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Highly Selective, High‐Capacity Separation of o ‐Xylene from C 8 Aromatics by a Switching Adsorbent Layered Material
Author(s) -
Wang ShiQiang,
Mukherjee Soumya,
PatykKaźmierczak Ewa,
Darwish Shaza,
Bajpai Alankriti,
Yang QingYuan,
Zaworotko Michael J.
Publication year - 2019
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201901198
Subject(s) - ethylbenzene , selectivity , chemistry , adsorption , toluene , saturation (graph theory) , o xylene , xylene , chemical engineering , chromatography , organic chemistry , catalysis , mathematics , combinatorics , engineering
Abstract Purification of the C 8 aromatics (xylenes and ethylbenzene) is particularly challenging because of their similar physical properties. It is also relevant because of their industrial utility. Physisorptive separation of C 8 aromatics has long been suggested as an energy efficient solution but no physisorbent has yet combined high selectivity (>5) with high adsorption capacity (>50 wt %). Now a counterintuitive approach to the adsorptive separation of o ‐xylene from other C 8 aromatics involves the study of a known nonporous layered material, [Co(bipy) 2 (NCS) 2 ] n ( sql‐1‐Co‐NCS ), which can reversibly switch to C 8 aromatics loaded phases with different switching pressures and kinetics, manifesting benchmark o ‐xylene selectivity (S OX/EB ≈60) and high saturation capacity (>80 wt %). Structural insight into the observed selectivity and capacity is gained by analysis of the crystal structures of C 8 aromatics loaded phases.