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Issue 38, 2019
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Benchmark selectivity p-xylene separation by a non-porous molecular solid through liquid or vapor extraction

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Abstract

Solid–liquid separation of similarly sized organic molecules utilizing sorbents offers the potential for new energy-efficient approaches to a number of important industrial separations such as xylenes (C8) separations. Research on selective C8 sorption has tended to focus upon rigid porous materials such as zeolites and MOFs but has revealed generally weak selectivity that is inconsistent across the range of C8 molecules. Nevertheless, there are a few recent examples of non-porous molecular materials that exhibit relatively high selectivity for p-xylene (pX) from pX/oX, approaching that of the current benchmark pX sorbent, the zeolite H/ZSM-5. Herein, we report that a L-shaped Ag(I) complex, AgLClO4 (M), which crystallizes as a non-porous molecular solid material, offering exceptional performance for pX selectivity across the range of C8 isomers with liquid extraction selectivity values of 24.0, 10.4 and 6.2 vs. oX, eB and mX, respectively. The pX selectivities over oX and eB are among the highest yet reported. Moreover, M also exhibits strong vapor extraction selectivity and can be regenerated by exposure to vacuum drying.

Graphical abstract: Benchmark selectivity p-xylene separation by a non-porous molecular solid through liquid or vapor extraction

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Supplementary files

Article information


Submitted
29 May 2019
Accepted
29 Jul 2019
First published
06 Aug 2019

This article is Open Access
All publication charges for this article have been paid for by the Royal Society of Chemistry

Chem. Sci., 2019,10, 8850-8854
Article type
Edge Article

Benchmark selectivity p-xylene separation by a non-porous molecular solid through liquid or vapor extraction

N. Sun, S. Wang, R. Zou, W. Cui, A. Zhang, T. Zhang, Q. Li, Z. Zhuang, Y. Zhang, J. Xu, M. J. Zaworotko and X. Bu, Chem. Sci., 2019, 10, 8850
DOI: 10.1039/C9SC02621E

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