LPG is manufactured by refining crude oil or raw natural gas, being derived exclusively from fossil fuel sources. It is stripped from the wet natural gas stream during natural gas processing and is a co-product of refining crude oil.
Whilst liquid under pressure when released from pressure at ambient temperature, it is gaseous. It is stored and transported in LPG cylinders as a liquid under moderate pressure.
The gases produced in the LPG production process are mainly propane and butane, with small fractions of other NGL gases.