Liquefied petroleum gas consists of which constituents?

Liquefied gas is always referred to propane (C3H8) and butane (C4H) however, it is gas dissolved in oil which is produced by several methods such as pressure depletion and depends on initial reservoir temperature  in relation to the  liquid critical temperature and criondentherm.

mixes that are primarily propane (C3H8), primarily butane (C4H) and, most commonly, mixes including both propane and butane.

Propane and Butane (C3 and C4) only, but it depends upon the climatic and geographical condition blending will vary, area to area and season to season.

mostly of methane and is drawn from gas wells or in conjunction with crude oil production. As delivered through the pipeline system, it also contains hydrocarbons such as ethane and propane as well as other gases such as nitrogen, helium, carbon dioxide, sulphur compounds, and water vapour.

C1 ------> c5+

CO2

H2O

H2 

CO

N2 

mercaptans 

mercure 

helium