Molecular sieving of iso-butene from C4 olefins with simultaneous high 1,3-butadiene and n-butene uptakes

Junhui Liu, Hanting Xiong, Hua Shuai, Xing Liu, Yong Peng, Lingmin Wang, Pengxiang Wang, Zhiwei Zhao, Zhenning Deng, Zhenyu Zhou, Jingwen Chen, Shixia Chen, Zheling Zeng, Shuguang Deng and Jun Wang ()
Additional contact information
Junhui Liu: Nanchang University
Hanting Xiong: Nanchang University
Hua Shuai: Nanchang University
Xing Liu: Nanchang University
Yong Peng: Nanchang University
Lingmin Wang: Nanchang University
Pengxiang Wang: Nanchang University
Zhiwei Zhao: Nanchang University
Zhenning Deng: Nanchang University
Zhenyu Zhou: Nanchang University
Jingwen Chen: Nanchang University
Shixia Chen: Nanchang University
Zheling Zeng: Nanchang University
Shuguang Deng: Arizona State University
Jun Wang: Nanchang University

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Iso-butene (iso-C4H8) is an important raw material in chemical industry, whereas its efficient separation remains challenging due to similar molecular properties of C4 olefins. The ideal adsorbent should possess simultaneous high uptakes for 1,3-butadiene (C4H6) and n-butene (n-C4H8) counterparts, endowing high efficiency for iso-C4H8 separation in adsorption columns. Herein, a sulfate-pillared adsorbent, SOFOUR-DPDS-Ni (DPDS = 4,4′-dipyridyldisulfide), is reported for the efficient iso-C4H8 separation from binary and ternary C4 olefin mixtures. The rigidity in pore sizes and shapes of SOFOUR-DPDS-Ni exerts the molecular sieving of iso-C4H8, while exhibiting high C4H6 and n-C4H8 uptakes. The benchmark Henry’s selectivity for C4H6/iso-C4H8 (2321.8) and n-C4H8/iso-C4H8 (233.5) outperforms most reported adsorbents. Computational simulations reveal the strong interactions for C4H6 and n-C4H8. Furthermore, dynamic breakthrough experiments demonstrate the direct production of high-purity iso-C4H8 (>99.9%) from C4H6/iso-C4H8 (50/50, v/v), n-C4H8/iso-C4H8 (50/50, v/v), and C4H6/n-C4H8/iso-C4H8 (50/15/35, v/v/v) gas-mixtures.

Date: 2024
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DOI: 10.1038/s41467-024-46607-y

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