PROCESS FOR INCREASING THE CONCENTRATION OF AQUEOUS ACETIC ACID BY EXTRACTIVE DISTILLATION

摘要

1440908 Acetic acid HOECHST AG 20 Feb 1975 [20 Feb 1974] 7190/75 Heading C2C The concentration of acetic acid in aqueous solution is increased by extractive distillation with N-methyl acetamide and the separation of acetic acid from the resulting mixture. The second separation may be by rectification in a column from which the N-methyl acetamide may be recycled.