Process for producing sodium chloride brines suitable for electrolysis
AssigneeBayer Aktiengesellschaft
InventorRolf Schafer
Life of this patent
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Abstract
Contacting rock salt containing at least one member of the group consisting of anhydrite and calcium sulfate as an impurity with an aqueous sodium chloride solution initially containing from about 200 to about 300 g/l of sodium chloride and having a calcium ion concentration of 0.01 to 0.5 g/l and a sulfate ion concentration of 0.1 to 15 g/l, the multiplication product of said calcium ion concentration and said sulfate ion concentration having a maximum value of 2, and discontinuing said contact after the sodium chloride brine has formed.
Claims5
In the process for producing sodium chloride brine having a calcium sulfate concentration suitable for use in the electrolysis of sodium chloride wherein rock salt containing calcium sulfate as an impurity is contacted with an aqueous sodium chloride solution the improvement which comprises contacting said rock salt with an aqueous sodium chloride solution initially containing from about 200 to about 300 g/l of sodium chloride and having a calcium ion concentration of 0.01 to 0.5 g/l and a sulfate ion concentration of 2 to 15 g/l for a contact time of at least thirty minutes and until sodium chloride brine having a calcium sulfate concentration suitable for use in said electrolysis is formed, the multiplication product of said calcium ion concentration and said sulfate ion concentration having a maximum value of 2, discontinuing said contact and removing undissolved calcium sulfate.
Dependencies are inferred from the claim text.