关键词: 乙醇-甲苯, 热集成, 变压精馏, 模拟优化, 节能

Abstract: Pressure swing distillation process with heat integration was proposed for separation of the ethanol-toluene mixture because of its pressure sensitivity. Vapor-liquid equilibria（VLE）data for the toluene-ethanol mixture were measured using a VLE recirculating still. The experimental data verified that NRTL model can be successfully applied to VLE prediction of this system. The optimum simulation was performed using the RadFrac pattern of Aspen Plus and NRTL equation，aiming at minimizing the energy consumption at fixed purities of ethanol and toluene. Due to relatively low boiling point of ethanol-toluene mixture，high-low pressure columns were selected. The optimal process parameters such as the total number of theoretical plate，reflux ratio，feeding position，operating pressure and circulating ratio were specified by using optimizing analysis. The obtained purities and the yields of the products were more than 99.9%. The results showed that pressure swing distillation process with heat integration can save 49% of energy compared with traditional pressure swing distillation.

Key words: ethanol-toluene, heat integration, pressure swing distillation, simulation and optimization, energy-saving