Abstract: The influence factors on energy saving optimization for solvent recovery system of ketone benzol dewaxing unit were explored by NRTL physical property method and Aspen Plus process simulation software. The effects of ketone/benzene ratio, water content, and key heat exchangers on energy consumption of the plant were analyzed to find the optimal steam energy utilization. The results showed that when the ketone/benzene mass ratio was controlled at 0.65 and the water content was controlled at 0.3%, the total steam consumption was reduced by 5.63%, and thus the proportion of steam output of the primary, secondary, and tertiary flash tower was 22.39: 26.98:50.63. On this basis, if the vaporization rates of hot discharge of two key heat exchangers were reduced to 0, the effective heat transfer area of the two exchanges would increase by 27.16% and 13.36%, respectively, and the total heat load would reduce by about 24.39%.

Key words: ketone benzol dewaxing, simulation optimization, solvent recovery, energy saving