A systematic design and optimization method for vinyl acetate/acetic acid/acetic anhydride ternary system separation processes is proposed. Herein, four separation schemes including the conventional distillation, the inter-column mechanical vapor recompression heat pump distillation (IMVRHP), the double mechanical vapor recompression heat pumps distillation (DMVRHPs), and DMVRHPs with heat exchange network (DMVRHPs-HEN) are conducted. The optimal separation process is determined by minimizing the total annual cost (TAC) and CO₂ emission. As a result, the three designed mechanical vapor recompression heat pump distillation (MVRHP) processes show better performance in all aspects than conventional distillation process. Specifically, the DMVRHPs-HEN scheme saves 89.75% of the CO₂ emission and 0.09% of the TAC compared with conventional distillation process. More important, the TACs of DMVRHPs-HEN are decreased by 22.21% and 57.69% compared with those of conventional distillation process when the payback period is 5 and 8 years, respectively. This research is expected to provide theoretical guidance for the energy saving scheme of vinyl acetate/acetic acid/acetic anhydride ternary system.

中文翻译：

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通过具有热交换网络的热泵减少醋酸乙烯/醋酸/醋酸酐三元混合物的二氧化碳排放量和工艺成本

提出了醋酸乙烯/醋酸/醋酸酐三元体系分离工艺的系统设计与优化方法。在这里，进行了四种分离方案，包括常规精馏、柱间机械蒸汽再压缩热泵精馏（IMVRHP）、双机械蒸汽再压缩热泵精馏（DMVRHPs）和带热交换网络的 DMVRHPs（DMVRHPs-HEN）。最佳分离过程是通过最小化年度总成本 (TAC) 和 CO ₂排放来确定的。因此，三种设计的机械蒸汽再压缩热泵蒸馏 (MVRHP) 工艺在各个方面都表现出比传统蒸馏工艺更好的性能。具体来说，DMVRHPs-HEN方案节省了89.75%的CO ₂排放量和 0.09% 的 TAC 与传统蒸馏工艺相比。更重要的是，当投资回收期为5年和8年时，DMVRHPs-HEN的​​TAC与传统蒸馏工艺相比分别降低了22.21%和57.69%。该研究有望为醋酸乙烯/醋酸/醋酸酐三元体系的节能方案提供理论指导。