Patent ID: 7972493

Claim:
A method of brine electrolysis, the method comprising the steps of: a. providing a brine feed; b. treating said brine feed by mixing said brine feed with reactants to precipitate solids to form a treated brine solution; c. filtering said treated brine solution with a filter material to form a brine filtrate; d. purifying said brine filtrate by removing cations from said brine filtrate through an ion exchange process to form a purified brine; e. providing an electrolytic cell having a cathode disposed in a cathode compartment and an anode disposed in an anode compartment, said cathode compartment and said anode compartment being separated by a membrane; f. feeding said purified brine into said anode compartment whereby chlorine is liberated from said purified brine at the anode and sodium ion and water migrate through said membrane to said cathode compartment, whereby depleted brine is formed in said anode compartment; g. removing said depleted brine from said anode compartment; h. adding an acid to said depleted brine removed from said anode compartment; i. separating, after said adding an acid step, said depleted brine into a feed solution and a cleaning solution, wherein said feed solution is subjected to vacuum dechlorination and chemical dechlorination; j. adding NaCl to said feed solution and adjusting the concentration of NaCl by adding water to form said brine feed of step a; and k. contacting said filter material with said cleaning solution whereby at least some material is oxidized and removed from said filter material.