Pressure-swing distillation is widely studied in academia and industry. Energy consumption is a key criterion for judging whether a pressure-swing distillation is better than other distillation methods. An improved process with an intermediate connection was developed based on the two-column pressure-swing distillation for separating a binary azeotropic mixture to save energy and reduce the total annual cost. The proposed pressure-swing distillation was applied to three case systems, two minimum-boiling azeotropic mixtures of ethyl acetate/ethanol and methanol/chloroform and one maximum-boiling azeotropic mixture of ethylenediamine/water. According to our analysis, the proposed pressure-swing distillation and heat-integrated scheme can reduce energy consumption and total annual cost. The pressure-swing distillation with the intermediate connection is promising for saving energy. This advantage assists in promoting the application of pressure-swing distillation and overall energy savings in the chemical process industry.

变压蒸馏在学术界和工业界得到了广泛的研究。能耗是判断变压蒸馏是否优于其他蒸馏方法的关键标准。基于两塔变压蒸馏技术，开发了一种中间连接的改进工艺，用于分离二元共沸混合物，从而节省了能源并降低了年度总成本。拟议的变压蒸馏应用于三种情况的系统，两种最低沸点的乙酸乙酯/乙醇和甲醇/氯仿的共沸混合物，以及一种最大沸点的乙二胺/水的恒沸混合物。根据我们的分析，所提出的变压蒸馏和热集成方案可以降低能耗和每年的总成本。中间连接的变压蒸馏有望节省能源。这一优势有助于促进变压蒸馏的应用，并在化学过程工业中节省总体能源。