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    • 1. 发明授权
    • Process for purifying polyethers
    • 聚醚的纯化方法
    • US06376625B1
    • 2002-04-23
    • US09383171
    • 1999-08-25
    • James P. CosmanPaul D. BettgeRichard J. ElwellRaymond A. Plepys
    • James P. CosmanPaul D. BettgeRichard J. ElwellRaymond A. Plepys
    • C08F208
    • C08G65/2648C08G65/30Y02P20/584
    • This invention involves several ways for improving a coalescing process for purifying a crude polyether. In one aspect, particulate zirconium dioxide is selected as a coalescing medium. In a second aspect, alkali metal catalyst is recovered and recycled to make additional polyether product. In a third aspect, a polyether stream obtained from the coalescing step is purified by stripping water in at least two phases, the first of which involves moderate conditions so that water but not allyl alcohol or higher molecular weight impurities are removed from the polyether, and the second of which involves more stringent stripping conditions. In a fourth aspect, crude polyether that is subjected to a holding period before undergoing a coalescing step is mixed with water to minimize the formation of impurities that are believed to compatibilize the aqueous and polyether phases. In a fifth aspect, the coalescing process is conducted under a non-oxidizing atmosphere.
    • 本发明涉及改进用于纯化粗聚醚的聚结过程的几种方法。 在一个方面,选择颗粒二氧化锆作为聚结介质。 在第二方面,碱金属催化剂被回收并再循环以制备额外的聚醚产物。 在第三方面,从聚结步骤获得的聚醚流通过至少两相汽提水进行纯化,其中第一步涉及中等条件,从而从聚醚中除去水而不是烯丙醇或更高分子量的杂质, 其中第二个涉及更严格的剥离条件。 在第四方面,将经过聚结步骤之前的保持期的粗聚醚与水混合以最小化被认为使水相和聚醚相相容的杂质的形成。 在第五方面,聚结过程在非氧化气氛下进行。