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 with transferring ethyl alcohol into brew distillate with vapor 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 Fusel oil and fusel alcohol fractions are rectified in fusel column, fusel oil being withdrawn from accumulator drum.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 vapor from this column. Epuration of brew distillate is carried out in epuration column with feeding hot water onto upper tray of the column and withdrawing brew-ester-aldehyde-methanol fraction from its condenser. This fraction along with fractions from carbon dioxide separator condenser, condenser, and alcohol trap of brew- epuration column is used as additional feed for brew column. From liquid phase taken from 28-36th trays of this column, propyl alcohols' fraction is isolated and methanol-ester-aldehyde fraction is withdrawn from its condenser. These fractions together with those from methanol and alcohol column condensers are used as feed for distillation column. Middle zone of digestion part of the latter receives hot water and head fraction concentrate is taken from this column's condenser. Concentrate of propyl alcohols is taken from liquid phase from the tray located over hot water introduction point, whereas water- alcohol liquid is withdrawn from the still and returned into brew. EFFECT: improved process flowsheet. 1 tbl, 1 dwg