Method for producing esters of multibasic acids

C - Chemistry – Metallurgy – 07 – C

Patent

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Details

C07C 69/80 (2006.01) C07C 67/08 (2006.01) C07C 67/54 (2006.01) C07C 69/44 (2006.01) C08G 63/78 (2006.01)

Patent

CA 2428575

The invention relates to a method for producing esters of an acid component chosen from the multibasic C4-C10-carboxylic acids and an alcohol component chosen from C3-C12-alkanols or -alkanediols whose alkyl chain can be interrupted by 1 to 3 oxygen atoms. Sad method comprises the following steps: a) a mixture consisting essentially of the acid component or an anhydride thereof and the alcohol component is heated to boiling in a reaction zone in the presence of an esterification catalyst; b) the vapours containing alcohol and water are separated into a fragment that is rich in alcohol and a fragment that is rich in water by rectification; and c) the alcohol-rich fraction is fed back into the reaction zone, while the water-rich fraction is extracted from the process. The inventive method is simple to carry out and allows the rapid adjustment of an essentially quantitative conversion.

La présente invention concerne un procédé permettant la préparation d'esters d'une composante acide choisie parmi les acides carboxyliques polybasiques en C¿4?-C¿10?, et d'une composante alcool choisie parmi les alcanols ou les alcanediols en C¿3?-C¿12? dont la chaîne alkyle peut être interrompue par 1 à 3 atomes d'oxygène. D'après ledit procédé: a) dans une zone réactionnelle, un mélange constitué principalement de la composante acide ou d'un anhydride de celle-ci, et de la composante alcool, est chauffé jusqu'au point d'ébullition, en la présence d'un catalyseur d'estérification; b) les vapeurs à teneur en alcool et en eau sont séparées par rectification en une fraction riche en alcool et une fraction riche en eau; et c) la fraction riche en alcool est réintroduite dans la zone réactionnelle et la fraction riche en eau est extraite du processus. Le procédé est facile à mettre en oeuvre et permet la réglage rapide d'une conversion essentiellement quantitative.

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