In this study, we proposed and compared extractive distillation, extractive pressure-swing distillation (EPSD), and pressure-swing distillation (PSD) techniques for the efficient separation of the ethyl acetate/ethanol/cyclohexane pressure-sensitive azeotropic mixture. Based on the influence of the extractant on the relative volatility and the analysis of the ternary phase diagram, dimethyl sulfoxide was selected as the extractant for extractive distillation. The pressure range for PSD was also determined. We employed the non-dominated sorting genetic algorithm II to optimize different processes, considering equipment and operation costs as the objective functions. After the multi-objective optimization, the decision solution was selected using the minimum distance method. A heat exchange network was also used to explore the energy-saving effects of different processes. The aforementioned processes were comprehensively evaluated based on economic, energy, environmental, and exergy analyses. The process results were correlated with the phase diagram based on the normal distance. The total annual cost, energy consumption, gas emissions, and energy loss of the improved processes decreased by more than 10%, 15%, 16%, and 3%, respectively, compared to those of the conventional process. Among the conventional and improved processes, EPSD and heat-integrated EPSD were identified as the best, respectively.

中文翻译：

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基于萃取和变压特性的乙酸乙酯/乙醇/环己烷分离不同精馏的工艺设计和4E分析


在这项研究中，我们提出并比较了萃取精馏、萃取变压蒸馏（EPSD）和变压蒸馏（PSD）技术，用于有效分离乙酸乙酯/乙醇/环己烷压敏共沸混合物。根据萃取剂对相对挥发度的影响以及三元相图分析，选择二甲亚砜作为萃取精馏的萃取剂。 PSD 的压力范围也已确定。我们采用非支配排序遗传算法II来优化不同的工艺，以设备和运营成本为目标函数。多目标优化后，采用最小距离法选择决策解。还利用热交换网络来探索不同工艺的节能效果。基于经济、能源、环境和火用分析对上述工艺进行了综合评价。将处理结果与基于法向距离的相图相关联。与传统工艺相比，改进工艺的年总成本、能耗、气体排放和能量损失分别降低了10%、15%、16%和3%以上。在传统工艺和改进工艺中，EPSD 和热集成 EPSD 分别被认为是最好的。