Tosoh Corporation

Motohiro Oguri

Takanori Miyake

Hideyuki Mimura

Fumio Okisaki

Toshihide Yamamoto

Toru Yoshida

Yoshihiko Mori

Tetsuo Asakawa

Hisanori Okada

Hideyuki Murakita

Ryuji Ikeda

Shinya Imatomi

Tomokazu Ohashi

Hideyuki Hamaji

Sae Someya

Hideyuki Niwa

Michiyuki Hamada

To provide a heterogeneous catalyst that exhibits high activity and high selectivity, specifically a catalyst suitable for oxychlorination to produce 1,2-dichloroethane from ethylene, and a catalyst system. Provided are: a heterogeneous catalyst supported on a porous carrier, characterized in that the integral value of the hysteresis occurring between an adsorption isotherm and a desorption isotherm by a gas adsorption method, is at most 19% to the total integral value of the adsorption isotherm; and a catalyst system for producing 1,2-dichloroethane, which comprises this catalyst and a diluent having a spherical shape, circular cylindrical shape or hollow cylindrical shape.

Heterogeneous catalyst and catalyst system for producing 1,2-dichloroethane

A novel poly(arylene ether sulfone) having a sulfoalkoxy group, which has both of heat resistance and electroconductivity, is suitable as polymer electrolyte membranes used for high performance polymer electrolyte fuel cells, and does not use fluorine so that loads to the environment are small in the synthesis or disposal, a process of producing the same, and a polymer electrolyte membrane comprising the same. The poly(arylene ether sulfone) having a sulfoalkoxy group has a structural unit represented by the formula (1) mentioned hereinabove, and is produced by reacting a poly(arylene ether sulfone) having a hydroxyl group with a specific alkali metal compound and/or an organic base compound, followed by reacting with a specific sulfonating agent and then with a specific acid. A polymer electrolyte membrane is produced by film formation of the polymer.

Poly (arylene ether sulfone) having sulfoalkoxy group, process of producing the same, and polymer electrolyte membrane comprising the same

A catalyst for trimerization of ethylene is disclosed which comprises (a) a chromium complex having a neutral multidentate ligand having a tripod structure, represented by the formula, ACrJ Q wherein A is a neutral multidentate ligand having a tripod structure, J is a carbonyl ligand or halogen, n is an integer of 0-3, and Q is at least one member selected from hydrogen, a C -C hydrocarbon group, a C -C carboxylate group, a C -C diketonato group, an amide group, an imide group, an C -C alkoxide group, a C -C thioalkoxide group, an C -C arene ligand, an C -C alkene ligand, an C -C alkyne ligand, an amine ligand, an imine ligand, an isonitrile ligand, a phosphine ligand, a phosphine oxide ligand, a phosphite ligand, an ether ligand, a sulfide ligand, a sulfone ligand and a sulfoxide ligand, and (b) a metal alkyl compound. The catalyst optionally further comprises (c) at least one compound selected from aromatic tertiary amine compounds, except for an imine, and nitrogen-containing heterocyclic compounds, and (d) a radical anion compound.

Catalyst for trimerization of ethylene and process for trimerizing ethylene using the catalyst

A phenol is produced by reacting an aromatic compound with oxygen and hydrogen in the liquid phase in the presence of a catalyst comprising a noble metal of group VIII of the periodic table, which is supported on a carrier, and in the co-presence of a vanadium compound. The reaction is carried out either (i) by using as the catalyst a catalyst containing 0% to 0.15% by weight, based on the weight of the catalyst, of halogens, or (ii) further in the co-presence of a diketone compound of the following formula (1) or (2): ##STR1## wherein R.sup.1 and R.sup.2 independently represents an aryl or alkyl group, which group may have a substituent, ##STR2##

Process for producing phenols

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Yokkaichi, Japan

Motohiro Oguri