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基于对醋酸甲酯与甲醇二元共沸特性的分析,提出热集成变压精馏分离醋酸甲酯和甲醇的工艺.利用AspenPlus软件对该分离过程进行模拟,以NRTL活度系数方程为物性计算方法,其二元相互作用参数由气液相平衡数据回归,分析了加压塔和常压塔的理论板数、进料位置及回流比对分离效果的影响,并进行了能耗比较.结果表明,该工艺能很好地分离醋酸甲酯和甲醇,较佳的工艺条件为:加压塔操作压力909kPa,理论板数32,第21块板进料,回流比4.2,塔釜醋酸甲酯纯度99.8%;常压塔操作压力101kPa,理论板数30,第20块板进料,回流比4.6,塔釜甲醇纯度99.0%.与常规变压精馏相比,热集成变压精馏可节能达45.8%;与以水为萃取剂的萃取精馏分离工艺相比,热集成变压精馏分离工艺更适合醋酸甲酯与甲醇体系的分离.
Based on the analysis of binary azeotrope of methyl acetate and methanol, the process of separation of methyl acetate and methanol by thermal integrated pressure swing distillation was proposed. The separation process was simulated by AspenPlus software and the NRTL activity coefficient equation Method, the binary interaction parameters are regressed from the gas-liquid equilibrium data, the effects of theoretical plate number, feed position and reflux ratio on the separation efficiency are analyzed, and the energy consumption is compared.Results The results show that the process can separate methyl acetate and methanol well. The optimum conditions are as follows: the operating pressure of the pressure column is 909kPa, the theoretical plate number is 32, the feed of the 21th plate, the reflux ratio is 4.2, The purity of 99.8%; atmospheric pressure column operating pressure 101kPa, the theoretical plate number 30, the first 20 plate feed, reflux ratio 4.6, the purity of the column reactor methanol 99.0%. Compared with conventional pressure distillation, thermal integrated pressure distillation can be Saving up to 45.8%. Compared with the extractive distillation separation process using water as the extractant, the thermal integrated pressure swing distillation separation process is more suitable for the separation of methyl acetate and methanol systems.