Research on methanol distillation technology based on mechanical vapor recompression
A methanol distillation system scheme is proposed based on mechanical vapor recompression( MVR) technology.Latent heat of the condenser can be used as heat source of the re-boiler in methanol distillation column; no steam and cooling water are consumed in the proposed MVR methanol distillation system scheme. The simulation results show that for a methanol production system with annual 60 000 t output,compared with the conventional methanol distillation system process,MVR distillation process shows prominent technical,economic and environmental performance potential. Annual energy cost of MVR methanol distillation process is reduced 9. 86×106yuan RMB; energy consumption of the MVR methanol distillation system is117. 8 kWh /t,which is reduced about67. 7%; the cost of production is 76. 58 yuan /t,which is reduced about 68. 2%. The energy cost of MVR methanol distillation process is reduced about 6 002 t of standard coal equivalent,and the annual carbon dioxide emission is reduced about 15 725 t.