METHOD FOR PREPARING LIQUID CARBON DIOXIDE FROM GASES OF ALCOHOLIC FERMENTATION Russian patent published in 2004 - IPC

FIELD: chemical and food industry, chemical technology.

SUBSTANCE: invention can be used in producing liquid carbon dioxide in alcoholic and brewing factories. Gas passed through water scrubber (1) and water separator (3) sequentially is fed to the first step of three-stage compressor (4), pressed it to 0.5 MPa, cooled with water in tubular cooler (5) to 30-35^oC and fed through oil and moisture separator (6) in intertubular space of recuperative heat exchanger (7). Gas-liquid mixture with temperature (-43.5)-(-33.3)^oC is supplied in tubular space of heat exchanger (7) from jet mixer (27). Gas in intertubular space of heat exchanger (7) is cooled to 0^oC, gas in tubular space is heated to (-10)-(-5)^oC and liquid is evaporated. Condensate is removed to collector (8) and cooled gas is fed in one adsorber (9) or (10) filled with activated carbon. Purified gas under pressure 0.4 MPa is fed in receiver chamber of gas-jet mixer (11) and to its nozzle gas is supplied from tubular space of heat exchanger (7) with pressure about 0.8 MPa. Gas under pressure 0.6 MPa going out from mixer (110 is pressed on the second step of compressor (4) to 2.5 MPa, cooled in tubular cooler (12) and through oil and moisture separator (13) fed on the third step of compressor (4). Gas compressed to 7 MPa is cooled again in tubular cooler (14) and through oil and moisture separator (15) is fed in one of adsorber (16) or (17) filled with silica gel. Final drying gas is carried out in one of adsorber (18) or (19) filled with zeolite. Dried gas is liquefied in condenser (20). Part of liquefied carbon dioxide is removed through receivers (21) in cylinders (22). Remained part is throttled in throttle (24) to 0.8-1.2 MPa. Formed gas-liquid mixture is separated in vortex separator (25). Then liquid is fed in isothermic storage (26), gas is supplied to nozzle of jet mixer (27) and part of liquid - in receiver chamber to obtain cold carrying liquid that is fed in tubular space of heat exchanger (7). Invention allows reducing the content of water steam and organic impurities in gas at cooling to 0^oC, to enhance activity of adsorption of impurities. This results to more deep purification of gas.

EFFECT: improved preparing method.

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