Mitsui Chemicals, Inc.

Mitsui Toatsu Chemicals, Incorporated

Daiichi Suntory Pharma Co., Ltd.

Teruo Muraishi

Ryuichiro Tsumura

Phala Heng

Akira Mizuno

Koji Inoue

Kazuto Sekiuchi

Michiaki Umeno

Takushi Nagata

Hirokazu Ikenaga

Keiichi Ideda

Jin-Kai Wang

Kunimitsu Fukumura

Ethylene is oligomerized with a catalyst in which nickel is supported on a support containing silica and alumina. The catalyst has little deterioration over long periods and affords oligomers with high productivity. The ethylene oligomerization catalyst includes a support and a nickel compound supported on the support, the support including silica and alumina, and the amount of nickel supported is in the range of 0.0001 to 1 wt % based on the weight of the support, and the molar ratio of silica to alumina in the support (SiO/AlO) is in the range of 100 to 2000. In a process of the invention, ethylene is oligomerized with use of the catalyst.

Ethylene oligomerization catalyst and use thereof

The invention provides methods for converting hydrocarbons as starting material by industrial fixed-bed reaction processes with a zeolite shaped catalyst which has a low content of inorganic binder and a high pore volume and which shows high catalytic activity, long catalyst life and high crushing strength. A zeolite shaped catalyst used in the methods of the invention includes zeolite and an inorganic binder and is obtained by kneading zeolite, a starting material of an inorganic binder, shaping auxiliary(ies), organic polymer particles having an average diameter of 0.1 to 6 &#x3bc;m and water into a kneaded product, and extruding, drying and calcining the kneaded product; and the zeolite shaped catalyst has a zeolite component content of not less than 60 wt % relative to the total weight, a pore volume of 0.4 to 1.0 ml/g, a half-volume pore diameter of 80 to 500 nm and a crushing strength of not less than 0.9 kg.

Method for converting hydrocarbons with zeolite shaped catalyst

Process for production of optically active pyrroloazepine derivatives

A process for the preparation of N-substituted maleimides by conducting heat-dehydration and dehydrating imidization of N-substituted maleamic acids under azeotropic distillation of generated water in a solvent mixture containing a solvent capable of forming water azeotrope and an organic aprotic polar solvent, in the presence as catalyst of a zinc salt of a maleamic acid, metallic zinc or a zinc compound which forms a zinc salt of the N-substituted maleamic acid in the reaction system.

Preparation process of N-substituted maleimides

A process for the preparation of N-substituted maleimides by conducting heat-dehydration and dehydrating imidization of N-substituted maleamic acids under azeotropic distillation of generated water in a solvent mixture containing a solvent capable of forming water azeotrope and an organic aproptic polar solvent, in the presence as catalyst of metallic tin, tin oxide, a tin salt of a maleamic acid or a tin compound which forms a thin salt of the N-substituted maleamic acid in the reaction system.

Preparation of N-substituted maleimides by use of tin catalysts

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Yokohama, Japan

Teruo Muraishi