Electrolysis: processes – compositions used therein – and methods – Electrolytic synthesis – Treating electrode – diaphram – or membrane during synthesis
Patent
1992-02-25
1996-10-22
Gorgos, Kathryn
Electrolysis: processes, compositions used therein, and methods
Electrolytic synthesis
Treating electrode, diaphram, or membrane during synthesis
205516, C25B 1500, C25B 134
Patent
active
055672981
ABSTRACT:
Disclosed is an improved method of making chlorine and alkali metal hydroxide, e.g., sodium hydroxide, in an electrolytic cell of the type wherein a liquid permeable diaphragm separates the anolyte from the catholyte, said method comprising adding to the anolyte, while the cell is operating, a hydrated aluminum silicate containing clay mineral, followed by lowering the pH of the anolyte by the addition of an inorganic acid and maintaining the anolyte at said lowered pH for a time sufficient to restore the cell to a predetermined current efficiency.
REFERENCES:
patent: 3755103 (1973-08-01), Grotheer et al.
patent: 4036729 (1977-07-01), Patil et al.
patent: 4169774 (1979-10-01), Kadija et al.
DuBois Donald W.
Maloney Bernard A.
Pickens Stanley R.
Gorgos Kathryn
PPG Industries Inc.
Stein Irwin M.
Whitfield Edward J.
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