without departing from the teachings of example embodiments.
As used herein, the term “substantially” means that the subsequently described event or circumstance completely occurs or that the subsequently described event or circumstance generally, typically, or approximately occurs.
Still further, the term “substantially” can, in some aspects, refer to at least about 80%, at least about 85%, at least about 90%, at least about 91%, at least about 92%, at least about 93%, at least about 94%, at least about 95%, at least about 96%, at least about 97%, at least about 98%, at least about 99%, or about 100% of the stated property, component, composition, or other condition for which substantially is used to characterize or otherwise quantify an amount.
In other aspects, as used herein, the term “substantially free,” when used in the context of a composition or component of a composition that is substantially absent, is intended to refer to an amount that is then about 1% by weight, e.g., less than about 0.5% by weight, less than about 0.1% by weight, less than about 0.05% by weight, or less than about 0.01% by weight of the stated material, based on the total weight of the composition.
As used herein, the term “recirculated-in-a-loop” defines a system where all streams of the system are recirculating within the loop. It is understood that substantially all streams disclosed herein are recirculated. However, in some examples, if needed, external streams are provided. Numerous general purpose or special purpose computing devices environments or configurations can be used with the systems and methods disclosed herein. Examples of well-known computing devices, environments, and/or configurations that can be suitable for use include but are not limited to, personal computers, server computers, handheld or laptop devices, smartphones, multiprocessor systems, microprocessor-based systems, network personal computers (PCs), minicomputers, mainframe computers, embedded systems, distributed computing environments that include any of the above systems or devices, and the like.
Computing devices, as disclosed herein, can contain communication connection(s) that allow the device to communicate with other devices if desired. Computing devices can also have input device(s) such as a keyboard, mouse, pen, voice input device, touch input device, etc. Output device(s) such as a display, speakers, printer, etc., can also be included. All these devices are well-known in the art and need not be discussed at length here.
Computer-executable instructions, such as program modules being executed by a computer, can be used. Generally, program modules include routines, programs, objects, components, data structures, etc., that perform particular tasks or implement particular abstract data types. Distributed computing environments can be used where tasks are performed by remote processing devices that are linked through a communications network or other data transmission medium. In a distributed computing environment, program modules and other data can be located in both local and remote computer storage media, including memory storage devices.
In its most base configuration, a computing device typically includes at least one processing unit and memory. Depending on the exact configuration and type of computing device, memory can be volatile (such as random-access memory (RAM)), non-volatile (such as read-only memory (ROM), flash memory, etc.), or some combination of the two.
Computing devices can have additional features/functionality. For example, a computing device can include additional storage (removable and/or non-removable), including, but not limited to, magnetic or optical disks or tape.
Computing device typically includes a variety of computer-readable media. Computer-readable media can be any available media that can be accessed by the device and includes both volatile and non-volatile media, removable and non-removable media.
Computer storage media include volatile and non-volatile and removable and non-removable media implemented in any method or technology for information storage, such as computer-readable instructions, data structures, program modules, or other data. Memory, removable storage, and non-removable storage are all examples of computer storage media. Computer storage media include but are not limited to, RAM, ROM, electrically erasable program read-only memory (EEPROM), flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computing device. Any such computer storage media can be part of a computing device.
Computing devices, as disclosed herein, can contain communication connection(s) that allow the device to communicate with other devices. The connection can be wireless or wired. Computing devices can also have input device(s) such as a keyboard, mouse, pen, voice input device, touch input device, etc. Output device(s) such as a display, speakers, printer, etc., can also be included. All these devices are well-known in the art and need not be discussed at length here.
It should be understood that the various techniques described herein can be implemented in connection with hardware components or software components or, where appropriate, with a combination of both. Illustrative types of hardware components that can be used include Field-programmable Gate Arrays (FPGAs), Application-specific Integrated Circuits (ASICs), Application-specific Standard Products (ASSPs), System-on-a-chip systems (SOCs), Complex Programmable Logic Devices (CPLDs), etc. The methods and apparatus of the presently disclosed subject matter, or certain aspects or portions thereof, can take the form of program code (i.e., instructions) embodied in tangible media, such as CD-ROMs, hard drives, or any other machine-readable storage medium where, when the program code is loaded into and executed by a machine, such as a computer, the machine becomes an apparatus for practicing the presently disclosed subject matter.
While aspects of the present invention can be described and claimed in a particular statutory class, such as the system statutory class, this is for convenience only and one of ordinary skill in the art will understand that each aspect of the present invention can be described and claimed in any statutory class. Unless otherwise expressly stated, it is in no way intended that any method or aspect set forth herein be construed as requiring that its steps be performed in a specific order. Accordingly, where a method claim does not specifically state in the claims or descriptions that the steps are to be limited to a specific order, it is in no way intended that an order be inferred in any respect. This holds for any possible non-express basis for interpretation, including matters of logic with respect to the arrangement of steps or operational flow, plain meaning derived from grammatical organization or punctuation, or the number or type of aspects described in the specification.
The present invention may be understood more readily by reference to the following detailed description of various aspects of the invention and the examples included therein and to the Figures and their previous and following description.
Disclosed herein are aspects directed to an electro-synthesizer unit. In certain aspects, the electro-synthesizer unit is a flow unit. In further aspects, the electro-synthesizer unit comprises a number of compartments.
The first electrolyte comprises a base. Any known in the art bases can be used. For example, the base can comprise one or more of sodium hydroxide, lithium hydroxide, potassium hydroxide, magnesium hydroxide, calcium hydroxide, ammonium hydroxide, amine-based bases, sodium acetate, or any combination thereof. In still further aspects, the bases can comprise amine-based bases, such as primary, secondary, tertiary amines, or any combination thereof. It is understood that other organic bases can be utilized. In still further aspects, the base can be strong or weak, depending on the desired pH, as commonly defined in chemical arts. In yet still further aspects, the bases can also comprise Lewis bases. It is understood that the base can be present in any concentration to provide the desired pH. The concentration can be measured in M, or it can be measured in wt %, depending on the desired application. In still further aspects, the base can be present in any concentration from M to about 20 M, including exemplary values about 0.001 M, about 0.005 M, about M, about 0.05 M, about 0.1 M, about 0.5 M, about 1 M, about 2 M, about 3 M, about 4 M, about 5 M, about 6 M, about 7 M, about 8 M, about 9 M, about 10 M, about 11 M, about 12 M, about 13 M, about 14 M, about 15 M, about 16 M, about 17 M, about 18 M, and about 19 M. It is understood that these values are only exemplary, and the base can be present in a concentration having any values between any two foregoing values.
In still further aspects, the first electrolyte comprises one or more inorganic salts. In some exemplary and unlimiting aspects, the first electrolyte can comprise a salt without the presence of the base. Yet, in other aspects, the first electrolyte can comprise only a base. In yet still further aspects, the first electrolyte can comprise the salt and the base in any desired concentration. It is understood that the salt is present in the first electrolyte can be at any concentration before its saturation. In certain aspects, the salt and the base present in the electrolyte can have the same cation or a different cation. In yet other aspects, the combination of various salts (having the same cations but different anions or the same anions but different cations) can be present. Yet, in still further aspects, the combination of the various bases can also be present in the first electrolyte.
In still further aspects, the one or more inorganic salt can comprise chlorides, sulfates, nitrates, phosphates, citrates, formates, lactates, tartrates, malates, fumarates, oxalates, succinates, gluconates, ascorbates, acetates of alkaline metals and/or alkaline-earth metals, or mixtures thereof.
The disclosed herein unit 100 further comprises a second compartment 104. The second compartment 104 comprises an anode 110. The anode 110 has a first surface 109 and a second surface 111. In still further aspects, the second compartment 104 comprises a second inlet (not shown) configured to receive a second flow of a second electrolyte solution 118 and a third inlet (not shown) configured to receive a stream 120 comprising a hydrogen gas.
In still further aspects, the second inlet of the second compartment extends into a first channel, and the third inlet extends into a second channel. In such aspects, the first channel is positioned between the anion exchange membrane 114 and the first surface 109 of the anode 110 and hosts the second electrolyte 118. While in other aspects, the second channel is positioned abut the second surface 111 of the anode 110 and is configured to receive the hydrogen gas stream 120.
In certain aspects, the hydrogen gas stream 120 can comprise the hydrogen gas generated in the first compartment. In such aspects, the generated hydrogen gas is directly fed from the first compartment to the second compartment, forming the looping of the hydrogen gas between the first and the second compartment of the unit. However, also disclosed herein are aspects wherein the hydrogen gas stream 120 comprises a hydrogen gas supplied from any external source, such as a hydrogen tank, externally generated hydrogen, and the like. In yet still further aspects, the hydrogen gas stream 120 can comprise both the hydrogen generated in the first compartment and the hydrogen gas received from the external source. In still further aspects, disclosed are implementations where an operator can switch the supply of the hydrogen gas stream 120 as desired.
In still further aspects, the second electrolyte comprises an acid. Any known in the art acids can be used. For example, the acid can comprise one or more of hydrochloric acid, hydrobromic acid, hydroiodic acid, sulfurous acid, sulfuric acid, nitric acid, phosphorous acid, phosphoric acid, hypochlorous acid, chlorous acid, chloric acid, perchloric acid, formic acid, acetic acid, carbonic acid, or any combination thereof. In still further aspects, the acids can comprise organic acids. In still further aspects, the acid can be strong or weak, depending on the desired pH, as commonly defined in chemical arts. In yet still further aspects, the acid can also comprise Lewis acids. It is understood that the acid can be present in any concentration to provide for the desired pH. The concentration can be measured in M, or it can be measured in wt %, depending on the desired application. In still further aspects, the acid can be present in any concentration from 0 M to about 10 M, including exemplary values about 0.001 M, about 0.005 M, about 0.01 M, about 0.05 M, about 0.1 M, about 0.5 M, about 1 M, about 2 M, about 3 M, about 4 M, about 5 M, about 6 M, about 7 M, about 8 M, and about 9 M. It is understood that these values are only exemplary, and the acid can be present in a concentration having any values between any two foregoing values.
In still further aspects, the second electrolyte comprises one or more inorganic salts. In some exemplary and unlimiting aspects, the second electrolyte can comprise a salt without the presence of the acid. Yet, in other aspects, the second electrolyte can comprise only an acid. In yet still further aspects, the second electrolyte can comprise the salt and the acid in any desired concentration. It is understood that the salt present in the second electrolyte can be at any concentration before its saturation. In certain aspects, the salt and the acid present in the electrolyte can have the same cation or a different cation. In yet other aspects, the combination of various salts (having the same cations but different anions or the same anions but different cations) can be present. Yet in still further aspects, the combination of the various acids can also be present in the second electrolyte.
In still further aspects, the one or more inorganic salt can comprise chlorides, sulfates, nitrates, phosphates, citrates, formates, lactates, tartrates, malates, fumarates, oxalates, succinates, gluconates, ascorbates, acetates of alkaline metals and/or alkaline-earth metals, or mixtures thereof.
It is understood that using hydrogen to generate hydrogen ions (either by looping the hydrogen from the first compartment to the second compartment or using both streams of hydrogen) improves the overall efficiency of the process. The hydrogen-depolarized reaction reduces both the energy cost and the electrode polarization in this electrolysis process. For example, in aspects where the pH gradient between the compartments is extreme (for example, pH=14 in the first compartment and pH=0 in the second compartment), the hydrogen-induced loop will only cost 0.83 V for the pH gradient, which is 60% more efficient than the typical salt splitting process. The half-reactions and their standard potential of anode (R4) and cathode (R3) are,
At pH=14, 2H2O−2e−→H2+2OH−φ=−0.83V vs. SHE (R3)
At pH=0, H2+2e−→2H+φ=0V vs. SHE (R4)
In one aspect, the second electrolyte solution 118 is in electrical and fluid communication with the anode. For example, the second electrolyte solution 118 is in electrical and fluid communication with the first surface 109 of the anode 110. In still further aspects, a pH of the second electrolyte solution is about −1.5≤pH≤8, including exemplary values of about −1.5, about −1, about −0.5, 0, about 0.5, about 1, about 1.5, about 2, about 2.5, about 3, about 3.5, about 4, about 4.5, about 5, about 5.5, about 6, about 6.5, about 7, about 7.5, and about 8. It is understood that at any point of, the second compartment can comprise the second electrolyte having a pH value that falls within any two foregoing values. In yet still further aspects, the pH of the second electrolyte can change during the unit operation. While in yet still further aspects, the pH of the second electrolyte is kept substantially the same during the unit operation, depending on the desired outcome. In still further aspects, the anode is configured to oxidate the hydrogen gas to generate hydrogen ions. In yet still further aspects, the second compartment comprises an outlet (not shown) configured to remove an acid solution comprising the generated hydrogen ions from the second compartment.
The unit 100 further comprises a third compartment 106 positioned between and in fluid communication with the first compartment 102 and the second compartment 104, wherein the third compartment 106 is separated from the first compartment 102 with one or more cation exchange membranes 112 and is separated from the second compartment 104 with one or more anion exchange membranes 114.
In still further aspects, the third compartment 106 comprises a fourth inlet (not shown) configured to receive a third flow of a third electrolyte solution 122. In such aspects, the third electrolyte solution 122, can have a pH of about 4→pH≤10, including exemplary values of about 4, about 4.5, about 5, about 5.5, about 6, about 6.5, about 7, about 7.5, about 8, about 8.5, about 9, about 9.5, and about 10. It is understood that at any point of, the third compartment can comprise the third electrolyte having a pH value that falls within any two foregoing values. In yet still further aspects, the pH of the third electrolyte can change during the unit operation. While in yet still further aspects, the pH of the third electrolyte is kept substantially the same during the unit operation, depending on the desired outcome. In still further aspects, the third compartment also can comprise an outlet configured (not shown) to remove the third electrolyte from the third compartment.
In still further aspects, the third electrolyte solution can comprise one or more inorganic salts. In still further aspects, the one or more inorganic salt comprises chlorides, sulfates, nitrates, phosphates, citrates, formates, lactates, tartrates, malates, fumarates, oxalates, succinates, gluconates, ascorbates, acetates of alkaline metals and/or alkaline-earth metals, or mixtures thereof. In yet still further aspects, the one or more inorganic salts in the third electrolyte can be referred to as brine.
In still further aspects, while the disclosed above inlets and outlets are not shown in
In still further aspects, the electro-synthesizer unit can be constructed by any known in the art methods. For example, and without limitations, each compartment can be any vessel configured to receive and retain disclosed above streams. In yet other aspects, the electro-synthesizer unit can comprise a plurality of plates positioned such that the disclosed above compartments are formed. For example and without limitations, each of the first, second and third compartments is defined by two or more plates. It is understood that all materials that are used to form the electro-synthesizer unit are chemically and physically compatible with the electrolytes used in the unit as well as output streams formed in the unit compartments.
In still further aspects, each of the compartments can have any width that can accommodate the desired flow rate of the described above streams. In some aspects, the first compartment can have a width of about 0.01 mm to about 500 mm, including exemplary values of about 0.05 mm, about 0.1 mm, about 0.5 mm, about 1 mm, about mm, about 10 mm, about 15 mm, about 20 mm, about 25 mm, about 50 mm, about mm, about 100 mm, about 125 mm, about 150 mm, about 175 mm, about 200 mm, about 250 mm, about 300 mm, about 350 mm, about 400 mm, and about 450 mm. It is understood that the first compartment can also have any width value that falls within any of the disclosed above values. For example, and without limitations, the width of the first compartment can be about 0.01 mm to about 50 mm, about 1 mm to about 10 mm, or about 5 mm to about 100 mm, and so on.
In aspects where the second compartment has the first and second channels, each channel can have any desired width that suits the streams' preferred flow rates. For example and without limitations, the first channel present in the second compartment has a width of about 0.01 to about 500 mm, including exemplary values of about 0.05 mm, about 0.1 mm, about 0.5 mm, about 1 mm, about 5 mm, about 10 mm, about 15 mm, about 20 mm, about 25 mm, about 50 mm, about 75 mm, about 100 mm, about 125 mm, about 150 mm, about 175 mm, about 200 mm, about 250 mm, about 300 mm, about 350 mm, about 400 mm, and about 450 mm. It is understood that the first channel can also have any width value that falls within any of the disclosed above values. For example, and without limitations, the width of the first channel can be about 0.01 mm to about 50 mm, or about 1 mm to about 10 mm, or about 5 mm to about 100 mm, and so on. In further aspects, the second channel present in the second compartment has a width of about 0.01 to about 500 mm, including exemplary values of about 0.05 mm, about 0.1 mm, about 0.5 mm, about 1 mm, about 5 mm, about 10 mm, about 15 mm, about 20 mm, about 25 mm, about 50 mm, about 75 mm, about 100 mm, about 125 mm, about 150 mm, about 175 mm, about 200 mm, about 250 mm, about 300 mm, about 350 mm, about 400 mm, and about 450 mm. It is understood that the second channel can also have any width value that falls within any of the disclosed above values. For example, and without limitations, the width of the second channel can be about 0.01 mm to about 50 mm, or about 1 mm to about 10 mm, or about 5 mm to about 100 mm, and so on.
In still further aspects, the third compartment can have a width of about 0.01 to about 500 mm, including exemplary values of about 0.05 mm, about 0.1 mm, about mm, about 1 mm, about 5 mm, about 10 mm, about 15 mm, about 20 mm, about mm, about 50 mm, about 75 mm, about 100 mm, about 125 mm, about 150 mm, about 175 mm, about 200 mm, about 250 mm, about 300 mm, about 350 mm, about 400 mm, and about 450 mm. It is understood that the third compartment can also have any width value that falls within any of the disclosed above values. For example, and without limitations, the width of the third compartment can be about 0.01 mm to about mm, or about 1 mm to about 10 mm, or about 5 mm to about 100 mm, and so on.
In still further aspects, all compartments can have the same width, while in other aspects, some of the compartments can have the same width, and some of them can have a different width. It is understood that the desired flow rate and coulombic efficiency of the cell can determine the width of the compartment. In yet still further aspects, the width of the compartment can be changed in the cell by introducing (or removing) additional plates, gaskets, membranes, and the like.
In still further aspects, each of the cathode and anode are electrically connected to a power source. In still further aspects, the power source can provide a desired current to achieve the electrochemical reaction to produce the hydroxide ions and hydrogen in the first compartment and the hydrogen ions in the second compartment at desired efficiencies. In certain aspects, the current can have a current density from about 50 mAh/cm2 to about 500 mAh/cm2, including exemplary values of about 75 mAh/cm2, about 100 mAh/cm2, about 125 mAh/cm2, about 150 mAh/cm2, about 175 mAh/cm2, about 200 mAh/cm2, about 225 mAh/cm2, about 250 mAh/cm2, about 275 mAh/cm2, about 300 mAh/cm2, about 325 mAh/cm2, about 350 mAh/cm2, about 375 mAh/cm2, about 400 mAh/cm2, about 425 mAh/cm2, about 450 mAh/cm2, and about 475 mAh/cm2. In yet still further aspects, the current density can have any value between any two foregoing values. In still further aspects, the power source is configured to provide a desired voltage between the cathode and anode material. In such aspects, the provided voltage can be from about 0.5 V to about 10 V, including exemplary values of about 1 V, about 1.5 V, about 2 V, about 2.5 V, about 3 V, about 3.5 V, about 4 V, about 4.5 V, about 5 V, about 5.5 V, about 6 V, about 6.5 V, about 7 V, about 7.5 V, about 8 V, about 8.5 V, about 9 V, and about 9.5 V. It is understood that any voltage having a value between any two foregoing values can be used to achieve the desired outcome.
In still further aspects, any known in the art cathode and anode materials can be used in the disclosed unit. For example, the cathode can comprise a Pt group metal or their alloys based electrode, a Ni— and its alloys-based electrode, a NiFe-based electrode, a NiTi-based electrode, a steel-based electrode, transition metal sulfates-based electrode, such as for example, and without limitations, molybdenum sulfide, tungsten sulfide, transition metal phosphide-based electrode, for example, and without limitations cobalt phosphide, Fe-based catalysts, carbon-based materials, or any combination thereof. In still further aspects, any cathode materials capable of inducing an electrochemical generation of hydrogen can be used.
In still further aspects, any anodes known in the art and suitable for the desired operation can be utilized. In certain aspects, the anode can comprise a gas diffusion layer. Yet in further aspects, the anode further comprises a hydrogen oxidation catalyst layer. It is understood that the gas diffusion layer assists with maintaining a stable gas-liquid interface. It is further understood that other configurations capable of maintaining a stable gas-liquid interface other than the disclosed herein gas diffusion layer can be used. For example, the stable gas-liquid interface can be formed by continuous bubbling of the gas through the second channel of the second compartment.
In certain aspects, the gas diffusion layer comprises a carbon-based gas diffusion layer, a fluorocarbon-based gas diffusion layer, a hydrophobic material comprising a plurality of pores, or any combination thereof. It is understood that any hydrophobic material can be utilized. In certain aspects, the layer can be made from the materials that are not inherently hydrophobic but can comprise a hydrophobic coating that provides the desired utility. In certain aspects, the gas diffusion layer comprises a carbon-based paper, a carbon-based textile, a modified carbon-based paper, a modified carbon-based textile, micro-porous PTFE membrane, mesoporous PTFE membrane, macro-porous PTFE membrane, or a combination thereof. It is understood that the term “modified” as used herein refers to the disposed desired coatings on the surfaces or any other modification of the surfaces to introduce the desired surface properties. For example, the surface can be chemically, electrochemically, physically, and/or plasma modified to increase roughness, introduce the desired chemical moieties, and the like.
In still further aspects, the hydrogen oxidation catalyst layer comprises one or more Pt group metal (PGM) or alloys thereof-based catalysts, PGM-free catalysts, and any combination thereof. In still further exemplary and unlimiting aspects, the hydrogen oxidation catalyst layer comprises one or more of Pt/C, Pd and its alloys, Au and its alloys, Ru and its alloys, transition metal oxides and their alloys, transition metal carbides and nitrides, metal-organic frameworks, carbon-supported metal atoms, hydrogenase, hydrogenase mimic compounds, hydrogenase, or any combinations thereof.
In still further aspects, to collect the current through both electrodes, current collectors are used for both anode and cathode. In some aspects, the current collector can be presented as a bipolar plate, or a wire, or a plate, or any combination thereof. For example and without limitations, the current collector/bipolar plates can be made of graphite (plain or porous), titanium, gold or gold-coated metal plates, etc.
It is also understood that any known in the art cation exchange membranes and anion exchange membranes can be used. In such aspects, any known and commercially available cation exchange membranes and anion exchange membranes can be used.
In certain aspects, the polymeric cation-exchange membranes comprise —SO3−, —COO−, —PO32−, —PO3H−, or —C6H4O− cation exchange functional groups. The polymers for the preparation of cation-exchange membranes can be perfluorinated ionomers such as NAFION (a perfluorosulfonic-based membrane), FLEMION, and NEOSEPTA-F, partially fluorinated polymers, non-fluorinated hydrocarbon polymers, non-fluorinated polymers with aromatic backbone, or acid-base blends. It will be appreciated that in some aspects, depending on the need to restrict or allow migration of a specific cation or an anion species between the electrolytes, a cation exchange membrane that is more restrictive and thus allows migration of one species of cations while restricting the migration of another species of cations may be used as, e.g., a cation exchange membrane that allows migration of potassium ions into the cathode electrolyte while restricting migration of other cations into the cathode electrolyte, may be used. Such restrictive cation exchange membranes are commercially available and can be selected by one ordinarily skilled in the art. Some exemplary and commercially available membranes, such as Nafion®N117, CMI-7000, CMH-PP Flalex, EMION PF1-HLF8-15-X, CEM-Type I and CEM-Type II, etc., can be used.
Anion exchange membranes (AEM) are conventionally known in the art. In some aspects, the polymeric anion-exchange membranes comprise —NH3+, —NRH2++, —NR2H+, —NR3+, or —SR2− anion exchange functional groups. The polymers for the preparation of anion-exchange membranes can be perfluorinated ionomers such as NAFION (a perfluorosulfonic-based membrane), FLEMION, and NEOSEPTA-F, partially fluorinated polymers, non-fluorinated hydrocarbon polymers, non-fluorinated polymers with aromatic backbone, or acid-base blends. It will be appreciated that in some aspects, depending on the need to restrict or allow migration of a specific cation or an anion species between the electrolytes, an anion exchange membrane that is more restrictive and thus allows migration of one species of anions while restricting the migration of another species of anions may be used as, e.g., an anion exchange membrane that allows migration of chloride ions into the anode electrolyte while restricting migration of other anions into the anode electrolyte, may be used. Such restrictive anion exchange membranes are commercially available and can be selected by one ordinarily skilled in the art. In still further aspects, any known and commercially available anion exchange membranes can be used. For example, and without limitations, Sustainion® 37-50, Nafion® 115, PiperION TP-85, Fumasep FAPQ-375, PBI, Neosepta ACN, etc, hi certain aspects, the unit can comprise one or more of cation exchange membranes and/or anion exchange membranes. In still further aspects, the cation and anion exchange membranes can be unsupported, While in other aspects, the cation and anion exchange membranes can be supported or reinforced. For example, the cation and/or anion exchange membranes can be polymer reinforced. In such aspects, the polymers that are used for reinforcement are inert to the first, second, and/or third electrolyte solutions present in the disclosed units. In still further aspects, the cation and/or anion exchange membranes can be PTFE-reinforced, PEEK reinforced, or any combination thereof.
In still further aspects, the cation and anion exchange membranes can have any desired thickness. In some aspects, the thickness of the membranes can be about μm to about 450 μm, including exemplary values of about 20 μm, about 30 μm, about 40 μm, about 50 μm, about 60 μm, about 70 μm, about 80 μm, about 90 μm, about 100 μm, about 150 μm, about 200 μm, about 250 μm, about 300 μm, about 350 μm, and about 400 μm.
In still further aspects, the flow of the first electrolyte, the second electrolyte, and/or the third electrolyte can be the same or different and can be determined based on the specific application. In certain aspects, the first electrolyte, the second electrolyte, and/or the third electrolyte can have a flow rate from about 1 to about mL/h, including exemplary values of about 50 mL/h, about 100 mL/h, about 200 mL/h, about 300 mL/h, about 400 mL/h, about 500 mL/h, about 600 mL/h, about 700 mL/h, about 800 mL/h, about 900 mL/h, about 1,000 mL/h, about 5,000 mL/h, about 10,000 mL/h, about 50,000 mL/h, about 100,000 mL/h, about 250,000 mL/h, about 500,000 mL/h, about 750,000 mL/h, about 1,000,000 mL/h, about 2,000,000 mL/h, about 3,000,000 mL/h, and about 4,000,000 mL/h. It is also understood that the flow rate can have any value between any two foregoing values.
In still further aspects, the electro-synthesizer unit disclosed herein can produce the acid solution and the base solution at any desired pH. For example, the unit disclosed herein can produce the acid and base solutions at low concentrations. For example, when the pH in the first compartment is about 8 to about 14.5, including exemplary values of about 8.5, about 9, about 9.5, about 10, about 10.5, about 11, about 11.5, about 12, about 12.5, about 13, about 13.5, and about 14, and wherein the pH in the second compartment is about −0.5 to about 6, including exemplary values of about 0.5, about 1, about 1.5, about 2, about 2.5, about 3, about 3.5, about 4, about 4.5, about 5, and about 5.5, the base solution removed from the one or more outlets of the first compartment and the acid solution removed from the outlet of the second compartment has a molarity of greater than 0 to less than about 3 M, including exemplary values of about 0.001 M, about 0.005 M, about 0.01 M, about 0.05 M, about M, about 0.5 M, about 1 M, about 1.5 M, about 2 M, and about 2.5. It is understood that these values are only exemplary, and the base solution and acid solution can be present in a concentration having any values between any two foregoing values. Similarly, the first and second compartments can have pH values falling between any two foregoing values. It is further understood that in some aspects, the generated acid solution and the generated base solution can have substantially the same concentration. While in other aspects, the generated acid solution and the generated base solution can have a different concentrations falling with the disclosed values.
In further aspects, when the pH in the first compartment is about 8 to about including exemplary values of about 8.5, about 9, about 9.5, about 10, about about 11, about 11.5, about 12, about 12.5, about 13, about 13.5, about 14, about 14.5, and about 15, and wherein the pH in the second compartment is about 1 to about 6, including exemplary values of about 1.5, about 2, about 2.5, about 3, about 3.5, about 4, about 4.5, about 5, and about 5.5, the base solution removed from the one or more outlets of the first compartment has a molarity of greater than 0 to about M, including exemplary values of about 0.001 M, about 0.005 M, about 0.01 M, about 0.05 M, about 0.1 M, about 0.5 M, about 1 M, about 2 M, about 3 M, about 4 M, about 5 M, about 6 M, about 7 M, about 8 M, about 9 M, about 10 M, about 12 M, about 13 M, about 14 M, about 15 M, about 16 M, about 17 M, about 18 M, and about 19 M. It is understood that these values are only exemplary, and the base solution can be present in a concentration having any values between any two foregoing values.
In further aspects, when the pH in the first compartment is about 8 to about including exemplary values of about 8.5, about 9, about 9.5, about 10, about 10.5, about 11, about 11.5, about 12, about 12.5, about 13, about 13.5, about 14, about 14.5, and about 15, and wherein the pH in the second compartment is about 1 to less than about 6, about 1.5, about 2, about 2.5, about 3, about 3.5, about 4, about 4.5, about 5, and about 5.5, the acid solution removed from the outlet of the second compartment has a molarity of greater than 0 to about 10 M, including exemplary values of about 0.001 M, about 0.005 M, about 0.01 M, about 0.05 M, about 0.1 M, about 0.5 M, about 1 M, about 2 M, about 3 M, about 4 M, about 5 M, about 6 M, about 7 M, about 8 M, and about 9 M. It is understood that these values are only exemplary, and the acid solution can be present in a concentration having any values between any two foregoing values.
Similarly, the first and second compartments can have pH values falling between any two foregoing values. It is further understood that in some aspects, the generated acid solution and the generated base solution can have substantially the same concentration. While in other aspects, the generated acid solution and the generated base solution can have a different concentrations falling with the disclosed values.
In still further aspects, the electro-synthesizer unit is a recirculated-in-a-loop system. In still further aspects, the electro-synthesizer unit can be connected to one or more pumps. It is understood that in some aspects, the desired flow of the electrolytes and other streams can be provided by any means known in the art. In some aspects, one or more pumps are used to deliver the desired stream. While in other aspects, pumps are not used. It is understood that any known in the art pumps can be utilized.
In still further aspects, if desired the disclosed herein one or more electro-synthesizer units can be driven by different cathodic and anodic reactions including but not limited to hydrogen oxidation reaction (HOR), hydrogen evolution reaction (HER), oxygen evolution reaction (OER), oxygen reduction reaction (ORR).
In still further aspects, the disclosed herein electro-synthesizer unit can be in communication with a controller. The controller can comprise a processor that allows control of the desired process. In some aspects, the controller is a feedback loop base controller designed to adjust processing conditions based on an output. In still further aspects, the power source used to operate the disclosed herein electro-synthesizer unit can be a conventional grid power source, a renewable power source or any combination thereof. In still further aspects, it is understood that the one or more flow electro-synthesizer units generate the acid solution and the base solution in a batch or a continuous operation. In yet still further aspects, the one or more flow electro-synthesizer units generate the acid solution and the base solution utilizing an energy source configured to operate continuously or on demand. For example, in some aspects, the flow electro-synthesizer units can utilize off-peak periods when the energy is cheap. In such exemplary and unlimiting aspects, the flow electro-synthesizer units can be stopped when energy is expensive and operate only when energy is cheap. In certain aspects, the generated acids/bases can be utilized immediately. While in other aspects, the generated acids/bases can be collected for further desired applications.
In still further aspects, the electro-synthesizer unit disclosed herein has a coulombic efficiency of greater than about 80%, about 85%, about 90%, about 95%, and 100%. In still other aspects, the electro-synthesizer unit disclosed herein exhibits a coulombic efficiency of substantially 100%.
Also disclosed herein are systems comprising one or more of the electro-synthesizer units disclosed herein. The exemplary system 200 is shown in
In still further aspects, the system can comprise from 1 to about 1000, including exemplary values of 2, 3, 5, 10, 15, 20, 30, 50, 100, 250, 500, and 750 of electro-synthesizer units. It is understood that there is actually no limit to the number of electro-synthesizer units present in the system. For example and without limitations for a 100 cm2 electro-synthesizer (total effective area=2500 cm2), one can utilize 25-electro-synthesizer units. In other exemplary and unlimiting aspects, for a 400 cm2 electro-synthesizer (total effective area=16000 cm2), one can utilize 40-electro-synthesizer units.
Also disclosed herein are methods of producing acid and base solutions. The methods disclosed herein comprise providing the electro-synthesizer unit of any examples herein or the system of any examples herein; flowing the first electrolyte, the second electrolyte, and the third electrolyte; generating a hydrogen gas stream and a hydroxide on the cathode in the first compartment; generating hydrogen ions on the anode in the second compartment; directing a stream comprising a hydrogen gas into the second compartment; wherein the hydrogen gas present in the stream is the generated hydrogen gas and/or a hydrogen gas provided from an external source; collecting a generated base solution and a generated acid solution. The generated base solution and/or generated acid solution can have any concentration disclosed above. In certain aspects, when the formed acid solution or base solution is used as the first and the second electrolyte solution, these acid and base solutions can be diluted to arrive at any desired pH for the first and the second electrolyte.
Exemplary systems of operation are shown in
A hydrogen gas produced in the first compartment can also be removed from the first compartment using line 320. In some aspects, the hydrogen gas can be removed by a separate line (not shown). In certain aspects, the generated hydrogen gas can be moved to reservoir 302, separated from the base solution, and delivered to hydrogen reservoir 310. In certain aspects, the generated hydrogen can be moved out of the first compartment by a separate line and directly communicated to the hydrogen reservoir (not shown). Hydrogen from the hydrogen reservoir can be delivered by line 328 to the second channel 120 of the second compartment and recirculated back by line 326 to hydrogen reservoir 310. In still further aspects, the acid solution formed in the second compartment is delivered with line 330 to an acid reservoir 306.
At least a portion of the generated acid solution can be removed by line 318. The remaining portion of the acid solution can be diluted with water by line 316. The diluted acid solution can then be recirculated into the first channel 118 of the second compartment with lines 322 and 334 using an optional pump 308. It is understood that since the electro-synthesizer unit is a flow unit, the third electrolyte in the third compartment continuously flows through the system (not shown).
The generated base solution is removed from the first compartment by line 420 and delivered to a base reservoir 402. A generated hydrogen gas is removed from the reservoir by line 415, and at least a portion of the generated base is removed by line 414. The remaining portion of the generated base is diluted by line 412 and delivered back to the first compartment as the first electrolyte by lines 422 and 423 using an optional pump 404.
By way of a non-limiting illustration, examples of certain aspects of the present disclosure are given below.
The following examples are put forth so as to provide those of ordinary skill in the art with a complete disclosure and description of how the compounds, compositions, articles, devices, and/or methods claimed herein are made and evaluated and are intended to be purely exemplary and are not intended to limit the disclosure. Efforts have been made to ensure accuracy with respect to numbers (e.g., amounts, temperature, etc.), but some errors and deviations should be accounted for. Unless indicated otherwise, parts are parts by weight, temperature is degrees C. or is at ambient temperature, and pressure is at or near atmospheric.
The devices, systems, and methods of the appended claims are not limited in scope by the specific devices, systems, and methods described herein, which are intended as illustrations of a few aspects of the claims. Any devices, systems, and functionally equivalent methods are intended to fall within the scope of the claims. Various modifications of the devices, systems, and methods, in addition to those shown and described herein, are intended to fall within the scope of the appended claims. Further, while only certain representative devices, systems, and method steps disclosed herein are specifically described, other combinations of the devices, systems, and method steps also are intended to fall within the scope of the appended claims, even if not specifically recited. Thus, a combination of steps, elements, components, or constituents may be explicitly mentioned herein or less; however, other combinations of steps, elements, components, and constituents are included, even though not explicitly stated.
Although several embodiments of the invention have been disclosed in the foregoing specification, it is understood by those skilled in the art that many modifications and other embodiments of the invention will come to mind to which the invention pertains, having the benefit of the teaching presented in the foregoing description and associated drawings. It is thus understood that the invention is not limited to the specific embodiments disclosed hereinabove and that many modifications and other embodiments are intended to be included within the scope of the appended claims. Moreover, although specific terms are employed herein, as well as in the claims which follow, they are used only in a generic and descriptive sense and not for the purposes of limiting the described invention or the claims which follow.
Unless defined otherwise, all technical and scientific terms used herein have the same meanings as commonly understood by one of skill in the art to which the disclosed invention belongs. Publications cited herein and the materials for which they are cited are specifically incorporated by reference.
The claims are not intended to include, and should not be interpreted to include, means-plus- or step-plus-function limitations unless such a limitation is explicitly recited in a given claim using the phrase(s) “means for” or “step for,” respectively.
In view of the described processes and compositions, hereinbelow are described certain more particularly described aspects of the inventions. These particularly recited aspects should not, however, be interpreted to have any limiting effect on any different claims containing different or more general teachings described herein or that the “particular” aspects are somehow limited in some way other than the inherent meanings of the language and formulas literally used therein.
In view of the described processes and compositions, hereinbelow are described certain more particularly described aspects of the disclosures. These particularly recited aspects should not, however, be interpreted to have any limiting effect on any different claims containing different or more general teachings described herein, or that the “particular” aspects are somehow limited in some way other than the inherent meanings of the language and formulas literally used therein.
Example 1. An electro-synthesizer unit, wherein the electro-synthesizer unit is a flow unit comprising: a first compartment comprising: a first inlet configured to receive a first flow of a first electrolyte solution; a cathode; the first electrolyte solution that is in electrical and fluid communication with the cathode; wherein a pH of the first electrolyte solution is about 6≤pH≤15.5; wherein the cathode is configured to generate a hydrogen gas and a hydroxide; one or more outlets configured to remove the generated hydrogen gas and/or a base solution comprising the generated hydroxide from the first compartment; a second compartment comprising: a second inlet configured to receive a second flow of a second electrolyte solution, a third inlet configured to receive a stream comprising a hydrogen gas, an anode; and the second electrolyte solution that is in electrical and fluid communication with the anode; wherein a pH of the second electrolyte solution is about −1.5≤pH≤8; wherein the anode is configured to oxidate the hydrogen gas to generate hydrogen ions; an outlet configured to remove an acid solution comprising the generated hydrogen ions from the second compartment; and a third compartment positioned between and in fluid communication with the first compartment and the second compartment, wherein the third compartment is separated from the first compartment with one or more cation exchange membranes and is separated from the second compartment with one or more anion exchange membranes; wherein the third compartment comprises: a fourth inlet configured to receive a third flow of a third electrolyte solution, the third electrolyte solution, wherein a pH of the third electrolyte solution is about 4≤pH≤10; and an outlet configured to remove the third electrolyte from the third compartment.
Example 2. The electro-synthesizer unit of any examples herein, particularly example 1, wherein the stream comprises the hydrogen gas generated in the first compartment.
Example 3. The electro-synthesizer unit of any examples herein, particularly example 2, wherein the stream comprising the generated hydrogen gas is directly fed from the first compartment to the second compartment.
Example 4. The electro-synthesizer unit of any examples herein, particularly example 1, wherein the stream comprises a hydrogen gas supplied from an external source.
Example 5. The electro-synthesizer unit of any examples herein, particularly examples 1-4, wherein each of the first, second and third compartments are defined by two or more plates.
Example 6. The electro-synthesizer unit of any examples herein, particularly examples 1-5, wherein the second inlet of the second compartment extends into a first channel and the third inlet extends into a second channel.
Example 7. The electro-synthesizer unit of any examples herein, particularly example 6, wherein the first channel is positioned between the anion exchange membrane and a first surface of the anode.
Example 8. The electro-synthesizer unit of any examples herein, particularly example 6 or 7, wherein the second channel is positioned abut a second surface of the anode.
Example 9. The electro-synthesizer unit of any examples herein, particularly examples 1-8, wherein the electro-synthesizer unit is a recirculated-in-a-loop system.
Example 10. The electro-synthesizer unit of any examples herein, particularly examples 1-9, wherein the generated in the first compartment hydrogen gas and the base solution comprising the generated hydroxide is removed from the same outlet.
Example 11. The electro-synthesizer unit of any examples herein, particularly examples 1-10, wherein the first compartment comprises two or more outlets, wherein the generated hydrogen gas stream and the base solution comprising the generated hydroxide are removed from separate outlets.
Example 12. The electro-synthesizer unit of any examples herein, particularly examples 1-11, wherein the third compartment has a width of about 0.01 to about 500 mm.
Example 13. The electro-synthesizer unit of any examples herein, particularly examples 1-12, wherein the first compartment has a width of about 0.01 to about 500 mm.
Example 14. The electro-synthesizer unit of any examples herein, particularly examples 6-13, wherein the first channel present in the second compartment has a width of about 0.01 to about 500 mm.
Example 15. The electro-synthesizer unit of any examples herein, particularly examples 6-14, wherein the second channel present in the second compartment has a width of about 0.01 to about 500 mm.
Example 16. The electro-synthesizer unit of any examples herein, particularly examples 1-15, wherein the anode comprises a gas diffusion layer.
Example 17. The electro-synthesizer unit of any examples herein, particularly example 16, wherein the anode further comprises a hydrogen oxidation catalyst layer.
Example 18. The electro-synthesizer unit of any examples herein, particularly example 16 or 17, wherein the gas diffusion layer comprises a carbon-based gas diffusion layer, a fluorocarbon-based gas diffusion layer, a hydrophobic material comprising a plurality of pores, or any combination thereof.
Example 19. The electro-synthesizer unit of any examples herein, particularly example 18, wherein the gas diffusion layer comprises a carbon-based paper, a carbon-based textile, a modified carbon-based paper, a modified carbon-based textile, micro-porous PTFE membrane, mesoporous PTFE membrane, macro-porous PTFE membrane, or a combination thereof.
Example 20. The electro-synthesizer unit of any examples herein, particularly example 17-19, wherein the hydrogen oxidation catalyst layer comprises one or more Pt group metal (PGM) or alloys thereof-based catalysts, PGM-free catalysts, and any combination thereof.
Example 21. The electro-synthesizer unit of any examples herein, particularly example 20, wherein the hydrogen oxidation catalyst layer comprises one or more of Pt/C, Pd and its alloys, Au and its alloys, Ru and its alloys, transition metal oxides and their alloys, transition metal carbides and nitrides, metal-organic frameworks, carbon-supported metal atoms, hydrogenase, hydrogenase mimic compounds, hydrogenase, or any combinations thereof.
Example 22. The electro-synthesizer unit of any examples herein, particularly examples 1-21, wherein the cathode comprises a Pt group metal or their alloys based electrode, a Ni— and its alloys-based electrode, a NiFe-based electrode, NiTi-based electrode, steel-based electrode, transition metal sulfates-based electrode (like molybdenum sulfide, tungsten sulfide), transition metal phosphide-based electrode (like cobalt phosphide), Fe-based catalysts, carbon-based materials, or any combination thereof.
Example 23. The electro-synthesizer unit of any examples herein, particularly examples 1-22, wherein the cation and/or anion exchange membranes are polymer reinforced, wherein the polymer is inert to the first, second, and/or third electrolyte solutions.
Example 24. The electro-synthesizer unit of any examples herein, particularly example 23, wherein the cation and/or anion exchange membranes are PTFE-reinforced, PEEK reinforced, or any combination thereof.
Example 25. The electro-synthesizer unit of any examples herein, particularly examples 1-24, wherein the third electrolyte solution comprises one or more inorganic salts.
Example 26. The electro-synthesizer unit of any examples herein, particularly example 25, wherein the one or more inorganic salt comprises chlorides, sulfates, nitrates, phosphates, citrates, formates, lactates, tartrates, malates, fumarates, oxalates, succinates, gluconates, ascorbates, acetates of alkaline metals and/or alkaline-earth metals, or mixtures thereof.
Example 27. The electro-synthesizer unit of any examples herein, particularly examples 1-26, wherein the first electrolyte solution comprises a base.
Example 28. The electro-synthesizer unit of any examples herein, particularly example 27, wherein the base comprises one or more of sodium hydroxide, lithium hydroxide, potassium hydroxide, magnesium hydroxide, calcium hydroxide, ammonium hydroxide, amine-based bases, sodium acetate, or any combination thereof.
Example 29. The electro-synthesizer unit of any examples herein, particularly examples 1-28, wherein the second electrolyte solution comprises an acid.
Example 30. The electro-synthesizer unit of any examples herein, particularly example 28 or 29, wherein the acid comprises one or more of hydrochloric acid, hydrobromic acid, hydroiodic acid, sulfurous acid, sulfuric acid, nitric acid, phosphorous acid, phosphoric acid, hypochlorous acid, chlorous acid, chloric acid, perchloric acid, formic acid, acetic acid, carbonic acid, or any combination thereof.
Example 31. The electro-synthesizer unit of any examples herein, particularly examples 27-30, wherein the first electrolyte comprises one or more inorganic salts.
Example 32. The electro-synthesizer unit of any examples herein, particularly examples 29-31, wherein the second electrolyte comprises one or more inorganic salts.
Example 33. The electro-synthesizer unit of any examples herein, particularly example 31-32, wherein the one or more inorganic salt comprises chlorides, sulfates, nitrates, phosphates, citrates, formates, lactates, tartrates, malates, fumarates, oxalates, succinates, gluconates, ascorbates, acetates of alkaline metals and/or alkaline-earth metals, or mixtures thereof.
Example 34. The electro-synthesizer unit of any examples herein, particularly examples 1-33, wherein the flow of the first electrolyte, the second electrolyte, and/or the third electrolyte is the same or different.
Example 35. The electro-synthesizer unit of any examples herein, particularly example 34, wherein a flow rate is from about 1 to about 5,000,000 mL/h.
Example 36. The electro-synthesizer unit of any examples herein, particularly examples 1-35, wherein when the pH in the first compartment is about 8 to about 14.5, and wherein the pH in the second compartment is about −0.5 to about 6, the base solution removed from the one or more outlets of the first compartment and the acid solution removed from the outlet of the second compartment has a molarity of greater than 0 to less than about 3 M.
Example 37. The electro-synthesizer unit of any examples herein, particularly examples 1-36, wherein when the pH in the first compartment is about 8 to about 15.5, and wherein the pH in the second compartment is about 1 to about 6, the base solution removed from the one or more outlets of the first compartment has a molarity of greater than 0 to about 20 M.
Example 38. The electro-synthesizer unit of any examples herein, particularly examples 1-35 or 37, wherein when the pH in the first compartment is about 8 to about 15.5, and wherein the pH in the second compartment is about 1 to less than about 6, the acid solution removed from the outlet of the second compartment has a molarity of greater than 0 to about 10 M.
Example 39. A system comprising one or more of the electro-synthesizer units of any examples herein, particularly examples 1-38.
Example 40. The system of any examples herein, particularly example 39, wherein two or more electro-synthesizer units are present, and two or more electro-synthesizer units are designed to share a cathode.
Example 41. The system of any examples herein, particularly example 39 or 40, wherein three or more electro-synthesizer units are present and wherein the three or more electro-synthesizer units are configured to share the second channel of the second compartment.
Example 42. The system of any examples herein, particularly examples 39-41, wherein the system comprises from 1 to about 1000 of electro-synthesizer units.
Example 43. A method comprising: providing the electro-synthesizer unit of any examples herein, particularly examples 1-38 or the system of any examples herein, particularly examples 39-42; flowing the first electrolyte, the second electrolyte, and the third electrolyte; generating a hydrogen gas stream and a hydroxide on the cathode in the first compartment; generating hydrogen ions on the anode in the second compartment; directing a stream comprising a hydrogen gas into the second compartment; wherein the hydrogen gas present in the stream is the generated hydrogen gas and/or a hydrogen gas provided from an external source; collecting a generated base solution and a generated acid solution.
Example 44. The method of any examples herein, particularly example 43, wherein the electro-synthesizer unit operates as a recirculated-in-a-loop system.
Example 45. The method of any examples herein, particularly example 43 or 44, wherein the generated base and acid solutions have a molarity from greater than 0 to about 3 M.
Example 46. The method of any examples herein, particularly examples 43-45, wherein the generated base solution has a molarity greater than 0 to about 20 M, and the acid solution has a molarity greater than 0 to about 10 M.
Example 47. The method of any examples herein, particularly example 46, wherein at least a portion of the collected generated base and acid solution is diluted and used as the first and the second electrolyte solution, respectively.
This application claims the benefit of U.S. Provisional Application No. 63/369,699, filed Jul. 28, 2022, and U.S. Provisional Application No. 63/375,088, filed Sep. 9, 2022, the contents of which are incorporated herein by reference in their entirety.
| Number | Date | Country | |
|---|---|---|---|
| 63369699 | Jul 2022 | US | |
| 63375088 | Sep 2022 | US |
