Carbon Dioxide - Products - Irish Oxygen Company Ltd

By: Irish Oxygen Company  05/12/2011
Keywords: gas, Physical Properties, Critical Temperature

Carbon dioxide's inert qualities make it useful for preventing or suppressing combustion or oxidisation. It is also used as a refrigerant or cooling agent.

The gas dissolves easily in water, making the resultant solution slightly acidic. As a result, it is often used to balance the pH of water in preference to the addition of mineral acids. Its solubility also makes it a chosen method for putting the "fizz" into drinks of all kinds.


  • Colourless
  • Odourless
  • Slightly acid-tasting gas
  • Heavier than air
  • Freezes to a solid at atmospheric pressure
  • Liquefies under pressure
  • Water-soluble
  • Does not support combustion


  • Food freezing, chilling and refrigeration
  • Fire suppression
  • Alkali neutralisation, swimming pool water treatment, waste treatment
  • Mould setting
  • Inert gas pressurisation
  • Beverage carbonation
  • Oil well recovery
  • Plant growth

Physical Properties

Gas Carbon Dioxide
Chemical formula CO2
Molecular weight 44.0
Gas density 1.87 Kg/m3
SG vapour 1.53
Boiling point -78.5°C
Critical temperature -30.1°C
Critical pressure 73.8 bar


Carbon dioxide is produced in a variety of ways. It can be produced by either combustion or oxidation of materials containing carbon (e.g. coal, wood, oil, etc.), by fermentation of sugars, or by the decomposition of carbonates under the influence of heat or acids. Commercially, carbon dioxide is recovered from the fermentation processes and as a by-product in the commercial production of ammonia.

Keywords: Critical Temperature, gas, Gas Density, Physical Properties

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