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General
- Chlorine dioxide is a
chemical compound with the formula ClO2.
- This reddish-yellow gas
crystallizes as orange crystals at −59 °C. As one of several oxides of
chlorine, it is a potent and useful oxidizing agent used in water
treatment and in bleaching.
Production
- Over 95% of the
chlorine dioxide produced in the world today is made from sodium
chlorate and is used for pulp bleaching. It is produced with high
efficiency by reducing sodium chlorate in a strong acid solution with a
suitable reducing agent such as hydrochloric acid and sulfur dioxide.
- In later years, a
growing proportion of the chlorine dioxide made globally for water
treatment and other small scale applications has been made using the
chlorate, hydrogen peroxide and sulfuric acid method which can produce a
chlorine free product at high efficiency.
Uses
- Chlorine dioxide is
used primarily greater than 95% for bleaching of wood pulp, but is
also used for the bleaching of flour and for the disinfection of
municipal drinking water.
- Chlorine dioxide is
used as an oxidant for phenol destruction in waste water streams,
control of zebra and quagga mussels in water intakes and for odor
control in the air scrubbers of animal byproduct rendering plants.
- Chlorine dioxide is
used in many industrial water treatment applications as a biocide
including cooling towers, process water and food processing.
Report
- It can also be
used for air disinfection, and was the principal agent used in the
decontamination of buildings in the United States anthrax attacks.
- The use of
chlorine dioxide in water treatment leads to the formation of the
by-product chlorite which is currently limited to a maximum of 1 ppm
in drinking water in the USA.
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