The new intensified strategy can be used in special distillation processes to achieve energy savings. Through analyzing the influence of different extractants and pressure on the separation performance of n-hexane-tetrahydrofuran-ethanol. system, extractive pressure-swing distillation process (EPSD) using dimethyl sulfoxide as extractant was proposed. Multi-objective optimization was performed to definite the best operating parameters of EPSD. Based on the phenomenon that the temperature of high-temperature column top is lower than low-temperature column bottom, making it impossible to perform traditional thermal integration, an intermediate heat exchange intensified process (IHE-EPSD) was developed. The performance influencing factors and heat exchange network of IHE-EPSD were analyzed to obtained the optimal IHE-EPSD process. Three heat integration schemes of the IHE-EPSD were designed to further save energy consumption. Finally, the processes were assessed from economy, energy, environment and exergy. The results indicate that the IHE-EPSD process exhibits excellent separation performance, achieving the efficient separation of n-hexane-tetrahydrofuran-ethanol.

中文翻译：

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高效分离正己烷-四氢呋喃-乙醇的新型中间热交换强化萃取变压精馏工艺


新的强化策略可用于特殊的蒸馏过程，以实现节能。通过分析不同萃取剂和压力对正己烷-四氢呋喃-乙醇分离性能的影响。系统中，提出了以二甲亚砜为萃取剂的萃取变压精馏工艺（EPSD）。进行多目标优化以确定 EPSD 的最佳运行参数。针对高温塔顶温度低于低温塔底温度，无法进行传统热集成的现象，开发了中间换热强化工艺（IHE-EPSD）。对IHE-EPSD的性能影响因素和换热网络进行分析，得到最佳的IHE-EPSD工艺。 IHE-EPSD设计了三种热集成方案，以进一步节省能源消耗。最后从经济、能源、环境、火用等方面对工艺进行了评价。结果表明，IHE-EPSD工艺表现出优异的分离性能，实现了正己烷-四氢呋喃-乙醇的高效分离。