Vapor-Phase Adsorption and Separation of Ethylbenzene and Styrene on the Metal鈥揙rganic Frameworks MIL-47 and MIL-53(Al)

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• 作者：Tom Remy ; Lina Ma ; Michael Maes ; Dirk E. De Vos ; Gino V. Baron ; Joeri F. M. Denayer
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2012
• 出版时间：November 14, 2012
• 年：2012
• 卷：51
• 期：45
• 页码：14824-14833
• 全文大小：484K
• 年卷期：v.51,no.45(November 14, 2012)
• ISSN：1520-5045

文摘

Separation of styrene (ST) from ethylbenzene (EB) remains an industrially relevant challenge in the production of polystyrene. Adsorptive separation with metal鈥搊rganic frameworks (MOFs) is a potential alternative for the conventional vacuum distillation process. Adsorption and separation of ST and EB on the MOFs MIL-47 and MIL-53(Al) were studied under vapor-phase conditions. ST and EB show traditional type I isotherms on MIL-47. Contrarily, ST adsorption isotherms show steep steps on MIL-53(Al) as a result of the breathing of the flexible MOF upon increased adsorbate pressure. The separation potential of both MOFs was investigated by performing vapor-phase breakthrough experiments at total hydrocarbon partial pressures between 1.14 and 16.4 mbar and temperatures between 35 and 90 掳C. ST is preferentially adsorbed on both MOFs. Although the MOFs are isostructural, the evolution of selectivity with temperature and pressure is different for both materials due to the different interaction and separation mechanisms.