C - Chemistry – Metallurgy – 25 – B
Patent
C - Chemistry, Metallurgy
25
B
204/64.3
C25B 1/34 (2006.01) C25B 15/08 (2006.01)
Patent
CA 1292438
ABSTRACT There is disclosed a method of electrolyzing an alkali metal chloride in brine in a membrane cell having at least an anolyte compartment and a catholyte compartment, which method comprises feeding the brine solution to the anolyte compartment, imposing a voltage across the cell thereby evolving chloride at the anode and an alkali metal hydroxide at the cathode, removing the salt-depleted brine solution from the anolyte compartment, separating the chlorine from the salt-depleted brine solution, resaturating the brine solution by contact with impure alkali metal chloride, treating the resaturated brine solution to remove impurities including alkaline earths and heavy metals, and recycling the brine solution as feed to the anolyte compartment, the improvement which comprises adding a controlled amount of a source of calcium ion to the salt-depleted brine solution, after the solution exits the anolyte compartment and prior to resaturation, followed by precipitation of calcium carbonate (CaCO3) from the brine solution by introducing an alkali metal carbonate after resaturation of the salt-depleted brine solution, whereby the sulfate concentration entering the membrane cell is controlled. As disclosed, this method is useful in controlling sulfate concentration by preventing dissolution of sulfate impurities found in the salt.
510010
Mcfadden Fincham
Washington Group International Inc.
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