公开(公告)号：DE4327872A1

公开(公告)日：1994-03-03

申请号：DE4327872

申请日：1993-08-19

Applicant: HOECHST AG

Inventor： RITTNER SIEGBERT DR ,  RIEDEL ALFRED DR ,  SCHMIDT ADOLF DR ,  SCHMIERER ROLAND DR ,  SPISKE JUERGEN DR

IPC: C07C51/44 ,  C07C53/16

Abstract: Sepn. of monochloroacetic acid from chlorination mixts. also contg. unreacted acetic acid and the di- and tri-chloroacetic acids is by rectification in a column with an ordered carbon-contg. packing. ADVANTAGE - The process has the following advantages over melt crystallisation: (i) the mono:chloro acid is sepd. in high yields without the formation of a mono:chloro acid-contg. eutectic; (ii) there is no need for prior removal of unreacted acid; and (iii) the sepn. can be effected on a continuous basis. The rectification can be combined with the melt crystallisation process or with a catalytic dechlorination process in presence of H2 (both combinations claimed).