Liquefied petroleum gas (LPG) is a colorless volatile liquid obtained by pressurized and cooled liquefaction of natural gas or oil in a refinery. It is very easy to spontaneous combustion, when its content in the air reaches a certain concentration range, it can explode when it encounters an open flame. The LPG obtained through the refinery is mainly composed of propane, propylene, butane, butene or one or two, and it is also doped with a small amount of pentane, pentene and trace sulfide impurities.

Liquefied petroleum gas (LPG) is mainly used as petrochemical raw material for cracking hydrocarbons to ethylene or steam conversion to syngas, and can be used as industrial, civil and internal combustion engine fuel.