Mitsui Chemicals, Inc.

Mitsunaga Douzaki

Kouji Maeba

Osamu Hososaka

An apparatus for continuously producing polyisocyanate is provided for quickly contacting polyamine and carbonyl chloride in order to suppress an undesirable reaction between polyamine and polyisocyanate so that a by-product can be reduced and the yield of polyisocyanate can be improved. In a circulatory line, a material-mixing portion, a high-shear pump, a reactor, a liquid-feeding pumpand a coolerare interposed in series along the direction of the flow of a reaction solution, thereby forming a closed line. In this apparatus, after polyamine and carbonyl chloride are supplied in the material-mixing portion, the reaction solution is sheared by the high-shear pumpin a state where the contact of the polyamine with the reaction solution is minimized. Thus, the formation of a urea compound as a by-product can be suppressed and the yield of polyisocyanate can be improved.

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Kamisu, Japan

Mitsunaga Douzaki