Patent Application
20190185794
The present invention concerns the technical field relative to the production of beer.
In particular, the invention refers to an innovative plant, and relative process, that allows to produce beer simplifying or eliminating totally many of the preliminary processes necessary in the background art, though optimizing the qualities of the product, for example sensorial and nutritive, and therefore with costs of production/maintenance that are clearly inferior.
The process for the production of beer has been known for millenniums, and has remained more or less unvaried.
The process for the production of beer can be synthetized in the following phases, for example indicated in the references [Ambrosi et al., 2014 http://dx.doi.org/10.1007/s11947-014-1275-0; Pires and Brãnyik, 2015 http://dx.doi.org/10.1007/978-3-319-15189-2].
It is initially foreseen a phase of “Pre-grinding”, usually dry, of the toasted corn or malt (typically malted and toasted barley, or “barley malt”, but also some varieties of grain of other cereals, also not toasted or “raw”), finalized to increase the exchange surface between the malt and the liquid (water) and therefore the transfer of fermentable sugars and enzymes.
It is then foreseen a phase of purification and sanitization of the water to be employed in the phase of mashing. The microbial pathogens must be removed, as well as other eventual organic and inorganic contaminating elements, such as the herbicides. Also the adjustment of the acidity (value of the pH) to the needs of the process of brewing can be executed in this phase.
The following phase if a phase of mashing, in which the mix of water and malts is taken to the suitable temperatures to favour the process of hydrolysis of the polysaccharides present in the malts in simple sugars and amino acids, assimilable by the yeasts during the fermentation. The heating—generally executed with electrical resistance or with free flame—can be executed directly on the entire volume, or on a part thereof, extracted and boiled and therefore re-inserted in the original volume (“decoction”). In this phase it is necessary to maintain a vigorous shake of the liquid by means of mechanical shakers or hydraulic re-circulations, also to avoid caramelization effects of the sugary liquid mass and formation of potentially carcinogenic compounds, implying costs relative to the energy and realization complexity.
It follows then a phase of rinse of the malt (called also in the technical jargon “sparging”), finalized at the extraction of the residue sugars and of the must absorbed by the grains. This phase, realized by making water filter at the temperature of the must (around 78° C.), is particularly onerous in terms of time.
It is then foreseen a phase of hopping and boiling of the must, a stage that—after the removal of the malt round at 78° C. (mashing-out) and a phase of further heating—initiates with the introduction of the hops starting from at least 90° C., and is finalized at realizing some fundamental processes. In common practice, it is consolidated knowledge that by boiling for less than an hour there is the risk of not using completely the α-acids of the hop, therefore the level of bitter can result lower than desired. Further, the foam can result well-formed due to the improper extraction of isohumulones of the hop. A intense boiling, generally for at least one hour, is necessary to bind the compounds of the hop to the polypeptides, forming colloids that remain in the beer and helping to form a stable foam. An open and intense boiling further helps to remove undesired volatile compounds, such as sour constituents of the hop, some external owns, and sulphurous compounds (DMS). A vigorous boiling without the cover is important to permit that these substances do not condense and return in the liquor. Also the limpidity is modified by an intense boiling: if it does not last at least one hour, there will not be an adequate hot break to remove the undesired proteins.
There are then foreseen the phases of fermentation, carbonation and maturation, which start at the moment of the inoculation of the yeasts, which generally consist of various stocks of the Saccharomyces Cerevisiae type and others, in the cooled and ventilated must. Such inoculation must take place as quick as possible in such a way as to avoid contaminations of the must, and the initial concentration of the yeasts is generally comprised between 15 and 20 millions of cells per ml of must.
It is then obviously necessary a process of cleaning and sanitation of the plants and of the environment, which implies a high waste of energy and above all of water, in a measure between 4 and 11 liters of waste water per liter of beer produced (vales that increase as the capacity of the brewery diminishes), such waters being provided with high organic loads, usually in a measure between 2000 and 6000 mg/liter, so as to generally require a treatment in loco before the unloading. Sometimes, the organic residues of the depuration of the waste waters, also together with the exhausted malts, are employed in loco or in centralized plants for the production of biogas, therefore of thermal energy and/or electric energy, through plants of anaerobic digestion.
The process, therefore, requires various working phases which are complex, require the emission of a lot of energy and a high ordinary and extraordinary maintenance of the plants is required.
It is therefore the aim of the present invention to provide an innovative plant for the production of beer, and relative method, which solves said technical inconveniences.
In particular, it is the aim of the present invention to provide a plant for the production of beer from any type of grain (for example, barley, grain or wheat, corn, sorghum, millet and rise) and also without the use of extracts (“all grain beers”), which simplifies significantly the traditional productive process, eliminating or simplifying some necessary productive and maintenance phases with traditional plants, allowing at the same time to obtain an optimal product, as well as a product with a very low content of gluten, even using grains that are particularly rich in it.
These and other aims are therefore obtained with the present plant for the production of beer, as per claim 1.
In accordance with the invention, such a plant (31) for the production of beer comprises at least one section having:
The plant, in accordance with the claim 1 mentioned above, allows to solve, in particular, the following technical problems.
First of all, the need to pre-mash the malt (grains of any type), dry before the insertion, is now eliminated.
In fact, the passage of the mix through the cavitation reactor makes that a cavitation is generated that takes both to an increase of temperature of the mic and to a mashing itself of the grains until the pulverization thereof. The cavitation bubbles that collapse generate locally, on spatial scales generally between a hundred of nanometers and tenths of micrometers, both violent local waves of pressure and intense hydraulic jets, which result in the crush of the grains.
While the energy in entry to the apparatus is provided by the impellers of the pump, the main local heating is represented by the cavitation itself that therefore, as said, is responsible for the increase of temperature in the mix itself and therefore, in accordance with such a solution, external burners are not necessary.
Moreover, the need for mechanical shakers is eliminated. The plant in fact is provided with said pump that activates the circulation through the cavitation path that, it itself together with the cavitation processes, creates an effect that impedes the caramelization of the mixt and/or the formation of lumps. In this way, external shakers are not necessary and the plant result structurally simpler.
With the plant, as claimed, there is also a drastic reduction of the need for cleaning and sanitizing the plant itself and the work environment, with a consequent reduction of the overall working times. This is in fact due to the fact that eventual residue pathogen agents, harmful for human health and for the quality and stability of the beer, present in feed water, shall be advantageously degraded and neutralized in the course of the hydrodynamic cavitation processes, therefore increasing the food safety of the beer and eventual infections in the body of the plant and in the work environment.
A single plant unit, as claimed, allows a direct scalability from a few hundreds to many millions of liters per production session, without modifications in the working times.
Further, there is a containment to inferior values of the higher process temperatures and therefore it is possible to eliminate the phase of boiling, thanks to the completion of the processes of expulsion of the dimethyl-sulphides (DMS), of sanitation and of extraction of the bitter from the hops within a temperature of 100° C. or anyway within the boiling point.
The present plant has been found efficient for obtaining beers with a very low content of gluten (<100 ppm) or without gluten (<20 ppm) without modifying the recipes, therefore using, for example, barley malt at a 100% and without alterations of the fragrance, taste, seal and perlage of the foam.
Similarly, it is also described here a method for the production of beer comprising a phase, which can be, for example, of mashing as well as of hopping, which foresees:
Arrangement of a mix of liquid, preferably water and malt inside a tank (7).
The mix can, for example, foresee only liquid or also liquid and hops in the hopping phase or liquid and not pre-crushed malt in the mashing phase and in any case it can also be prepared directly inside a tank or prepared and then poured inside the tank.
It is then foreseen the phase of movement, by means of at least one pump (1), of said mix along a circulation path (2, 3), said circulation path being connected to the tank (7) in such a way that the mix can be inserted in the tank along said path to be directed again inside the tank (7) in exit from said path.
In accordance with the invention, the path comprises at least one cavitation reactor (2) configured in such a way that it generates a hydrodynamic cavitation process.
Such hydrodynamic cavitation process represents the main internal heating source of the mix.
In this way, as said, the process is simplified since, if for instance used in a mashing phase, it is not necessary to pre-mash the malt and, in any case for any phase in which a high increase of temperature is required, external burners or external heat sources are not necessary. The same pressure waves and mechanical jets provide for the crush of the malt.
Further advantages can be deduced from the remaining dependent claims.
Further features and advantages of the present plant and relative method, as per the invention, will result clearer with the description that follows of some preferred embodiments, made to illustrate but not to limit, with reference to the annexed drawings, wherein:
Figures from 8 to 11 show some experimental results.
As described below, the plant as a whole can be formed of different sections located in fluid communication among them, or the presence of a single section configured to be able to execute all the working phases foreseen could be enough.
The figure shows with number 9 a platform support for such a section or a generic support surface.
The section can be furnished with rotatable wheels which allow a certain mobility, according to the dimensions thereof, rendering it transportable and mobile.
Going further into the detail of the invention, such a section of
Always as shown in
As shown in the top view of
Going on with the structural description of the invention, as also shown in
For each pump at least one Venturi conduit is therefore foreseen and the number of Venturi conduits is not therefore inferior with respect to the number of pumps.
In this way, as also clarified below in the present description, regarding the functioning of the plant, a circulation of the fluid is created that from the tank 7 is aspirated through the normal return conduit 3 to be reinserted in the tank 7 through the Venturi tube 2.
The Venturi tube notoriously forms a restriction section to then re-widen, obliging the fluid to suffer a sudden acceleration that, in turn, causes a cavitation phenomenon. The circulation along such a path is maintained through the activation of said electro-pumps 1, so a continuous circulation is obtained with a continuous formation of cavitation for all the time in which the pumps that generate the flow are activated (time that depends on the working process in said mashing phase, as well as in the subsequent phases).
The passage through the narrowing of the Venturi tube determines such hydrodynamic cavitation that is at the base of the working process of beer, as per the present invention.
The cavitation process frees energy in the liquid and causes, as a consequence, a rise of the temperature at the base of the mashing process without the request for further thermal energy inserted in the system. The same cavitation causes the crush of the malt, as well as of any variety of also not malted grain, directly in water, to form a must in which the malt yields the own content of starch and enzymes without the need for a process of pre-mashing. The same cavitation, further, impedes the formation of solid residues and of caramelization, therefore rendering the use of shakers superfluous in such section.
The continuous formation of bubbles and the subsequent collapse thereof, as known, frees pressure waves and hydraulic jets that are at the base of the rise of temperature of the liquid and also of the destruction of the solid particles of malt that in this way pulverize, favouring the extraction of malt and enzymes thereof for the formation of the must.
The entire apparatus is therefore innovative since operating in a hybrid regime, foreseeing the volumetric heating of the circulating liquid through the mechanical energy released by the pumps 1 and the activation of different cavitation regimes. In this way, the reactions of yield of the starch by the malts and of the bitter by the hops are activated (in case, as clarified below, a similar section is used in the hopping phase), as well as the further processes that conduct the reduction of the gluten, directly and/or following the inoculation of the yeasts necessary for the crush phase, without the need for external sources such as resistances and burners.
A suitable control of the cavitation process allows therefore to obtain the temperatures necessary for the process of production desired.
In order to allow the maintenance of pre-determined temperatures, the plant, as shown in
Said wet sleeve can anyway be equivalently substituted by a coil inserted in the tank 7 and in contact with the must.
In this way, it is possible to activate such wet sleeve, or the coil, to maintain the temperature at the values desired each time according to the operative protocols foreseen for the different recipes used and types of beer desired.
As said, the cavitation reactor 2 is preferably in the form of a Venturi tube since the use of a Venturi tube has the advantage of optimizing per se the process of hydrodynamic cavitation, preserving the structure from mechanical shocks and, presenting a single narrowing of a sufficiently wide section, avoiding blocking phenomena.
In a variant of the invention, the cavitation reactor 2 must not be necessarily in the form of a Venturi tube but it can also have other alternative solutions, preferably but not in a limiting way, of the stationary type.
For instance, the Venturi tube could be substituted with perforated plates through whose holes the passage of the mix to cause the cavitation is obliged.
There exist, and they should in fact be used, also dynamic systems to generate cavitation but these, even if usable for the present invention, are naturally more complex and more expensive.
The section described in
The embodiment shown in
Therefore, through the rise of temperature within the tank 7 with the cavitation, an increase of pressure of the liquid contained inside of it is caused. In the closed embodiment it is necessary to avoid over-pressures and for such a reason, as shown in
As said, the section described in
The overall volume of liquid circulating in the section, expresses in liters and contained in the tank 7, is comprised in the interval preferred but not limiting between 15 and 30 liters per each kW (kiloWatt) of overall nominal mechanical power of the electro-pumps installed, for the purposes of the heating speed and of the activation of the cavitation regimes desired, and the production times.
The cavitation reactors 2, either in the form of Venturi tube or of perforations present in plate, can be arranged both in the delivery branches of the respective electro-pumps 1, as in
A realization variant of the reactor 2, finalized at the increase of the hydro-cavitation phenomena associated, as well as to reduce the level of noise produced in the operative phase, derives from a solution as shown in
It foresees the convergence in the section of the narrowing (2a), or immediately downstream of said section, preferably but not limiting at a distance not superior to 2 cm downstream of said section, of further secondary flows, directed through pipes (2b) of inferior section with respect to that of the main circulation pipe (2c), having the relative inlet mouth (2d) upstream of said narrowing section. The number of such secondary flows must be at least equal to two and preferably, but not limiting, at least three. The maximum number of secondary flows is linked only to limitations of technical or realization type; the outlet mouths (2e) of said secondary flows must also be all arranged at the same distance from said narrowing section 2a; likewise, the distance between consecutive outlet mouths (2e) must be the same, in such a way as to form a symmetric arrangement.
In order to obtain an optimal cavitation for the productive process, it has been found that the delivery capacity of each of the same pumps, in correspondence of the relative nominal mechanical power, is preferably, but not limiting, comprised between 400 liters per minute and 1200 liters per minute, anyway such as to produce, preferably, a number of cavitation phenomena (NC) comprised, under atmospheric pressure, between the values of 0.1 and 1.
Such NC is expressed as in equation (1):
NC=(P0−Pv)/(0.5·ρ·u2) (1)
where P0 is the average pressure downstream of the reactor (for example, equal to the atmospheric one), Pv is the pressure of steam of the liquid, ρ is the density of the liquid and u is the speed of the flow determined by said carrying capacity of the pump connected to the cavitation reactor, all said quantities expressed in SI units (meters, kilograms, seconds).
The best results for the purposes of the cavitation regimes desired and of the control of the cavitation phenomena themselves have been obtained using for the Venturi tube 2 the geometry, preferred but not limiting, represented again in
As already said, the cavitation could anyway be obtained also with dynamic mobile devices, known and present on the market and therefore not necessarily through a fixed restricted section, such as the Venturi tube or perforated plates.
Naturally, the “static” solutions are extremely much simpler and economical.
In case of use, preferably not limiting, of centrifugal pumps, the rotor of each of such pumps is preferably, but not limiting, open, and the length of the rotor itself is preferably, but not limiting, superior to 160 millimeters, since beyond such last limit further and advantageous cavitation phenomena are generated also in the flow dragged by the blades of the rotor itself.
As shown also in
Always with reference to
As said above, such section could be used in the same way also for the phase of hopping also if
The advantage of using a further section of hopping 33, separated by the preceding one of mashing 31, allows the execution without interruption of further processes of mashing. Such last section of apparatus destined to the hopping, if employed, will receive the must that passes by the section of mashing to a centrifuge 32 to realize a filtration.
The intermediate section of filtration must not necessarily take place by centrifugation.
In any case, the plant of centrifugation can be an ordinary commercial plant of easy availability on the market.
The filtration eliminates the most part of the solid residues of the circulating malts. Moreover, the preceding section has in fact pulverized the solid malt. Thanks to the drastic reduction of the concentration of solid residues, in the segment of apparatus represented in
Basically, such section 33 foresees the cavitation reactors and the pumps as exactly in the section of mashing 31 either to rise the temperature to the value requested, or for the extraction of the α-acids from the hops, for the hopping process. The section can include, in addition, a cooling device that has to beat quickly the temperature in accordance with the process of production of beer, also for proceeding with the subsequent phases of fermentation, carbonation and maturation.
Precisely in virtue of the fact that, at this point of the production process, the solid parts are already inexistent (consider that the hop is introduced in proportions of a few hundreds of grams per each hundred of liters of must), then for the sudden cooling said direct thermal exchange cooling system of the circulating must can be used, wherein the electro-pump 27 aspirates the must itself along a conduit that enters in the exchanger 28 where the conduit of cooling fluid converges.
Naturally, equivalent cooling systems, which do not foresee necessarily a heat exchanger that moves the must, can be used without for this moving apart from the present invention, for example the same sleeve 4 of the section of
All the other components of the hopping plant are totally analogous to those employed in the segment of apparatus destined to the mashing and represented in
Therefore, the rise of temperature desired in the phase of hopping is obtained in an equivalent manner to the one described, that is through the cavitation. The necessary quick temperature reduction takes place by activating the heat exchanger or other foreseeable cooling.
The section identified with number 31 is the one specific for the phase of mashing (therefore eventually lacking the cooling system to quickly reduce the temperature but in any case provided with a cooling system of exchange with a closed-circuit circulating cooling liquid where to allow the realization of the thermal profiles foreseen by the protocols relative to the different recipes used and types of beer desired).
The sections with number 33 are those of hopping, described also previously, and that are substantially identical to the section 31 except for the fact that they include a cooling system to reduce the temperature the is generally different with respect to the one of the section 31.
Between them a centrifugation section 32 is interposed which, as said, is well known in the state of the art.
According to said embodiment, the tanks of the must in the segments of the apparatus destined to the hopping 33 will have, each, preferably but not limiting a volume that is inferior with respect of the tanks of the must of the segment of apparatus of mashing 31 because the volume of the must for the hopping has been previously deprived of the malts, resulting in an inferior volume.
It is further preferable, but not limiting, to dispose for safety reasons of more than one unities of the segment of apparatus of hopping 33 since it is necessary to immediately bring the must, after the mashing and the centrifugation, to a unit of hopping, so as to avoid cooling phenomena and eventual contaminations.
The flows of the must between the three segments of apparatus 31, 32 and 33 can be easily handled in an automatic way according to common industrial standards, including the circulation pumps that connect the three segments. Moreover, all the parts and the components of the apparatus in contact with the must are realized in inox steel for the food industry, preferably but not limiting shone in order to minimize the scales, in particular of the exhausted residues of the hops, or in another material idoneous for food provided that it is capable of supporting the hydraulic pressures eventually necessary to obtain the cavitation regimes desired.
In use, therefore, the plant described works as follows:
The mix of water and malt according to the proportions known in the production of beer is inserted in the tank 7 of the section of mashing, being possible to insert the malt from the beginning of the process, or at specific temperatures during the heating of the water in the segment of plant 31, according to specific recipes and as is known in the state of the art of production of beer. Nevertheless, surprisingly, it has been found that, with the characteristic process of the segment of plant 31, no differences in the final product are found, even inserting the malt from the beginning of the process itself. Therefore, the pumps 1 are activated in such a way as to cause the circulation of the mix, or of the single water in case of subsequent insertion of the malt, along the delivery and return path and therefore causing the cavitation that rises the temperature and fragments the malt.
The ideal temperature reached is maintained for the process in question and for the necessary time, in particular, preferably but not limiting, in order to optimize the extraction of the starch from the malt, the must should be maintained at temperatures comprised between a minimum comprised in the interval between 60° C. and 65° C., and a maximum comprised in the narrower interval between 72° C. and 75° C., and anyway preferably without exceeding the maximum value of 75° C., for a quantity of time corresponding to the electricity consumption for the activation of the electro-pumps equal to at least 3 kWh for each hectoliter of circulating must, after which the must should preferably be heated until the temperature of 78° C. for the block of the enzyme activities, to proceed then with the extraction of the malt through the segment of filtration 32.
Subsequently, therefore, the must is centrifuged, or anyway purified with other traditional systems, from eventual residues, to then pass to the phase of hopping that can take place in the same section (if provided with a quick cooling plant) or in specific separate section, identical to the section of mashing but provided with a quick cooling system.
In such phase of hopping the rise of temperature is again foreseen in accordance with said phase, which, surprisingly and advantageously, as already mentioned, has been found to be able to be limited to the rise of the boiling point, generally around the 102° C., avoiding the subsequent phase of boiling which is instead necessary in the traditional processes. Therefore, the must will be preferably heated without interruptions and preferably without activating the cooling system until the boiling point. In the same phase, moreover, the insertion of the hops can be executed from the beginning, independently from the starting temperature, and anyway preferably but not limiting in such a way that the time of permanence of the hops is equal to at least 10 minutes during heating. Once the boiling point has been reached, the pumps will be de-activated, while the quick cooling system will be activated, in order to suddenly reduce the temperature until the characteristic values for the survival of the specific yeasts to be inserted immediately after the subsequent phase of fermentation, such characteristic values of temperature being, for example, comprised between 17° C. and 28° C. In order to minimize the risks of contamination of the must, said cooling should preferably but not limiting be inferior to 20 minutes and anyway not superior to 30 minutes. It is important to note that, as projected, and in particular if the axis of the delivery branches 2 are approximatively tangential with respect to the contour of the tank 7, the plant does not need systems suitable to create whirls and whirlpools, often present in the traditional apparatus in order to collect at the bottom of the tank of hopping various proteins and residues, including those of the malts and of the exhausted hops.
There are then foreseen the phases of fermentation, carbonation and maturation, which start at the moment of the inoculation of the yeasts, generally belonging to various stocks of the Saccharomyces Cerevisiae type and others, in the cooled and ventilated must. Such inoculation must take place, as said, as quickly as possible so as to avoid contaminations of the must and for that reason said cooling plant is necessary to quickly beat down the temperature of the boiling point (generally around the 102° C.) reached in the phase of hopping to said characteristic interval of temperatures necessary for the survival of the yeasts (for example, comprised between 17° C. and 28° C.)
A variant of the invention is shown with reference to
In such configuration, the malts are not freely circulating but contained in a basket 43, of perforated mesh, therefore not only directly subject to the cavitation phenomena and they are not frantumated and pulverized. For this reason, the malts themselves must be previously pre-crushed before the relative insertion in the basket 43, in order to obtain a transfer of the starches from the malts that is sufficiently quick and efficient, even if anyway in a generally inferior measure with respect to the preferred embodiment of
In any case, the increase of temperature is obviously obtained in an equivalent manner to what has been previously described for the other embodiments.
Although the first embodiment described is the preferred one because it produces the fastest and most efficient transfer of the starch and eliminates the phase of pre-crush, such further embodiment with basket has, however, the advantage of applying the same principle of the cavitation for the purposes of all the other effects, including the rise of temperature, even if a subsequent centrifugal section is not available.
In the variant exemplified in
In accordance with the present invention, it is to be noted that the plant described, in the embodiment of the segment of plant of mashing 31 illustrated in
This has been widely demonstrated with tests on a prototype plant. The test compares the functioning of a plant in accordance with the invention (Test C01, C02, C03) both with traditional plants (B1 e B2) and with the segment of plant of mashing realized according to the realization variant illustrated in
Analogous results to those relative to the saccharification temperature are found with respect to the efficiency of mashing, that is the efficiency of extraction of the starch from the malts, as illustrated in
The extraction and the isomerization of the α-acids of the hops, finalized at the conferment of the bitter taste and the flavour of the beer, are evaluated quantitatively by means of the so-called use factor of the α-acids themselves, well known in the field of the processes for the production of beer.
As shown in the graphics of
Surprising results have been found with respect to the concentration of gluten in the finite beers produced by means of the segment of plant 31, as illustrated in
In the subsequent phase of extraction of the malts and previous to the insertion of the hops or anyway of the cooling at the end of the hopping, for the purposes of the reduction of the gluten under the threshold “gluten-free” equal to 20 mg/liter (or equivalently, 20 ppm), it has been found convenient, both for the energetic efficiency and for the process times, to activate a cavitation regime (CHC) characterized by Number of Cavitation (NC) equal on average to at least 0.3 and preferably but not limiting comprised in the interval 0.25<NC<1 at temperatures T preferably but not limiting comprised in the interval 70° C.<T<74° C., obtainable through application of an additional hydraulic pressure, for a time corresponding to a CE energetic consumption preferably but not limiting comprised in the interval 0.12 kWh/liter<CE<0.17 kWh/liter. Alternatively, in the same phase, for the purposes of the reduction of the gluten under the threshold “very low concentration of gluten” equal to 100 mg/liter (or, equivalently, 100 ppm), it is possible to activate a CHC regime characterized by Number of Cavitation corresponding to the atmospheric pressure, to temperatures T preferably but not limiting comprised in the interval 70° C.<T<74° C., for a time corresponding to the energetic consumption preferably but not limiting comprised in the interval 0.22 kWh/liter<CE<0.29 kWh/liter.
Maintaining what has been said above on the application, preferably alternative but also consecutive, of said CHC regimes in cooking phase before the fermentation phase, it is advisable to execute a CHC process in the period immediately subsequent to the inoculation of the yeasts, under atmospheric pressure and at the normal temperatures of the must in fermentation, for a time t1 preferably but not limiting comprised in the interval 20 min<t1<45 min. In this last case, for the purposes of the decay of the concentration of gluten, the permanence of the must of beer in the tank of fermentation is advisable for a time t2, preferably but not limiting superior to 20 days (t2>20 days).
If the must has been pre-treated according to above mentioned indications, in particular in the phase preceding the inoculation of the yeasts (70° C.<T<74° C.), it has been surprisingly found that it is possible to foresee the moment in which the concentration of gluten desired is obtained during the phase of maturation, subsequent to the phase of fermentation and executed, for example, in bottles, barrel or other tanks, on the basis of the equation (2):
Conc=A·tP (2)
where Conc is the concentration of gluten (in unity mg/liter), A is a multiplicative coefficient (A>0) and p is the exponent of the time of maturation t expressed in days (p<0). The values of the parameters A and p can be determined experimentally for each specific combination of recipe and modality of process, also on the basis of two single values of the concentration of gluten at as many different instants, preferably but not limiting separate one from the other one of at least 7 days, in order to predict the necessary time for reaching the threshold desired of the concentration of gluten. The equation (2) is inventive because it is specific, and applicable, preferably, for the case of pre-treatment of the must of beer through the inventive apparatus according to said indications.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/IT2016/000194 | 8/9/2016 | WO | 00 |
