Method and apparatus for treating an aqueous electroplating bath solution
US6884332B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 12, 2002 |
| Grant date | Apr 26, 2005 |
| Priority date | — |
| Expiry date | May 17, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D21/18
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method and apparatus for treating an aqueous electroplating bath solution. The method comprises continuously agitating the solution; adjusting the pH of the solution, adjusting the temperature of the solution while adding an amount of hydrogen peroxide sufficient to promote dissolution of the hydrogen peroxide and generation of hydroxyl radicals; and adding an amount of an iron-containing compound so as to increase the rate of dissolution of the hydrogen peroxide to hydroxyl radicals so as to oxidize the organic compounds; whereby the total amount of organic carbon compounds in the solution is reduced. The apparatus comprises a treatment vessel, a pump for transferring a portion of the solution from the vessel to a mixing tank and for transferring a second portion of the solution to a heat exchanger for heating or cooling the second portion of the solution and a pump for transferring hydrogen peroxide to the vessel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.