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高硅中孔沸石,如ZSM-5,是一种从C_8芳烃中分离对二甲苯和乙苯的优良吸附剂.除吸附选择性和活性高外,高硅ZSM-5的分离性能还不受水分存在的影响,由于它是憎水性的.当它的SiO_2/Al_2O_3比大于～500(或Al_2O_3含量<0.34%)时,ZSM-5是憎水的,它的烃吸附活性和选择性不受水影响.低硅(高铝)沸石与常规八面沸石基吸附剂相同,在有水存在时丧失对烃类的吸附活性和对二甲苯的选择性.
High-silica mesoporous zeolites, such as ZSM-5, are excellent adsorbents for the separation of paraxylene and ethylbenzene from C_8 aromatics. In addition to their high selectivity and high activity, the separation performance of high-silicon ZSM-5 is not compromised The presence of moisture, due to its hydrophobic nature, ZSM-5 is hydrophobic when its SiO 2 / Al 2 O 3 ratio is above 500 (or Al 2 O 3 content <0.34%) and its hydrocarbon adsorption activity and selectivity are not affected Water Effects Low silica (high alumina) zeolites, like conventional faujasite-based adsorbents, lose their adsorption of hydrocarbons and para-xylene in the presence of water.