Process for preparing unsaturated carboxylic acid ester.

摘要

Disclosed is a process for preparing alpha , beta -unsaturated carboxylic acid ester from alpha -hydroxycarboxylic acid ester, a alpha -alkoxycarboxylic acid ester or beta -alkoxycarobxylic acid ester as a starting material by a vapor-phase catalytic reaction in the presence of a crystalline aluminosilicate modified with an alkali metal and a platinum group element as a catalyst. According to the process, alpha , beta -unsaturated carboxylic acid can be produced efficiently.