【摘要】 应用UNIFAC基团贡献法推导出的萃取剂选择模型,选出异丙苯、对叔丁基甲苯、对二乙基苯为乙腈-甲苯体系的萃取剂,通过气液平衡试验测定了乙腈-甲苯体系和乙腈-甲苯在萃取剂存在下的气液平衡关系,并应用UNIFAC活度系数模型进行气液平衡计算。通过间歇萃取精馏试验考察了不同萃取剂的效果,结果表明,对二乙基苯是最佳的萃取剂,同时研究了回流比、溶剂比对间歇萃取精馏的影响。更多还原

【Abstract】 Isopropylbenzene,4-tert-butyltoluene and 1,4-diethybenzene were selected as solvents for separation of acetonitrile-toluene mixture by batch extractive distillation according to a model derived from UNIFAC group contribution method.The vapor-liquid equilibria of acetonitrile-toluene system and acetonitrile-toluene with different solvents were measured by the vapor-liquid equilibria experiments,and the vapor-liquid equilibria of those systems were also calculated using UNIFAC group contribution method to calculate activity coefficients.Different solvents were investigated experimentally by batch extractive distillation,the results show that 1,4-diethybenzene is the optimal solvent for such process. The effects of reflux ratio and solvent ratio were also studied for batch extractive distillation.更多还原