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PROCESS TO REDUCE THE ETHYLENE GLYCOL ETHYLENE CARBONATE CONTENT PRODUCED BY ETHYLENE CARBONATE HYDROLYSIS
PROCESS TO REDUCE THE ETHYLENE GLYCOL ETHYLENE CARBONATE CONTENT PRODUCED BY ETHYLENE CARBONATE HYDROLYSIS
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机译:减少乙二醇水解产生的乙二醇含量的方法
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摘要
Ethylene glycol is purified, particularly for fiber-grade applications, by removal of the residual ethylene carbonate from which the glycol was derived. The effluent from a reactor in which ethylene carbonate is hydrolyzed to ethylene glycol is distilled to produce a lower-boiling fraction comprising substantially ethylene glycol and water and a higher-boiling fraction comprising substantially ethylene glycol, higher glycols, and concentrated in hydrolysis catalyst. The higher-boiling fraction is recirculated to reflux against the lower-boiling product, thereby essentially completing the hydrolysis of unreacted ethylene carbonate thereby reducing the ethylene carbonate content of the ethylene glycol to very low levels suitable for fiber-grade applications.
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