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In view of the characteristics of the water-methyl acetate-tetrahydrofuran ternary azeotropic system, a heat integrated extractive distillation process was proposed to study its separation. The WILSON thermodynamic model was selected to calculate the vapor-liquid equilibrium data of the system, and the two-phase flash module in ASPEN PLUS software was used to simulate the relative volatility between the azeotropic components for the system under different extractant conditions. The results showed that ethylene glycol was more suitable as the extractant for the system, and the best solvent ratio was 0.37. On this basis, taking energy consumption and annual total cost (CAT) as technical and economic evaluation indicators, the conventional three-column extractive distillation process was simulated and the parameters were optimized, and the heat exchange network of the distillation system was optimized by using pinch point analysis technology. Based on the optimized results of the heat exchange network, the conventional three-column extractive distillation process was integrated with heat. The research results showed that compared with the conventional three-column extractive distillation process, the heat integrated extractive distillation process can reduce energy consumption by about 34.70%,save CAT about 21.98%,and increase thermodynamic efficiency by 36.34%.Therefore, the heat integrated extractive distillation process is a more suitable energy-saving process route for separating the ternary azeotrope system. [ABSTRACT FROM AUTHOR]

Presently in China several common problems exist in once-through seawater cooling system such as the great losses of heat energy and the problems of environmental pollution from the discharge of heated water and the chlorination biocide etc. Taking a case study of seawater cooling for an ammonia production process as an example the research used the pinch point design method to diagnose and optimize the energy utilization. Then the research used the simple and convenient spreadsheet modeling method to resolve pinch point in heat exchanger network. A minimum temperature difference is chosen to be 12 the location of the pinch point is between SN9 and SN10 the average pinch temperature of the heat exchanger network is 116 the minimal requirement of the hot utility and the minimal requirement of the cold utility are 19.91 MW and 22.66 MW the calculation results are close to the results from the large-scale simulation software therefore the feasibility of the method is verified. Meanwhile the research aims to provide the basis for further optimization of the cooling system. [ABSTRACT FROM AUTHOR]