Ionic liquid is an ideal candidate in the extraction of aromatic compounds. The design and construction of ionic liquids with high extraction efficiency and selectivity towards to the specific aromatics remain crucial question. In this paper, with the aid of orthogonal array experiment, the imidazolium-based ionic liquids with long alkyl chain on the cations were determined to possess high aromatics extraction efficiency. Furthermore, the Lewis acid anion was introduced into the ionic liquid to form 1-dodecyl-3-methylimidazolium ferric chloride ([Cmim][FeCl]) and performed 62 % and 100 % extractant efficiency of naphthalene (NAP) and anthracene (ANT), respectively. Then the porous carbon materials (P1-1000) derived from hyper-crosslinked porous polymers (HCP) which possessed high BET surface area (1186 m/g) was dispersed in [Cmim][FeCl] to form porous ionic liquid. The single extraction efficiency of NAP improved from 62 % to 77 %. The great single extraction efficiency was attributed to the high porosity, additional adsorption sites provided by the Lewis acid anions and the hydrophobic long alkyl chain on the cations. After three times extraction, the concentration of NAP dropped down to 0. The porous ionic liquids also showed good recycle performance. The construction of porous ionic liquids provided an efficient approach for extraction of polycyclic aromatic hydrocarbons from aliphatic hydrocarbon.

中文翻译：

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将多孔碳材料掺入离子液体中高效萃取多环芳烃


离子液体是芳香族化合物萃取的理想选择。具有高萃取效率和对特定芳烃的选择性的离子液体的设计和构建仍然是关键问题。本文借助正交阵列实验，确定了阳离子上长烷基链的咪唑基离子液体具有较高的芳烃萃取效率。此外，将路易斯酸阴离子引入离子液体中形成1-十二烷基-3-甲基咪唑氯化铁([Cmim][FeCl])，对萘(NAP)和蒽(ANT)的萃取效率分别为62%和100% ， 分别。然后将具有高BET表面积（1186 m/g）的源自超交联多孔聚合物（HCP）的多孔碳材料（P1-1000）分散在[Cmim][FeCl]中以形成多孔离子液体。 NAP的单次提取效率从62%提高到77%。较高的单次萃取效率归因于高孔隙率、路易斯酸阴离子提供的额外吸附位点以及阳离子上的疏水性长烷基链。经过3次萃取后，NAP的浓度降至0。多孔离子液体也表现出良好的回收性能。多孔离子液体的构建为从脂肪烃中萃取多环芳烃提供了一种有效的方法。