Mitsubishi Chemical Corporation

Hisashi Nagahama

Haruhiko Kusaka

Ryo Yamashita

Takanori Taniguchi

Seijiro Nishimura

Youko Nakagawa

Daisuke Hirooka

The present invention relates to a method for producing tetrahydrofuran, comprising feeding 1,4-butanediol to a reactor and performing a cyclodehydration reaction in the presence of an acid catalyst to obtain tetrahydrofuran, in which a water concentration in a in-reactor liquid phase is within a range of 1.4 to 10 wt %.

Method for producing tetrahydrofuran

A process for producing a polyurethane, which comprises using a polyester polyol (a-1), a polyether polyol (b), an isocyanate compound (c) and a chain extender (d) as a raw material to produce a polyurethane, wherein the polyester polyol (a-1) is a polyester polyol (a-1) obtained by forming an ester bond between either a carboxyl group of a polycarboxylic acid (i-1) having a polysiloxane framework and a plurality of carboxyl groups or an ester group of a polycarboxylic acid ester (i-2) having a polysiloxane framework and a plurality of ester groups, and a hydroxyl group of a polyether polyol (ii).

Polyester polyol, polyurethane, obtained using the same, process for production thereof, and molded polyurethane

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Mie, Japan

Hisashi Nagahama