Jfe Chemical Corporation

Youko Sugio

Hiroaki Mori

Tetsuo Hachiya

Naoyuki Kitamura

A process is provided for the production of 2,7-dibromofluorenone. According to the process, a 2,7-dibromofluorene-contianing raw material is oxidized with molecular oxygen in the presence of a phase transfer catalyst such as a quaternary ammonium salt in a heterogeneous, mixed solvent of an aqueous solution of a caustic alkali and a water-insoluble organic solvent. Crude crystals of 2,7-dibromofluorenone, which have been obtained by the oxidization, can be purified by recrystallization to recover 2,7-dibromofluorenone as crystals having a purity of at least 99 wt. %.

Production process of 2,7-dibromofluorenone

Indene is produced from an indene-containing coal tar distillate by adding a glycol to the indene-containing coal tar distillate and then conducting azeotropic distillation to obtain an indene fraction while eliminating benzonitrile from the indene-containing coal tar distillate.

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Tokyo, Japan

Youko Sugio