Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1989-08-29
1992-06-02
Niebling, John
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204151, 204153, 204301, B01D 6144, C02F 1469, C25B 700
Patent
active
051183994
ABSTRACT:
A multivalent metal hydroxide is separated as a solid from an alkali hydroxide or from another multivalent metal hydroxide in an electrodialytic cell. The separation process is regulated by varying the pH or concentration of alkali hydroxide in a feed compartment electrolyte by matching the rate alkali cations are fed and removed from the electrolyte. As a result, one multivalent metal cation separates as a solid in the feed electrolyte or one multivalent cation separates as a solid and one multivalent cation is ionically mobile and electrotransportable from the electrolyte. This electrodialytic method can be used to continuously regenerate sodium hydroxide etchants containing dissolved aluminum, when the dissolved aluminum is removed from the etchant as a solid and the sodium hydroxide is returned as a solution for etching.
REFERENCES:
patent: 4111772 (1978-09-01), Horn
patent: 4203822 (1980-05-01), Schenker et al.
patent: 4519881 (1985-05-01), Chang
patent: 4636288 (1987-01-01), Vaughan
Niebling John
Starsiak Jr. John S.
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