Abstract
The author discusses medium-pore ZSM-5 zeolites found to be excellent for the separation of p-xylene and ethylbenzene from C/sub 8/ aromatics. Their adsorption capacity and selectivity for p-xylene were high. The selectivity for p-xylene over ethylbenzene was 5.5 at the optimum SiO/sub 2//Al/sub 2/O/sub 3/ of 700. The competitive adsorption capacity for p-xylene from a simulated reformer product was 120 mg/g. The p-xylene selectivity increased sharply and then leveled off when p-xylene loadings reached 50 and 90 mg/g, respectively. The high p-xylene selectivity and its dependence on p-xylene loading are believed to be related to the unique packing of p-xylene in the crystalline cavities.
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