Chemistry: electrical and wave energy – Processes and products
Patent
1987-11-03
1989-06-13
Niebling, John F.
Chemistry: electrical and wave energy
Processes and products
204128, 204129, C25B 102, C25B 116, C25B 126
Patent
active
048390038
ABSTRACT:
Alkali hydroxide, chlorine and hydrogen are produced from an aqueous alkali chloride solution by membrane electrolysis. A high-NaCl solid salt, which contains impurities, is dissolved in water in a salt dissolver. Precipitating chemicals are added to the salt solution to precipitate the impurities. The resulting mixture is fed to a thickener, from which precipitates and clarified raw brine are separately withdrawn. The clarified raw brine from the thickener is divided at a ratio between 2:1 and 20:1 into first and second partial streams. The larger first partial stream is mixed with the salt solution and the precipitating chemicals before entering the thickener and the resulting mixture is fed to the thickener. The second partial stream of the clarified raw brine is fed through a fine purifier to the electrolytic cell. Spent brine from the electrolytic cell is fed to the salt dissolver.
REFERENCES:
patent: 4069117 (1978-01-01), Cooper
patent: 4481088 (1984-11-01), Moore et al.
patent: 4586993 (1986-05-01), O'Brien
Official Gazette, May 22, 1979, p. 1407.
Dworak Rainer
Lohrberg Karl
Gorgos Kathryn
Metallgesellschaft Aktiengesellschaft
Niebling John F.
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