Process for the manufacture of aminopolyalkylenephosphonic...

Details Process for the manufacture of aminopolyalkylenephosphonic... Process for the manufacture of aminopolyalkylenephosphonic...

C - Chemistry, Metallurgy

07

F

C07F 9/38 (2006.01)

Patent

CA 2594902

A beneficial method for the manufacture of amino polyalkylene phosphonic acids, under substantial absence of hydrohalogenic acid, is disclosed. The method, in essence, is based on reacting narrowly defined ratios of phosphorous acid, an amine, a formaldehyde in presence of specific ranges of an acid catalyst having a pKa equal or inferior to 3.1. The inventive method is capable of yielding economically and quality operational/capacity advantages, in particular significantly reduced one-step cycle duration under exclusion. of corrosion disadvantages and also is environmentally friendly without requiring, in that respect, anything more than nominal capital expenditures.

L'invention concerne un procédé de fabrication d'acides aminopolyalkylènephosphoniques en l'absence substantielle d'acide hydrohalogénique. Le procédé est fondé, d'une manière générale, sur la réaction de rapports définis de manière étroite d'acide phosphoreux, d'une amine, d'un formaldéhyde en présence de gammes spécifiques d'un catalyseur acide comprenant un pKa égal ou inférieur à 3.1. Le procédé selon l'invention est capable de produire des avantages sur le plan économique et fonctionnels de qualité/capacité, notamment une durée cyclique en une étape réduite de manière importante, sans les désavantages liés à la corrosion et respecte également l'environnement en n'engendrant, dans ce domaine, que des dépenses de capital nominal.

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