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1. 发明申请

WO2012148108A3 METHOD FOR PREPARING LACTIDE FROM ALKYL LACTATE 审中-公开
标题翻译：从阿尔茨海藻制备柠檬酸的方法
公开(公告)号：WO2012148108A3
公开(公告)日：2013-03-21
申请号：PCT/KR2012002869
申请日：2012-04-16
申请人： KOREA RES INST CHEM TECH , CHANG JONG SAN , HWANG DONG WON , LEE JUNG HO , HWANG YOUNG KYU , LEE U HWANG
发明人： CHANG JONG SAN , HWANG DONG WON , LEE JUNG HO , HWANG YOUNG KYU , LEE U HWANG
IPC分类号： C12P7/56 , C07C55/28 , C07C59/08 , C12P7/40
CPC分类号： C07C51/09 , C07C67/08 , C12P7/56 , C07C59/08 , C07C69/68
摘要： The present invention relates to a method for preparing lactide from alkyl lactate, comprising: a step of polymerizing alkyl lactate under a lead (Pb)-based catalyst so as to prepare lactic acid oligomers; and a step of depolymerizing said lactic acid oligomers to obtain lactide. The method of the present invention may use alkyl lactate, prepared by an esterification reaction between a fermented lactic acid solution and alcohol, directly without a separate dehydrating process such as moisture adsorption or pervaporation using zeolite, thus simplifying processes. In addition, the method of the present invention eliminates the necessity of additional hydrolysis for preparing lactic acid after the preparation of alkyl lactate, which might otherwise be required to prepare lactide. Further, the method of the present invention has the advantage of preparing lactide at a lower temperature than that of existing methods in which lactide is prepared after lactic acid is obtained by hydrolysis.
摘要翻译：本发明涉及一种从乳酸烷基酯制备丙交酯的方法，包括：在一种基于铅（Pb）的催化剂下聚合乳酸烷基酯以制备乳酸低聚物的步骤; 和解聚乳酸低聚物以获得丙交酯的步骤。本发明的方法可以直接使用通过发酵乳酸溶液和醇之间的酯化反应制备的乳酸烷基酯，而不需要采用沸石分离的脱水方法如水分吸附或渗透蒸发，从而简化了工艺。此外，本发明的方法消除了在制备乳酸烷基酯之后制备乳酸的额外水解的必要性，否则可能需要制备丙交酯。此外，本发明的方法具有在比通过水解获得乳酸后制备丙交酯的现有方法低的温度下制备丙交酯的优点。

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