Production of polysulphide by electrolysis of white liquor containing sulphide
AssigneeEka Nobel AB
InventorsJohan Landfors, Bo H.ang.kansson, Maria Norell
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Abstract
Sulphide-containing white liquor is treated in a continuously operating electrolytic cell having separate anode and cathode compartments separated by a partially permeable barrier. White liquor is introduced into the anode compartment of the cell, and an aqueous solution of alkali metal hydroxide is introduced into the cathode compartment of the cell so that sulphide is oxidized in the anode compartment, while at the same time alkali metal cations are transported through the barrier into the cathode compartment, where water reacts to form hydroxide ions. An electrolytic cell suited for implementing the method is also disclosed.
Claims13
A method for treating sulphide-containing white liquor, wherein the white liquor is treated in a continuously operating electrolytic cell having separate anode and cathode compartments separated by a partially permeable barrier, by introducing white liquor into the anode compartment of the cell and an aqueous solution of alkali metal hydroxide into the cathode compartment of the cell, oxidizing sulphide in the anode compartment, while at the same time alkali metal cations are transported through the barrier into the cathode compartment in which water reacts to form hydroxide ions, wherein the temperature in the anode compartment is maintained in a range of from about 60.degree. C. to the boiling point of the white liquor.
Dependencies are inferred from the claim text.