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1. Field of the Invention
The present invention relates to a reactive process for obtaining barium sulfate and calcium chloride.
2. Description of Related Art Including Information Disclosed Under 37 CFR 1.97 and 37 CFR 1.98
The present invention provides a reactive process for separating from B355 (barium sulfate and calcium carbonate), as the result of the flotation process. Noncommercial hydrochloric acid is used (24% to 27% concentration). The reaction of B355 and hydrochloric acid results in calcium chloride and barium sulfate with a higher degree of purity and higher density. The process used for the two elements used prevents their confinement, due to the result of their transformation in the processes to which they are subjected.
U.S. Pat. No. 5,262,148: Process for preparing barium sulfate. Barium sulfate having a specific crystal structure and optical characteristics is disclosed. The crystals have a plate-like structure of which the aspect ratio is 5-100 and the ratio of the square of the circumference of the plate and the area of the orthogonal projection plane is 20:1-150:1. In a preferred embodiment, a thin film of 25 μm thickness with 20% by weight of the barium sulfate powder concentration has a scattering transmittance of 70% or greater and a total transmittance of 85% or greater. The cosmetic compositions to which the barium sulfate is incorporated exhibits excellent extendibility and adhesion to the skin and can effectively hide the spots or freckles on the skin. The cosmetic composition satisfies both the fine naked skin feeling and the skin covering effect, which have never been satisfied by conventional cosmetic compositions.
The reaction of B355 and hydrochloric acid results in calcium chloride and barium sulfate with a higher degree of purity and higher density.
Table 1: Obtaining 4.40 g/m3 Barium Sulfate. Table 1 details the necessary amounts of the elements for obtaining barium sulphate according to each stage of the process object of this invention.
Table 2: Testing 4.40 g/m3 of Barium Sulfate. Table 2 shows results of analyses performed under the following parameters: NMX-L-159-SCFI-2003, API Specification 13A (SPEC 13A) and API RP 131.
The reactive process to obtain synthetic barium sulphate allows as much as 98% purity of the same with a density 4.40 g/m3, and calcium chloride (CaCl2) is also obtained at 24% concentration. It uses the following ingredients with the corresponding purity or concentration:
The process for obtaining synthetic barium sulfate and calcium chloride, object of the present invention comprises the following stages which occur within a reactor preferably made of fiberglass as described below:
(a) React B355 (barium sulfate and calcium carbonate) with noncommercial hydrochloric acid to elevate the purity of barium sulfate as a primary compound and obtain calcium chloride as a stock solution.
B355 25% to 80%, preferably at 40% w/v, is reacted with hydrochloric acid 10% to 80%, preferably at 60% v/v, for a period of 10 min to 60 min in a reactor, to obtain a stock solution containing calcium chloride with 24% concentration and barium sulfate free of calcium carbonate at 32.88% concentration, with a pH of 3 in the stock solution as shown in formula 1.
B355 (BaSO4+CaCO3)+2HCl BaSO4+CaCl2 Formula 1
(b) Filter the stock solution obtained in step a) through a press filter to obtain Calcium Chloride at 24% concentration and Barium Sulfate at 67.12% purity.
The stock solution is passed through the press filter preferably horn 14.15 L to 8,500 L per hour, calcium chloride at 24% and barium sulfate at 48% purity, the primary compound.
(c) The primary compound is rinsed in the reactor to remove traces of noncommercial hydrochloric acid from the compound of step (b).
The primary compound is rinsed, with ordinary water as necessary to remove the remaining noncommercial hydrochloric acid and it is allowed to remain in water for a period 5 to 60 min, preferably 30 min, water is released from the reactor, to obtain the parent compound, as shown in Formula 2.
(d) Return to the reactor the stock solution obtained by filtration in the press filter in step (b).
The stock solution is returned to the reactor, which contains the primary compound rinsed in step (c), as shown in formula 3.
CaCl2+BaSO4 Formula 3
(e) Add sodium carbonate and water to the reactor, to make them react with the components of step (d) to obtain Barium Sulphate with a degree of purity of 67.12% and a density of 3.00 g/m3, and Calcium Chloride at 24% purity with a pH greater than or equal to 7.0.
The primary component at 10% to 45%, preferably 26.52% w/v, and the stock solution at 15% to 70%, preferably 39.79% v/v, are added to the reactor. Sodium carbonate 0.10% to 1%, preferably 0.53% v/v, which is 60% to 98% pure, preferably 98%, water is added at 13% to 45%, preferably 33.16% v/v, and the mixture is allowed to rest for a period of 5 min to 90 min, preferably 30 min; until the primary solution has a pH greater than or equal to 7.0 and the primary compound increases its purity up to 98% at a density 4.40 g/m3, as a result of the reaction with sodium carbonate at 98%. The reaction produces carbon dioxide, which is recovered and stored, as shown in Formula 4.
BaSO4+CaCl2+H2O+NaCO3═CO2 Formula 4
(f) Filter the stock solution in a press filter and remove the primary component, the components of step (e) to obtain Barium Sulphate with a purity of 98% and 4.40 g/m3 density and Calcium Chloride with a pH greater than 7.0 at 24% concentration.
The stock solution is filtered by the press filter and placed in storage containers. The primary component is removed from the reactor, as shown in formula 5, to be dried and passed on to the grinder.
(g) Dry, mill and package the primary component, the component from step (f) to obtain Barium Sulfate at 98% purity and 4.40 g/m3 density.
The primary component is dried in a gas heated horizontal oven at a temperature of 150° C. to 300° C., preferably 150° C., for 20 min to 60 min, preferably 30 min. The primary component is introduced into a ball mill to pulverize it to 75 μm, 0.075 mm, 0.0029 in; the pulverized primary component is introduced in a silo for automatically dispensing the amount of 25 kg to 1.5 tons in a bag or double-layer paper bag.
4.40 g/m3 barium sulfate shall not undergo a densification of purity or density after the process. It will keep its higher qualities as if in its natural state. This ensures its use in various applications such as: oil wells, glass industry, automotive industry, pharmaceutical industry, paints and coatings industry, there will not by any physicochemical variations of barium sulfate in its processes, on the contrary it increases the optimization and cost reduction.
Method for Applying the Invention Since it is a 200 mesh fine powder, it always mixes with other elements depending on the intended use.
The main use of barium sulfate is in the oil industry.
It also has important applications in the paint industry as a pigment with acid resistance. It is used for obtaining the element barium.
In the automotive industry, to replace asbestos as frictional product in the manufacture of brake linings. In the glass industry, as a flux.
As protection in X-ray rooms, due to its high density it can absorb radiation. In some cases it substitutes lead.
In the medical industry, when ingested it is a contrast medium in digestive system imaging.
Calcium chloride in 10% pharmacological presentation, therapeutic group, mineral calcium supplement, in replacement of salts: when milk is pasteurized it loses calcium salts, so these salts are replaced with calcium chloride. Indications in emergencies: in cardiac arrhythmias associated with hypermagnesemia and hyperkalemia, severe hypocalcemia, magnesium sulfate or calcium antagonist poisoning, cardiopulmonary arrest unresponsive to adrenaline and suspected hypocalcemia. In the food industry, concrete mixtures, pH buffer and to adjust water hardness, additive in plastics and in fire extinguishers, in water treatment, exothermic solutions of calcium chloride are used in food and beverage cans that self-heat using the heat evolved, in the petroleum industry to increase density of brine-free solids, as expansive clay inhibitor in drilling fluids and as a desiccant.
Number | Date | Country | Kind |
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MX/A/2013/008316 | Jul 2013 | MX | national |