Abstract:

The design and optimization procedures of a heterogeneous thermally coupled azeotropic distillation sequence（TCADS）were investigated for isopropanol dehydration. These procedures can be applied to retrofit a conventional two-column azeotropic distillation sequence to a TCADS and guarantee the optimal values of the design variables. Both the conventional azeotropic distillation sequence and TCADS for isopropanol dehydration were simulated with Aspen Plus. Results showed that not only higher thermodynamic efficiency but also reductions in energy consumption and CO₂ emissions could be achieved by TCADS.

摘要：

以异丙醇脱水为例提出了一种热耦合共沸精馏序列的设计和优化方法，应用该方法可以将常规的双塔共沸精馏序列转化为热耦合共沸精馏序列并保证各操作参数的最优值。同时，利用Aspen Plus 模拟软件，对异丙醇脱水的常规共沸精馏序列和热耦合共沸精馏序列进行了模拟分析。结果表明，热耦合共沸精馏序列不但提高了热力学效率、降低了能耗，并且能较大幅度地减少CO₂排放量。