METHOD OF PRODUCING RECTIFIED ETHYL ALCOHOL Russian patent published in 1997 - IPC

FIELD: ethyl alcohol production. SUBSTANCE: invention relates to a method of producing rectified ethyl alcohol by way of digesting alcohol from brew in brew or brew-epuration column accompanied with transferring alcohol with associated impurities into brew distillate together with liquid fractions from condenser of carbon dioxide separator, dephlegmator, condenser, and alcohol trap of brew and brew-epuration column; purifying brew distillate from top and intermediate impurities, including fusel oil components, in epuration column using hydroselection; rectifying epurate in alcohol column with side takeoff of fusel oil and non-pasteurized alcohol components from condenser. Essence of invention consists in that ethyl alcohol is additionally purified via taking of methanol-ether-aldehyde fraction from condenser of methanol column, which is supplied with liquid from dephlegmator and alcohol trap of brew or brew-epuration column. Into middle zone of concentration part, liquid from condensers of carbon dioxide separator and brew or brew-epuration column is fed. Epuration of brew distillate is carried out in epuration column, onto upper plate of which water is supplied, and from vapor space of feed plate, a part of vapor is removed to heat methanol column. From condenser, fraction of fusel oil and intermediate impurities is taken off and is fed into middle zone of fusel isolation and purification column, which receives hot water onto its upper plate and which is heated and additionally supplied with vapor from 5-14th plate vapor space of alcohol column, whereas from column still, water-ethanol-propanol liquid is withdrawn, diluted with hot water, and fed into digestion zone middle part of fractionation column fed with fractions from condensers of methanol and alcohol columns. From condenser of fractionation column, top fraction concentrate is taken off, from liquid phase of plate located over water-ethanol-propanol liquid inlet, propyl alcohols' concentrate is withdrawn, and from still of column, water-ethanol liquid, which is directed into initial brew. EFFECT: improved process flowsheet. 1 dwg, 1 tbl