Removal of acid from cathodic electrocoating baths by electrodia

Details Removal of acid from cathodic electrocoating baths by electrodia Removal of acid from cathodic electrocoating baths by electrodia

1989-07-11

1990-11-20

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

2041808, 204301, 204299EC, B01D 1302

Patent

active

049716727

ABSTRACT:
Acid is removed from cathodic electrocoating baths by a process in which electroconductive sub-strates are coated with cationic resins present in the form of aqueous dispersions, at least a portion of the coating bath being subjected to an ultrafiltration where the ultrafiltration membrane retains the cationic resin to form an ultrafiltrate which contains water, solvent, low molecular weight substances and ions and at least a portion of the ultrafiltrate is recycled into the coating bath, and at least a portion of the ultrafiltrate is subjected to a special electrodialysis treatment before being returned into the electrocoating bath.

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