DE1467024A1 - Process for the production of pure chlorine dioxide in aqueous solution - Google Patents

Description

GERMAN GOLD »AND SILVER SCHEIDEANSTALT FORMERLY ROSSSLBR Frankfurt am Main, Weissfrauenstrasse 9

Process for the production of pure chlorine dioxide in aqueous

'. solution

The invention has a method for producing pure chlorine dioxide in aqueous solution to the subject in which duroh treatment Chlorite solutions with chlorine water completely convert the chlorite to chlorine dioxide. The solution from Pure chlorine dioxide is an advantageous bactericidal agent and for the disinfection and purification of drinking water «

When using chlorine dioxide for a wide variety of purposes it is often necessary to remove the chlorine dioxide - also as a result of it Explosivity - to be produced at the place of use where in generally the highest possible degree of purity is required «

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Many methods have become known, which one solution aspired to this task, but on the one hand duroh to grooved sales were too uneconomical or on the other hand by rreisetsuvm ν · η Chlorine does not fully satisfy the purity requirements. could gen.

So it is z. B. known, chlorine dioxide du raw conversion of Cbl * .r * tet "to be produced with mineral acids" Here, via di # via "· chloric acid (HClO ^) - to chlorine dioxide (010") · with constant * development of chlorine (Cl ₂ ) occurs, so that no pure Sndfr4dufct is obtained. ;

It is also known to düroh chlorine dioxide from solid carbonites Treatment with chlorine to produce. This procedure requires φΗ> ··· Safety devices, since the resulting gaseous ^ chlorine Dioxide in a concentration of, for example, 5 to 10 vol.jt in! air » especially over 10% by volume. tends to explode. Here too will free chlorine as a by-product, so this process for ordering a pure chlorine dioxide is also more expensive as a result

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and process steps are not very suitable.

It is also known that chlorine dioxide can be separated out by the action of acids on chlorites, with the formation of chlorous acid taking place as an intermediate stage. The reaction depends on the concentration and pH, and free chlorine is also produced.

Another known method is not used Stoohiometric quantities from the action of chlorine on chlorites obtained chlorine dioxide in aqueous solution, but none of them fully «· The conversion of chlorite to chlorine dioxide takes place. This reaction is pH-dependent.

The invention is based on the task of specifying a method, wefehes the production of pure chlorine dioxide in aqueous Solution by treating an aqueous ventilation of preventive Sodium chlorite with a chlorine solution when the reaction is complete de · chlorine! t »to chlorine dioxide enables.

The characteristic of the invention can be seen in the fact that the ι chlorite solution is reacted with an aqueous solution of chlorine, which is more than 0.5 β chlorine / 1 up to the maximum solubility of the · chlorine ·! in VMiir contains. Ventilation from Vatrluaohlorit is advantageously used as the exit product. , J

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In a furnace with a chlorine device, 1000 g of gaseous gas per hour are fed to an injector, which is charged with 2 £ 0 1 of water. Di · au · en »injector abfllessende Vasserraenge contains k $ 1 chlorine * Litter. In the aqueous chlorine solution, 8.6% of a 30 percent iron chloride solution are poured into a "Bealltionez ^ linder" with the help of a dosing puepe; This sodium chloride ventilation is diluted with 162 liters of water before entering the reaction cylinder. The dilution water is measured with the aid of a rotameter. Then 2580 g of Na-

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U67024

trium chlorite dissolved in 170.6 l of water with 250 l of chlorine water for reaction, because 1000 g of chlorine are contained in it. The resulting amount of dissolved chlorine dioxide is 1913 g. This highly concentrated aqueous chlorine dioxide solution with k.5h g of chlorine dioxide / l is diluted in the upper part of the reaction cylinder with 1000 l of additional water to a harmless chlorine dioxide concentration.

The analysis of a chlorine dioxide solution prepared according to this procedure contained chlorine = 0.02 g / l, chlorine dioxide = 1.3U g / l. The pH of this solution was pH »2.85.

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Claims (2)

U67024 Claim Process for the production of pure chlorine dioxide in aqueous solution by reacting stoichiometric amounts of aqueous chlorite, - Especially sodium chlorite, - and chlorine solutions, characterized in that the chlorite solutions with an aqueous chlorine solution are combined, which of 1.5 g chlorine / l up to the maximum solubility of chlorine in the water. September 2, 1968
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