About Chlorine Dioxide


In the very early 1800s, researchers reported independently on a reaction of sulphuric acid with potassium chlorate [Cruickshank 1801; Chenevix 1802]. The yellow gas produced gave indications of the existence of a compound of oxygen and chlorine which Chenevix called hyperoxygenic muriatic acid. For a number of years, researchers thought that the gas was mixture of gasses than a single chemical species [Soubeiran 1831].
About a decade after the early work, H. Davy gave the name of “euchlorine” to a mixture of gases arising from a reaction of various chemicals, including potassium chlorate and hydrochloric acid [Davy 1811].

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Features of ClO2

Chlorine Dioxide (CAs No 10049-04-4) is an approved and allowed substance for human and animal consumption according to EU, USEPA, WHO standards and many national drinking water regulations

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Properties Of ClO2

At gas phase concentrations greater than 30% volume in air/  at partial pressures above 10 kPa, ClO2 may explosively decompose into chlorine and oxygen. The decomposition can be initiated by, for example, light, hot spots, chemical reaction, or pressure shock. Thus, chlorine dioxide gas is never handled in concentrated form, but is almost always handled as a dissolved gas in water in a concentration range of 0.5 to 10 grams per liter. Its solubility increases at lower temperatures: it is thus common to use chilled water (5 °C or 41 °F) when storing at concentrations above 3 grams per liter.In many countries, such as the USA, chlorine dioxide gas may not be transported at any concentration and is almost always produced at the application site using a chlorine dioxide generator.[7]

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What Is ClO2

Chlorine dioxide (ClO2) is a synthetic, green-yellowish gas with a chlorine-like, irritating odor.  Chlorine dioxide is very different from elementary chlorine, both in its chemical structure as in its behavior. Chlorine dioxide is a small, volatile and very strong molecule. In diluted, watery solutions chlorine dioxide is a free radical. At high concentrations it reacts strongly with reducing agents. Chlorine dioxide is an unstable gas that dissociates into chlorine gas (Cl2), oxygen gas (O2) and heat. When chlorine dioxide is photo-oxidized by sunlight, it falls apart. The end-products of chlorine dioxide reactions are chloride (Cl), chlorite (ClO) and chlorate (ClO3). At –59°C, solid chlorine dioxide becomes a reddish liquid. At 11°C chlorine dioxide turns into gas. Chlorine dioxide is 2,4 times denser than air.

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