C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/147
C01B 11/02 (2006.01) C13B 20/12 (2011.01) B01D 21/01 (2006.01) B01D 21/02 (2006.01) B01D 21/24 (2006.01)
Patent
CA 1227619
Abstract A mixture of sulfuric acid and hydrochloric acid essentially free from dissolved sulfur dioxide to be used in a chlorine dioxide reactor is produced by reacting chlor- ine and sulfur dioxide in at least two reaction zones. In the bottom of a primary reaction zone the total amount of sulfur dioxide needed for the mixed acid production is introduced in an aqueous mixture of sulfuric and hydro- chloric acid containing dissolved chlorine and gaseous chlorine. The sulfur dioxide reacts with chlorine in the aqueous phase to produce sulfuric acid and hydrochloric acid. The mixed acid produced in the primary reaction zone contains dissolved quantities of sulfur dioxide and is forwarded to a secondary reaction zone. Chlorine is in- troduced into the lower part of the secondary reaction zone. The amount introduced can be the total amount of chlorine to be used in the production of the mixed acid for the chlorine dioxide reactor, or it can be a part of that amount, the balance being introduced in the primary reaction zone. The amount should be large enough for a gaseous chlorine phase to leave the secondary reaction zone. The produced mixed acid is withdrawn from the lower part, and preferably the bottom of the secondary reaction zone. At least a part of the mixed acid is introduced into a chlorine dioxide reactor.
482827
Axegdrd Peter A.c.
Holmstrom Ulla-Kari M.
Norell Maria G.
Sandgren Lage M.
Kemanord Ab
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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