Chemistry: electrical and wave energy – Processes and products
Patent
1991-12-02
1992-08-04
Tung, T.
Chemistry: electrical and wave energy
Processes and products
2041824, C25B 100
Patent
active
051356228
ABSTRACT:
This invention embodies a process for synthesizing electrodialythically palladium ammine hydroxide for use in palladium plating baths. The electrodialysis takes place in a cell with a catholyte, a product and an anolyte compartments which are divided by a fluorinated anion permselective membranes. Catholyte solution readily supplies OH ions, raw starting solution contains palladium ammine ions and anions capable of migrating into the anolyte compartment, and anolyte solution readily absorbs the anions from the raw solution. Electrodes, placed in the outer compartments, are placed no more than 5 cm apart. The process is conducted with current densities of 500 ASF or less, with 200 ASF being preferable, with current efficiencies of 50 to 90 percent, with 60-80 percent being preferable, and at bath temperatures of from above freezing to 40.degree. C., with 25.degree.-40.degree. C. being preferable. The electrodialysis results in a stable palladium diammine hydroxide solution containing a small fraction of starting palladium diammine compound, such as palladium diammine chloride, making the final solution readily useable either as a replenishing or a plating solution.
REFERENCES:
patent: 3909381 (1975-09-01), Ehrsam et al.
patent: 4229280 (1980-10-01), Horn
patent: 4289597 (1981-09-01), Grenda
patent: 4324629 (1982-04-01), Oka et al.
patent: 4427502 (1984-01-01), Abys et al.
patent: 4468296 (1984-08-01), Abys et al.
patent: 4486274 (1984-12-01), Abys et al.
patent: 4493754 (1985-01-01), Abys et al.
patent: 4512963 (1988-04-01), Abys et al.
patent: 4911798 (1990-03-01), Abys et al.
patent: 4911799 (1990-03-01), Abys et al.
Abys Joseph A.
Kadija Igor V.
Maisano, Jr. Joseph J.
Alber Oleg E.
AT&T Bell Laboratories
Ryser David G.
Tung T.
LandOfFree
Electrochemical synthesis of palladium hydroxide compounds does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electrochemical synthesis of palladium hydroxide compounds, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electrochemical synthesis of palladium hydroxide compounds will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-776129