Nippon Kayaku Kabushiki Kaisha

Hideki Sugi

Atsushi Sudo

Mutsumi Matsumoto

Yoshimasa Seo

Kazuo Shiraishi

Fumio Sakai

Tatsuhiko Kurakami

Toshitake Kojima

Hiroyoshi Nowatari

Tomoaki Kobayashi

Koichi Wada

Junzo Ohishi

Masahiro Senyo

Atsushi Umejima

An object of the present invention is to provide a process for stably producing a catalyst for methacrylic acid production exhibiting high activity and high performance. The process for producing a catalyst for methacrylic acid production of the invention is characterized in that the water content of the catalyst ingredient powder for use in molding, temperature and humidity of a molding step, humidity and temperature of a baking step are individually controlled in the case where molding is performed by a coating method using an Mo&#x2014;V&#x2014;P&#x2014;Cu-based hetero polyacid as an active ingredient and water or an alcohol and/or an aqueous solution of an alcohol as a binder.

Process for producing catalyst for methacrylic acid production and process for producing methacrylic acid

The object of the present invention is to provide a catalyst for producing methacrylic acid in high yield and highly selectively by subjecting methacrolein, isobutylaldehyde or isobutyric acid to gas phase catalytic oxidation, and the preparation method thereof. The catalyst contains Mo, V, P, Cu, Cs and NHas the essential, active components, and the feature is to use for preparing the catalyst a cesium weak acid salt or cesium hydroxide as the Cs raw material and ammonium acetate as the NHraw material. A coated catalyst of the present invention is obtainable by supporting the active component on an inert carrier of alumina or the like.

Catalyst for producing methacrylic acid and preparation method thereof

The present invention relates to a catalyst for producing methacrylic acid by the vapor-phase catalytic oxidation of methacrolein, comprising Mo, V, P and Cu as the indispensable active components, wherein copper acetate is used for all or a part of the necessary amount of a material for said Cu, a coated catalyst and a method for manufacturing the coated catalyst, and methacrolein is reacted in a high conversion and methacrylic acid is produced in a high selectivity by use of the catalyst of the present invention, and the catalyst can be used for reaction under high loading condition.

Catalyst for methacrylic acid production, coated catalyst, and process for producing the same

An object of the present invention is to provide a catalyst that is highly active and has a large mechanical strength. The catalyst of the present invention contains molybdenum, vanadium, copper and antimony as the essential components, being produced by using antimony acetate for an antimony source material and preferably used for producing acrylic acid by vapor-phase catalytic oxidation of acrolein.

Catalyst process of making

Catalysts and process for the preparation thereof

A simple and excellent process for the regeneration of heteropolyacid catalysts can be provided. A heteropolyacid catalyst, e.g. a phosphomolybdic acid catalyst, whose activity has been lowered can be regenerated by dissolving and/or suspending it in an aqueous medium and then treating with an inorganic ion-exchange material, e.g. crystalline antimonic acid.

Process for regeneration of catalysts

A catalyst having a heteropoly-acid structure and the general formula:

Process for producing methacrylic acid

A catalyst having heteropoly-acid structure and the general formula:

Catalyst for use in a methacrylic acid process

Process for producing methacrylic acid and a catalyst

This invention relates to a process and catalyst for producing methacrylic acid by the oxidation of methacrolein. More specifically, it relates to a process for producing methacrylic acid from methacrolein by oxidizing the same with molecular oxygen or molecular oxygen-containing gas, which is characterized by the use of a composition, as a catalyst, having a heteropolyacid structure and the general formula:

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Gunma, Japan

Hideki Sugi