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Styrene Purification by Guest-Induced Restructuring of Pillar[6]arene.

ABSTRACT: The separation of styrene (St) and ethylbenzene (EB) mixtures is important in the chemical industry. Here, we explore the St and EB adsorption selectivity of two pillar-shaped macrocyclic pillar[n]arenes (EtP5 and EtP6; n = 5 and 6). Both crystalline and amorphous EtP6 can capture St from a St-EB mixture with remarkably high selectivity. We show that EtP6 can be used to separate St from a 50:50 v/v St:EB mixture, yielding in a single adsorption cycle St with a purity of >99%. Single-crystal structures, powder X-ray diffraction patterns, and molecular simulations all suggest that this selectivity is due to a guest-induced structural change in EtP6 rather than a simple cavity/pore size effect. This restructuring means that the material "self-heals" upon each recrystallization, and St separation can be carried out over multiple cycles with no loss of performance.

SUBMITTER: Jie K

PROVIDER: S-EPMC5360353 | biostudies-literature | 2017 Mar

REPOSITORIES: biostudies-literature

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Styrene Purification by Guest-Induced Restructuring of Pillar[6]arene.

Jie Kecheng K Liu Ming M Zhou Yujuan Y Little Marc A MA Bonakala Satyanarayana S Chong Samantha Y SY Stephenson Andrew A Chen Linjiang L Huang Feihe F Cooper Andrew I AI

Journal of the American Chemical Society 20170220 8

The separation of styrene (St) and ethylbenzene (EB) mixtures is important in the chemical industry. Here, we explore the St and EB adsorption selectivity of two pillar-shaped macrocyclic pillar[n]arenes (EtP5 and EtP6; n = 5 and 6). Both crystalline and amorphous EtP6 can capture St from a St-EB mixture with remarkably high selectivity. We show that EtP6 can be used to separate St from a 50:50 v/v St:EB mixture, yielding in a single adsorption cycle St with a purity of >99%. Single-crystal stru ...[more]

PMID: 28182420

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