RECOVERY METHOD FOR GLYCOL AND REGENERATION METHOD FOR USED SOLVENT

PROBLEM TO BE SOLVED: To provide a recovery method for glycols, capable of simply and efficiently fractionating and recovering glycols of high quality from a used solvent, and a regeneration method for the used solvent. SOLUTION: The recovery method for glycols comprises a process for distilling the used solvent containing glycols, water and oils to obtain a fraction containing glycols, a process performing the contact treatment of the fraction containing glycols with an adsorbent and a process for re-distilling the treated liquid obtained by the contact treatment to recover glycols. The regeneration treatment method of the used solvent has a process for distilling the used solvent into a glycols fraction, a water fraction and the residue, a process for re- distilling the treated liquid, which is obtained after the contact with the glycol fraction with the first adsorbent, to recover glycols and a process for performing the waste treatment of the water fraction after the contact with a second adsorbent.