Production of polytrimethylene ether glycol and copolymers thereof
    3.
    发明授权
    Production of polytrimethylene ether glycol and copolymers thereof 有权
    聚三亚甲基醚二醇的制备及其共聚物

    公开(公告)号:US06977291B2

    公开(公告)日:2005-12-20

    申请号:US09738688

    申请日:2000-12-15

    IPC分类号: C07C41/09 C08G65/34

    摘要: A process for the manufacture of polytrimethylene ether glycol comprising the steps of: (a) providing (1) 1,3-propanediol reactant selected from the group consisting of 1,3-propanediol and/or oligomers or prepolymers of 1,3-propanediol having a degree of polymerization of 2-9 and mixtures thereof, and (2) a polycondensation catalyst; and (b) polycondensing the 1,3-propanediol reactant to form a polytrimethylene ether glycol at less than one atmosphere pressure, and the product of the process. In addition, polytrimethylene ether glycol has a number average molecular weight greater than 1,500, an APHA color of less than 120, an unsaturation of less than 20 meq/kg, and a content of cyclic ether oligomers of less than 2%.

    摘要翻译: 一种制备聚三亚甲基醚二醇的方法,包括以下步骤:(a)提供(1)选自1,3-丙二醇和/或低聚物或1,3-丙二醇预聚物的1,3-丙二醇反应物 具有2-9的聚合度及其混合物,和(2)缩聚催化剂; 和(b)缩聚1,3-丙二醇反应物以在小于一个大气压下形成聚三亚甲基醚二醇,以及该方法的产物。 此外,聚三亚甲基醚二醇的数均分子量大于1500,APHA颜色小于120,不饱和度小于20meq / kg,环醚低聚物的含量小于2%。

    METHODS FOR PREPARING 2,5-FURANDICARBOXYLIC ACID
    5.
    发明申请
    METHODS FOR PREPARING 2,5-FURANDICARBOXYLIC ACID 有权
    制备2,5-FURANDICARBOXYLIC酸的方法

    公开(公告)号:US20140295508A1

    公开(公告)日:2014-10-02

    申请号:US14229388

    申请日:2014-03-28

    IPC分类号: C07D307/68

    CPC分类号: C07D307/68

    摘要: Provided are methods of producing 2,5-furandicarboxylic acid (FDCA) from renewable sources such as seaweed, alginate, oligoalginate, pectin, oligopectin, polygalacturonate, galacturonate, and/or oligogalacturonate. The sugars in the renewable sources can be converted into one or more intermediates such as 4-deoxy-L-erythro-5-hexoseulose uronate (DEHU), 4-deoxy-L-threo-5-hexosulose uronate (DTHU), 5-hydroxymethyl furfural (HMF), 2,5-dihydroxymethyl furan (DHMF), and 5-formyl-2-furancarboxylic acid (FFA), which can be converted into FDCA by dehydration and cyclization to produce 5-formyl-2-furancarboxylic acid (FFA), followed by oxidation to produce FDCA. DEHU or DTHU may also be converted into FDCA by oxidation to produce 2,3-dihydroxy-5-oxohexanedioic acid (DOHA), which then undergoes dehydration and cyclization to produce FDCA.

    摘要翻译: 提供从可再生来源例如海藻,藻酸盐,低聚海藻酸盐,果胶,寡聚糖蛋白,聚半乳糖醛酸盐,半乳糖醛酸盐和/或寡聚半乳糖醛酸盐生产2,5-呋喃二羧酸(FDCA)的方法。 可再生资源中的糖可以转化为一种或多种中间体,例如4-脱氧-L-赤式5-己糖糖酸糖(DEHU),4-脱氧-L-苏糖-5-己糖糖酸糖(DTHU),5- 羟基甲基糠醛(HMF),2,5-二羟甲基呋喃(DHMF)和5-甲酰基-2-呋喃甲酸(FFA),其可以通过脱水和环化转化成FDCA以产生5-甲酰基-2-呋喃甲酸( FFA),然后氧化生成FDCA。 DEHU或DTHU也可以通过氧化转化成FDCA,生成2,3-二羟基-5-氧代己二酸(DOHA),然后进行脱水和环化以产生FDCA。