C - Chemistry – Metallurgy – 25 – B
Patent
C - Chemistry, Metallurgy
25
B
C25B 1/26 (2006.01) C01D 5/00 (2006.01) C25B 1/34 (2006.01) C25B 15/08 (2006.01)
Patent
CA 2129280
Abstract Disclosed is a process for the electrolysis of an aqueous potassium chloride solution, in which the sulphate ions are removed from the solution by precipitation as potassium sulphate and/or as potassium sulphate-containing salt mixture and/or as potassium sulphate-containing compound. The precipitation is achieved by increasing the hydroxide ion and/or carbonate ion concentration in the potassium chloride brine, for example by addition of potassium hydroxide and/or potassium carbonate. The sulphate ions are preferably precipitated from the depleted brine at temperatures higher than the saturation temperature of potassium chloride. The method according to the invention is applicable to the amalgam, diaphragm or membrane process of electrolysis of potassium chloride. The method avoids the use of expensive and toxic precipitants in particular barium salts, reduces the amount of filter sludge and provides potassium sulphate which can be used, for example, in the fertilizer industry.
Honigschmid-Grossich Rudiger
Schmittinger Peter
Stahl Ingo
Wambach-Sommerhoff Karl R.
Fetherstonhaugh & Co.
Huls Aktiengesellschaft
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