Process for preparing n-phosphonomethyl-glycine

Details Process for preparing n-phosphonomethyl-glycine Process for preparing n-phosphonomethyl-glycine

C - Chemistry, Metallurgy

07

F

260/501.5

C07F 9/38 (2006.01)

Patent

CA 2001836

PROCESS FOR PREPARING N-PHOSPHONOMETHYL-GLYCINE A B S T R A C T The invention relates to an improvement of a process for preparing N-phosphonomethyl-glycine by oxydation of N-phosphonomethyl-imino-diacetic acid in an aqueous sulphuric acidic medium with hydrogen per- oxide. A characteristic feature is using a waste acid liquor as reaction medium formed as aqueous sulphuric acid and obtained after the separation of N-phosphono- methyl-glycine when carrying out oxydation. This solution is optionally diluted with water until a concentration of 12-18 weight% of sulphuric acid and 3-5 weight% of N-phosphonomethyl-glycine.

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