Kabushiki Kaisha Kobe Seiko Sho

Shimadzu Corporation

Eiichi Kawada

Hiroshi Maeda

Kunihiko Shimizu

Masahiro Ito

Koji Yamamoto

Kazuhisa Fujisawa

Hitomi Ohara

Seiji Sawa

Yasuhiro Fujii

Yuji Kurishiro

Yutaka Miyakawa

A method and system for producing poly(lactic acid) enable trapping and recovering of lactide vapor discharged from a reaction vessel without requiring a solvent or the like. In the method and system, lactide vapor is discharged from a polymerization reaction vessel in which poly(lactic acid) is produced by ring-opening polymerization, and trapped by solidification. The solidified lactide is liquefied by heat. Lactide can be recovered more easily and assuredly.

Method and system for producing poly (lactic acid)

The present invention provides a method capable of continuously efficiently producing a 2-hydroxycarboxylic acid oligomer while effectively removing the water contained in a raw material and the water produced by dehydration reaction. In production of a 2-hydroxycarboxylic acid oligomer by supplying a 2-hydroxycarboxylic acid to a reaction system, a dehydration system is provided between a raw material supply system and a polymerization reaction system so as to remove the water contained in the raw material and the water produced in the polymerization reaction system. As a result, the raw material in the dehydration system is concentrated and then supplied to the polymerization reaction system.

Apparatus and method for producing 2-hydroxycarboxylic acid oligomer

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Tokyo, Japan

Eiichi Kawada