Method for producing glycol by catalytic hydration

The invention relates to a method for producing glycol by catalytic hydration, which solves the problems of high equipment investment and high energy consumption existed in the direct hydration production of glycol in prior art. The method comprises the following steps: a) a material flow 1 containing ethylene oxide and water is introduced in a catalytic hydration reaction unit R, a material flow 6 containing glycol can be obtained after the reaction; b) the material flow 6 is introduced in a feed preheater of an evaporation tower D3, and preheating is carried out to obtain a material flow 7; c) the material flow 7 is introduced in the center part of the evaporation tower, after being separated, a glycol aqueous solution 8 is obtained at the bottom of the evaporation tower, and a steam material flow 9 is obtained at the top of the tower; and d) the material flow 9 is divided into a material flow 10 and a material flow 11; the material flow 10 is introduced in the feed preheater of the evaporation tower D3; an