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    • 3. 发明申请
    • METHOD FOR PRODUCING POLYLACTIC ACID
    • 生产聚酸的方法
    • US20130178598A1
    • 2013-07-11
    • US13704793
    • 2011-06-16
    • Hisanori KishidaTakashi HasegawaKenji MiyaguchiTakehiko MoriyaNobuyoshi NomuraRyohei Ogawa
    • Hisanori KishidaTakashi HasegawaKenji MiyaguchiTakehiko MoriyaNobuyoshi NomuraRyohei Ogawa
    • C08G63/84
    • C08G63/84C08G63/08C08G63/82C08G63/823C08L101/16
    • 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.
    • 为了提供能够制备立体络合物聚乳酸的方法,该方法能够使用与诸如糖类之类的食品不具有竞争力的碳中和材料,而不需要使用设计光学拆分的方法,这需要复杂的操作和高成本, 难以进行批量生产。 本发明的制造方法包括:使甘油与氢氧化钠在高温高压水中反应生成外消旋乳酸钠水溶液的工序; 从外消旋乳酸钠水溶液中分离钠以回收外消旋乳酸的步骤; 使外消旋乳酸二聚以产生含有内消旋丙交酯和外消旋丙交酯的丙交酯混合物的步骤; 从混合物中分离内消旋丙交酯以回收外消旋丙交酯的步骤; 以及将外消旋丙交酯与作为催化剂的盐金属络合物聚合以制备立体络合物聚乳酸的步骤。
    • 6. 发明授权
    • Hydrothermal reaction apparatus
    • 水热反应装置
    • US5843386A
    • 1998-12-01
    • US631812
    • 1996-04-10
    • Hisaaki MakinoTakehiko MoriyaYoshihisa SaitoMasazumi Kanazawa
    • Hisaaki MakinoTakehiko MoriyaYoshihisa SaitoMasazumi Kanazawa
    • B01J3/00B01J3/02B01J3/04B01J19/00B01J19/24C10B53/00C10G1/10
    • B01J3/04B01J19/243C10B53/00C10G1/10B01J2219/0002B01J2219/00083B01J2219/00094
    • A safe and efficient hydrothermal reaction apparatus is described herein. Decomposition or synthesis of object material is performed by the continuous passing of the material through a flow passage of multi-staged reactor units under turbulent flow conditions. The flow passage is formed by a curved or spiral piping. In each reactor unit, a hot plate block is included as a heating unit. The hot plate block and the curved piping are placed in an appropriate thermal contact relationship. A portion of the curved piping is freely supported, so as to accommodate stress caused in the piping under high-temperature/high-pressure conditions. A tank is provided for regulating or controlling the pressure fluctuation within the flow passage which may be caused by solids or powder present or occurring in the flow passage during high-pressure treatment. A portion of object material which has not been decomposed during the high-pressure treatment is again introduced or returned to the reactor for complete decomposition thereof after the addition of more solvent.
    • 这里描述了一种安全有效的水热反应装置。 目标材料的分解或合成是通过在湍流条件下连续通过多级反应器单元的流动通道进行的。 流动通道由弯曲或螺旋管道形成。 在每个反应器单元中,包括热板块作为加热单元。 热板块和弯曲管道放置在适当的热接触关系中。 弯曲管道的一部分自由地支撑,以适应在高温/高压条件下在管道中产生的应力。 提供一个罐,用于调节或控制流道内的压力波动,这可能是由在高压处理期间存在或发生在流路中的固体或粉末造成的。 在加入更多的溶剂之后,将高压处理中尚未分解的物料的一部分再次引入或返回到反应器中以使其完全分解。