Ube Industries, Inc.

Yoichi Imbe

Katsumasa Harada

Shuji Tanaka

Keigo Nishihira

Ryoji Sugise

Koichi Kashiwagi

Takashi Doi

Satoru Fujitsu

Toshihiko Sumida

Masayuki Nishio

Hirofumi Ii

A catalyst composed of an organic phosphorus compound having a trivalent or pentavalent phosphorus atom and at least one carbon-phosphorus bonding or a combination of the organic phosphorus compound and a halogen atom-containing compound is effective for decarbonylation, that is, for releasing carbon monoxide from a compound containing a moiety of --CO--CO--O-- in its molecular structure.

Catalyst for decarbonylation reaction

A process for preparing a diaryl carbonate from a diaryl oxalate in a liquid phase by decarbonylation is conducted by the steps of:

Process for preparing diaryl carbonate

A diaryl carbonate is prepared at a high yield and a high selectivity by heating a diaryl oxalate in the presence of an organic phosphorous compound to release carbon monoxide therefrom. A halogen atom-containing compound can be employed in combination with the organic phosphorous compound.

Process for preparation of diaryl carbonate

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Yamaguchi, Japan

Yoichi Imbe