METHOD OF ALCOHOL PRODUCTION AND ALCOHOL "TOPAZ" Russian patent published in 1999 - IPC

FIELD: production of alcohol. SUBSTANCE: method includes fractionation of crude alcohol in fractioning column; rectification of fractionation intermediate product; separation of rectified alcohol from rectifying column; final alcohol rectification in final rectifying column. Novelty consists in that withdrawal of alcohol is carried out in two flows from two zones: from upper zone, from 65th-67th plates with volume fraction of methyl alcohol in terms of absolute alcohol amounting up to 0.06%; from lower zone, from 55th-57th plates with volume fraction of methyl alcohol in terms of absolute alcohol being 0.004. Lower flow is withdrawn from rectifying column and directed to collector of ready-made product. Upper flow is directed for additional rectifying from methyl alcohol to final rectifying column and connected with low flow. Created in each column is rarefaction of 50 kPa. Alcohol produced by the offered method contains volume fraction of methyl alcohol in terms of absolute alcohol not more 0.003%. Mass concentration of ether in terms of ethyl acetate in absolute alcohol is not more 18 mg/cu.dm, mass concentration of free acids (without CO₂) in absolute alcohol is not more 8 mg/cu.dm. EFFECT: reduced content of impurities less the permissible limits. 3 cl, 1 dwg, 2 tbl