Improved process for the production of bisphenols

Details Improved process for the production of bisphenols Improved process for the production of bisphenols

C - Chemistry, Metallurgy

07

C

C07C 39/16 (2006.01) C07C 37/20 (2006.01)

Patent

CA 2240028

An improved process for the production of bisphenols is presented in which ketones and phenols are reacted in the presence of an acidic cationic exchange resin catalyst and a mercaptan cocatalyst. Prior to the reaction, alkyl alcohol is removed from the ketone stream. Cocatalyst is withdrawn from the reactor so that cocatalyst derivatives such as disulphide ions can be removed from the presence of the catalyst thereby reducing the possibility of catalyst poisoning.

Amélioration apportée à un procédé de production de bisphénols, consistant à faire réagir des cétones et des phénols en présence d'un catalyseur à base d'une résine acide échangeuse de cations, et d'un cocatalyseur à base de mercaptans. Avant la réaction, on élimine l'alcool d'alkyle du flux de cétones. On extrait le cocatalyseur du réacteur afin de permettre l'isolement des dérivés cocatalytiques, tels que les ions bisulfure, du catalyseur, ce qui réduit le risque d'"empoisonnement" du catalyseur.

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