发明名称 |
METHOD FOR PRODUCING POLYLACTIC ACID |
摘要 |
<p>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.</p> |
申请公布号 |
EP2583989(A1) |
申请公布日期 |
2013.04.24 |
申请号 |
EP20110795807 |
申请日期 |
2011.06.16 |
申请人 |
HITACHI ZOSEN CORPORATION;TOHOKU ELECTRIC POWER CO., INC.;NATIONAL UNIVERSITY CORPORATION NAGOYA UNIVERSITY |
发明人 |
KISHIDA, HISANORI;HASEGAWA, TAKASHI;MIYAGUCHI, KENJI;MORIYA, TAKEHIKO;NOMURA, NOBUYOSHI;OGAWA, RYOHEI |
分类号 |
C08G63/08;C08G63/82;C08L101/16 |
主分类号 |
C08G63/08 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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