新疆煤炭资源丰富，煤化工、煤焦化等项目每年都产生大量焦化苯（CB）。作为工业生产用苯的重要来源，CB中含有多种烷烃及烯烃及噻吩等可与苯形成共沸物，普通精馏方法难以达到有效分离。并且，传统上采用硫酸洗涤和催化加氢等方法脱噻吩未加以回收利用，不仅造成资源浪费还会对生态环境产生威胁。采取萃取精馏法则可解决该问题，关键在选取适合的萃取精馏剂。与有机溶剂相比，离子液体（ILs）不挥发、选择性好、性质可调、环境友好，使其成为优良的“绿色”萃取精馏剂来源。.本题通过反气相色谱法测定系列ILs的热力学参数，针对CB萃取精馏实验的四个阶段分别选取ILs萃取精馏剂，通过汽液平衡法建立ILs参与下的热力学模型，并经相应实验探索ILs热力学性质与精馏成分的关系。此外，还通过调整ILs萃取精馏剂的阴阳离子组成、二元混合ILs、ILs复合有机溶剂等方式，实现在更大范围内对萃取精馏体系进行调控。

Xinjiang is in rich coal resources, and a large number of coking crude produced in coal chemical industry and coal coking industry every year. As an important source of producing benzene, coking benzene always contains alkanes, alkenes and thiophene, which could form azeotropic mixture with benzene. The mixture which have a similar boiling point or forms azeotropic liquid cannot be separated by normal distillation, but the extractive distillation sometimes can solve this problem. The thiophene in coking benzene has not been recycled in both sulfuric acid washing method and catalytic hydrogenation method. The wastes of desulfurization in both methods are not only wasting of the high value resources but also a potential threat to the entironment of Xinjiang. The key of the extractive distillation is the choice of solvent. Comparing with the conventional organic solvents, ionic liquids (ILs) have non-volatile, good solvent selectivity，adjustable structural and environmental-friendly properties, which makes it a potentially excellent “green”distillation extraction solvent. .The aim of this project is to determine thermodynamic parameters of a series of ILs by inverse gas chromatography, such as infinite dilution activity coefficient, solubility coefficient, selection coefficient, and so on. Then，ILs were selected as the solvents by the experiments for the four parts of the extractive distillation process, including the process of removing toluene and xylene，the process of removing alkanes and alkenes, the process of refining benzene and the process of purifying thiophene. The simulation model of extractive distillation of coking benzene was also established by the data obtained from the vapor-liquid equilibrium experiments. In order to explore the relationship between the thermodynamic parameters of ILs and the components of distillation, four extractive distillation experiments were taken. In addition, some methods were taken to enlarge the adjustment of ILs thermodynamic parameters to obtain the adaptive solvent for the extractive distillation including changing consists of the ions, mixing two type of ILs, adding ILs to organic solvents together.