Patent ID: 6296745
Filing Date: 2001-10-02
Classification: C25B

Abstract:
A method of operating an electrolytic cell comprising:(a) providing an electrolytic cell having a catholyte compartment containing a cathode, an anolyte compartment containing an anode, and a liquid-permeable diaphragm separating said catholyte and anolyte compartments;(b) introducing alkali metal chloride brine into said anolyte compartment;(c) applying an electrical potential across said cathode and anode; and(d) withdrawing hydrogen gas and an aqueous solution comprising alkali metal hydroxide from said catholyte compartment, and chlorine gas from said anolyte compartment; wherein the improvement comprises adding water-insoluble inorganic particulate material and alkali metal polyphosphate to said anolyte compartment while said electrolytic cell is operating.