Electrolytic process for the generation of stable solutions of chlorine dioxide
OwnerJoseph Matthew Kelleyinventor
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Abstract
Chlorine dioxide dissolved in water is produced by passing a solution of stabilized chlorine dioxide or sodium chlorite solution, with or without added sodium chloride, through an electrolytic cell having an anode and cathode, in the absence of a semi-permeable membrane but in the presence of a buffer, an anolyte with a pH below 10 is produced so that disproportination of the ClO2 is not appreciable.
Claims16
An electrolytic process for generating a stable solution of chlorine dioxide, which process comprises the steps of:
- a) preparing an aqueous solution containing chlorite ions in a concentration of about 10 to about 80,000 ppm;
- b) adding a buffering agent and/or an acid to the aqueous chlorite solution in an amount sufficient to control the pH of the chlorine dioxide solution at a pH of about 9.5 or below after electrolysis;
- c) passing the buffered and/or acidified aqueous chlorite solution through an electrolytic cell containing an anode and a cathode, but no membrane, to electrolyze the chlorite to chlorine dioxide and generate the stable solution of chlorine dioxide;
- and
- d) optionally diluting the stable solution of chlorine dioxide to a concentration effective for disinfecting, sanitizing, or deodorizing.
An electrolytic process for generating a stable solution of chlorine dioxide, which process comprises the steps of:
- a preparing an aqueous solution containing chlorite ions in a concentration of about 10 to about 80,000 ppm;
- b) passing the chlorite solution through an electrolytic cell containing an anode and a cathode, but no membrane, to electrolyze the chlorite and generate a solution of chlorine dioxide as the electrolyte effluent;
- c) adjusting the pH of the effluent to a pH below about 9.5 to stabilize the solution of chlorine dioxide;
- and
- d) optionally diluting the stable solution of chlorine dioxide to a concentration effective for disinfecting, sanitizing, or deodorizing.
An electrolytic process for generating a stable solution of chlorine dioxide, which process comprises the steps of:
- a) preparing an aqueous solution containing a chlorite, a chlorate, and a buffering agent and/or acid capable of maintaining the pH below about 7.0;
- b) passing the buffered and/or acidified aqueous solution through an electrolytic cell which comprises an anode and a cathode, but no membrane, to produce an aqueous solution of chlorine dioxide;
- and
- c) optionally diluting the aqueous solution of chlorine dioxide to a concentration effective for disinfecting, sanitizing, or deodorizing.
An electrolytic process for generating hypobromous acid, which process comprises the steps of:
- a) preparing an aqueous solution containing sodium cations and chloride and bromide anions;
- b) adding a buffer and/or an acid to the aqueous solution in an amount sufficient to maintain the pH of the solution between about 5 and about 8 after electrolysis;
- c) passing the buffered and/or acidified solution through an electrolytic cell containing an anode and a cathode, but no membrane, to electrolyze the sodium bromide to an aqueous solution of hypobromous acid;
- and
- d) optionally diluting the aqueous solution of hypobromous acid to a concentration effective for disinfecting, sanitizing, or deodorizing.
Dependencies are inferred from the claim text.