Method for preparing high molecular weight random polyhydroxypolyamides
    5.
    发明授权
    Method for preparing high molecular weight random polyhydroxypolyamides 有权
    制备高分子量无规多羟基聚酰胺的方法

    公开(公告)号:US06894135B2

    公开(公告)日:2005-05-17

    申请号:US10734418

    申请日:2003-12-10

    摘要: High molecular weight random polyhydroxypolyamides (PHPAs) are produced by creating prepolymers which are further polymerized. Random prepolymers are formed from a stoichiometrically molar balance (1:1) starting material. The starting material is a 1:1 stoichiometrically balanced esterified aldaric acid:alkylene or alkylene derived diammonium salt. Alternatively, the starting material is an esterified stoichiometrically balanced diacid:diamine salt and a N′-ammoniumalkyl (or alkyl derived)-D-aldaramic acid terminal carboxylate zwitterionic salt mixture. The starting materials are polymerized in a basic alcohol using a second amine. The polymerized material, or the random prepolymers, are isolated and then further polymerized in a solvent, typically a mixed solvent of an alcohol and non-alcohol, to obtain the high molecular weight PHPAs.

    摘要翻译: 通过产生进一步聚合的预聚物制备高分子量无规多羟基聚酰胺(PHPAs)。 随机预聚物由化学计量摩尔平衡(1:1)原料形成。 原料是1:1化学计量平衡的酯化醛酸:亚烷基或亚烷基衍生的二铵盐。 或者,原料是酯化的化学计量平衡的二酸:二胺盐和N'-烷基(或烷基衍生的)-D-阿拉斯加酸末端羧酸酯两性离子盐混合物。 使用第二种胺将原料在碱性醇中聚合。 分离聚合的材料或无规预聚物,然后在溶剂(通常为醇和非醇的混合溶剂)中进一步聚合,得到高分子量的PTA。

    SYSTEM AND METHOD FOR PURIFYING MOTHER LIQUID STEAM OF POLYTETRAFLUOROETHYLENE DISPERSION LIQUID
    9.
    发明申请
    SYSTEM AND METHOD FOR PURIFYING MOTHER LIQUID STEAM OF POLYTETRAFLUOROETHYLENE DISPERSION LIQUID 有权
    用于净化聚四氟乙烯分散液的母液液体的系统和方法

    公开(公告)号:US20150165363A1

    公开(公告)日:2015-06-18

    申请号:US14378632

    申请日:2012-08-02

    IPC分类号: B01D50/00 B01D19/02 B01D53/14

    摘要: A system for purifying mother liquid steam of polytetrafluoroethylene dispersion liquid comprises a concentration kettle (1), a defoaming pot (2), a gas-liquid separator (3) and a falling film absorption tower (4). A steam exit of the concentration kettle (1) is connected to an entrance of the defoaming pot (2). An exit of the defoaming pot (2) is connected to a feeding port of the gas-liquid separator (3). A gas exit of the gas-liquid separator (3) is connected to the falling film absorption tower (4). A liquid exit of the gas-liquid separator (3) is connected to the concentration kettle (1). A method for purifying mother liquid steam of polytetrafluoroethylene dispersion liquid by using the system is further provided.

    摘要翻译: 用于净化聚四氟乙烯分散液的母液蒸汽的系统包括浓缩釜(1),消泡罐(2),气液分离器(3)和降膜吸收塔(4)。 浓缩釜(1)的蒸汽出口连接到消泡罐(2)的入口。 消泡罐(2)的出口与气液分离器(3)的进料口连接。 气液分离器(3)的气体出口连接到降膜吸收塔(4)。 气液分离器(3)的液体出口与浓缩釜(1)连接。 还提供了一种通过使用该系统来净化聚四氟乙烯分散液的母液蒸汽的方法。