Separation purification process of dimethyl carbonate
A dimethyl carbonate and process technology, which is applied in the field of separation and purification of dimethyl carbonate, can solve the problems of energy recovery and utilization, separation, and methanol back-mixing in the process, so as to avoid methanol back-mixing and save energy significantly , The effect of simplifying the process
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Embodiment 1
[0040] Raw material composition ratio methanol: water: DMC: DMM: MF is 62.5: 12.5: 23.5: 0.9: 1.1, and the ratio of methanol and DMC after deducting water is 72.7: 27.3.
[0041] First, the raw material is added to the middle and lower part of the extractive distillation tower 1, and the temperature of the raw material is controlled at 60°C; the temperature of the inlet of the extractant into the extractive distillation tower 1 is controlled at 50°C. The absolute operating pressure of extractive distillation column 1 is 150kPa, the top reflux ratio is 11, the top operating temperature is 47°C, and the mass fraction of DMM and MF in the top gas phase stream is over 93%. The upper material stream produces the liquid phase stream of the side line, the production temperature is 89°C, the DMC mass fraction is 79%, the water mass fraction is 20.8%, and trace light components; the lower material stream produces the gas phase stream of the side line, and the production The temperature...
Embodiment 2
[0046] Raw material composition ratio methanol: water: DMC:DMM:MF is 58.4:14.3:25.2:1.1:1, the ratio of methanol and DMC after deducting water is 69.86:30.14.
[0047] First, the raw material is added to the middle and lower part of the extractive distillation tower 1, and the temperature of the raw material is controlled at 60° C.; the inlet temperature of the extractant into the extractive distillation tower 1 is controlled at 40° C. The absolute operating pressure of the extraction tower and the distillation tower is 150kpa, the reflux ratio at the top of the tower is 13, the operating temperature at the top of the tower is 46°C, and the mass fraction of DMM and MF in the gas phase stream at the top of the tower is over 95%. The upper material stream produces the liquid phase stream of the side line, the production temperature is 88°C, the DMC mass fraction is 79.9%, the water mass fraction is 20%, and trace light components; the lower material stream produces the gas phase ...
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