In the commercial process, ethylene oxide is reacted with an approximately
tenfold molar excess of water, either in the liquid
phase in the presence of an acidic catalyst (e. g., 0.5 - 1 .O wtYo
H,SO,) at normal pressure and 5O-7O0C, or without a catalyst
at 140-230 "C and 20-40 bar. The ethylene glycol manufacture
takes place almost exclusively in a coupled reactor following
direct oxidation of ethylene. The resulting aqueous crude glycol
solution is concentrated to 70% by evaporation and fractionally
distilled in several vacuum columns. Despite the large excess of
water, monoethylene glycol selectivity is only about 90%.
In the commercial process, ethylene oxide is reacted with an approximatelytenfold molar excess of water, either in the liquidphase in the presence of an acidic catalyst (e. g., 0.5 - 1 .O wtYoH,SO,) at normal pressure and 5O-7O0C, or without a catalystat 140-230 "C and 20-40 bar. The ethylene glycol manufacturetakes place almost exclusively in a coupled reactor followingdirect oxidation of ethylene. The resulting aqueous crude glycolsolution is concentrated to 70% by evaporation and fractionallydistilled in several vacuum columns. Despite the large excess ofwater, monoethylene glycol selectivity is only about 90%.
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