The excess adsorption isotherms of para- and meta-xylene, as well as ethylbenzene, on silicalite were measured at 25°C. Mixture Langmuir isotherm was used to fit the excess isotherms. The Langmuir constants and separation factors obtained in this study may be used to simulate the chromatographic separation of para- and meta-xylenes in the future. Compared to KY zeolite, the adsorption capacity of silicalite is smaller, but the para to meta selectivity is higher. A chromatographic xylene separation process based on silicalite would therefore be at least as effective as one based on KY zeolite. The excess isotherms also indicated that the adsorptivity of toluene and cumene were between those p- and m-xylene. Therefore, toluene and cumene could be used as desorbents in the chromatographic separation of para- and meta-xylene. There was a noticeable difference between the affinity of para-xylene and ethylbenzene on silicalite. However, neither cumene nor toluene is the suitable desorbent for the separation of ethylbenzene and p-xylene.
|頁（從 - 到）
|Journal of the Chinese Institute of Chemical Engineers
|已出版 - 3月 1989