Method for producing cyclic diesters of L-, D- and D,L-lactic acid
    1.
    发明授权
    Method for producing cyclic diesters of L-, D- and D,L-lactic acid 有权
    L-,D-和D,L-乳酸环状二酯的制备方法

    公开(公告)号:US08431678B2

    公开(公告)日:2013-04-30

    申请号:US12742361

    申请日:2008-11-14

    IPC分类号: C08G63/08

    CPC分类号: C07D319/12 C08G63/85

    摘要: Method for the production of L,L-, D,D-, D,L- and meso-dilactides, comprising the polycondensation and/or polytransesterification of an L-, D- or D,L-lactic acid or of esters thereof to polyesters of higher molecular weights of the L-, D- and D,L-lactic acid (polylactic acids) and cyclizing depolymerization of the polylactic acids to dilactides, wherein the polyesters of higher molecular weights of the L-, D- and D,L-lactic acids are produced in the presence of hydrolysis-stable metal compounds as catalyst.

    摘要翻译: 制备L,L-,D,D,D,L-和内消旋二酰胺的方法,包括将L-,D-或D,L-乳酸或其酯的缩聚和/或多酯交换反应至 L,D-和D,L-乳酸(聚乳酸)的较高分子量的聚酯和聚乳酸环化为解聚反应,其中L-,D-和D的较高分子量的聚酯, 在水解稳定的金属化合物作为催化剂的存在下生产L-乳酸。

    METHOD FOR PRODUCING CYCLIC DIESTERS OF L-, D- AND D,L-LACTIC ACID
    2.
    发明申请
    METHOD FOR PRODUCING CYCLIC DIESTERS OF L-, D- AND D,L-LACTIC ACID 有权
    用于生产L-,D-和D,L-柠檬酸的循环柴油的方法

    公开(公告)号:US20100331512A1

    公开(公告)日:2010-12-30

    申请号:US12742361

    申请日:2008-11-14

    IPC分类号: C08G63/08 C07D319/12

    CPC分类号: C07D319/12 C08G63/85

    摘要: Method for the production of L,L-, D,D-, D,L- and meso-dilactides, comprising the polycondensation and/or polytransesterification of an L-, D- or D,L-lactic acid or of esters thereof to polyesters of higher molecular weights of the L-, D- and D,L-lactic acid (polylactic acids) and cyclizing depolymerization of the polylactic acids to dilactides, wherein the polyesters of higher molecular weights of the L-, D- and D,L-lactic acids are produced in the presence of hydrolysis-stable metal compounds as catalyst.

    摘要翻译: 制备L,L-,D,D,D,L-和内消旋二酰胺的方法,包括将L-,D-或D,L-乳酸或其酯的缩聚和/或多酯交换反应至 L,D-和D,L-乳酸(聚乳酸)的较高分子量的聚酯和聚乳酸环化为解聚反应,其中L-,D-和D的较高分子量的聚酯, 在水解稳定的金属化合物作为催化剂的存在下生产L-乳酸。

    PARTICULATE CATALYST AND CATALYST/STABILIZER SYSTEMS FOR PRODUCING HIGH-MOLECULAR-WEIGHT HOMOPOLYESTERS AND COPOLYESTERS OF L-, D- OR D,L-LACTIC ACID
    3.
    发明申请
    PARTICULATE CATALYST AND CATALYST/STABILIZER SYSTEMS FOR PRODUCING HIGH-MOLECULAR-WEIGHT HOMOPOLYESTERS AND COPOLYESTERS OF L-, D- OR D,L-LACTIC ACID 审中-公开
    用于生产L-,D-或D,L-柠檬酸的高分子量重均分子和共聚物的颗粒催化剂和催化剂/稳定剂体系

    公开(公告)号:US20100317797A1

    公开(公告)日:2010-12-16

    申请号:US12742185

    申请日:2008-11-14

    CPC分类号: C08G63/823

    摘要: The invention relates to a method for the production of high-molecular homo- and Copolyesters of L-, D- and D,L-lactic acids that comprises the process steps of i) the polycondensation of a lactic acid or polytransesterification of esters thereof to a polymeric lactic acid, ii) the cyclizing depolymerization of the polymeric lactic acid to dilactides, and iii) the ring-opening polymerization of the dilactides or mixtures thereof with suitable comonomers, characterized in that in at least one of the process steps i) to iii), a particulate catalyst and/or a particulate stabilizer, each having an average particle diameter of 1 to 100 nm, is/are used in a heterogeneous reaction mixture.

    摘要翻译: 本发明涉及一种用于生产L-,D-和D,L-乳酸的高分子同型物和共聚酯的方法,其包括以下工艺步骤:i)将乳酸缩聚或其酯的多酯交换与 聚合乳酸,ii)将聚合乳酸环化为解聚反应,和iii)所述稀释剂或其混合物与合适的共聚单体的开环聚合,其特征在于在至少一个工艺步骤i)至 iii)中,平均粒径为1〜100nm的颗粒状催化剂和/或微粒稳定剂用于非均相反应混合物中。

    Process for the preparation of anhydrous trisodium citrate
    4.
    发明授权
    Process for the preparation of anhydrous trisodium citrate 失效
    无水柠檬酸三钠的制备方法

    公开(公告)号:US5929276A

    公开(公告)日:1999-07-27

    申请号:US55470

    申请日:1998-04-06

    IPC分类号: C07C51/41 C07C59/265

    CPC分类号: C07C51/41

    摘要: The invention relates to a process for producing anhydrous trisodium citrate the structure of which is unchanged as compared to a crystalline hydrate form, the anhydrous trisodium citrate, as well as its use as a carrier for inorganic and/or organic substances, in particular after being impregnated with liquids.

    摘要翻译: 本发明涉及一种生产无水柠檬酸三钠的方法,其结构与结晶水合物形式,无水柠檬酸三钠相比不变,以及其作为无机和/或有机物质载体的用途,特别是在 用液体浸渍。