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    • 3. 发明公开
    • 유산으로부터 락타이드의 제조방법
    • 一种从乳酸合成柠檬酸的方法
    • KR1020130099623A
    • 2013-09-06
    • KR1020120021266
    • 2012-02-29
    • 현대자동차주식회사서울대학교산학협력단
    • 홍채환김시환서지연한도석김영규김명학
    • C07D319/12B01J31/02
    • PURPOSE: A method for preparing lactide from lactic acid is provided to obtain high purity lactide with high yield, thereby lowering cost for producing polylactic acid. CONSTITUTION: A method for preparing lactide comprises the steps of: performing catalytic reaction of a lactic acid solution with water under the presence of a first organic solvent; performing phase separation of the product and forming a mixture of a second organic solvent and water; and extracting and evaporating the isolated organic part to obtain lactide. The lactic acid solution contains 10-98 % lactic acid. [Reference numerals] (AA) Lactic acid solution; (BB) Mixing lactic acid solution with xylene; (CC) Catalyst reacting with the mixture of lactic acid solution and xylene (reaction temperature: around 130°C); (DD) Mixing the reactant of the previous step, ethyl acetate and water; (EE) Separating organic phase part after extracting reaction and evaporating; (FF) Collecting solid phased lactide
    • 目的:提供从乳酸制备丙交酯的方法,以高产率获得高纯度丙交酯,从而降低生产聚乳酸的成本。 构成:制备丙交酯的方法包括以下步骤:在第一有机溶剂的存在下进行乳酸溶液与水的催化反应; 进行产物的相分离并形成第二有机溶剂和水的混合物; 并萃取并蒸发分离的有机部分以获得丙交酯。 乳酸溶液含有10-98%的乳酸。 (AA)乳酸溶液; (BB)将乳酸与二甲苯混合; (CC)催化剂与乳酸和二甲苯的混合物反应(反应温度:约130℃); (DD)混合前一步骤的反应物,乙酸乙酯和水; (EE)萃取反应并蒸发后分离有机相部分; (FF)收集固相化丙交酯