METHOD FOR PURIFICATION OF ETHYLENE GLYCOL

摘要

METHOD FOR PURIFICATION OF ETHYLENE GLYCOL The invention discloses a method for purifying ethylene glycol by using an ion exchange resin. The anion exchange resin adsorbs aldehyde impurities from the ethylene glycol. A basic anion exchange resin is prepared in a bisulfite or a hydroxyl form. The ethylene glycol passed through the column under air or nitrogen gas atmospheric conditions. As a result, aldehydes are absorbed as their bisulfite adducts. Subsequently, the ethylene glycol may be treated by carbon adsorption to improve the UV/visible absorbance. A weakly basic resin such as Amberlte? IR-45 is preferred, but other anion exchange resins are also expected to be effective.