Process for the removal of lower molecular weight fractions of
poly(arylene sulfide) polymers
    1.
    发明授权
    Process for the removal of lower molecular weight fractions of poly(arylene sulfide) polymers 失效
    去除聚(亚芳基硫醚)聚合物的较低分子量馏分的方法

    公开(公告)号:US5334701A

    公开(公告)日:1994-08-02

    申请号:US965489

    申请日:1992-10-23

    IPC分类号: C08G75/02 C08G75/06 C08G75/14

    CPC分类号: C08G75/0281

    摘要: A method is provided for selectively extracting the lower molecular weight fraction of a poly(arylene sulfide) polymer by contacting the polymer with a polar organic compound and a promoter compound to form a less dense polymer-lean liquid phase and a more dense polymer-rich liquid phase, separating the polymer-lean liquid phase from the polymer-rich liquid phase, and recovering the polymer from the polymer-rich phase. Alternatively, either of the phases can be isolated and polar organic compound and optionally promoter can be added to form two new phases, followed by isolation of the new polymer-rich phase. This process can be repeated as often as desired or practicable in order to recover polymer having a desired molecular weight and/or molecular weight distribution.

    摘要翻译: 提供了一种通过使聚合物与极性有机化合物和助催化剂化合物接触以选择性地提取聚(亚芳基硫醚)聚合物的较低分子量部分以形成较不致密的贫聚合物稀相的液相和更致密的聚合物丰富的方法 液相,从富含聚合物的液相中分离富聚合物的液相,并从富聚合物相中回收聚合物。 或者,可以分离任一相,并且可以加入极性有机化合物和任选的助催化剂以形成两个新相,随后分离新的富聚合物相。 为了回收具有所需分子量和/或分子量分布的聚合物,可以按需要或可行地重复该过程。

    Process and apparatus for reducing take-off valve plugging in a polymerization process
    3.
    发明授权
    Process and apparatus for reducing take-off valve plugging in a polymerization process 有权
    在聚合过程中减少开关阀堵塞的方法和装置

    公开(公告)号:US07015289B2

    公开(公告)日:2006-03-21

    申请号:US10660824

    申请日:2003-09-12

    IPC分类号: C08F2/12

    摘要: A slurry polymerization process removes a portion of the fluid slurry without using a settling leg or a continuous take-off. The process uses a reactor take-off valve that is periodically fully closed and fully opened such that the withdrawn slurry is removed from the reactor in a discontinuous manner. The regular, periodic full closing and full opening of the take-off valve reduces instances of polymer plugging the take-off valve. In another aspect of the invention, a take-off valve is throttled in a repetitive pattern to reduce plugging of the take-off valve.

    摘要翻译: 淤浆聚合方法在不使用沉降腿或连续起飞的情况下除去一部分流体浆液。 该方法使用周期性地完全关闭并完全打开的反应器排出阀,使得排出的浆料以不连续的方式从反应器中移出。 起飞阀的常规,周期性全关闭和全开,减少了聚合物堵塞起飞阀的情况。 在本发明的另一方面,一个抽出阀以重复的模式节流,以减少排出阀的堵塞。