초록 ▼

A method of forming an aqueous chlorine dioxide solution is disclosed which includes reacting in a reaction vessel an acid reaction solution containing a hydroxy carboxylic acid and a companion acid with an alkali metal salt of a chlorite ion. In accordance with the process, the hydroxy carboxylic a

A method of forming an aqueous chlorine dioxide solution is disclosed which includes reacting in a reaction vessel an acid reaction solution containing a hydroxy carboxylic acid and a companion acid with an alkali metal salt of a chlorite ion. In accordance with the process, the hydroxy carboxylic acid serves to temporarily transfer chlorine from and does not form a salt with the alkali metal salt of a chlorite ion. The aqueous chlorine dioxide solution produced is substantially free of chlorous acid and preferably is free of other by-products such as sodium chloride and free chlorine. The method further includes maintaining the reaction vessel at a pH of less than 5 and/or withdrawing at least a portion of the chlorine dioxide from the aqueous chlorine dioxide solution. The method enables rapid, efficient, compact and safe generation of chlorine dioxide. A method of disinfecting water, and apparatus for making chlorine dioxide and for disinfecting water also are provided.

대표청구항 ▼

[ What is claimed is:] [1.] A process for producing chlorine dioxide, comprising the steps of:A providing an aqueous acid solution comprising1 a hydroxy carboxylic acid that is capable of temporarily transferring chlorine from an alkali metal salt of chlorite ion, but substantially does not form a s

[ What is claimed is:] [1.] A process for producing chlorine dioxide, comprising the steps of:A providing an aqueous acid solution comprising1 a hydroxy carboxylic acid that is capable of temporarily transferring chlorine from an alkali metal salt of chlorite ion, but substantially does not form a salt with an alkali metal salt of a chlorite ion, and2 a companion acid that substantially does not react with an alkali metal salt of a chlorite ion;B combining, in a vessel, (i) an alkali metal salt of a chlorite ion, and (ii) said aqueous acid solution, to yield an aqueous reaction solution; andC maintaining the pH of the aqueous reaction solution at a value of .ltoreq.4 during the reaction of (i) and (ii), rein chlorite ions are produced in said aqueous reaction solution, and said chlorite ions react with said hydroxy carboxylic acid present therein to yield an aqueous product solution that comprises chlorine dioxide but is substantially free of chlorous acid.