| 摘要 |
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.degree.C is carried out and the reaction mixture is acidified to generate N-phosphonomethylglycine. |
