Method for the production of (meth)acrylic acid esters

Details Method for the production of (meth)acrylic acid esters Method for the production of (meth)acrylic acid esters

C - Chemistry, Metallurgy

07

C

C07C 67/08 (2006.01) C07C 67/58 (2006.01) C07C 69/54 (2006.01)

Patent

CA 2272868

The invention relates to a method for producing (meth)acrylic acid esters by reacting (meth)acrylic acid with C4-C12-alkanols in the presence of sulfuric acid or of a sulfuric acid mono-C4-C12-alkyl ester as a catalyst, wherein the catalyst is regenerated by extraction with water from the reaction mixture and the aqueous catalyst solution is reintroduced into the esterification. The concentration of non-reacted alkanol in the reaction mixture that is to be extracted amounts to a maximum of 5 wt.% in relation to said reaction mixture.

L'invention concerne un procédé pour la préparation d'esters d'acide (méth)acrylique par réaction d'acide (méth)acrylique avec des alcanols C¿4?-C¿12? en présence d'acide sulfurique ou bien d'un monoester d'alkyle C¿4?-C¿12? d'acide sulfurique comme catalyseur. Ce catalyseur est régénéré par extraction avec de l'eau du mélange de réaction et la solution aqueuse de catalyseur est réutilisée pour l'estérification. La concentration en alcanol n'ayant pas réagi dans le mélange de réaction à extraire atteint au maximum 5 % en poids par rapport au mélange de réaction à extraire.

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