Idemitsu Kosan Company, Limited

Nippon Coke & Engineering Company, Limited

Hiroaki Kezuka

Fumio Okuda

Nobuaki Shimizu

Osamu Ishikawa

Satoshi Shiina

In a pulverization/dispersion processing system using a medium agitating type wet pulverization/dispersion machine, a system capable of judging the progress of pulverization/dispersion processing successively and objectively during the pulverization/dispersion processing is provided. A pulverization/dispersion processing systemincluding a medium agitating type wet pulverization/dispersion machine, a holding tankof a material to be processed, a circulating pump, and circulating linesconnecting these components to each other is equipped with a particle size distribution measuring instrument and/or a zeta potential measuring instrumentin one of the circulating lines. These measuring instrumentsperform measurement by means of an ultrasonic wave, and can use an ultrasonic attenuation method or an electronkinetic sonic amplitude method.

Pulverization/dispersion processing system

A process for producing an organic carbonate which comprises reacting an organic hydroxy compound, carbon monoxide and oxygen in the presence of a catalyst comprising(a) palladium or a palladium compound, (b) a cuprous or cupric compound such as cupric acetate, (c) a quinone or an aromatic diol formed by reduction of the quinone or a mixture thereof such as hydroquinone, and (d) a halogenated onium compound such as (C.sub.4 H.sub.9)NBr is disclosed. According to the invention, an organic carbonate such as diphenyl carbonate can be produced efficiently and economically.

Process for producing an organic carbonate

A process for efficiently producing an organic carbonate which comprises reacting an organic hydroxy compound and carbon monoxide in the absence of oxygen and in the presence of a catalyst comprising (a) palladium or a palladium compound, (b) a quinone or an aromatic diol formed by reduction of the quinone or a mixture thereof, and (c) a halogenated onium compound is disclosed.

Process for producing an organic carbonate from an organic hydroxy

The present invention relates to a process for producing glycol monoesters by reacting carboxylic acid, olefin and oxygen in the presence of a catalyst containing (A) a palladium component, (B) an oxygen-containing nitrogen compound, and (C) a metal halide in the specified ratio of (A), (B), (C). According to the present invention, the regeneration of the catalyst through reduction is easy and the catalyst of high activity can be used repeatedly.

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Tochigi, Japan

Hiroaki Kezuka