Abstract
The triple-column pressure-swing distillation (TPSD) and novel azeotropic combining pressure-swing distillation (APSD) processes were designed for separating the n-propanol/water/tetrahydrofuran ternary mixture. The application of heat-integration and vapor-recompressed heat pump technologies in the abovementioned processes were explored to achieve energy conservation. The total annual cost (TAC), total energy consumption (TEC), gas emission, and exergy analysis were conducted to evaluate the proposed processes. APSD displayed a greater economic performance when compared with TPSD. The ADLH-VR-HI exhibited the highest energy and economic performance. It also showed a 54.32 % reduction in the TAC and 67.19 % reduction in the TEC when compared with TPSD. The total exergy efficiency of the ADLH-VR-HI process was 6.02 %, which indicated that applying heat-integration and vapor-recompressed heat pump is suitable for saving energy and improving exergy efficiency.
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