Interaction-selective molecular sieving adsorbent for direct separation of ethylene from senary C2-C4 olefin/paraffin mixture

Yong Peng, Hanting Xiong, Peixin Zhang, Zhiwei Zhao, Xing Liu, Shihui Tang, Yuan Liu, Zhenliang Zhu, Weizhen Zhou, Zhenning Deng, Junhui Liu, Yao Zhong, Zeliang Wu, Jingwen Chen, Zhenyu Zhou, Shixia Chen, Shuguang Deng and Jun Wang ()
Additional contact information
Yong Peng: Nanchang University
Hanting Xiong: Nanchang University
Peixin Zhang: Nanchang University
Zhiwei Zhao: Nanchang University
Xing Liu: Nanchang University
Shihui Tang: Nanchang University
Yuan Liu: Nanchang University
Zhenliang Zhu: Nanchang University
Weizhen Zhou: Nanchang University
Zhenning Deng: Nanchang University
Junhui Liu: Nanchang University
Yao Zhong: Nanchang University
Zeliang Wu: Nanchang University
Jingwen Chen: Nanchang University
Zhenyu Zhou: Nanchang University
Shixia Chen: Nanchang University
Shuguang Deng: Arizona State University
Jun Wang: Nanchang University

Nature Communications, 2024, vol. 15, issue 1, 1-12

Abstract: Abstract Olefin/paraffin separations are among the most energy-intensive processes in the petrochemical industry, with ethylene being the most widely consumed chemical feedstock. Adsorptive separation utilizing molecular sieving adsorbents can optimize energy efficiency, whereas the size-exclusive mechanism alone cannot achieve multiple olefin/paraffin sieving in a single adsorbent. Herein, an unprecedented sieving adsorbent, BFFOUR-Cu-dpds (BFFOUR = BF4-, dpds = 4,4’-bipyridinedisulfide), is reported for simultaneous sieving of C2-C4 olefins from their corresponding paraffins. The interlayer spaces can be selectively opened through stronger guest-host interactions induced by unsaturated C = C bonds in olefins, as opposed to saturated paraffins. In equimolar six-component breakthrough experiments (C2H4/C2H6/C3H6/C3H8/n-C4H8/n-C4H10), BFFOUR-Cu-dpds can simultaneously divide olefins from paraffins in the first column, while high-purity ethylene ( > 99.99%) can be directly obtained through the subsequent column using granular porous carbons. Moreover, gas-loaded single-crystal analysis, in-situ infrared spectroscopy measurements, and computational simulations demonstrate the accommodation patterns, interaction bonds, and energy pathways for olefin/paraffin separations.

Date: 2024
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DOI: 10.1038/s41467-024-45004-9

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