引言 近年来,与离子液体在分离过程中作为溶剂通过吸收或萃取实现清洁分离相关的报道已有许多。溶质进入离子液体相之后,怎样将溶质和离子液体分开;以离子液体为化学反应介质时如何将反应产物和离子液体分开而同时保持催化剂不流失,都需要大量而准确的相平衡数据。目前,广大离子液体工作者已经得到了许多关于离子液体与醇类、低碳芳烃、烷烃及醚类等物质的液液、液固相平衡数据,而且用WILSON、NRTL和UNIQUAC方程对部分数据进行了关联。但文献中的数据并不完全一致。其中,离子液体纯度互不相同是主要因素之一;所用分析方法的局限性则是另一原因。本文针对以上两个问题,采用超临界CO2萃取的方法得到高纯的离子液体,同时建立了一系列测定离子液体以及其中芳香类高沸点有机物的HPLC分析方法,测得了一系列的固液、液液平衡数据,并用NRTL方程进行了关联。
Dialkylimidazolium ionic liquids (ILs) [bmim] PF6, [bmim] BF4, and alkylpyridine IL [bupy] BF4 were obtained by super critical fluid (SCF) CO2 extraction. The solubilities of naphthalene, phenanthrene, diphenyl, DBT and diphenyldisulfide in [bmim] PF6, [bmim] BF4 and [bupy] BF4, akylbenzene in [bmim] PF6 and [bmim] PF6 in akylbenzene were determined by high performance liquid chromatography (HPLC). Solubility experimental data of solid liquid equilibrium (SLE) were correlated by means of NRTL equation. The results indicate that NRTL is appropriate for the behaviour of these SLE and the average deviation is 3.86%-9.94%.