发明名称 |
METHOD FOR PRODUCING LACTIC ACID AND METHOD FOR PRODUCING POLYLACTIC ACID |
摘要 |
Lactic acid obtained by a method for producing lactic acid, the method comprising: (A) a step of continuous fermentation wherein a fermentation culture medium of a microorganism having an ability of lactic acid fermentation is filtered through a porous membrane having an average pore size of not less than 0.01 µm and less than 1 µm with a transmembrane pressure difference within the range of 0.1 to 20 kPa, and the permeate is collected, while retaining the non-permeated liquid in or returning the non-permeated liquid to the culture, and adding a fermentation feedstock to the culture; (B) a step of filtering the permeate obtained in Step (A) through a nanofiltration membrane; and (C) a step of distilling the permeate obtained in Step (B) under a pressure of not less than 1 Pa and not more than atmospheric pressure, at 25°C to 200°C to recover lactic acid; comprises only small amounts of impurities, and a polylactic acid obtained using the lactic acid as a raw material has excellent thermal stability, mechanical strength and hue. |
申请公布号 |
EP2374895(A4) |
申请公布日期 |
2013.03.06 |
申请号 |
EP20090835018 |
申请日期 |
2009.12.25 |
申请人 |
TORAY INDUSTRIES, INC. |
发明人 |
SAWAI, KENJI;SAWAI, HIDEKI;MIMITSUKA, TAKASHI;ITO, MASATERU;YAMADA, KATSUSHIGE;KAWAMURA, KENJI;MINEGISHI, SHIN-ICHI;NAKAGAWA, IZUMI;NAGANO, TATSUYA |
分类号 |
C07C51/42;C07C59/08;C08G63/06;C08G63/08;C12P7/56 |
主分类号 |
C07C51/42 |
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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