Mitsubishi Rayon Company, Limited

Motomu Ohkita

Toru Kuroda

Naoshi Murata

Seigo Watanabe

Yasukazu Yoshida

Kimio Tamura

(Meth)acrylic acid is reacted with a fatty acid anhydride and the resultant reaction mixture is neutralized and washed with an aqueous alkaline solution having a pH of 7.5 to 13.5. Thus, high-purity (meth)acrylic anhydride can be industrially advantageously produced while avoiding polymerization. This (meth)acrylic anhydride is reacted with a secondary or tertiary alcohol in the presence of a basic compound which in 25&deg; C. water has an acidity (pKa) of 11 or lower. Thus, a high-purity (meth)acrylic ester can be produced in high yield.

Process for producing (meth)acrylic anhydride and process for producing (meth)acrylic ester

For providing a molded catalyst or a supported catalyst which has an excellent mechanical strength and is intended for producing methacrolein and methacrylic acid from isobutylene or tertiary butanol, the surface of a molded catalyst or a supported catalyst which contains molybdenum, bismuth and iron is coated with one or more highly depolymerizable organic high-molecular weight compounds. When used, the catalyst is packed into a reactor and then heated to remove the organic high-molecular weight compound(s) by depolymerization.

Molded catalyst or supported catalyst for synthesizing methacrolein and

Process for preparing a catalyst for producing methacrylic acid

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Otake, Japan

Motomu Ohkita