从C烯烃中进行异丁烯的分子筛筛选，同时实现对1,3 - 丁二烯和正丁烯的高吸附量。
Molecular sieving of iso-butene from C olefins with simultaneous high 1,3-butadiene and n-butene uptakes.
作者信息
Liu Junhui, Xiong Hanting, Shuai Hua, Liu Xing, Peng Yong, Wang Lingmin, Wang Pengxiang, Zhao Zhiwei, Deng Zhenning, Zhou Zhenyu, Chen Jingwen, Chen Shixia, Zeng Zheling, Deng Shuguang, Wang Jun
机构信息
Chemistry and Chemical Engineering School, Nanchang University, Nanchang, 330031, Jiangxi, China.
School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ, 85287, USA.
出版信息
Nat Commun. 2024 Mar 12;15(1):2222. doi: 10.1038/s41467-024-46607-y.
Iso-butene (iso-CH) is an important raw material in chemical industry, whereas its efficient separation remains challenging due to similar molecular properties of C olefins. The ideal adsorbent should possess simultaneous high uptakes for 1,3-butadiene (CH) and n-butene (n-CH) counterparts, endowing high efficiency for iso-CH separation in adsorption columns. Herein, a sulfate-pillared adsorbent, SOFOUR-DPDS-Ni (DPDS = 4,4'-dipyridyldisulfide), is reported for the efficient iso-CH separation from binary and ternary C olefin mixtures. The rigidity in pore sizes and shapes of SOFOUR-DPDS-Ni exerts the molecular sieving of iso-CH, while exhibiting high CH and n-CH uptakes. The benchmark Henry's selectivity for CH/iso-CH (2321.8) and n-CH/iso-CH (233.5) outperforms most reported adsorbents. Computational simulations reveal the strong interactions for CH and n-CH. Furthermore, dynamic breakthrough experiments demonstrate the direct production of high-purity iso-CH (>99.9%) from CH/iso-CH (50/50, v/v), n-CH/iso-CH (50/50, v/v), and CH/n-CH/iso-CH (50/15/35, v/v/v) gas-mixtures.
异丁烯（iso-C₄H₈）是化学工业中的一种重要原料，然而由于C₄烯烃分子性质相似，其高效分离仍然具有挑战性。理想的吸附剂应同时对1,3 - 丁二烯（C₄H₆）和正丁烯（n-C₄H₈）具有高吸附量，从而在吸附塔中实现异丁烯分离的高效性。在此，报道了一种硫酸盐柱撑吸附剂SOFOUR-DPDS-Ni（DPDS = 4,4'-二吡啶二硫化物），用于从二元和三元C₄烯烃混合物中高效分离异丁烯。SOFOUR-DPDS-Ni的孔径和形状的刚性实现了对异丁烯的分子筛作用，同时对C₄H₆和n-C₄H₈表现出高吸附量。C₄H₆/异丁烯（2321.8）和n-C₄H₈/异丁烯（233.5）的基准亨利选择性优于大多数已报道的吸附剂。计算模拟揭示了对C₄H₆和n-C₄H₈的强相互作用。此外，动态突破实验表明可从C₄H₆/异丁烯（50/50，v/v）、n-C₄H₈/异丁烯（50/50，v/v）和C₄H₆/n-C₄H₈/异丁烯（50/15/35，v/v/v）气体混合物中直接生产高纯度异丁烯（>99.9%）。
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