Process for producing ethylene glycol

In a process for the preparation of ethylene glycol by the reaction of reactants consisting essentially of ethylene, molecular oxygen and water in the presence of an iodine catalyst at a temperature of 50.degree. to 250.degree. C. and under a pressure sufficient to maintain the liquid phase, the improvement which comprises the addition of a copper co-catalyst or promoter to the reaction system, the copper co-catalyst being present in the amount of 10 ppm to 5 wt. percent based upon the liquid reaction mixture and the iodine catalyst, expressed as HI, being present in the amount of 0.1 to 20 wt. percent of the liquid reaction mixture, the molar ratio of ethylene to oxygen varying from 100:1 to 1:100 and the ratio of ethylene to water varying from 10:1 to 1:100.