PURIFICATION METHOD FOR ELECTRONIC-GRADE ETHYLENE CARBONATE, AND PURIFICATION APPARATUS

摘要

Disclosed are a purification method for electronic-grade ethylene carbonate, and a purification apparatus thereof. The method comprises the following steps: S1: seeding ethylene carbonate having a purity of 99.90%-99.98%; S2: heating to 36-37℃ after the seeding ends, and then maintaining a constant temperature for 0.5-3 h; S3: carrying out cooling and crystallization after the temperature maintenance ends; S4: carrying out heating and sweating on crystals in a gradual heating manner, and carrying out a next round of crystallization on an obtained sweating liquid; S5: after the sweating ends, heating to melt the crystals subjected to sweating to obtain a first product having a purity of 99.995% or more; and S6: rectifying a non-crystallized mother liquor twice to obtain a second product having a purity of 99.990% or more.