Method for the production of methylenedi(phenylamine) and...

C - Chemistry – Metallurgy – 07 – C

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C07C 209/78 (2006.01) C07C 211/50 (2006.01) C07C 263/10 (2006.01) C07C 265/14 (2006.01)

Patent

CA 2320477

The invention relates to a method for the production of methylenedi(phenylamine) by reacting aniline with formaldehyde in the presence of acid catalysts. The method is characterized in that aniline and optionally an acid catalyst are treated in a semi-continuos method; formaldehyde and optionally an acid catalyst are fed through a mixing organ in a circuit in which aniline, optionally an acid catalyst and optionally an already added formaldehyde are circulated and tempering the reaction mixture at a temperature of over 75 ~C after feeding at least 50 % of the total amount of formaldehyde. The invention also relates to a method for the production of polyisocyanates by phosgenating the amines thus obtained and the polyisocyanates obtained according to this method.

L'invention concerne un procédé permettant de préparer de la méthylènedi(phénylamine) par réaction d'aniline avec du formaldéhyde en présence de catalyseurs acides. Ce procédé se caractérise en ce qu'il comprend les étapes suivantes: traitement d'aniline et éventuellement d'un catalyseur acide dans le cadre d'un processus semi-continu; introduction de formaldéhyde et éventuellement d'un catalyseur acide par un élément mélangeur alimentation dans un circuit fermé où l'aniline, l'éventuel catalyseur acide et le cas échéant du formaldéhyde d'ores et déjà ajouté, sont déplacés en boucle; après alimentation d'au moins 50 % du volume global de formaldéhyde à intégrer, températion du mélange réactionnel à une température supérieure à 75 ·C. L'invention concerne en outre des procédés de préparation de polyisocyanates par phosgénation d'amines ainsi obtenues, ainsi que des polyisocyanates obtenus selon ledit procédé.

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