Method of purifying ethylene carbonate, process for producing purified ethylene carbonate and ethylene carbonate
A technology of ethylene carbonate and purification method, applied in the field of purification of ethylene carbonate
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Embodiment 1
[0058] As a crystallization device, use the figure 1 Same device. The inner diameter of the tower (1) is 200mm, and the effective height is 2000mm (the height from the top of the dissolving part of the lower part of the tower to the height of the tower top), and thermocouple thermometers are arranged at intervals of 25 cm in the height direction inside. Warm water (52.3° C. at the inlet of the heating coil, 49.5° C. at the outlet of the heating coil, and a flow rate of 200 L / hour) was passed into the heater (2) (heating coil) as a heat medium. The heat supplied by the heating coil is: (flow rate) x (specific heat of water) x (coil inlet temperature - coil outlet temperature) = 200L hr -1 ×1.00kcal·L -1 ·℃ -1 ×(52.3-49.5)℃=560kcal·hr -1. The stirring device (7) uses a stirring shaft with horizontal stirring bars as stirring wings. The tower (1) is covered with an insulating material, but a slit-shaped window is provided in the vertical direction so that the state of cryst...
Embodiment 2
[0071] EC was purified in the same manner as in Example 1 except for the conditions shown in Table 1. As a result, MEG in EC was 7 wtppm, and the compounds shown in Table 2 were below the detection limit (5 wtppm). The detailed data are shown in the table below. In addition, in the research conducted by the inventors of the present invention, when the monoethylene glycol in EC is several tens of ppm, diethylene glycol and triethylene glycol in EC are not detected, and it is considered to be The detection limit (5 wtppm) or less.
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