METHOD OF RECYCLING MONOCHLOROACETIC ACID PRODUCTION WASTES (VERSIONS) Russian patent published in 2012 - IPC C07C53/16 C07C51/41 C09K8/528 

FIELD: chemistry.

SUBSTANCE: invention relates to chemical engineering and specifically to methods of recycling monochloroacetic acid production wastes, used in production of carboxymethyl cellulose, pharmaceutical preparations, pesticides and ethylene diamine tetraacetic acid. Methods of recycling monochloroacetic acid production wastes involve treating the mother solution obtained from purifying monochloroacetic acid, wherein treatment is carried out by neutralising the mother solution with 30-44% aqueous sodium hydroxide solution at temperature 40-45°C until achieving pH 7-7.5, followed by reaction of the reaction mixture with 25% aqueous ammonia solution in molar ratio of monochloroacetic acid to ammonia equal to 1:1.39-1.46 until achieving pH 8.5-9, with step-wise increase in temperature, first to 50-70°C for 2-3 hours, maintaining pH of the mixture by adding 30% aqueous sodium hydroxide solution, and then to 80-105°C for 1-2 hours, followed by cooling and, if necessary, followed by neutralisation of the reaction mixture with hydrochloric acid at temperature 15-60°C for 0.5-2 hours until pH of the mixture equals 1.

EFFECT: recycling monochloroacetic acid production wastes using a simple, non-waste method to obtain a commercial-grade, mixed reagent for preventing deposits of inorganic salts during oil and gas extraction.

2 cl, 2 tbl, 12 ex