Comparison of Pressurized Atmospheric and Atmospheric Pressure Variable Pressure Distillation Processes for Separating Methanol Dimethyl Carbonate
This article explores the effects of two pressure swing distillation processes,pressure-atmospheric and atmospheric-pressure,on the separation of methanol dimethyl carbonate.Through Aspen Plus simulation calculations,it was found that under the premise of specifying the purity of methanol and dimethyl carbonate products,there is a significant difference in energy consumption between high-pressure and atmospheric-pressure towers with the same number of trays;the reboiler load of the pressure-atmospheric process is more than 20%higher than that of the atmospheric-pressure process.Therefore,the atmospheric-pressure process should be used to separate methanol dimethyl carbonate.When designing a pressure swing distillation system,if changing the order of the high-pressure and low-pressure towers can achieve the separation of azeotropes,it is necessary to conduct energy consumption or economic analysis on the two processes and select the more optimal one.
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