Simultaneous Trapping of C2H2 and C2H6 from a Ternary Mixture of C2H2/C2H4/C2H6 in a Robust Metal–Organic Framework for the Purification of C2H4

The removal of C2H2 and C2H6 from C2H4 streams is of great significance for feedstock purification to produce polyethylene and other commodity chemicals but the simultaneous adsorption of C2H6 and C2H2 over C2H4 from a ternary mixture has never been realized. Herein, a robust metal–organic framework...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2018-12, Vol.57 (49), p.16067-16071
Main Authors: Hao, Hong‐Guo, Zhao, Yun‐Feng, Chen, Di‐Ming, Yu, Jia‐Mei, Tan, Kui, Ma, Shengqian, Chabal, Yves, Zhang, Zhi‐Ming, Dou, Jian‐Min, Xiao, Zi‐Hui, Day, Gregory, Zhou, Hong‐Cai, Lu, Tong‐Bu
Format: Article
Language:English
Subjects:
Adsorption
Computer applications
electrostatic interactions
Electrostatic properties
gas separation
light hydrocarbons
Metal-organic frameworks
Metals
Organic chemistry
Oxygen atoms
Polyethylene
Polyethylenes
Polymerization
Purification
Selective adsorption
Streams
Water chemistry
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Summary:The removal of C2H2 and C2H6 from C2H4 streams is of great significance for feedstock purification to produce polyethylene and other commodity chemicals but the simultaneous adsorption of C2H6 and C2H2 over C2H4 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 C2H2 and C2H6 over C2H4. Breakthrough experiments show that TJT‐100 can be used as an adsorbent for high‐performance purification of C2H4 from a ternary mixture of C2H2/C2H4/C2H6 (0.5:99:0.5) to afford a C2H4 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 C2H2 and C2H6 through the formation of multiple C−H⋅⋅⋅O electrostatic interactions, while the corresponding C2H4–framework interaction is unfavorable. A robust porous metal–organic framework was synthesized and utilized for the highly selective separation of C2H4 from a ternary mixture of C2 hydrocarbons. After a single operation, the C2H4 purity of the outlet was greater than 99.997 %.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201809884