Method for the manufacture of aminoalkylene phosphonic acid

Details Method for the manufacture of aminoalkylene phosphonic acid Method for the manufacture of aminoalkylene phosphonic acid

C - Chemistry, Metallurgy

07

F

C07F 9/38 (2006.01)

Patent

CA 2721881

A method for the manufacture of amino alkylene phosphonic acids is disclosed. Pure P4 06 is hydrolyzed in the presence of a homogeneous Broensted acid catalyst whereby the pH of the reaction medium is maintained below 5 and the free water content of said reaction medium is, after the P4 06 hydrolysis has been completed, from 0 to 40 %. The required amine com-ponent can be added before, during, or in one preferred execution, after the P4 06 hydrolysis has been completed. Formaldehyde is then added and the reaction mixture containing the P4 06 hydrolysate, the amine and the formaldehyde is reacted in presence of a Broensted acid catalyst selected from homogeneous and heterogeneous species. The amino alkylene phosphonic acid reaction product can then be recovered in a manner known per sé.

Linvention concerne un procédé de fabrication dacides phosphoniques daminoalkylènes. Du P4O6 pur est hydrolysé en présence dun catalyseur dacide de Brönsted homogène au moyen duquel le pH du milieu réactionnel est maintenu en dessous de 5 et la teneur sans eau dudit milieu réactionnel vaut, après la fin de lhydrolyse de P4O6, de 0 à 40 %. Le constituant damine requis peut être ajouté avant, pendant ou, de manière préférée, après la fin de lhydrolyse de P4O6. Le formaldéhyde est ensuite ajouté et le mélange réactionnel contenant lhydrolysat de P4O6, lamine et le formaldéhyde réagit en présence dun catalyseur dacide de Brönsted choisi parmi les espèces homogène et hétérogène. Le produit réactionnel dacide phosphonique daminoalkylène peut ensuite être récupéré de manière connue en soi.

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