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Application of an Energy-Efficient Process with Reactive Coupling Pressure-Swing Distillation for Recycling Organic Materials from Wastewater

Yudong Li, Tianyi Sun, , Jinlong Li, Yinggui Xu, Xue Jian

Abstract: A sustainable reactive coupling pressure-swing distillation process is investigated to separate the acetonitrile/isopropanol/water ternary mixture. To solve the problem of high energy consumption in this process, the application of heat integration and heat pump technologies on the basis of the reactive coupling pressure-swing distillation process are explored to achieve further energy saving. The results showed that the processes with heat pump have the better potential for energy reduction. Comparative analysis from the aspects of exergy, energy consumption, cost, and gas emission are conducted to evaluate the thermodynamic efficiency and economic and environmental improvement potential of the proposed processes. The reactive coupling pressure-swing distillation process in combination with a single heat pump, RPSDL-SHP, exhibits the best economic performance and 48.51% reduction in the total annual cost and 70.04% energy saving in comparison with the conventional process. The total exergy efficiency of RPSDL-SHP is up to 97.92%, which means that application of heat pump is feasible to save energy, reduce the cost of the process, and enhance exergy efficiency.
Keywords: energy saving / distillation / heat pump / application of heat / SHP / RPSDL / pressure swing

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