Method for reducing uv absorption in ethylene glycols,...

Details Method for reducing uv absorption in ethylene glycols,... Method for reducing uv absorption in ethylene glycols,...

B - Operations, Transporting

01

D

B01D 15/04 (2006.01) B01J 41/14 (2006.01) C07C 29/94 (2006.01) C07C 45/79 (2006.01)

Patent

CA 2203485

Disclosed is a method of reducing the UV absorption of a solvent that comprises water, an ethylene glycol, or a mixture thereof, where the solvent contains at least 0.01 ppm of a dione, particularly 3-methyl-2-hydroxy cyclopent-2-eneone or its tautomer, 3-methyl-1, 2-cyclopentanedione. The solvent is passed through an anionic exchange resin containing strong base sites. The UV absorbance of the effluent from the anionic exchange resin can be monitored and, when it increases, the resin can be reactivated by passing an aqueous solution of a base through it.

Méthode pour réduire l'absorption d'UV par un solvant renfermant de l'eau, de l'éthylèneglycol ou un mélange de ces derniers; le solvant renferme au moins 0,01 ppm d'une dione, notamment une 3-méthyl-2-hydroxycyclopent-2-énone ou son tautomère, la 3-méthyl-1, 2-cyclopentanedione. On fait passer le solvant dans une résine échangeuse d'anions, renfermant des sites de bases fortes. L'absorbance d'UV de l'effluent à partir de la résine échangeuse d'anions peut être mesurée; lorsqu'elle augmente, on peut réactiver la résine en y faisant passer une solution aqueuse d'une base.

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