Nippon Kayaku Kabushiki Kaisha

Nippon Kayaku Co., Ltd

Yoshimasa Seo

Hideki Sugi

Atsushi Sudo

Kazuo Shiraishi

Fumio Sakai

Koichi Wada

Toshitake Kojima

Akira Iwamoto

Mutsumi Matsumoto

Tatsuhiko Kurakami

Hiroyoshi Nowatari

Tomoaki Kobayashi

Masahiro Senyo

Atsushi Umejima

Hideaki Miki

Junzo Ohishi

Atsusi Sudo

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

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

An object of the present invention is to provide a highly active catalyst for producing an unsaturated oxygen-containing compound from an alkane and the catalyst comprising Mo, V, Ti and Sb or Te as the indispensable active components. The preferable catalyst is represented by formula (1) or (2) as shown below,MoVTiXYO&#x2003;&#x2003;(1)MoVTiXYZO&#x2003;&#x2003;(2)wherein X represents Sb or Te; Y represents Nb, W or Zr; Z represents Li, Na, K, Rb, Cs, Mg, Ca or Sr; a, b, c, d, e and f represent atomic ratios of their respective elements, with 0&#x3c;a&#x3c;0.7, 0&#x3c;b&#x3c;0.3, 0&#x3c;c&#x3c;0.7, 0&#x2266;d&#x3c;0.3, 0&#x3c;f&#x3c;0.1; e is a number determined by oxidation states of the other elements than oxygen.

Catalyst for oxidation of alkane, process for preparing thereof and process for producing unsaturated oxygen-containing compound

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

Producing acrolein and acrylic acid using a supported dual activity

Catalysts and process for the preparation thereof

A catalyst for the production of unsaturated aldehyde and unsaturated acid, obtained by loading a catalytically active component on a carrier and calcining the loaded catalyst, characterized by an average particle diameter of the catalyst of 4 to 16 mm, an average particle diameter of the carrier of 3 to 12 mm, a calcining temperature of 520 to 600.degree. C. and an amount of the catalytically active component loaded on the carrier of 5 to 80% by weight �weight of the catalytically active component)/(weight of the catalytically active component+weight of the carrier+weight of a strength improver)!, and a process for producing unsaturated aldehyde and unsaturated acid with the catalyst.

Catalyst and process for producing unsaturated aldehyde and unsaturated

The present invention relates to a process for producing methacrylic acid by oxidizing methacrolein in vapor phase with molecular oxygen or a gas containing molecular oxygen, characterized in that the oxidation is carried out in the presence of a catalyst having a composition shown by the following formula:

Process for producing methacrylic acid and a catalyst

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Takasaki, Japan

Yoshimasa Seo