Method of production of a dehydrated ethyl alcohol

FIELD: distillery industry; production of a dehydrated ethyl alcohol.

SUBSTANCE: the invention is pertaining to the field of distillery industry, in particular, to the methods of production of a dehydrated ethyl alcohol. The method provides for concentration of the water-alcohol solution purified from impurities by a rectification, its dehydration by adsorption through the molecular sieves and its regeneration by a desorption. Concentration of the water-alcohol solution and its dehydration by adsorption are conducted at the pressure of 105-350 kPa. A part of the formed during the concentration vapors is once more heated up to the temperature of 96-150°C and feed to the stage of desorption, which is realized at the pressure of 5-60 kPa. The rest part of the vapor from the stage of adsorption and a desorption is subjected to condensation and the water-alcohol liquid is fed to the stage of the alcohol concentration with withdrawal of the water from the process. The invention allows to intensify the process of dehydration and to reduce consumption of the heat-power input.

EFFECT: the invention allows to intensify the process of dehydration and to reduce the heat and power inputs.

1 tbl

 

The invention relates to the alcohol industry, more specifically to methods for production of dehydrated ethyl alcohol (absolute).

There is a method of dehydration of concentrated aqueous-alcoholic solution by azeotropic distillation in a separate drying column, and distillation of the mash, the concentration of water-alcohol solution and regeneration of the auxiliary separating agent is carried out in another column (Kizyun GA, Mikhnenko E.A., Gil G., ANCOVA N.M. Getting dehydrated alcohol. Agroniiteipp, series 24, Alcohol, yeast and alcoholic beverage industry, 1995, issue 1-2, p.21-27).

Implementation of the above method requires the use of auxiliary separating agent, for example cyclohexane, high metal and energy consumption.

Known better method of production of ethyl alcohol absolute, involving the distillation of the mash, concentrating the resulting aqueous-alcohol solution by distillation, and dehydration by adsorption, the adsorbent used molecular sieve with a pore size of 2.7-4.6 angstroms (Declaratii patentNo. 50390 And 12 F 3/00. Spob virobnictva alcohol, amylovora absolutevalue ABO polivnogo the ethanol / Stelly,Hocson, Osseo NS - Publ. 15.10.2002, bull. No. 10) (prototype).

Factor hindering the achievement of the required technical result is a large amount of water-alcohol liquid formed at the stage of regeneration (desorption) of molecular sieves, including the fluid directed to the wetting of these sit at the stage of adsorption, thereby increasing the cost of heat flow meters for recycling of return flows, increased intensity of installation for implementing the method.

The basis of the invention the task is improving the way the dehydration of ethanol by the introduction of new technological methods and process parameters.

The technical result from implementation of the proposed invention consists in the intensification of the dehydration of water-alcohol solution by eliminating wetting molecular sieves adsorption and drying by desorption, and, accordingly, reduce the amount of aqueous-alcoholic fluids at the stage of regeneration (desorption) molecular sieves and returned to the stage of concentration.

Consumer properties related to the technical result, cost reduction of the heat flow meters on the dehydration process and reducing the metal installation for implementing the method.

Achieved technical result of the fact that the method of obtaining with the IRTA absolute ethyl, including the concentration of refined water-alcohol solution by distillation, his dehydration by adsorption through the molecular sieve regeneration by desorption, the concentration of alcohol and dehydration by adsorption is carried out at a pressure of 105-350 kPa, and steam phase after concentration to overheat temperature 96-150°and carry out the adsorption and desorption is carried out at a pressure of 5-60 kPa using part of a couple, the last stage of adsorption, while the rest of the most of the steam from the stage of adsorption, as well as couples from the stage of desorption, condensation, and water-alcohol liquid is directed to the stage of concentration of alcohol and removal of water from the process.

Carrying out adsorption and desorption in the vapor phase greatly intensifies the dehydration of water-alcohol solution by eliminating wetting molecular sieves adsorption and drying by desorption, reduces the amount of water-alcohol solution, which return for regeneration.

Application at the stage of adsorption and desorption, respectively, pressure 105-350 kPa and 5-60 kPa allows you to increase the differential pressure (temperature) between stages of adsorption - desorption and to reduce the time required for regeneration of molecular sieves. Pressure value is selected depending on the average pore size molecular sieves. For example, 300-35 kPa and 5-15 kPa, accordingly, at the stages of adsorption and desorption average pore size of 2.7-3.3 angstroms and about 105-150 kPa and 40-60 kPa - when the pore size of 4.0-4.6 angstroms.

Overheating of the steam phase of the concentrated water-alcohol solution before the adsorber to a temperature 96-150°eliminates the condensation of steam when heated molecular sieves and their wetting, as in this case, the heating of the molecular sieves is due to the heat of the cooling of superheated steam. This enables to reduce the amount of water-alcohol solution which is returned to the regeneration. The choice of reheating temperature depends on the temperature of the Sith, the magnitude of the heat loss through the insulation, the ambient temperature and other

The return of the water-alcohol solution obtained by desorption of molecular sieves, to the stage of concentration allows you to return the alcohol to the stage of adsorption, and water to process.

Using part of a couple, the last stage of adsorption, at the stage of desorption allows to intensify desorption, due to the additional supply of heat for heating the molecular sieve from the pair of anhydrous alcohol from the stage adsorption additionally evaporates moisture from the pores of molecular sieves and increases the degree of regeneration of molecular sieves, which enables to reduce the intensity of the installation.

Conducting concentration in the but-alcohol solution and dehydration by adsorption under the same pressure reduces the intensity of the unit for feeding directly into the vapor phase of the concentrated water-alcohol solution on the adsorption stage right from the stage of rectification.

The condensation of the vapor phase from the stage adsorption allows you to get the finished product that meets the requirements of normative documents on ethyl alcohol anhydrous (absolute), and from the stage desorption - water-alcohol liquid, convenient for keeping and transportation for recycling.

The claimed method is as follows.

In the case of production of ethyl alcohol dehydrated high quality water-alcohol solution is cleaned from the head and intermediate impurities and concentrate in the distillation column to the volume fraction of ethyl alcohol in it 90-97% under pressure 105-350 kPa. In this part (3/4) alcohol vapor from the upper part of the distillation column condense and return to the top tray of the column in the form of phlegmy, and the rest (1/4) overheat to a temperature 96-150°and fed to the adsorber with molecular sieves. Water molecules penetrate the pores of the molecular sieves and adsorbed there. From the adsorber goes dehydrated alcohol vapor at a pressure of 100-340 kPa and a temperature of 85-140°C. a Portion of the dehydrated vapor is directed to a stage of desorption, and the rest condense. Ethyl alcohol absolute high quality with volume fraction of water in accordance with applicable regulatory document, such as 0.2%, take away from the process. Water is istovy solution after desorption sent for re-processing at the stage of concentration, where alcohol concentrate and return to the stage of adsorption, and water is removed from the bottom of the column.

In the case of production of dehydrated ethyl alcohol for fuel or for other technical purposes, which do not require cleaning from accompanying ethyl alcohol impurities, the mash is distilled and concentrating the resulting aqueous-alcoholic solution in the same column under pressure 105-350 kPa to the volume fraction of alcohol in it 90-97%. Like the first option part of the alcohol vapor from the upper part of the distilling column condense and return to the top tray of the column in the form of phlegmy, and the remainder to overheat temperature 96-150°and fed to the adsorber with molecular sieves. Water molecules penetrate the pores of the molecular sieves and adsorb there.

From the adsorber goes dehydrated alcohol vapor at a pressure of 100-340 kPa and a temperature of 85-140°C. a Portion of the dehydrated vapor is used to improve the regeneration of molecular sieves at a stage of desorption, and the rest of the parts after the condensation get dehydrated ethyl alcohol for fuel additives or other technical needs with volume fraction of water in accordance with applicable regulatory document, for example 0.5%.

After completion of the adsorption process stop the flow of superheated water-alcohol vapor in the canister, and the molecular sieve is subjected to desorption at which the pressure 5-60 kPa. Because of the significant pressure drop change the boiling point of water and ethyl alcohol, the molecular sieves are exempt from the water, and the resulting water and alcohol vapors are sent to condensation. After condensation of the water-alcohol solution is re-processed at the stage of concentration. Concentrated alcohol return to the stage of adsorption, and water is removed from the process.

Data supporting the achievement of the technical result and the advantages of the proposed method in comparison with the prototype presented in the table.

Table
Name of indicatorPrototype methodThe claimed method
The amount of water-alcohol solution from the stage of desorption, % by volume of the target product40,030,0
The volume fraction of alcohol in the water-alcohol solution from the stage of adsorption, %88-9080-82
The specific consumption of heating steam, kg/dal29,027,0
Volume fraction of water in the final product, %0,20,2

These tables show that for the same water content in the final product, the amount of water-alcohol solution from the stage is desorbcii reduced by 10% relative to the volume of the target product. The specific consumption of heating steam for the process is reduced by 1-2 kg/gave.

The method of producing ethyl alcohol absolute, including the concentration of refined water-alcohol solution by distillation, his dehydration by adsorption through the molecular sieve regeneration by desorption, characterized in that the concentration of water-alcohol solution and its adsorption dehydration is carried out at a pressure of 105-350 kPa, the part formed by the vapor concentration to overheat temperature 96-150°and direct to the stage of dehydration by adsorption, some dehydrated pair held adsorption, direct to the stage of desorption, is carried out at a pressure of 5-60 kPa, the remaining portion of the vapor from the stage adsorption stage and desorption of condensed, aqueous-alcoholic liquid refer to the stage of concentration of alcohol and removal of water from the process.



 

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