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Simultaneous Trapping of C<sub>2</sub>H<sub>2</sub> and C<sub>2</sub>H<sub>6</sub> from a Ternary Mixture of C<sub>2</sub>H<sub>2</sub>/C<sub>2</sub>H<sub>4</sub>/C<sub>2</sub>H<sub>6</sub> in a Robust Metal–Organic Framework for the Purification of C<sub>2</sub>H<sub>4</sub>

DOI

326

Citations

29

References

2018

Year

Hongguo Hao, Yunfeng Zhao, Di‐Ming Chen, Jiamei Yu, Kui Tan, Shengqian Ma, Yves J. Chabal, Zhiming Zhang, Jianmin Dou, Zihui Xiao,
Angewandte Chemie International Edition

Abstract

The removal of C<sub>2</sub> H<sub>2</sub> and C<sub>2</sub> H<sub>6</sub> from C<sub>2</sub> H<sub>4</sub> streams is of great significance for feedstock purification to produce polyethylene and other commodity chemicals but the simultaneous adsorption of C<sub>2</sub> H<sub>6</sub> and C<sub>2</sub> H<sub>2</sub> over C<sub>2</sub> H<sub>4</sub> from a ternary mixture has never been realized. Herein, a robust metal-organic framework, TJT-100, was designed and synthesized, which demonstrates remarkably selective adsorption of C<sub>2</sub> H<sub>2</sub> and C<sub>2</sub> H<sub>6</sub> over C<sub>2</sub> H<sub>4</sub> . Breakthrough experiments show that TJT-100 can be used as an adsorbent for high-performance purification of C<sub>2</sub> H<sub>4</sub> from a ternary mixture of C<sub>2</sub> H<sub>2</sub> /C<sub>2</sub> H<sub>4</sub> /C<sub>2</sub> H<sub>6</sub> (0.5:99:0.5) to afford a C<sub>2</sub> H<sub>4</sub> purity greater than 99.997 %, beyond that required for ethylene polymerization. Computational studies reveal that the uncoordinated carboxylate oxygen atoms and coordinated water molecules pointing towards the pore can trap C<sub>2</sub> H<sub>2</sub> and C<sub>2</sub> H<sub>6</sub> through the formation of multiple C-H⋅⋅⋅O electrostatic interactions, while the corresponding C<sub>2</sub> H<sub>4</sub> -framework interaction is unfavorable.

References

YearCitations

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