Mitsubishi Gas Chemical Company, Inc.

Kengo Tsukahara

Masao Saito

Shuji Ebata

Yuzi Onda

Yoshinori Kanamori

Toshio Koseki

Noriko Takahashi

Takeshi Otake

Yoshiaki Yamamoto

Yasushi Hiramatsu

Koichiro Yamada

Hisasi Imai

As catalysts for producing aromatic amines by hydrogenating aromatic nitrites, there are disclosed (1) the catalyst comprising a metal catalyst component comprising Ni and/or Co and a specific amount of zirconia as a carrier component, which is prepared by drying, calcining and forming a precipitate produced by adding an aqueous solution containing soluble salts of the metal catalyst component and the carrier component to an aqueous alkali solution; and (2) the catalyst comprising the metal catalyst component and the carrier component, which is prepared by filtering a precipitate produced by adding an aqueous solution containing soluble salts of the metal catalyst component and the carrier component to an aqueous alkali solution; forming the precipitate without drying to obtain a formed product; and subjecting the formed product to drying and then calcining. These catalysts are free from breaking owing to rapid generation of methane and evaporation of liquid ammonia by hydrogenolysis of high boiling by-products of the hydrogenation when reactivated after deactivation of the catalyst, which allows the long-term use of the catalysts.

Catalysts and process for producing aromatic amines

A di(aminomethyl)-substituted aromatic compound is produced by a two-stage hydrogenation. In the first stage, an aromatic dinitrile is hydrogenated into a cyano(aminomethyl)-substituted aromatic compound in the presence of a Pd-containing catalyst. The resultant cyano(aminomethyl)-substituted aromatic compound is then hydrogenated in the second stage into the target di(aminomethyl)-substituted aromatic compound in the presence of a Ni- and/or Co-containing catalyst. By the above method, the di(aminomethyl)-substituted aromatic compound is produced in a high selectivity and a sufficiently high yield without reducing the catalyst life.

High-selective production method of di(aminomethyl)-substituted aromatic compound

A process for producing hydrogen cyanide by reacting methane or a gas containing methane as a main component, ammonia and an oxygen-containing gas in the presence of a platinum-containing catalyst, wherein the reaction gases are quenched by using an indirect heat-exchanger, preferably made of a nickel alloy having an iron content of not more than 4.0% by weight, without quenching them directly with water.

Apparatus for use in producing hydrogen cyamide

The present invention relates to a catalyst which comprises a vanadium oxide, a chromium oxide, a molybdenum oxide and a boron oxide supported on a silica carrier. This catalyst is suitable for use in the production of aromatic nitriles from alkyl-substituted aromatic compound by the catalytic reaction of a gas mixture containing an alkyl-substituted aromatic compound, ammonia and oxygen or a gas containing molecular oxygen over a catalyst. The present invention further relates to a process for producing the aromatic nitriles using said catalyst.

Catalyst for producing aromatic nitriles

Catalyst and process for producing aromatic nitriles

A process for producing hydrogen cyanide which comprises reacting methane or a gas containing methane as a main component, ammonia and an oxygen-containing gas in the presence of a platinum-containing catalyst, wherein the reaction gases are quenched by using an indirect heat-exchanger, preferably an indirect heat-exchanger made of a nickel alloy having an iron content of not more than 4.0% by weight, without quenching them directly with water.

Process for producing hydrogen cyanide and appartus for use in the

A process for producing a cyanopyridine which comprises reacting the corresponding methylpyridine, ammonia and an oxygen-containing gas in the presence of a catalyst comprising a vanadium oxide, a chromium oxide, a boron oxide and optionally a phosphorus oxide and/or molybdenum oxide held on silica is disclosed. According to the present invention, the reactivity of the raw material and the yield of the reaction product are high.

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Niigata, Japan

Kengo Tsukahara