Process to produce alkenoic acid esters from lactones
AssigneeDsm IP Assets B.V.
InventorAnna Maria Cornelia Francisca CASTELIJNS
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Abstract
This invention relates to a process for the preparation of alkenoic acid esters comprising contacting a lactone with an alcohol and an acidic heterogeneous catalyst, characterised in that the process is carried out in the presence of at least 20 ppm of an acid having a pKa of 5 or less, relative to the amount of the lactone. The presence of at least 20 ppm of an acid having a pKa of 5 or less may stabilise the catalyst during the reaction and may also be used for reactivating an acidic heterogeneous catalyst. The improved yield advantageously allows energy conservation.
Claims16
Process for the preparation of alkenoic acid ester comprising:
- (a) contacting a lactone with an alcohol and an acidic heterogeneous catalyst, wherein the process is carried out in the presence of at least 20 ppm of an acid having a pKa of 5 or less, relative to the amount of the lactone.
Process for reactivation of an at least partially inactivated acidic heterogeneous catalyst comprising:
- recovering said at least partially inactivated acidic heterogeneous catalyst from a process for the preparation of alkenoic acid esters from a lactone in the presence of an alcohol;
- and
- contacting said acidic heterogeneous catalyst with an acid having a pKa of 5 or less.
Dependencies are inferred from the claim text.