| 摘要 |
In a process for isomerizing a feed which contains an aromatic C8 hydrocarbon mixture of ethylbenzene and xylene, in which the para-xylene is less than that at thermal equilibrium, the feed is contacted under isomerization conditions, with a two component catalyst system including component (1) and component (2). Component (1) comprises a zeolite having a constraint index of 1 to 12 and an orthoxylene sorption time of greater than 50 minutes based on its capacity to sorb 30% of the equilibrium capacity of orthoxylene at 120 DEG C and at an orth oxylene partial pressure of 4.5+/-0.8, and 0.05 to 10 wt% of a hydrogenation component. Component (2) comprises a zeolite, having a constraint index of 1 to 12 and a xylene sorption capacity greater than 1 gram/100 grams of zeolite and an ortho-xylene absorption time for 30 percent of said capacity of less than 20 minutes, where the sorption capacity and sorption times are measured at 120 DEG C and a xylene pressure of 4.5+/-0.8mm of mercury, and comprises 0.05 to 10 weight percent of a hydrogenation component, component (2) comprises is at least 50 percent by volume of the catalyst system. |
