LPG Gas Manufacturing Process: LPG Origin & How LPG is Made
LPG origin involves refining crude oil or processing raw natural gas, both 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, butane, and isobutane, with small fractions of other NGL gases.
LPG Constituents
LPG is comprised primarily of propane and butane, whilst the natural gas primary constituent is methane.
LPG is made up of a number of gases under the LPG products label, including propane, butane, isobutane and mixtures of these gases and are also referred to as natural gas liquids – NGL.
LPG is made up of carbon and hydrogen atoms forming propane and butane whilst natural gas is made up of lighter methane, the simplest carbon and hydrogen molecule.
LPG is made up of a group of flammable hydrocarbon gases that are liquefied through pressurisation and commonly used as fuel.
LPG Origin – Where Does LPG Originate From
LPG origin is from oil and gas wells, as it is a fossil fuel. 60% of LPG originates from natural gas processing “stripper plants” and 40% of LPG originates from the crude oil refinery process.
LPG is a fossil fuel that does not occur in isolation.
The LPG manufacturing process (LPG production process) starts with where LPG (propane) comes from – drilling oil and gas wells.
Then LPG process continues with LPG originating from two LPG gas manufacturing process sources: natural gas processing and crude oil refining, where it is a co-product of both.
LPG comes from a natural combination with other hydrocarbons.
How is Liquid Petroleum Gas Made? LPG Process
Liquid petroleum gas is made or LPG originates with natural gas processing and crude oil refining.
This is a precursor to the LPG process and LPG products, as it separates the LPG from the raw natural gas and oil, which is the beginning of the LPG refinery process.
Liquid petroleum gas is made by stripping it from the “wet” natural gas stream as it comes out of the well or separating it from the crude oil during LPG refinery process.
The LPG process continues with LPG fractionation, to separate the LPG into its constituent gases: propane, butane and isobutane.
It is then placed in large LPG tanks and LPG cylinders for storage and distribution.
LPG Manufacturing Process – Summary
LPG is manufactured by refining crude oil or processing raw natural gas, all of which are sourced from fossil fuel.
Liquefied through pressurization, LPG is easier to store and transport.
LPG is produced during fractional distillation of crude oil or is separated during natural gas processing.
To transport or store it, LPG gas needs to be liquefied under pressure.
LPG can be stored or transported in LPG gas cylinders or vessels.
If released from pressure, LPG gas is emitted.
LPG Plant Process Description – LPG Process Description – Summary
An LPG – Liquefied Petroleum Gas – plant process description summary starts with raw natural gas going through natural gas processing whilst the crude oil goes through fractional distillation of crude oil.
The NGL (natural gas liquids) condensate that results from both processes is then put through LPG fractionation to separate it into its constituent gases: propane, butane and isobutane.
It is then ready for use, after the addition of ethyl mercaptan, as the safety odourant.
LPG products include propane, butane, isobutane and mixtures of these gases and are also referred to as natural gas liquids – NGL.
The LPG process (LPG production process) consists of the natural gas refinery process, fractional distillation of crude oil and LPG manufacturing involving these hydrocarbons.
What is Natural Gas Made of
Natural gas is made of methane, propane, butane, isobutane, ethane, ethene, propene, isobutene, butadiene, pentane, pentene and pentanes plus, as raw unrefined natural gas.
Refined natural gas is made of almost entirely methane.
The LPG Name Game
What you get when you buy “LPG” can depend on the country you buy it in and/or the application.
In Australia, LPG is propane.
The exception is autogas, which can be a propane/butane blend.
In New Zealand, “LPG” is generally a propane/butane blend.
In the USA they call it “Propane”, which is what they sell, and generally don’t even use the term “LPG”.
LPG may also be referred to as a Natural Gas Liquids – NGLs – along with propane, butane, isobutane, ethane, pentane and pentanes plus (natural gasoline).
How is Cooking Gas Produced – How to Make LPG Gas
Cooking gas can be either LPG or natural gas.
LPG cooking gas is produced using the LPG manufacturing process that occurs during natural gas processing and oil refinery processing.
We make LPG and natural gas cooking gas during natural gas processing.
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Summary of the LPG Process
LPG origin is from being found naturally in combination with other hydrocarbons.
The LPG process (LPG production process) consists of the natural gas processing, fractional distillation of crude oil and LPG manufacturing involving these hydrocarbons.
Propane (LPG) is a naturally occurring gas but propane does not occur purely by itself.
Propane-LPG is produced (obtained) from the LPG gas manufacturing process (LPG production process) and comes from fractional distillation of crude oil, the separation and collection of the propane from its petroleum base.
About 60% of LPG gas (propane) originates from natural gas processing followed by LPG gas manufacturing of the raw natural gas that comes out of the wellhead.
The other 40% of LPG (propane) is produced (obtained) during the fractional distillation of crude oil.
LPG gas manufacturing process isolates from the hydrocarbon mixtures by its separation during natural gas processing or by the fractional distillation of crude oil.
Natural gas liquids (NGL) range obtained is from 1% to 10% of the natural gas flow.
Similarly, LPG produced (obtained) from fractional distillation of crude oil constitutes between 1% and 4% of the crude oil refining process.
Both LPG gas manufacturing processes (LPG production process) begin by drilling oil wells.
Following the LPG gas manufacturing process (how to make LPG), LPG is stored and distributed as a liquid under pressure until used, at which point it is utilised as either a liquid or a gas (vapour).
But there was a time when it went unappreciated…
Early Days of Wasted LPG
LPG is not a by-product.
LPG is a valuable co-product of the natural gas processing and crude oil refinery process that comes from a deliberate LPG gas manufacturing process.
In the early days of the oil refinery business, there wasn’t an established infrastructure or market for LPG.
The same was true of natural gas (methane).
As a result, the LPG and methane were wasted through flaring — the burning off of the unwanted gas.
This early practice from long, long ago led some people to refer to LPG as a by-product.
Sadly, flaring still goes on in some countries.
LPG Process – LPG Stripped from Natural Gas
Separating the Gas from the Oil
The gas/oil mixture is piped out of the well and into a gas trap, natural gas processing separates the stream into crude oil and “wet” gas, which contains LPG and natural gas.
This is a precursor to LPG gas manufacturing process (LPG production process).
The heavier crude oil sinks to the bottom of the trap and is then pumped into an oil storage tank to the oil refinery.
The “wet” gas, off the top of the gas trap, goes through a production process to separate the gasoline (petrol) from the natural gas and LPG.
Methane Production Process – Natural Gas Processing – Pipeline Quality Dry Natural Gas
Raw natural gas processing which starts at the well head with methane, ethane, ethene, propene, isobutene, butadiene, pentane, pentene and impurities.
The non-methane hydrocarbons must be separated from the methane.
Impurities such as water, carbon dioxide, nitrogen and hydrogen sulfide must be removed by further natural gas processing before either the refined pipeline quality dry natural gas (methane) can be used or the LPG process begun.
After the completion of natural gas processing, the refined and purified natural gas, which is mostly methane, pipeline quality dry natural gas is fed into the pipelines that supply our cities and towns.
Distribution of refined pipeline quality dry natural gas (methane) is typically handled by gas utility companies.
LPG Gas Manufacturing from Raw Natural Gas made of 8 Hydrocarbons
Refined natural gas is made of methane.
The LPG manufacturing process (LPG production process) involves separating the raw natural gas made of an intricate mixture of hydrocarbons, which includes the methane, ethane, ethene, propene, isobutene, butadiene, pentane, and pentene.
The LPG gas manufacturing process plants are frequently called “stripper plants”, as the LPG is obtained or stripped from the natural gas processing flow using the LPG manufacturing process.
Impurities must also be removed from the LPG products propane and butane or they will prevent the LPG from liquefying properly.
A refrigeration based LPG gas manufacturing process is common for recovery of LPG from a natural gas stream.
With this technique, the LPG gas manufacturing process (LPG production process) refrigerates the gas stream to obtain the LPG products.
Refrigeration is employed in three different LPG gas manufacturing process: expander plants, low temperature separation and combined processes.
Other LPG gas manufacturing process separation techniques may also be employed, including lean oil absorption.
This LPG can be used as a mixture or further separated into the LPG products propane, butane and isobutane, as needed.
The LPG products enter their own distribution network, where they eventually find the way to end users, including 45kg home LPG and commercial LPG users all around Australia and the world.
LPG Gas Manufacturing Process from Fractional Distillation of Crude Oil – NGL Fractionation Process
Crude oil refining process includes a variety of refining processes including fluid catalytic cracking, delayed cokers, and fractional distillation of crude oil.
LPG is one of the refined products obtained from this LPG gas manufacturing process (NGL fractionation process).
After desalting, the heated crude oil is pumped into the distillation tower for fractional distillation of crude oil.
In the LPG gas manufacturing process, fractions of the flow are obtained from the side of the distillation tower at various heights between the bottom and the top.
Each extraction point in the LPG gas manufacturing process (NGL fractionation process) is temperature controlled to obtain a specific fraction including gasoline, naphtha, kerosene, diesel, light gas oil and heavy gas oil.
These are then sent to unique streams for storage or possible further processing.
LPG Gas Manufacturing for Refining
LPG, with the lowest boiling point, is obtained from the top of the distillation tower, using the LPG gas manufacturing process (fractional distillation of crude oil).
This LPG product component can be used as a mixture or further separated into its three primary parts: propane, butane and isobutane.
This further LPG gas manufacturing process fractionation can be achieved with Depropaniser, Debutaniser and Deisobutaniser fractionators.
How is LPG Transported
To transport or store it, LPG gas needs to be liquefied under pressure.
LPG can be stored or transported in LPG gas cylinders or vessels.
LPG (propane) can be transported in a number of ways, including by ship, rail, tanker trucks, intermodal tanks, cylinder trucks, pipelines and local gas reticulation systems.
Final Thoughts
For something that exists naturally, the LPG gas manufacturing process (LPG production process) is complex and takes a lot of work to get LPG products to the point of use.
However, its clean burning, portability and versatility truly makes LPG worth the effort.
Eric Hahn has over a decade of experience in the LPG industry and has become a key figure in shaping how LPG is marketed and communicated. As the creator of one of the world’s first LPG blogs, Eric has authored over 200 technical posts, helping educate and inform the industry and consumers.
Eric has served on multiple committees for Gas Energy Australia and the World LPG Association (WLPGA), contributing to important discussions and advancements within the global LPG sector. He has presented at WLPGA Annual Conferences, sharing his expertise as a speaker, panellist, and panel chair.
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