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

FIELD: alcohol industry. SUBSTANCE: alcohol is digested from brew in brew-epuration column accompanied by transferring ethyl alcohol into brew distillate with vapors effluent from this column. Brew distillate is purified from head and intermediate impurities, including fusel oil, in epuration column involving hydroselection operation. Epurate is rectified in alcohol column to yield fusel oil fractions, fusel alcohol, and non- pasteurized ethyl alcohol fractions. Fusel oil and fusel alcohol fraction are rectified in fusel column, fusel oil being withdrawn from accumulator drum. Ethyl alcohol is additionally purified by way of removing fusel-ester-aldehyde-methanol fractions from carbon dioxide separator condenser, condenser, and alcohol trap of brew-epuration column, as well as methanol-ester-aldehyde fraction from condenser of methanol column which is fed with liquid from dephlegmator of brew- epuration column and heated by epurated water-alcohol vapors from this column. Epuration of brew distillate is carried out in epuration column, digestion part of which is separated by hollow insertion into two zones. Upper zone serves to digest methanol, esters, aldehydes, and other head impurities from ethyl alcohol, which are concentrated in concentration part of epuration column and its dephlegmator and are further removed from condenser. In lower zone, fusel oil components and other impurities are digested from ethyl alcohol and are taken from hollow insertion with steam which is used to feed and heat concentration column, onto upper tray of which hot water is fed. Fusel oil components and other impurities are concentrated in this column and tapped from condenser with fraction which, together with fractions from carbon dioxide separator condenser, condenser, and alcohol trap from brew-epuration column are used to additionally feed brew column. From 28-36th trays of this column, propyl alcohols' fraction is withdrawn, and from condenser of this column methanol- ester-aldehyde fraction is tapped. These fractions together with those from condensers of methanol, epuration, and alcohol columns feed distillation column, into middle zone of digestion part of which hot water is fed. From condenser, head fraction concentrate is tapped; from liquid phase of tray over hot water inlet, concentrate of propyl alcohols is bled; and from still, water-alcohol liquid is withdrawn and returned into brew. EFFECT: improved process flowsheet. 1 dwg