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本发明涉及一种乙二醇和二乙二醇的分离方法,将粗乙二醇溶液送至乙二醇精制塔,侧线采出乙二醇产品送至乙二醇精制槽精制,部分乙二醇和二乙二醇从塔釜采出,保证塔釜温度低于二乙二醇热分解温度;乙二醇精制塔釜液送至乙二醇循环塔,塔顶采出返回乙二醇精制塔,釜液为二乙二醇和重组分混合液;乙二醇循环塔釜液送至二乙二醇塔,塔顶采出二乙二醇产品,釜液为丙三醇等重组分混合液。
The invention relates to a method for separating ethylene glycol and diethylene glycol. The crude ethylene glycol solution is sent to an ethylene glycol refining tower, the ethylene glycol product is taken on the lateral line and sent to an ethylene glycol refining tank for refining, and part of ethylene glycol and Diethylene glycol from the tower kettle to ensure that the bottom of the pot temperature is lower than the thermal decomposition temperature of ethylene glycol; ethylene glycol purification tower bottoms sent to the ethylene glycol recycle column, The kettle liquid is a mixture of diethylene glycol and heavy components; the glycol circulation tower bottoms liquid is sent to a diethylene glycol tower, the diethylene glycol product is taken overhead, and the kettle liquid is a mixture of heavy components such as glycerin.