Highly Selective Removal of Trace Isomers by Nonporous Adaptive Pillararene Crystals for Chlorobutane Purification,Journal of the American Chemical Society

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Highly Selective Removal of Trace Isomers by Nonporous Adaptive Pillararene Crystals for Chlorobutane Purification
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2020-03-26 , DOI: 10.1021/jacs.0c02684
Yujuan Zhou ₁ , Kecheng Jie ₁ , Run Zhao ₁ , Errui Li ₁ , Feihe Huang ₁

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Removal of trace chlorobutane (CB) isomers is highly desired to produce high grade 1-chlorobutane (1-CB) and 2-chlorobutane (2-CB). Here we report that nonporous adaptive crystals (NACs) of perethylated pillar[5]arene (EtP5) and pillar[6]arene (EtP6) effectively remove trace CB isomers. EtP5 NACs can remove trace 1-CB (2%) from 2-CB to improve its purity from 98.0% to 99.9%, while EtP6 NACs can remove trace 2-CB from 1-CB to improve its purity from 98.0% to 99.9%. The adsorption of trace CB isomers results in the formation of new CB-loaded crystal structures, whose thermostability is higher than their corresponding isomer-loaded structures. This determines the selectivity of NACs towards the trace CB isomers. Reversible transformations between nonporous guest-free and guest-loaded structures make EtP5 and EtP6 highly recyclable.

中文翻译：

用于氯丁烷纯化的无孔自适应柱芳烃晶体高选择性去除痕量异构体

非常需要去除痕量氯丁烷 (CB) 异构体以生产高品位 1-氯丁烷 (1-CB) 和 2-氯丁烷 (2-CB)。在这里，我们报告了全乙基化柱 [5] 芳烃 (EtP5) 和柱 [6] 芳烃 (EtP6) 的无孔自适应晶体 (NAC) 可有效去除痕量 CB 异构体。EtP5 NACs可以去除2-CB中的微量1-CB（2%），将其纯度从98.0%提高到99.9%，而EtP6 NACs可以去除1-CB中的微量2-CB，将其纯度从98.0%提高到99.9% . 微量CB异构体的吸附导致形成新的负载CB的晶体结构，其热稳定性高于其相应的负载异构体的结构。这决定了 NAC 对痕量 CB 异构体的选择性。无孔无客体结构和载客体结构之间的可逆转换使 EtP5 和 EtP6 高度可回收。

更新日期：2020-03-26

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