Process for the production of chlorine dioxide
AssigneeAkzo Nobel N.V.
InventorsKalle Hans Thomas Pelin, Nils Torgny Björkman
Life of this patent
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Abstract
Process for the continuous production of chlorine dioxide comprising generating chlorine dioxide in an aqueous reaction medium in a reaction vessel (1) maintained at sub-atmospheric pressure, bringing gaseous chlorine dioxide from said reaction vessel to an absorption tower (7) and contacting it therein with a flow of water to form an aqueous solution containing chlorine dioxide, bringing said aqueous solution containing chlorine dioxide to a stripper (12), blowing a gas through said aqueous solution of chlorine dioxide in the stripper to strip off from 10 to 100% of the chlorine dioxide entering the stripper and form a gaseous chlorine dioxide product.
Claims18
A process for the continuous production of chlorine dioxide comprising
- generating chlorine dioxide in an acidic aqueous reaction medium in a reaction vessel maintained at sub-atmospheric pressure,
- bringing gaseous chlorine dioxide from said reaction vessel to an absorption tower and contacting it therein with a flow of water to form an aqueous solution containing chlorine dioxide,
- bringing said aqueous solution containing chlorine dioxide from the absorption tower to a stripper, and increasing the pH of the aqueous solution containing chlorine dioxide leaving the absorption tower to is from about 6.5 to about 7.8,
- blowing a gas through said aqueous solution of chlorine dioxide in the stripper to strip off from 10 to 100% of the chlorine dioxide entering the stripper and form a gaseous chlorine dioxide product obtained from the stripper with a partial pressure of from 0.5 to 20 kPa.
A process for the continuous production of chlorine dioxide comprising
- generating chlorine dioxide in an acidic aqueous reaction medium in a reaction vessel maintained at sub-atmospheric pressure,
- bringing gaseous chlorine dioxide from said reaction vessel to an absorption tower and contacting it therein with a flow of water to form an aqueous solution containing chlorine dioxide,
- bringing said aqueous solution containing chlorine dioxide from the absorption tower to a stripper, and increasing the pH of the aqueous solution containing chlorine dioxide leaving the absorption tower to is from about 6.5 to about 7.8,
- blowing a gas through said aqueous solution of chlorine dioxide in the stripper to strip off from 10 to 100% of the chlorine dioxide entering the stripper and form a gaseous chlorine dioxide product obtained from the stripper with a partial pressure of from 0.5 to 20 kPa, wherein the gaseous chlorine dioxide product has a content of elemental chlorine less than 1 wt %.
Dependencies are inferred from the claim text.