Purification of ethylene glycol derived from ethylene carbonate

Details Purification of ethylene glycol derived from ethylene carbonate Purification of ethylene glycol derived from ethylene carbonate

C - Chemistry, Metallurgy

07

C

22/53, 260/641.4

C07C 29/80 (2006.01) B01D 3/00 (2006.01) C07C 29/88 (2006.01) C07C 31/20 (2006.01)

Patent

CA 1241347

PURIFICATION OF ETHYLENE GLYCOL DERIVED FROM ETHYLENE CARBONATE INVENTOR MITCHELL BECKER HOWARD M. SACHS ABSTRACT 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 ethylene glycol and water and a higher-boiling fraction comprising ethylene glycol, higher glycols, and concentrated in hydrolysis catalyst. The higher-boiling fraction is recirculated to reflux against the lower-boiling product, thereby reducing the ethylene carbonate content of the ethylene glycol to very low levels suitable for fiber-grade applications.

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