Verfahren zur Abtrennung von reiner Monochloressigsaeure aus einem Chlorierungsgemisch

摘要

1275231 Monochloroacetic acid KNAPSACK AG 14 April 1970 [18 April 1969] 17746/70 Heading C2C Monochloroacetic acid is isolated from the reaction mixture obtained by the chlorination of acetic acid with chlorine gas at elevated temperature and in contact with an acetic anhydride and/or acetyl chloride catalyst by cooling to room temperature in a crystallizer the parts of which coming into contact with the reaction mixture are made of a polyolefin or polyhaloolefin combining resistance to monochloroacetic acid and the other components of the reaction mixture with thermal stability up to at least 100‹ C. and a maximum thermal conductivity of substantially 0À25 kcal/mh.‹ C. Crystallizer materials specified are polypropylene and polytetrafluoroethylene.