Ube Industries, Inc.

Hiroshi Yanagisawa

Haruhiko Miyazaki

Yasushi Shiomi

Katsuro Masunaga

Satoru Fujitus

Tetsuo Yamada

Koji Shibata

Disclosed is a powder of silicon nitride particles having a specific surface area of from 5 to 20 m.sup.2 /g. When an aqueous solution of a polyvinyl alcohol having a mean degree of polymerization of X and a degree of saponification of Y (mol %) is adsorbed to the powder, the amount of saturated adsorption at 20.degree. C. is not higher than the amount of adsorption to be represented by:

Silicon nitride powder and silicon nitride-containing aqueous slurry

In a process for preparing a diester of oxalic acid by the vapor phase catalytic reaction of carbon monoxide with an ester of nitrous acid in the presence of a catalyst composed of a solid carrier and a catalyst component supported on the carrier, the improvement wherein said catalyst component is composed of

Process for the production of a diester of oxalic acid

In a process for preparing a diester of oxalic acid by the vapor phase catalytic reaction of carbon monoxide with an ester of nitrous acid in the presence of a catalyst composed of a solid carrier and a platinum-group metal or a salt thereof supported on the carrier, the improvement wherein said solid carrier is alumina having a specific surface area of not more than 90 m.sup.2 /g.

Process for preparing oxalic acid diesters using platinum group metals

Process for the preparation of oxalic acid diesters

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Ube, Japan

Hiroshi Yanagisawa