System and process for producing halogen oxides
A system and process for oxidizing inorganic or organic species is disclosed. The system and process includes mixing a dilute aqueous alkali metal halite solution with a mixture of protic acids to produce an effluent containing a halous acid; and contacting the effluent containing the halous acid with a catalytic material to produce a halogen oxide.
1. A process for producing a halogen oxide, the process comprising:
mixing a dilute aqueous alkali metal halite solution with a mixture of protic acids to produce an effluent containing a halous acid, wherein the mixture of protic acids does not comprise a halide-containing acid, and wherein the mixture of protic acids comprises a sulfur-containing protic acid and a phosphorus-containing acid; and
contacting the effluent containing the halous acid with a catalytic material to produce the halogen oxide.
2. The process of claim 1 , wherein a concentration of halous acid produced after mixing is less than about 6.0 grams per liter.
3. The process of claim 1 , wherein the dilute alkali metal halite solution consists essentially of a dilute alkali metal chlorite solution.
4. The process of claim 3 , wherein the dilute alkali metal chlorite solution is a dilute sodium chlorite solution.
5. The process of claim 1 , wherein the phosphorus-containing protic acid is hypophosphorous acid, phosphoric acid, perphosphoric acid, phosphorous acid, pyrophosphoric acid, metaphosphoric acid, or a combination comprising at least one of the foregoing phosphorus-containing protic acids.
6. The process of claim 1 , wherein the sulfur-containing protic acid is sulfuric acid, sulfurous acid, hydrogen sulfide, persulfuric acid, hyposulfurous acid, or a combination comprising at least one of the foregoing sulfur-containing protic acids.
7. The process of claim 1 , wherein the mixture of protic acids consists of phosphoric acid and sulfuric acid.
8. The process of claim 1 , wherein the catalytic material comprises a catalytic metal oxide and a ceramic support.
9. A process for producing chlorine dioxide comprising:
mixing a dilute alkali metal chlorite solution with a mixture of protic acids to produce an effluent containing a chlorous acid, wherein the mixture of protic acids does not comprise a halide-containing acid, and wherein the mixture of protic acids comprises a sulfur-containing protic acid and a phosphorus-containing protic acid; and
contacting the effluent containing the chlorous acid with a catalytic material to produce the chlorine dioxide.
10. The process of claim 9 , wherein the phosphorus-containing protic acid is hypophosphorous acid, phosphoric acid, perphosphoric acid, phosphorous acid, pyrophosphoric acid, metaphosphoric acid, or a combination comprising at least one of the foregoing phosphorus-containing protic acids.
11. The process of claim 9 , wherein the sulfur-containing protic acid is sulfuric acid, sulfurous acid, hydrogen sulfide, persulfuric acid, hyposulfurous acid, or a combination comprising at least one of the foregoing sulfur-containing protic acids.
12. The process of claim 9 , wherein the mixture of protic acids consists of phosphoric acid and sulfuric acid.
13. The process of claim 9 , wherein the catalytic material comprises a catalytic metal oxide and a ceramic support.