METHOD OF OBTAINING MONOCHLORACETIC ACID Russian patent published in 2010 - IPC C07C53/16 C07C51/42 C07C51/43 

FIELD: chemistry.

SUBSTANCE: invention relates to chemical technology and specifically to methods of producing monochloroacetic acid used in production of carboxymethylcellulose, pharmaceutical preparations, pesticides and ethylene diamine tetraacetic acid. The method of producing monochloroacetic acid involves crystallisation in a solvent and separation of monochloroacetic acid crystals from the mother solution through filtration, extraction of the solvent from the mother solution and returning to the crystallisation step, where the solvent used is carbon tetrachloride or perchloroethylene as commercial-grade as well as recycled, wherein crystallisation is carried out for 6-8 hours at weight ratio of molten crude monochloroacetic acid : solvent equal to 1:2-2.5. The initial crystallisation temperature is 38°C and the final crystallisation temperature is equal to 0±5°C.

EFFECT: improved process of producing monochloroacetic acid which is expressed in intensification of the crystallisation process, improvement of quality factors of monochloroacetic acid and improved technical and economical factors of production.

4 cl, 1 tbl, 8 ex