Process of producing alkali hydroxide, chlorine and hydrogen...

Details Process of producing alkali hydroxide, chlorine and hydrogen... Process of producing alkali hydroxide, chlorine and hydrogen...

C - Chemistry, Metallurgy

25

B

204/64.3

C25B 15/08 (2006.01) C01D 3/16 (2006.01)

Patent

CA 1318880

ABSTRACT Alkali hydroxide, chlorine and hydrogen are produced from an aqueous alkali chloride solution by membrane electrolysis. A high-NaCl solid salt, which contains impuri- ties, 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 The resulting mixture is fed to a thickener, from which precipitates and clarified raw brine are separately withdrawn.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 di- vided 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.

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