MANUFACTURE OF CHLORINE DIOXIDE

Japanese Patent JPS61205602

A

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 The produced mixed acid is withdrawn from the lower part, and preferably the bottom of the secondary reaction zone.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

HOLMSTROM ULLA-KARI MARGARETA
SANDGREN LAGE MARTIN
NORELL MARIA GERTRUD
AXEGARD PETER ALF

JP4206886A

September 11, 1986

February 28, 1986

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KEMANORUDO BUREKEMI AB

C01B7/01; B01D21/01; C01B11/02; C01B17/74; C13B20/12; B01D21/02; B01D21/24; (IPC1-7): C01B7/01; C01B11/02; C01B17/74

JPS57111205A	1982-07-10
JPS597641A	1984-01-14
JP34006425A
JP34004684A

Kazuho Kawarada

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