Dehydration of a mixture containing a diol with high water content using optimized pervaporation process

A method of dehydrating a mixture of organic liquid and water, the method comprising:

• feeding the mixture to a membrane, wherein the mixture comprises a minimum of 85 wt. % water and a maximum of 15 wt. % organic liquid;
• soaking the membrane with a soaking liquid comprising 25 to 30 wt. % of an organic liquid and 70 to 75 wt. % water;
• subjecting the mixture in the membrane to process conditions sufficient to cause pervaporation, wherein the process conditions comprise a temperature in a range of 85 to 160° C.;
• and
• recovering a permeate comprising a higher wt. % of water than the wt. % of water in the mixture and a retentate comprising a higher wt. % of organic liquid than the wt. % of the organic liquid in the mixture.