Process for the production of dialkyl maleates

Details Process for the production of dialkyl maleates Process for the production of dialkyl maleates

C - Chemistry, Metallurgy

07

C

260/481.2

C07C 67/08 (2006.01) C07C 69/60 (2006.01) C07C 69/657 (2006.01)

Patent

CA 1294630

ABSTRACT PROCESS A process is described for the production of a dialkyl maleate by reaction of maleic anhydride with an alkyl alcohol in a monoesterification zone to form the corresponding monoalkyl maleate, followed by reaction of resulting monoalkyl maleate with further alkyl alcohol to form the corresponding dialkyl maleate, which includes the steps of supplying a first liquid feed comprising said monoalkyl maleate to a secondary esterification zone containing a charge of a solid esterification catalyst, supplying a second feed stream comprising said alkyl alcohol to said secondary esterification zone, maintaining said secondary esterification zone at an elevated temperature sufficient to form or to maintain therein a vaporous stream containing said alkyl alcohol, intimately contacting said first liquid feed in said secondary esterification zone in the presence of said catalyst with said vaporous feed stream, recovering from said secondary esterification zone a vaporous effluent stream containing, in addition to alkyl alcohol vapour, also water in vapour form, said water being produced in said secondary esterification zone by esterification of said monoalkyl maleate with said alkyl alcohol, and recovering from said secondary esterification zone a liquid product stream containing said dialxyl maleate.

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