PREPARATION OF ALPHA, BETA-UNSATURATED CARBOXYLIC ACIDS AND ESTERS THEREOF

摘要

An L-type zeolite, a modified L-type zeolite, or any combination thereof may be useful in catalytically preparing α,β-unsaturated carboxylic acids and/or esters thereof through reaction pathways that include dehydroxylation reactions and optionally esterification reactions. In some reaction pathways, dehydroxylation reactions and esterification reactions may be performed sequentially or concurrently.

主权项

1. A method comprising:
providing a composition comprising a reactant selected from the group consisting of an α-hydroxycarboxylic acid, an α-hydroxycarboxylic acid ester, a β-hydroxycarboxylic acid, a β-hydroxycarboxylic acid ester, an α-alkoxycarboxylic acid, an α-alkoxycarboxylic acid ester, a β-alkoxycarboxylic acid, a β-alkoxycarboxylic acid ester, a lactide, and any combination thereof; and performing a dehydroxylation reaction by contacting the composition with a dehydroxylation catalyst, thereby producing a product comprising an α,β-unsaturated carboxylic acid and/or ester thereof, the dehydroxylation catalyst comprising at least one selected from the group consisting of an L-type zeolite, a modified L-type zeolite, and any combination thereof.