会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 47. 发明授权
    • Process for improving purity of para-xylene product
    • 提高对二甲苯产品纯度的方法
    • US06489527B1
    • 2002-12-03
    • US08575443
    • 1995-12-20
    • John Di-Yi OuHarold William HelmkeDana Lynn Pilliod
    • John Di-Yi OuHarold William HelmkeDana Lynn Pilliod
    • C07C266
    • C07C7/14875C07C7/005C07C7/14883Y02P20/52C07C15/08
    • A process for producing 99.5+ wt. % para-xylene by selective alkylation has been discovered. A mixure of isomers of para-xylene having at least about 90.0 wt. % purity may be reacted with an alkylating agent having at least one tertiary butyl moiety in the presence of an acidic catalyst under conditions where the catalyst is in good molecular contact with the non-para-xylene isomers. The catalyst may be a high surface area acidic heterogeneous catalyst such as a proton-exchanged zeolite. Upon distillation, para-xylene is recovered in 99.5 wt. % purity or higher. The selective alkylation gives little or no alkylation of the para-xylene, the most predominant species, and very little or no isomerization to the other, non-desirable isomers.
    • 一种生产99.5重量% 已经发现通过选择性烷基化的%对二甲苯。 对二甲苯异构体的混合物具有至少约90.0wt。 在催化剂与非对二甲苯异构体分子接触良好的条件下,可以在酸性催化剂存在下,将纯度的%与具有至少一个叔丁基部分的烷基化剂反应。 催化剂可以是高表面积的酸性非均相催化剂,例如质子交换的沸石。 蒸馏后,在99.5wt。 %纯度或更高。 选择性烷基化几乎不产生对二甲苯(最主要的物质)的烷基化,并且很少或没有异构化到另一种非期望的异构体。