What is composition of LPG?

Liquefied petroleum gas (LPG) is obtained by

  • Liquefaction of the uncondensed gases from the fractionating column during refining of crude petroleum oil.
  • The thermal cracking of heavy petroleum oil.
  • The condensed gases from refineries are cooled and compressed to a liquid state. The liquefied gases are stored in cylinders.


  • LPG contains colourless and odourless hydrocarbons such as propane, butane, little amounts of pentane and hexane.
  • It contains small amounts of amyl mercaptan or thiophene which acts as leakage indicators due to their characteristic odour.

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