SYNTHESIS CATALYST AND SYNTHESIS METHOD FOR UNSATURATED CARBOXYLIC ACID AND/OR DERIVATIVE THEREOF

摘要

The purpose of the present invention is to provide a catalyst with which the past problem of low yield when synthesizing an unsaturated carboxylic acid or derivative thereof from a hydroxycarboxylic acid or derivative thereof by a dehydration reaction can be solved, and by which an unsaturated carboxylic acid and/or derivative thereof can be synthesized at high yield; as well as to provide a synthesis method with which an unsaturated carboxylic acid or derivative thereof can be synthesized at high yield. Provided are a synthesis catalyst for synthesizing an unsaturated carboxylic acid and/or a derivative thereof from a hydroxycarboxylic acid and/or a derivative thereof by a dehydration reaction, wherein the synthesis catalyst for synthesizing an unsaturated carboxylic acid and/or a derivative thereof is characterized by including an apatite compound in which an alkali metal is contained in a crystal structure; and a synthesis method for an unsaturated carboxylic acid and/or a derivative thereof by a dehydration reaction, wherein the synthesis catalyst is brought into contact with a hydroxycarboxylic acid and/or a derivative thereof and a catalyst.