Chemical composition and method
AssigneeAkzo Nobel N.V.
InventorsJoel Tenney, Gunilla Jadesjö, Cecilia Bojrup Andresen
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Abstract
The invention relates to a novel composition useful as a feed at production of chlorine dioxide, said composition being an aqueous solution comprising from about 1 to about 6.5 moles/liter of alkali metal chlorate, from about 1 to about 7 moles/liter of hydrogen peroxide and at least one of a protective colloid, a radical scavenger or a phosphonic acid based complexing agent, wherein the pH of the aqueous solution is from about 1 to about 4. The invention also concerns a process for producing chlorine dioxide using the novel composition
Claims30
A process for producing chloride dioxide comprising the steps of:
- (a) forming an aqueous premixture of from about 1 to about 6.5 moles/liter of alkali metal chlorate, from about 1 to about 7 moles/liter of hydrogen peroxide and at least lone of a protective colloid, a radical scavenger of a phosphonic acid based complexing agent, wherein the pH of the premixture is from about 1 to about 4, said premixture having a rate of decomposition of hydrogen peroxide of no more than 5% by weight after fourteen days;
- (b) storing said premixture in a vessel;
- (c) transporting said stored premixture to a chlorine dioxide site having a reactor;
- (d) feeding a mineral acid and said transported premixture to said reactor;
- (e) reducing chlorate ions in the reaction mixture in said reactor to form chlorine dioxide, wherein the degree of chlorate conversion to chlorine dioxide in said reactor is from about 75% to 100%;
- and
- (f) recovering a product Containing chlorine dioxide from said reactor.
A process for producing chloride dioxide comprising the steps of:
- (a) forming an aqueous premixture of from about 1 to about 6.5 moles/liter of alkali metal chlorate, from about 1 to about 7 moles/liter of hydrogen peroxide and at least one of a protective colloid, a radical scavenger or a phosphonic acid based complexing agent, wherein the pH of the premixture is from about 1 to about 4, said premixture having a rate of decomposition of hydrogen peroxide of no more than about 5% by weight after fourteen days;
- (b) transporting said premixture to a chlorine dioxide reactor site having a reactor;
- (c) storing said transported premixture on said site;
- (d) feeding a mineral acid and said premixture to said reactor;
- (e) reducing chlorate ions in the reaction mixture in said reactor to form chlorine dioxide, wherein the degree of chlorate conversion to chlorine dioxide in said reactor is from about 75% to 100%;
- and
- (f) recovering a product containing chlorine dioxide from said reactor.
Dependencies are inferred from the claim text.