LPG – Liquefied Petroleum Gas – describes flammable hydrocarbon gases including propane, butane and mixtures of these gases.
LPG, liquefied through pressurisation, comes from natural gas processing and oil refining.
LPG is used as heating, cooking and auto fuel.
In different countries, what is supplied can be propane, butane or propane-butane blends.
In Banglaesh LPG is just propane and butane. Propane is LPG but not all LPG is propane.

LPG comes from drilling oil and gas wells. It is a fossil fuel that does not occur in isolation. LPG is found naturally in combination with other hydrocarbons, typically crude oil and natural gas. LPG is produced during natural gas processing and oil refining. It is isolated, liquefied through pressurisation and stored in pressure vessels.

The typical LPG gases – propane and butane – are regarded as Natural Gas Liquids - NGLs. However, not all NGLs are LPG. Natural gas liquids, also called Condensate, include other hydrocarbons, too. Interestingly, LNG – liquefied natural gas – is NOT a natural gas liquid.

Raw natural gas, as it comes out of the ground, contains a number of gases and compounds, as well as impurities. However, it is predominantly methane (CH4) gas, which is more commonly known as natural gas. The raw natural gas must be processed to obtain pipeline quality clean, dry natural gas (methane), including the removal of impurities. In Bangladesh natural Gas contains 98% Methane. NGLs – Natural Gas Liquids – or condensate are the heavier hydrocarbons that remain after the methane (natural gas) and impurities are removed. NGLs include isobutane, ethane, propene, isobutene, pentene and pentanes plus, as well as propane and butane.

LPG is made during natural gas processing and oil refining. LPG is separated from unprocessed natural gas using refrigeration. LPG is extracted from heated crude oil using a distillation tower. This LPG can be used as is or separated into its three primary parts: propane, butane and isobutane. It is stored pressurised, as a liquid, in cylinders or tanks.

Propane does not occur naturally in isolation. LPG processing involves separation and collection of the gas from its petroleum base.
LPG is isolated from the hydrocarbon mixtures by separation from natural gas or by the refining of crude oil. Both processes begin by drilling oil/gas.
The gas/oil mixture is piped out of the well and into a gas trap, which separates the stream into crude oil and "wet" gas, which contains LPG and natural gas.
The heavier crude oil sinks to the bottom of the trap and is then pumped into an oil storage tank for refining.
Crude oil undergoes a variety of refining processes, including catalytic cracking, crude distillation, and others.
One of the refined products is LPG.
The "wet" gas, off the top of the gas trap, is processed to separate the gasoline (petrol) from the natural gas and LPG.Once refined, LPG is stored as a liquid under pressure in gas bottles - cylinders or tanks. 45kg gas bottle.