Improvements in the process for the extraction of glycerine from the waste liquors of alcoholic fermentation

摘要

In a process for treating waste liquors of alcoholic fermentation for the extraction of glycerine, the liquors are neutralized with lime or chalk, filtered, and boiled with ferric chloride, preferably under pressure, until the liquor no longer reacts with Fehling's solution. The iron is precipitated by lime, and then the lime by carbonic acid or sodium carbonate. The resulting liquor is filtered, concentrated, and distilled. In a modification, ferric sulphate is used instead of ferric chloride, the iron being then precipitated by baryta instead of lime.