烯烃纤维
吸附
石油化工
乙烯
化学工程
材料科学
化学
红外光谱学
有机化学
催化作用
工程类
作者
Yong Peng,Hanting Xiong,Peixin Zhang,Zhiwei Zhao,Xing Liu,Shihui Tang,Yuan Liu,Zhenliang Zhu,Weizhen Zhou,Zhenning Deng,Junhui Liu,Yao Zhong,Zhenhua Wu,Jingwen Chen,Zhenyu Zhou,Shixia Chen,Qiang Deng,Jun Wang
标识
DOI:10.1038/s41467-024-45004-9
摘要
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 = BF 4 - , dpds = 4,4’-bipyridinedisulfide), is reported for simultaneous sieving of C 2 -C 4 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 (C 2 H 4 /C 2 H 6 /C 3 H 6 /C 3 H 8 /n-C 4 H 8 /n-C 4 H 10 ), 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.
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