Tokuyama Corporation

Tokuyama Soda Kabushiki Kaisha

Nippon Furnace Kogyo Kaisha, Ltd.

Hidetaka Miyazaki

Yusuke Izumi

Shin-ichi Kawahara

Toshiaki Hasegawa

Hiroyuki Yanagi

Susumu Mochida

Teruhiko Nawata

Yoshihiko Kajimoto

Shinichi Nitta

Harumasa Ito

Isao Yamaga

A single crystal pulling apparatus for a metal fluoride comprising a crucible provided in a chamber for filling with a molten solution of a single crystal material, a melting heater provided to surround the crucible, a vertically movable single crystal pulling bar for attaching a seed crystal on a tip thereof for coming in contact with the molten solution of the single crystal material in the crucible, a heat insulating wall provided in the chamber to surround at least a peripheral side portion of a single crystal pulling region in an upper part of the crucible, a ceiling board for closing an opening portion of an upper end in an upper part of the heat insulating wall, and a single crystal pulling chamber surrounded by the heat insulating wall and the ceiling board, wherein the ceiling board is provided with at least an inserting hole for inserting the single crystal pulling bar, and wherein a coefficient of thermal conductivity in a direction of a thickness of the ceiling board is 1000 to 50000 W/m&#xb7;K.

Single crystal pulling apparatus for a metal fluoride

A process for the production of allyl chloride, which comprises introducing propylene and chlorine into a reactor having at least one propylene-injection opening and at least one chlorine-injection opening, these openings being independent of each other, through the respective injection openings, and reacting them in a vapor phase, wherein propylene and chlorine are introduced into the reactor by injecting them in almost the same direction from the propylene-injection opening and the chlorine-injection opening which is closest to said propylene-injection opening, with a linear velocity in the propylene-injection opening, calculated as a value of at 300.degree. C. and 1 kg/cm.sup.2.G, of 100 m/sec or higher and a linear velocity of the chlorine-injection opening, calculated as a value of at 100.degree. C. and 1 kg/cm.sup.2.G, of 70 m/sec or higher, and the propylene-injection opening and the chlorine-injection opening are situated to meet the following expression (1),

Process and device for production of allyl chloride

In a process for preparing hydrogen peroxide by reacting hydrogen with oxygen in the presence of a catalyst in an aqueous medium containing hydrogen peroxide, the improvement which comprises using an aqueous medium which contains dissolved hydrogen and a platinum-group catalyst having adsorbed thereto hydrogen.

Process for producing hydrogen peroxide

A process for preparing hydrogen peroxide which comprises reacting hydrogen with oxygen in an aqueous medium containing a platinum-group catalyst, characterized in that the partial pressure of hydrogen and the partial pressure of oxygen in the gaseous phase of the reaction system are maintained at at least 0.5 atmosphere and at least 1.0 atmosphere respectively, and the platinum group catalyst is caused to be present in an amount, calculated as metal, of at least a minimum effective catalytic amount up to 30 mg per 100 ml. of said aqueous medium.

Process for preparing hydrogen peroxide

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Tokuyama, Japan

Hidetaka Miyazaki