An approach to optimal design of pressure-swing distillation for separating azeotropic ternary mixtures

摘要

The separation of ternary mixture with azeotropes by distillation into three high-purity products is difficult due to the existence of distillation boundaries.However,combinations of pressure swing distillation(PSD)configurations and recycle streams can provide alternatives for feasible pathways to the separation of the mixtures.In this work,a two-step approach is proposed to the optimal design of pressure swing distillation system to separate azeotropic ternary mixtures.An example of separating a ternary mixture with azeotropes of C2H5OH/C4H8O-01/C4H8O-02 is used for illustrating and validating the proposed method.