Simulation and economic evaluation of separating dimethyl carbonate-methanol by extractive distillation with propylene carbonate as solvent
Aiming at the separation of DMC-MeOH azeotrope at the top of the tower for dimethyl carbonate(DMC)production by reactive distillation with propylene carbonate(PC)and methanol(MeOH)as raw materials,a extractive distillation process with PC as solvent was presented.The simulation and economic evaluation were carried out on the Aspen Plus software platform.The feasibility and selectivity of the solvent were investigated,the process flow scheme was determined,and the process parameters of the extractive distillation process were optimized.The energy consumption and economy of PC extractive distillation and heat integrated pressure swing distillation for separating DMC-MeOH azeotrope were compared.The results show that the total energy consumption and total annual cost(TAC)of the extractive distillation process are reduced by 53.9%and 49.5%,respectively,compared with the pressure swing distillation process,showing the feasibility and technical and economic advantages of the extractive distillation process.
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