Liquefied petroleum gas is a kind of mixture of hydrocarbons with the main components C3 and C4. It has a low critical pressure, high critical temperature and low boiling point, so liquefied petroleum gas is in a state of gas under atmospheric temperature and atmospheric pressure. In order to store and transport it, raise its pressure or decrease the temperature to change it into liquid.
As a kind of chemical material and fuel used in manufacturing and life, liquefied petroleum gas has been paid much attention to. In production of chemical industry, ethene, propene, butane and butadiene can be separated from liquefied petroleum gas which can be used to produce synthetic plastics, synthetic rubber, synthetic fiber and medicine, explosives, dyestuff and other products. As a kind of fuel, liquefied petroleum gas has been widely used to replace the gasoline for its high heat value, no smog and dust and no carbonresidue. Besides, liquefied petroleum gas is also used to cut metals, bake agricultural products and roast industrial furnace.