C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/147, 23/318
C01B 11/02 (2006.01) C01B 7/03 (2006.01)
Patent
CA 1112424
PRODUCTION OF CHLORINE DIOXIDE Abstract In a process for continuously generating a mixture containing chlorine dioxide, chlorine and sulfate wherein (a) an alkali metal chlorate, a chloride and a mineral acid selected from sulfuric acid and mixtures of sulfuric acid with phosphoric and hydrochloric acid are continuously reacted in proportion to generate chlorine dioxide and chlorine; (b) the temperature is maintained within a range of from about 50 to about 100 degrees centigrade; (c) the acidity of the reaction solution is maintained within the range of about 2 to about 12 normal; (d) chlorine dioxide and chlorine produced by said reaction is withdrawn from the reactor; (e) water is removed and alkali metal salt of said mineral acid is crystallized in the form of an aqueous slurry containing minor amounts of chlorate, chloride and acid values; The improvement which comprises: continuously passing the slurry containing crystals of the alkali metal salt of the mineral acid and chlorate values into the top of a metathesis column, in a downward flow; countercurrently passing a stream of aqueous metathesis solution upward through said column at a rate and in amounts sufficient to effect reaction of said solution with said alkali metal salt converting said alkali metal salt to the salts of the metathesis solution whereby chlorate, chloride and acid values recovered therefrom are continuously and substantially returned to the reaction of (a) aforesaid.
278407
Hooker Chemicals & Plastics Corp.
Swabey Ogilvy Renault
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