Two-stage process for the hydrogenation of maleic acid to...

Details Two-stage process for the hydrogenation of maleic acid to... Two-stage process for the hydrogenation of maleic acid to...

C - Chemistry, Metallurgy

07

C

C07C 51/36 (2006.01) C07C 27/04 (2006.01) C07C 29/149 (2006.01) C07D 307/08 (2006.01) C07D 307/33 (2006.01)

Patent

CA 2418280

In the process for the conversion of maleic acid to gamma-butyrolactone. 1.4- butanediol and/or tetrahydrofuran, a feedstream comprising maleic acid is hydrogenated in a first hydrogenation zone to produce a reaction product comprising succinic acid and unreacted hydrogen which is then supplied to a second hydrogenation zone, where succinic acid is converted to 1,4-butanediol, the temper atures of the feedstream comprising maleic acid and the first hydrogenation zone are controlled such that the temperature of maleic acid in the feedstream and the first hydrogenation zone does not exceed about 130 ~C, thereby minimizing the corrosive effects of the maleic acid and prolonging reactor life and improving overall process economics.

L'invention concerne un procédé pour convertir l'acide maléique en butyrolactone gamma, 1.4-butanediol et/ou tétrahydrofurane. Un flux de charge contenant de l'acide maléique est hydrogéné dans une première zone d'hydrogénation pour former un produit de réaction comprenant de l'acide succinique et de l'hydrogène non transformé. Ce produit passe ensuite dans une deuxième zone d'hydrogénation où l'acide succinique est converti en 1,4-butanediol. Les températures du flux de charge contenant de l'acide maléique et de la première zone d'hydrogénation sont régulées de telle sorte que la température de l'acide maléique dans le flux et dans la première zone d'hydrogénation n'excède pas 130 ·C environ. Ainsi, les effets corrosifs de l'acide maléique sont minimisés, la vie du réacteur est prolongée et l'économie du procédé est améliorée dans son ensemble.

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