Abstract: In order to achieve a rapid and accurate selection for extractive distillation solvent, and to acquire 1,2,3-trimethylbenzene with high purity from solvent oil via extractive distillation, the UNIFAC model was used to calculate the relative volatility of 1,2,3-trimethylbenzene to indane (the mass ratio of 1,2,3-trimethylbenzene to indane is 4∶1) in five different solvents, acetophenone, di-2-octylhexyl phthalate(DOP), glycol, dimethyl sulfoxide（DMSO），sulfolane at 17.47 kPa. Meanwhile, the isobaric vapor-liquid equilibrium data of these five systems were measured. Deviations of the calculated values with the experimental values were all less than 6％. The results showed that sulfolane is a suitable extractive distillation solvent. Compared with other methods for selecting extractive distillation solvent，the combination of the UNIFAC model with experiments proposed in this paper has the advantages of rapidity, accuracy and high efficiency.

摘要： 为了快速准确地选择萃取精馏溶剂，由190#溶剂油萃取精馏获取高纯度连三甲苯，运用UNIFAC模型,计算了质量比为4∶1的连三甲苯-茚满体系在苯乙酮、乙二醇、邻苯二甲酸二辛酯、二甲基亚砜和环丁砜5种溶剂中在17.47 kPa下的相对挥发度。同时测定了对应5个体系的汽液平衡数据，计算值和实验值的相对平均偏差均小于6％，两者吻合良好。结果表明：环丁砜较适宜作为萃取剂。与其它萃取剂选择方法比较，这种UNIFAC模型预测和实验验证相结合的方法具有快速准确的优点。