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在分析甲缩醛和甲醇二元体系共沸特性基础上,提出热集成变压精馏分离甲缩醛和甲醇共沸体系的工艺方法。利用AspenPlus软件对该分离过程进行模拟计算,采用NRTL方程作为物性计算模型,其二元交互作用参数由汽液相平衡数据回归,详细分析了加压塔和常压塔的理论板数、进料位置和回流比对分离过程的影响,并进行能耗比较。结果表明,采用热集成变压精馏分离工艺,可很好地实现甲缩醛与甲醇的分离,较佳的操作条件为:加压塔操作压力1.0MPa,理论板数28,第18块板进料,回流比3.2,塔釜甲缩醛含量可达99.9%;常压塔操作压力0.1 MPa,理论板数24,第14块板进料,回流比2.6,塔釜甲醇含量可达99.5%。与常规变压精馏相比较,热集成变压精馏可节省能耗达35.5%,为共沸物分离过程的设计和改造提供依据。
Based on the analysis of azeotropic characteristics of methylal and methanol binary system, a process of separation of methylal and methanol azeotropic system by thermal integrated pressure swing distillation was proposed. The AspenPlus software was used to simulate the separation process. The NRTL equation was used as the physical property calculation model. The binary interaction parameters were obtained from the vapor-liquid equilibrium data. The theoretical plate number of the pressure tower and the atmospheric tower were analyzed in detail. The location and the reflux ratio on the separation process, and compare energy consumption. The results show that the separation process of methylal and methanol can be achieved well by using the method of thermal integrated pressure swing distillation. The optimum operating conditions are as follows: the operating pressure of the pressure tower is 1.0MPa, the theoretical plate number is 28, the 18th plate Feed, the reflux ratio of 3.2, tower reactor methylal content of up to 99.9%; atmospheric tower operating pressure of 0.1 MPa, the theoretical plate number 24, the first 14 plate feed, reflux ratio of 2.6, the column reactor methanol content of up to 99.5% . Compared with the conventional pressure distillation, thermal integrated pressure swing distillation can save energy by 35.5%, providing the basis for the design and modification of the azeotrope separation process.