C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
23/1, 23/147, 23
C01B 11/02 (2006.01) C01B 7/03 (2006.01) C01D 5/00 (2006.01)
Patent
CA 1078139
ABSTRACT OF THE DISCLOSURE A mixture containing chlorine dioxide, chlorine and alkali metal salt is continuously generated; in the process an alkali metal chlorate, an alkali metal chloride and a strong mineral acid comprising sulfuric acid are continuously reacted in a single vessel generator-evaporator-crystallizer in pro- portions to generated chlorine dioxide and chlorine, in the absence of a catalyst; the acidity of the reaction solution is maintained within the range of from above 4 to about 11; and the reaction solution is subjected to a vacuum to effect evaporation of water vapor; chlorine dioxide and chlorine are withdrawn in admixture with the water vapor and alkali metal salt of the mineral acid is crystallized within the generator-evaporator-crystallizer and continuously withdrawn therefrom; in the improvement of the invention alkali metal salt crystals produced in the generator-evaporator- crystallizer are continuously passed in the form of a slurry into the top of a separatory column, in a downward flow while countercurrently a stream of hot water is passed continuously upwardly through the column at a rate sufficient to effect washing of the downwardly flowing crystals, whereby chlorate, chloride and acid values recovered therefrom are continuously and substantially completely returned to the generator-evaporator- separator, and acid salt crystals are converted to neutral acid salt crystals; the substantially pure neutral alkali metal salt crystal slurry is removed from the bottom of the separatory column; the process has particular utility in treating sulfur- containing effluent emanating from chlorine dioxide generators.
338891
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