Process for production of chlorine dioxide

Details Process for production of chlorine dioxide Process for production of chlorine dioxide

1985-04-23

1987-07-07

Doll, John

Chemistry of inorganic compounds

Halogen or compound thereof

Chlorine dioxide

423486, 423529, 423531, C01B 701, C01B 1102, C01B 1774

Patent

active

046786546

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 chlorine 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 hydrochloric 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 introduced 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 The produced mixed acid is withdrawn from the lower part, and preferably the bottom of the secondary reaction zone.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.

REFERENCES:
patent: 3714040 (1973-01-01), Jordan et al.
patent: 3864456 (1975-02-01), Winfield et al.
patent: 4086329 (1978-04-01), Cowley et al.
patent: 4393035 (1983-07-01), Fredette
patent: 4393036 (1983-07-01), Fredette
patent: 4508593 (1985-04-01), Bergstrom

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