Regenerating chelating type ion exchange resins

Details Regenerating chelating type ion exchange resins Regenerating chelating type ion exchange resins

B - Operations, Transporting

01

J

117/183, 362/41

B01J 45/00 (2006.01) B01J 49/00 (2006.01) B05D 7/14 (2006.01) B05D 7/16 (2006.01) C09D 5/08 (2006.01)

Patent

CA 2117642

The use of chelating type cation exchange resins, particularly those with iminodiacetic acid functionality, to remove dissolved multivalent cations such as iron, zinc, and chromium from used autodeposition compositions permits reuse of the autodeposition compositions without the need for added surfactant and without developing any undesirable graininess or other texture in the coatings formed. The cation exchange resins can be efficiently regenerated with 0.5 to 4 % by weight aqueous hydrofluoric acid.

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