首页|Separation of ethane/ethylene gas mixture by ethane-selective CAU-3-NDCA adsorbent

Separation of ethane/ethylene gas mixture by ethane-selective CAU-3-NDCA adsorbent

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  • NSTL
  • Elsevier
Ethane-selective adsorbents for separating ethane (C2H6)/ethylene (C2H4) gas mixtures have attracted considerable interest as promising alternatives to conventional cryogenic distillation because of the possibility of directly producing high-purity C2H4 (>99.95%). Herein, CAU-3-NDCA built by the coordination bond between [Al-12(OCH3)(24)](12+) and 2,6-naphthalenedicarboxylic acid (NDCA) was evaluated for use as a C2H6-selective adsorbent for separating a C2H6/C2H4 gas mixture. The separation performance of the adsorbents was investigated using single-component gas isotherms, ideal adsorbed solution theory calculations, dynamic breakthrough experiments for gas mixture, and molecular simulations, such as Monte Carlo simulation and density functional theory calculation. CAU-3-NDCA displayed exceptional adsorption capacity (9.2-10.2 mmol g(-1) at 15 bar) and good C2H6/C2H4 selectivity (1.44-1.56) in the temperature range 293-313 K. In the breakthrough experiments, the C2H6/C2H4 separation performance of CAU-3-NDCA exhibited high-purity C2H4 productivity of 6.6 and 25.7 L-STP kg(-1) under a 50/50 (v/v) and 10/90 (v/v) C2H6/C2H4 gas mixture, respectively, at 298 K and 7 bar. Recyclability was evaluated by a multi-cyclic breakthrough test for five cycles with a 10/90 (v/v) C2H6/C2H4 gas mixture. Molecular simulations indicated that the preferential adsorption of C2H6 originates from the higher affinity strength of multiple C-H center dot center dot center dot pi interactions of C2H6 with NDCA linkers, in addition to the stronger methyl group-gas interaction of the methanolate group than those of C2H4. Moreover, it is characterised by thermal and moisture stability. Therefore, CAU-3-NDCA is a promising candidate for pressure swing adsorption operation as a C2H6-selective adsorbent.

Al-based MOFCAU-3-NDCAEthane/ethylene separationEthane-selective adsorbentHigh-purity ethyleneBreakthrough experimentMETAL-ORGANIC FRAMEWORKOLEFIN-PARAFFIN SEPARATIONPREFERENTIAL ADSORPTIONPI-COMPLEXATIONHIGH-CAPACITYETHYLENEHYDROCARBONSPROPYLENECRACKINGPROPANE

Cho, Kyung Ho、Yoon, Ji Woong、Lee, Jeong Hyeon、Kim, Jin Chul、Kim, Kiwoong、Chang, Jong-San、Kwak, Sang Kyu、Lee, U-Hwang

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Korea Res Inst Chem Technol KRICT

Ulsan Natl Inst Sci & Technol UNIST

2022

10.1016/j.micromeso.2021.111572

Microporous and mesoporous materials

Microporous and mesoporous materials

EISCI
ISSN：1387-1811
年,卷(期)：2022.330
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