Chlorine Dioxide

Definition - What does Chlorine Dioxide mean?

Chlorine dioxide is a chemical compound having the chemical formula ClO2. It occurs as a yellow greenish crystal and appears to be bright orange at -59 °C (-74 °F). Chlorine dioxide is one of the oxides of chlorine and is used as an oxidizing agent in water treatment and bleaching processes.

Corrosionpedia explains Chlorine Dioxide

Chlorine dioxide is a neutral compound that was discovered in 1814 by Sir Humphrey Davy. He produced the gas by pouring sulphuric acid (H2SO3) on potassium chlorate (KClO3). Then he replaced sulphuric acid with hypochlorous acid (HOCl). This reaction has been used to produce large quantities of chlorine dioxide. Alternatively, sodium chlorate (NaClO3) is used instead of potassium chlorate: 2NaClO3 + 4HCl + 2ClO2 + Cl2 + 2NaCl + 2H2O

Chlorine dioxide is widely used in:

  • Bleaching wood pulp and flour.
  • Water treatment, cleaning and chlorination (e.g., as a drinking water disinfectant).
  • Disinfectant manufacturing for products such as sanitizers.

Chlorine dioxide is non-corrosive. It’s a myth that chlorine dioxide corrodes stainless steel.

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