Energy Consumption Optimization Of Carbon Five Mixture Separation Using Dimethylformamide

In this paper, chemical process simulation software Aspen plus and Aspen Energy Analyzer are used to analyze and optimize energy saving standard of C5 separation using dimethylformamide (DMF) from two aspects:the unit equipment improvement and the design of heat exchanger networks. Taking the carbon five process pre-removal of light component tower as the object, the heat-integrated distillation column (HIDiC) is studied, the simulation results show that HIDiC can meet the requirements of pre-removal of light component tower. The effect of compression ratio and heat duty distribution model on the energy consumption is studied, and the tower structure is optimized. The optimized internal heat-integrated distillation column provides energy-saving effect of 86.7%,7.4% of total annual cost (TAC) is reduced compared with conventional distillation column (CDiC).Pinch analysis method is used to design the heat exchanger network of C5 separation system, considering the feasibility of practical heat transfer network, the process is divided into two parts:the 100 and 200 units,300 and 400 units. According to the three basic principle of pinch analysis, the maximum heat recovery heat exchanger network is designed, Set TAC as the objective function to optimize the heat exchanger network.The final design of the 100 and 200 units reduced TAC by 6.36%, saving 11.36% of hot utilities,13.71% of cold utility; design of the 300 and 400 units reduced TAC by 14.57%, saving 29.31% of hot utilities and 31.52% of cold utility.