Process for xylene isomerization using ZSM-23 zeolite
    34.
    发明授权
    Process for xylene isomerization using ZSM-23 zeolite 失效
    使用ZSM-23沸石的二甲苯异构化方法

    公开(公告)号:US4599475A

    公开(公告)日:1986-07-08

    申请号:US747736

    申请日:1985-06-19

    摘要: An improved process is disclosed for the isomerization of xylenes over a zeolite which may contain a platinum group metal. The improvement resides in the use of ZSM-23 zeolite which exhibits enhanced selectivity which inhibits the production of undesired C.sub.9.sup.+ aromatic transalkylation by-products. ZSM-23 having pores substantially unobstructed by silica, such as that made from a forming mixture containing amorphous precipitated silica as a silica source, has been found to be particularly useful in the process of the present invention.

    摘要翻译: 公开了一种用于二甲苯异构化的改进方法,其可以含有铂族金属的沸石。 改进在于使用ZSM-23沸石,其表现出增强的选择性,其抑制不需要的C9 +芳族烷基转移副产物的产生。 已经发现具有基本上不被二氧化硅阻挡的孔的ZSM-23,例如由含有无定形沉淀二氧化硅作为二氧化硅源的形成混合物制成的孔,其在本发明的方法中特别有用。