Hypochlorite production

Claim 2

IN A PROCESS FOR THE PRODUCTION OF HYPOCHLORITEBY THE ELECTROLYSIS OF AN AQUEOUS ALKALI METAL CHLORIDE SOLUTION, THE IMPROVEMENT THAT COMPRISES PASSINGAN ELECTROLYZING CURRENT THROUGH SAID SOLUTION BETWEEN A CATHODE AND AN OPPOSED ANODE, WHICH ANODE COMPRISES A CONDUCTIVE BASE BEARING ON AT LEAST APORTION OF THE SURFACE THEREOF A COATING CONSISTING ESSENTIALLY OF FROM 30 TO 90 PERCENT BY WEIGHT STANNIC OXIDE, FROM 1.0 TO 10 PERCENT ANTIMONY OXILE, CALCULATED AS SB2O3, FROM 1.0 TO 50 PERCENT OF AT LEAST ONE PLATINUM GROUP METAL OXIDE AND FROM 0.5 TO 30 PERCENT OF A VALVE METAL OXIDE SELECTED FROM TE GROUP CONSISTING OF TITANIUM AND TATALUM OXIDES, WITH THE PROVISO THAT THE MOLE RATIO OF SNO2:SB2O3 IS BETWEEN 95:5 AND 85:15.

Claim 3

A process for the production of a solution containing from 0.5 to 10 grams per liter of hypochlorite, which process comprises passing an electrolyzing current through an aqueous solution of alkali metal chloride, at a pH of greater than 7 and a temperature between 5* and 50* C, between a cathode and an opposed anode, which anode comprises an electrically conductive supporting substrate bearing on at least a portion of the surface thereof a coating consisting essentially of from 30 to 90 percent stannic oxide, from 1.0 to 10 percent antimony oxide, calculated as Sb2O3, from 1.0 to 50 percent of at least one platinum group metal oxide and from 0.5 to 30 percent of a valve metal oxide selected from the group consisting of titanium and tantalum oxides, with the proviso that the mole ratio of SnO2:Sb2O3 is between 95:5 and 85:15.

Claim 4

A process for the production of a solution containing from 0.5 to 10 grams per liter of hypochlorite, which process comprises passing an electrolyzing current through an aqueous solution of alkali metal chloride, at a pH of greater than 7 and a temperature between 5* and 50* C, between a cathode and an opposed anode, which anode comprises an electrically conductive supporting substrate bearing on at least a portion of the surface thereof a coating consisting essentially of from 30 to 90 percent stannic oxide, from 1.0 to 10 percent antimony oxide, calculated as Sb2O3, from 1.0 to 50 percent of at least one platinum group metal oxide and from 0.5 to 30 percent of a valve metal oxide selected from the group consisting of titanium and tantalum oxides, with the proviso that the mole ratio of SnO2:Sb2O3 is between 95:5 and 85:15.

Claim 5

A process as in claim 2 wherein the electrolyzing current is within the range of 0.5 to 1.0 ampere per square inch.

Claim 6

A process as in claim 2 wherein the alkali metal chloride concentratiOn is between 28 and 35 grams per liter.