Nippon Chemical Industrial Co., Ltd.

Kentaro Sasaki

Tadashi Saito

Yoshifusa Hara

Katsuhiko Tsunashima

There is provided a process capable of preventing the adhesion of a catalyst to an evaporator in a step of separating a chlorophosphite as a target substance from a reaction liquid by evaporation. The process includes a first step of allowing phosphorus trichloride and a phosphorous acid triester represented by (RO)P to react in the presence of a catalyst having a viscosity at 80&#xb0; C. of 100 mPa&#xb7;s or lower to produce a chlorophosphite represented by RO(R')PCl, and a second step of vaporizing a reaction liquid containing the chlorophosphite obtained in the first step, in a short time, to separate the catalyst.

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Tokyo, Japan

Kentaro Sasaki