Nagoya University

Hitachi Zosen Corporation

Tohoku Electric Power Company, Inc.

Ryohei Ogawa

Takashi Hasegawa

Takehiko Moriya

Hisanori Kishida

Nobuyoshi Nomura

Kenji Miyaguchi

To provide a method capable of producing stereocomplex polylactic acid, the method being capable of using carbon neutral materials that are not competitive from foods, such as saccharides, without the use of a method for designing optical resolution, which requires complicated operations and high cost and is difficult to perform mass production. The production method of the present invention comprises: a step of reacting glycerin with sodium hydroxide in high-temperature and high-pressure water to produce a racemic sodium lactate aqueous solution; a step of separating sodium from the racemic sodium lactate aqueous solution to recover racemic lactic acid; a step of dimerizing the racemic lactic acid to produce a lactide mixture containing meso lactide and racemic lactide; a step of separating meso lactide from the mixture to recover racemic lactide; and a step of polymerizing the racemic lactide with a salen-metal complex as a catalyst to produce stereocomplex polylactic acid.

Method for producing polylactic acid

Growing community of inventors

Nagoya, Japan

Ryohei Ogawa