Method for the production of phosphonomethylglycin

Details Method for the production of phosphonomethylglycin Method for the production of phosphonomethylglycin

C - Chemistry, Metallurgy

07

F

C07F 9/38 (2006.01)

Patent

CA 2381412

The invention relates to a method for producing phosphonomethylglycin, by bringing together in a reaction space N-phosmonomethyl iminodiacetic acid-N- oxide and a catalytic quantity of at least one of the following catalysts: thionyl halogenide, diathionite of ammonium or an alkali metal, a dialkyl sulphite, sulphur dichloride, sulphurous acid, sulphur dioxide. The dosage of the N-phosphonomethyl iminodiacetic acid-N-oxide will be such that at least 50 % of the N-oxide put in the reaction space will be transformed.

La présente invention concerne un procédé de préparation de phosphonométhylglycine, dans lequel on met en contact dans un compartiment réactionnel du N-phosmonométhylimino-acide diacétique-N-oxyde avec une quantité catalytique d'au moins un catalyseur choisi parmi un thionylhalogénure, un dithionite d'ammonium ou de métal alcalin, un dialkylsulfite, un dichlorure de soufre, un dioxyde de soufre et un acide sulfureux. Le N-phosmonométhylimino-acide diacétique-N-oxyde est dosé dans le compartiment réactionnel de sorte que constamment au moins 50 % du N-oxyde dosé dans le compartiment réactionnel se transforme.

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