Energy-efficient extractive distillation combined with heat-integrated and intermediate reboilers for separating acetonitrile/isopropanol/water mixture

Towards sustainable separation of the ternary azeotropic mixture based on the intensified reactive-extractive distillation configurations and multi-objective particle swarm optimization

Design and optimization for the separation of tetrahydrofuran/isopropanol/water using heat pump assisted heat-integrated extractive distillation

Sustainable design and multi-objective optimization of eco-efficient extractive distillation with single and double entrainer(s) for separating the ternary azeotropic mixture tetrahydrofuran/ethanol/methanol

Multi-objective optimization and control strategy for extractive distillation with dividing-wall column/pervaporation for separation of ternary azeotropes based on mechanism analysis

Improving the economy and energy efficiency of separating water/acetonitrile/isopropanol mixture via triple-column pressure-swing distillation with heat-pump technology

Novel methodology for determining the optimal vapor recompressed assisted distillation process based on economic and energy efficiency

A heat pump is applied in pressure-swing distillation (PSD) for separating an isobutanol/isobutyl acetate mixture in this paper. To ensure dry compression and prevent compressor damage, a preheater is added before the compressor based on the dry fluid property of the isobutanol/isobutyl acetate mixture. In addition, the optimal preheated temperature of the overhead vapor stream may further improve the performance of the heat pump-assisted PSD process. Through optimization and analysis, the optimum superheat values of overhead vapor streams from two columns are 12 and 8.4 °C, respectively. The coefficients of performance of heat pumps achieve maximum values of 17.18 and 20, and the total annual cost of the process is minimum. Moreover, a heat exchanger network (HEN) is applied in the heat pump with preheater-assisted PSD (HPPSD) to reduce the use of steam in preheaters. Compared with the conventional PSD, the total annual costs, energy consumption, and CO₂ emission of the HPPSD-HEN process are decreased by 69.8, 83.99, and 79.58%, respectively.

Performance Enhancement of Heat Pump with Preheater-Assisted Pressure-Swing Distillation Process

In this work, the design that integrated vapor recompression heat pump into reactive divided-wall column (RDWC-HP) is proposed for the synthesis of isobutyl acetate. Due to the large differential temperature between the overhead vapor stream and bottom stream in the reactive distillation column, five different RDWC-HP processes are designed, in which the compressed stream provides heat in the single side reboiler or double side reboiler or interreboiler. The total annual cost, energy consumption and CO2 emission are the rules to evaluate all processes. Compared with the corresponding reactive divided-wall column (RDWC) process, the five RDWC-HP processes show better performance as aspect of energy consumption and total annual cost. The result indicates the RDWC-HP scheme that the compressed stream exchanges heat with the bottom reboilers of reactive distillation column and separation column saves 26.26 % of the energy consumption, 87.05 % of the CO2 emission and 20.68 % of the total annual cost with a payback period of 5 years, when compared with the corresponding RDWC process.

Lijuan Chen

Papers

Improving the economy and energy efficiency of separating water/acetonitrile/isopropanol mixture via triple-column pressure-swing distillation with heat-pump technology

Energy-efficient extractive distillation combined with heat-integrated and intermediate reboilers for separating acetonitrile/isopropanol/water mixture

Novel methodology for determining the optimal vapor recompressed assisted distillation process based on economic and energy efficiency

Performance Enhancement of Heat Pump with Preheater-Assisted Pressure-Swing Distillation Process

Investigation about energy-saving for the isobutyl acetate synthesis in a reactive divided-wall column via vapor recompression heat pump