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    • 4. 发明授权
    • Method for the single-step production of polytetrahydrofuran and tetrahydrofuran copolymers
    • 单步生产聚四氢呋喃和四氢呋喃共聚物的方法
    • US06716937B2
    • 2004-04-06
    • US10312851
    • 2003-01-02
    • Gerd BohnerThomas DomschkeRolf-Hartmuth FischerMartin HaubnerChristoph SigwartUlrich SteinbrennerChristian Tragut
    • Gerd BohnerThomas DomschkeRolf-Hartmuth FischerMartin HaubnerChristoph SigwartUlrich SteinbrennerChristian Tragut
    • C08F244
    • C08G65/30C08G65/20
    • A process for the single-stage preparation of polytetrahydrofuran and/or tetrahydrofuran copolymers having a mean molecular weight of from 650 to 5000 dalton by polymerization of tetrahydrofuran over a heterogeneous acid catalyst in the presence of at least one telogen and/or comonomer selected from the group consisting of alpha,omega-diols, water, polytetrahydrofuran having a molecular weight of from 200 to 700 dalton and cyclic ethers comprises a) separating off the catalyst and/or downstream products of the catalyst suspended and/or dissolved in the output from the polymerization, b) fractionating the resulting catalyst-free output from the polymerization in at least one distillation step to give a distillation residue comprising the polymerization product and at least one tetrahydrofuran fraction and returning at least part of the tetrahydrofuran fraction to the polymerization and c) separating low molecular weight polytetrahydrofuran and/or tetrahydrofuran copolymers having a mean molecular weight of from 200 to 700 dalton from the distillation residue from work-up step b) and isolating polytetrahydrofuran and/or tetrahydrofuran copolymers having a mean molecular weight of from 650 to 5000 dalton.
    • 一种通过在多相酸催化剂的存在下,在四氢呋喃和/或共聚单体的存在下,通过四氢呋喃聚合,单分级制备平均分子量为650-5000道尔顿的聚四氢呋喃和/或四氢呋喃共聚物的方法,该共聚单体选自 由α,ω-二醇,水,分子量为200至700道尔顿的聚四氢呋喃和环醚组成的组包括:a)将催化剂和/或催化剂的下游产物分离出悬浮和/或溶解在聚合物的输出中 b)在至少一个蒸馏步骤中将所得无催化剂的产物从聚合中分馏,得到包含聚合产物和至少一种四氢呋喃馏分的蒸馏残余物,并将至少部分四氢呋喃馏分返回到聚合反应中, 分子量的四氢呋喃和/或四氢呋喃共聚物 来自后处理步骤b)的蒸馏残余物的200至700道尔顿的颗粒重量,并分离平均分子量为650-5000道尔顿的聚四氢呋喃和/或四氢呋喃共聚物。