Esterification process

Details Esterification process Esterification process

C - Chemistry, Metallurgy

07

C

C07C 67/08 (2006.01) B01J 31/12 (2006.01) C07C 67/02 (2006.01) C07C 67/03 (2006.01) C07C 69/76 (2006.01) C08G 63/85 (2006.01) C08G 63/183 (2006.01)

Patent

CA 2207111

A process for the preparation of an ester comprises carrying out an esterification in the presence of a catalyst comprising the reaction product of an orthoester or a condensed orthoester of titanium or zirconium, an alcohol containing at least two hydroxyl groups, a 2-hydroxy acid and a base. The process can be a direct esterification or a transesterification and can be a polyesterification. The catalyst can effectively produce esters without leading to a haze in the final product and there is a reduced amount of yellowing of polyesters in comparison to known catalysts.

L'invention porte sur un procédé de préparation d'un ester comportant une estérification en présence d'un catalyseur constitué du produit de réaction d'un orthoester ou d'un orthoester condensé du titane ou du zirconium, d'un alcool contenant au moins deux groupes hydroxyle, d'un acide 2-hydroxy et d'une base. Le procédé peut être une estérification directe ou une transestérification et peut être une polyestérification. Le catalyseur peut produire efficacement des esters sans que le produit final ne présente un aspect trouble. Le jaunissement des polyesters obtenus est moindre en comparaison de celui observé avec des catalyseurs connus.

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