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    • 15. 发明授权
    • Method of producing an alcoholic solutions of polyetrahydrofurane that comprises terminal OH groups
    • 制备包含末端OH基的聚四氢呋喃醇溶液的方法
    • US06878802B2
    • 2005-04-12
    • US10486823
    • 2002-08-20
    • Jürgen CiprianWulfrich Friedemann BeerVolkmar Menger
    • Jürgen CiprianWulfrich Friedemann BeerVolkmar Menger
    • C08G65/20C08G65/30C08G65/331C08G64/02
    • C08G65/30C08G65/20C08G65/331
    • In a process for preparing polytetrahydrofuran having terminal OH groups (PTHF) from the corresponding polytetramethylene ether having acyloxy end groups by transesterification with alcohols in the presence of a sodium-containing catalyst followed by passing the alcoholic PTHF solution in the presence of a catalytic amount of water directly through at least one ion exchanger to remove the sodium ions, the removal of the sodium ions is carried out in a fully continuous ion exchange unit which comprises: a plurality of ion exchange cells (Z) which are arranged on a rotary platform and are each provided with a distribution element and a collection element and a central valve (V) having a stator disk (S) and a rotor disk (R) via which the introduction and discharge of all liquid streams into or out of the ion exchange unit occurs, and feed and discharge lines from each ion exchange cell (Z) to the central valve (V).
    • 在具有酰氧基端基的相应聚四亚甲基醚中通过在含有钠的催化剂的存在下与醇进行酯交换,然后在含有催化量的催化剂存在下使该醇PTHF溶液通过的方法制备具有末端OH基(PTHF)的聚四氢呋喃的方法 水直接通过至少一个离子交换器去除钠离子,在完全连续的离子交换单元中进行钠离子的去除,其包括:多个离子交换单元(Z),其设置在旋转平台上, 分别设置有分配元件和收集元件以及具有定子盘(S)和转子盘(R)的中心阀(V),经由所述定子盘(S)和所有转子盘(R)将所有液体流引入和排出离子交换单元 ,以及从每个离子交换单元(Z)到中心阀(V)的进料和排出管线。