The removal of heterocyclic impurities from toluene in the petrochemical industry is necessary but challenging. Herein, we provide a convenient and environmentally friendly adsorptive separation strategy using nonporous adaptive crystals of perethylated pillar[6]arene (EtP6). These crystals show a highly selective preference for heterocyclic compounds, and are capable of selectively adsorbing them from a mixture of toluene and heterocyclic compounds, ultimately improving the purity of toluene from 96.78% to 99.00%. Single crystal structures indicate that the selectivity derives from the differences in the structural stability of the guest-loaded EtP6 crystals.

中文翻译：

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全乙基化柱[6]芳烃的无孔自适应晶体从甲苯中选择性去除杂环杂质

在石油化学工业中，从甲苯中去除杂环杂质是必要的，但具有挑战性。在本文中，我们提供了一种使用全乙基化柱[6]芳烃（EtP6）的无孔自适应晶体的便捷，环保的吸附分离策略。这些晶体显示出对杂环化合物的高度选择性偏好，并且能够从甲苯和杂环化合物的混合物中选择性地吸附它们，最终将甲苯的纯度从96.78％提高到99.00％。单晶结构表明选择性来自于客体加载的EtP6晶体的结构稳定性差异。