C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
22/147, 23/318
C01B 11/02 (2006.01)
Patent
CA 1115026
ABSTRACT OF THE DISCLOSURE A process is provided for continuously generating a mixture containing chlorine dioxide, chlorine and a neutral alkali metal salt wherein an alkali metal chlorate, a reducing agent selected from the group consisting of methanol and sulfur dioxide, and a strong mineral acid selected from the group consisting of sulfuric acid, hydro- chloric acid and mixtures of sulfuric acid and members of the group consisting of hydrochloric acid and phosphoric acid, are continuously reacted in a single vessel generator- evaporator-crystallizer in proportions to generate chlorine dioxide and chlorine; the temperature is maintained from about 50 to about 100°C.; the acidity of the reaction solution is maintainedwithinthe range of about 2 to about 12 normal; chlorine dioxide and chlorine produced by the reaction are withdrawn from the reactor; water is removed and neutral alkali metal salt of said mineral acid is crystallized in the form of an aqueous slurry containing minor amounts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 resides in continuously passing the slurry con- taining neutral alkali metal salt crystals into the top of a separatory column, in a downward flow; countercurrently passing a stream of water continuously upwardly through the column at a rate sufficient to effect washing of the down- wardly flowing crystals whereby chlorate, chlorine and acid values recovered therefrom are continuously and substantially completely returned to the reaction of (a) aforesaid; and continuously removing an aqueous slurry of substantially pure neutral alkali metal salt crystals from the bottom of said separatory column.
362591
Hooker Chemicals & Plastics Corp.
Sherman
LandOfFree
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