Nippon Kayaku Kabushiki Kaisha

Toshitake Kojima

Tatsuhiko Kurakami

Masanobu Ogawa

Atsushi Sudo

Shigeo Hayashimoto

Yoshimasa Seo

Yasushi Kobayashi

Hideki Sugi

Kazuo Shiraishi

Fumio Sakai

Koichi Wada

Atsushi Umejima

Shigeo Nippon Kayaku Kabushiki Kaisha Hayashimoto

A method for manufacturing a catalyst of which active components are partly neutralized salt of heteropoly acid comprising molybdenum, phosphorus, vanadium, cesium, antimony, and ammonia as essential components, wherein the method is characterized in mixing an antimony compound with a complex oxide of the essential active components in the catalyst containing active components other than antimony, wherein the antimony compound may be added during slurry preparation.

Catalyst for use in production of methacrylic acid and method for manufacturing the same

It is an object of the present invention to provide a catalyst having excellent performance and high mechanical strength for use in the production of methacrylic acid. A method for manufacturing a catalyst comprising essential active components of molybdenum, phosphorus, vanadium, cesium, ammonia, copper, and antimony for use in the production of methacrylic acid, comprising drying a slurry prepared by mixing a compound(s) containing the essential active components with water and then calcining the resulting dry powder and molding the calcined powder.

Method for manufacturing catalyst for use in production of methacrylic acid

The present invention relates to a method for producing methacrolein and/or methacrylic acid characterized in that the catalyst filling length of a dehydration catalyst layer is 3 to 20% of the catalyst filling length of an oxidation catalyst layer in a method where raw material gas containing gaseous t-butanol is supplied to a fixed-bed multitubular reactor having a dehydration catalyst layer and an oxidation catalyst layer in this order, from the entrance for raw material gas toward the exit, to produce methacrolein and/or methacrylic acid by dehydration reaction and catalytic gas phase oxidation reaction, and the present invention can increase the conventional yield of approximately 80% to 81 to 82% even when a reaction bath temperature is relatively low (approximately 355&#xb0; C.).

Method for producing methacrolein and/or methacrylic acid

Catalysts and process for the preparation thereof

A catalyst comprising (1) palladium, (2) phosphorus, (3) antimony, (4) X and (5) oxygen wherein X denotes at least one element selected from the group consisting of potassium, sodium, rubidium, lithium, cerium, beryllium, magnesium, calcium, vanadium, strontium, zinc, thorium and rhenium. There is also provided a process for the manufacture of methacrylic or acrylic acid by oxidizing methacrolein or acrolein with molecular oxygen in the vapor phase in the presence of the catalyst defined above.

Process for the manufacture of methacrylic or acrylic acid

Methacrolein or acrolein is oxidized with molecular oxygen in the presence of water vapor, a catalyst containing palladium, phosphorus, antimony(optionally) and oxygen and a phosphoric acid or a compound capable of forming phosphoric acid during the reaction.

Catalyst for the manufacture of methacrylic or acrylic acid

Methacrylic acid and its ester or acrylic acid and its ester are prepared at the same time by reacting methacrolein or acrolein with an aliphatic alcohol and molecular oxygen in vapor phase in the presence of a Pd-- P--P-- O or Pd-- P-- Sb-- O catalyst.

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Takasaki, Japan

Toshitake Kojima