Methods for inhibiting polymerization of vinyl aromatic compounds during extractive distillation
    1.
    发明授权
    Methods for inhibiting polymerization of vinyl aromatic compounds during extractive distillation 失效
    萃取蒸馏期间抑制乙烯基芳族化合物聚合的方法

    公开(公告)号:US08771476B2

    公开(公告)日:2014-07-08

    申请号:US12705937

    申请日:2010-02-15

    IPC分类号: C07C7/20 C07C7/08

    CPC分类号: C07C7/08 C07C7/20 C07C15/46

    摘要: High temperatures and oxygen exposure during extractive distillation can result in polymerization of vinyl aromatic compounds. In various embodiments, the present disclosure relates to methods for inhibiting polymerization of vinyl aromatic compounds during extractive distillation. In various embodiments, the methods include a) providing a mixture containing at least one vinyl aromatic compound, b) adding at least one dinitrophenol inhibitor to the mixture, and c) after step b), performing an extractive distillation on the mixture to isolate the at least one vinyl aromatic compound. Purified styrene can be isolated by the methods described herein. In some embodiments, the dinitrophenol inhibitor is 2-sec-butyl-4,6-dinitrophenol (DNBP).

    摘要翻译: 萃取蒸馏期间的高温和氧气暴露可导致乙烯基芳族化合物的聚合。 在各种实施方案中,本公开涉及在萃取蒸馏期间抑制乙烯基芳族化合物聚合的方法。 在各种实施方案中,所述方法包括a)提供含有至少一种乙烯基芳族化合物的混合物,b)向混合物中加入至少一种二硝基苯酚抑制剂,和c)在步骤b)之后,对该混合物进行萃取蒸馏以分离 至少一种乙烯基芳族化合物。 纯化的苯乙烯可以通过本文所述的方法分离。 在一些实施方案中,二硝基苯酚抑制剂是2-仲丁基-4,6-二硝基苯酚(DNBP)。