Selection of a suitable solvent is the key for the extraction process. In this work, four ionic liquids were selected as solvent for extracting butanol, the ternary liquid–liquid equilibria (LLE) data for systems of heptane + butanol + {[HMIM][BF₄] (1-hexyl-3-methylimidazolium tetrafluoroborate), [OMIM][BF₄] (1-octyl-3-methylimidazolium tetrafluoroborate), [HMIM][OTf] (1-hexyl-3-methylimidazolium trifluoromethansulfonate), and [HMIM][NTf₂] (1-hexyl-3-methylimidazolium bis((trifluoromethyl)sulfonyl)imide)} were measured at 298.15 K and atmospheric pressure. The extraction capacity of four ILs in the separation of butanol from heptane + butanol mixture was estimated by the selectivity (S) and solute distribution ratio (β), and the influence of the structure and anion of IL on the extraction efficiency was investigated. The experimental LLE data were correlated by using NRTL and UNIQUAC models.

中文翻译：

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离子液体从庚烷+丁醇混合物中液体萃取丁醇

选择合适的溶剂是萃取过程的关键。在这项工作中，选择了四种离子液体作为萃取丁醇的溶剂，庚烷+丁醇+ {[HMIM] [BF ₄ ]（1-己基-3-甲基咪唑四氟硼酸酯）的三元液-液平衡（LLE）数据，[OMIM] [BF ₄ ]（1-辛基-3-甲基咪唑四氟硼酸酯），[HMIM] [OTf]（1-己基-3-甲基咪唑三氟甲磺酸酯）和[HMIM] [NTf ₂ ]（1-己基-3在298.15K和大气压下测量-甲基咪唑双（（三氟甲基）磺酰基）亚胺）。通过选择性估算四种ILs从庚烷+丁醇混合物中分离丁醇的萃取能力（S。）和溶质分布比（β），以及IL的结构和阴离子对萃取效率的影响。通过使用NRTL和UNIQUAC模型将实验LLE数据进行关联。