Process for making glyphosate from n-phosphonomethyl-...

Details Process for making glyphosate from n-phosphonomethyl-... Process for making glyphosate from n-phosphonomethyl-...

C - Chemistry, Metallurgy

07

F

260/501.5

C07F 9/38 (2006.01) C07F 9/6584 (2006.01)

Patent

CA 1325641

ABSTRACT The present invention relates to a process for the production of N-phosphonomethylglycine which comprises reacting an aqueous solution of N-phosphonomethyl-2- oxazolidone so as to bring about hydrolysis of the oxazolidone group and formation of carbon dioxide. The reaction is continued till the oxazolidone has been converted to N-phosphonomethylethanolamine or the cyclic internal ester thereof and the carbon dioxide co-product is removed. Thereafter, the hydrolyzate is oxidized by adding a greater than one molar excess, after neutralization of acid groups in the phosphonomethyl group, of an aqueous alkali and a catalyst selected from cadmium, copper, zinc, palladium and platinum and their respective salts, oxides and hydroxides. Heating at a temperature of from 200 to 300°C is carried out and the reaction mixture is acidified to generate N-phosphonomethylglycine.

582034

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