带有整流器的侧线精馏塔分离甲苯-正庚烷的模拟与优化

In order to separate the system of n-heptane-toluene,the separating process of distillation and sidestream distillation with rectifier were put forward.The separating processes were simulated and optimized distillation with the software of Aspen plus. The effects of the process parameters on the purity of product and energy consumption were investigated. The results show that under the condition of product purity requirement and lower energy consumption,the method of sidestream distillation with rectifier was better than extractive distillation,using sulfolane as solvent,when the flow of the extraction agent was 1200kg/h, main theoretical stage number was 28, feed stage was 15, the extractant feed position stage was 5, the main column reflux was 1.6, sidestream theoretical tray number was 10 and sidestream flow rate is 600kg/h, the purity of toluene and n-heptane product can reach 0.999. The sidestream distillation with rectifier was more energy saving than extractive distillation.The energy consumption can be saved further,due to the bottom of cycle extraction agent and feed materiel for heat transfer.This study will have a theoretical guiding significance to the industrial separation process for n-heptane-toluene azeotrope mixture.