Abstract: Adsorption rate curves and isotherms of p-xylene、m-xylene on KX and CaX zeolites were obtained by conducting static adsorption experiments. The breakthrough curves of p-xylene/m-xylene mixture adsorption on zeolites were obtained by conductin dynamic adsorption experiment. The results showed that static and dynamic adsorption capacities of the xylene isomers on CaX were higher compared to the adsorption capacities on KX. And the separation factor of the xylene isomers on CaX were lower than that on KX. The results indicated that the isotherms of xylene isomers on CaX were consistent with Langmuir isotherm equation and the adsorption kinetic data of zeolites adsorption fitted well with the pseudo-second-order rate equation.

Key words: p-xylene, m-xylene, KX, CaX, adsorption equilibrium, dynamic adsorption

摘要： 通过静态吸附实验，测定了对二甲苯、间二甲苯在分子筛KX和CaX上的吸附速率曲线及吸附等温线；动态吸附穿透实验测定了对二甲苯/间二甲苯混合液在固定床中的连续流出曲线。结果表明，对二甲苯、间二甲苯在CaX上的静态饱和吸附量和动态穿透吸附量均高于KX，但CaX对对二甲苯的吸附选择性不及KX；Langmuir吸附等温线方程可以很好地拟合对二甲苯、间二甲苯在CaX上的等温线；二级吸附速率方程可以较好地描述对二甲苯、间二甲苯的吸附动力学行为。

关键词: 对二甲苯, 间二甲苯, KX, CaX, 吸附平衡, 动态吸附