Reclamation of spent glycol by treatment with alkali metal hydro

Details Reclamation of spent glycol by treatment with alkali metal hydro Reclamation of spent glycol by treatment with alkali metal hydro

1976-04-14

1980-09-30

Yudkoff, Norman

Distillation: processes, separatory

With chemical reaction

Including step of adding catalyst or reacting material

568868, 203 18, 203 71, B01D 300, C07C 2924

Patent

active

042253942

ABSTRACT:
Ethylene glycol is recovered from spent glycol containing impurities, such as dimethyl terephthalate, by subjecting the spent glycol to a sequential flash evaporation-distillation or distillation-flash evaporation-distillation procedure. Dimethyl terephthalate impurities are rendered non-volatile by the addition of a small amount of alkali metal hydroxide prior to flash evaporation. Dewatering of spent glycol and separation of ethylene glycol from impurities rendered non-volatile by alkali metal hydroxide is also performed in one or two distillation steps. Sufficient ethylene glycol is recovered to make use of flash evaporation an optional step.

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