Effective separation of xylene isomers is possible with pervaporation through MFI-silicalite membranes. The effect of microstructural differences in silicalite membranes on the separation of xylene isomers was investigated. MFI-type zeolite membranes with random and ordered orientations were synthesized using a seeded growth method with and without organic templates. It was found that template-free random oriented membranes were capable of pure component p/o xylene separation factors of about 20 and p-xylene flux of 0.3 kg m-2 hr-1. The membranes with preferred orientation showed comparable flux of xylene isomers but decreased selectivities ranging from 2 to 3. These results indicate that microstructure strongly affects the ability of the membrane to perform xylene separation.
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机译:通过MFI-硅藻土膜进行全蒸发可有效分离二甲苯异构体。研究了硅质岩膜微结构差异对二甲苯异构体分离的影响。使用带有和不带有有机模板的种子生长方法合成了具有随机和有序取向的MFI型沸石膜。发现无模板的无规取向膜能够具有约20的纯组分对二甲苯分离因子和0.3 kg m-2 hr-1的对二甲苯通量。具有优选取向的膜显示出可比的二甲苯异构体通量,但选择性降低了2至3。这些结果表明,微结构强烈影响膜进行二甲苯分离的能力。
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