This study evaluated the energy saving potential of process intensified double column reactive extractive distillation (DC-RED) through three case studies. The results showed that process intensified technologies, thermally coupled reactive extractive distillation (TC-RED) and dividing wall reactive extractive distillation (DW-RED), did not yield any energy savings compared to conventional DC-RED. Contrary to the expectation, the elimination of the remixing effect in the process intensified DC-RED did not lead to any energy savings. Further analysis revealed that the remixing effect was not significant enough to achieve energy savings through process intensification, and the strong reaction exotherm in DC-RED reduced the potential for energy saving. Additionally, the higher interconnection flowrate in TC-RED and DW-RED resulted in higher energy consumption due to the increased boil-up ratio. Moreover, the lower feed temperature to the solvent recovery column (SRC) led to less energy efficiency and larger reboiler duty. An alternative energy saving scheme was proposed by adding a heat exchanger (HEX). The addition of HEX led to energy savings of 37.23 % in Acetonitrile (ACN)/Isopropanol (IPA)/Water separation, 45.62 % in Ethyl Acetate (EA)/Ethanol (EtOH)/Water separation, and 39.21 % in IPA/EA/Water separation.

本研究通过三个案例研究评估了过程强化双塔反应萃取精馏（DC-RED）的节能潜力。结果表明，与传统的 DC-RED 相比，过程强化技术、热耦合反应萃取蒸馏 (TC-RED) 和间壁反应萃取蒸馏 (DW-RED) 并未产生任何节能效果。与预期相反，在强化 DC-RED 过程中消除再混合效应并没有带来任何节能效果。进一步分析表明，再混合效果不足以通过过程强化实现节能，并且DC-RED中的强烈反应放热降低了节能潜力。此外，TC-RED 和 DW-RED 中较高的互连流量由于沸腾比的增加而导致较高的能耗。此外，溶剂回收塔 (SRC) 的进料温度较低会导致能源效率较低和再沸器负荷较大。通过添加热交换器（HEX）提出了替代节能方案。添加 HEX 使乙腈 (ACN)/异丙醇 (IPA)/水分离节能 37.23%，乙酸乙酯 (EA)/乙醇 (EtOH)/水分离节能 45.62%，IPA/EA/水分离节能 39.21%水分离。