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    • 43. 发明授权
    • Xylene isomerization process to exhaustively convert ethylbenzene and
non-aromatics
    • 二甲苯异构化方法彻底转化乙苯和非芳族化合物
    • US4899011A
    • 1990-02-06
    • US819072
    • 1986-01-15
    • Yung F. ChuCharles T. KresgeRene B. LaPierre
    • Yung F. ChuCharles T. KresgeRene B. LaPierre
    • B01J29/00B01J29/40B01J29/70C07B61/00C07C1/00C07C5/27C07C15/08C07C67/00
    • C07C5/2724Y02P20/52
    • A new xylene isomerization process which is capable of converting ethylbenzene and non-aromatic exhaustively while selectively converting xylenes to thermal equilibrium in mixed EB/xylene feeds is proposed. The new process employs a two component catalyst system; each of the components contains a strong hydrogenation metal and a zeolite. The zeolite of each of the two components differs from the other in its selectivity for xylene isomerization and its capacity to deethylete ethylbenzene. That selectivity for xylene isomerization is described by xylene diffusion properties of the zeolite. In one embodiment of the invention, ZSM-5 of greater than 1 micron crystal size and an alpha value of greater than 100 in a first component and ZSM-5 of less than 1 micron crystal size and an alpha of less than 100 in a second catalyst component satisfy the diffusion properties which allow for the exhaustive conversion of ethyl benzene and non-aromatics and the selectivity for xylene isomerization of typical xylene isomerization feeds. In a preferred embodiment, the feed is cascaded over the first component and then the aforementioned second component.
    • 提出了一种新的二甲苯异构化方法,其能够在选择性地将二甲苯转化为混合的EB /二甲苯进料中的热平衡的同时彻底转化乙苯和非芳族。 新工艺采用双组分催化剂体系; 每种组分含有强氢化金属和沸石。 两种组分中的每一种的沸石在二甲苯异构化的选择性及其对乙酸乙酯的能力方面彼此不同。 对二甲苯异构化的选择性由沸石的二甲苯扩散性质描述。 在本发明的一个实施方案中,大于1微米晶体尺寸的ZSM-5和第一组分中的大于100的α值和小于1微米晶体尺寸的ZSM-5和在一秒钟内小于100的α 催化剂组分满足允许乙苯和非芳族化合物的彻底转化以及典型的二甲苯异构化进料的二甲苯异构化的选择性的扩散性质。 在优选实施方式中,进料在第一组分上然后上述第二组分级联。