WERKWIJZE VOOR HET ZUIVEREN VAN VERESTERD GLYCOL BEVATTEND ETHYLEENGLYCOL OF PROPYLEENGLYCOL DOOR AZEOTROPE DESTILLATIE.

摘要

Ethylene glycol or 1,2-propylene glycol contained in mixtures with lower carboxylate esters of the glycol is recovered by azeotropic distillation of the mixtures with an azeotroping agent forming a minimum boiling azeotrope with the ethylene glycol or the 1,2-propylene glycol, the distillation being effected with reflux of azeotroping agent as well as controlled reflux of the glycol to the distillation zone.