As a kind of green solvent and chemical intermediate, dimethyl carbonate (DMC) is an important derivation of the downstream production chains of coal chemical industry, methanol (MeOH) chemical industry and CO2 chemical industry. However, the disadvantages of high energy consumption and complicated operation in the current MeOH-DMC azeotrope separation process have greatly restricted the industrial economic benefits. Concentrating on the problems of MeOH?DMC azeotropic system separation in transesterification, the process simulation and energy integration of three azeotrope separation methods had been completed, including pressure-swing distillation method, ethylene carbonate (EC) extractive distillation method and ethylene glycol (EG) extractive distillation method. And the energy consumption of three methods was compared under the same separation target, which was in the following order: EG extractive distillation method>EC extractive distillation method>pressure-swing distillation method. The operation parameters of three kinds of azeotrope separation process were determined by using sensitivity analysis method. And exergy analysis method was adopted to investigate the exergy loss in the pressure-swing azeotrope separating process which had the lowest energy consumption. The results showed that the internal circulation exergy was 1.55 times of the input total exergy in the DMC production process, and the exergy loss was about 7.9%.
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