Mitsubishi Chemical Industries Limited

Mitsubishi Kasei Corporation

Akio Tamaru

Yoshiaki Izumisawa

Hidekichi Hashimoto

Kiyoji Kuma

Takeshi Okano

Yoshio Kinsho

Yoshikazu Ohshima

Tokuzo Kurata

Yoshifumi Murata

Kunihiko Ohfuchi

Minoru Kitsunai

Takayuki Yoshida

Takashi Komaya

Koushi Honda

Saburo Nagashima

Masanobu Minagawa

A catalyst for conversion of carbon monoxide in water gas reaction, which comprises iron oxide, chromium oxide and magnesium oxide in the proportions of the from 40 to 85% by weight computed as Fe.sub.2 O.sub.3, from 12 to 45% by weight computed as Cr.sub.2 O.sub.3 and from 3 to 15% by weight computed as MgO, respectively.

Catalyst for conversion of carbon monoxide

The present invention provides a process of preparing terephthalic acid of high quality which is characterized by:

Process for preparing terephthalic acid of high quality

A process for producing an orthoalkylphenol which comprises reacting phenol with an olefin in a liquid phase in the presence of an alumina catalyst, characterized in that the water content in the liquid phase of the reaction system is maintained at a level of not higher than 250 ppm.

Process for producing orthoalkylphenols

There is disclosed a process for preparing cyclohexanone by catalytic dehydrogenation of cyclohexanol, which comprises conducting the dehydrogenation in the presence of a copper-chromium catalyst derived from a mixture of copper oxide and chromium oxide having an atomic ratio of copper to chromium between 8:2 and 2:8, said mixture being subjected to heat treatment at a temperature of 650.degree. to 900.degree. C. in a non-reducing atmosphere and to subsequent reduction to provide the desired catalyst.

Process for the preparation of cyclohexanone

In a process for producing tantalum concentrates from ores containing tantalum oxides, tantalic acid or its salts together with rutile type titanium dioxide in mixed crystals, the ores are treated in a sulfuric acid of a concentration not lower than 50% by weight with heating at a temperature from 200.degree. C. to the boiling point of said sulfuric acid, and then the above-treated products are treated with a reducing agent in an aqueous solution of sulfuric acid of a concentration lower than 50% by weight to dissolve the titanium component to thereby obtain tantalum concentrates as solid products.

Process for producing tantalum concentrates

A copper catalyst obtained by reducing a copper compound with formaldehyde in the presence of an alkali in an aqueous medium is an excellent catalyst for the hydrolysis of an unsaturated nitrile to an amide. Furthermore, when a copper compound is combined with another element, which is selected from a specific group of elements, during the preparation of the copper catalyst, a catalyst is formed which has an increased hydrolysis activity and an increased catalyst lifetime.

Process for hydrating an unsaturated nitrile

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Kitakyushu, Japan

Akio Tamaru