HETEROPOLYACID CATALYST FOR PREPARING METHACRYLIC ACID

摘要

PROBLEM TO BE SOLVED: To provide a heteropolyacid catalyst having a high productivity of high methacrylic acid. SOLUTION: A heteropolyacid catalyst containing water-soluble heteropolyacid and hardly water-soluble heteropolyacid salt for preparing methacrylic acid is disclosed. The water-soluble heteropolyacid and the hardly water-soluble heteropolyacid salt of the finished catalyst has the degree of reduction controlled by controlling the degree of reduction controlled at the time of preparing a slurry. COPYRIGHT: (C)2009,JPO&INPIT