BUTANE

Butane a gaseous alkane obtained either from the gaseous fraction of crude oil or by the ‘cracking’ of heavier fractions. 
Butane is easily liquefied and its main use is as a portable supply of fuel (bottle gas).
Butane is the fourth member of the homologous series of alkanes.

CAS Number: 54597-66-9
Molecular Formula: C8H20
Molecular Wight: 116.25
EINECS Number: 203-448-7

Synonyms: BUTANE, n-Butane, 106-97-8, Diethyl, Methylethylmethane, Butanen, Butani, Butyl hydride, HC 600, A 21 (blowing agent), R 600, n-Butan, 6LV4FOR43R, E943a, n-C4H10, INS NO.943, DTXSID7024665, INS-943, E-943, R-600, CHEBI:37808, E 943a, E-943a, normal-Butane, RefChem:6622, DTXCID404665, 203-448-7, Butane [NF], butane phase II, Butane (NF), butan, Butane pure, Butanen [Dutch], Butani [Italian], BUTANE (D10), BUTANE (1-D1), BUTANE (2-D1), CCRIS 2279, HSDB 944, EINECS 203-448-7, UN1011, UNII-6LV4FOR43R, 1,2-dimethylethane, 1,2-dimethyl-ethane, Butane 99%, Freon 600, BUTANE [HSDB], BUTANE [FCC], BUTANE [WHO-DD], BUTANE [II], BUTANE [MI], BUTANE [MART.], SCHEMBL221, EC 203-448-7, SCHEMBL1167, SCHEMBL1217, SCHEMBL3593, Polyethylene (High Density), SCHEMBL12318, SCHEMBL34390, SCHEMBL39412, SCHEMBL43209, SCHEMBL49352, SCHEMBL132548, SCHEMBL381622, SCHEMBL430377, SCHEMBL592736, SCHEMBL645108, SCHEMBL814421, SCHEMBL828215, SCHEMBL974976, CHEMBL134702, H-C4H9, SCHEMBL1006146, SCHEMBL1013786, SCHEMBL1272654, SCHEMBL1275981, SCHEMBL1276563, SCHEMBL2219098, SCHEMBL3965104, SCHEMBL4136328, SCHEMBL4143493, SCHEMBL4394967, SCHEMBL4550700, SCHEMBL5399479, SCHEMBL7043784, SCHEMBL19066806, Butane-1,1,1,4,4,4-d?, Butane 2000 µg/mL in Methanol, MFCD00009424, AKOS015917446, AKOS032949915, UN 1011, B0677, NS00008355, C21390, D03186, Q134192, Butane fuel for Micro Torch contains no CFC gases, InChI=1/C4H10/c1-3-4-2/h3-4H2,1-2H, 06005800-A997-4214-BF1C-5063E9E46167, ALKANE C4;BUTANES;BUTANE;BUTANES FUEL FOR MICROTORCH (1PK = 6 X&;Butanes, fuel for Micro Torch;Q GAS;QUENCH GAS

Butane is an alkane with the formula C 4H 10. 
Butane exists as two isomers, n-butane, CH 3CH 2CH 2CH 3 and iso-butane, (CH 3) 3CH. 
Both isomers are highly flammable, colorless, easily liquefied gases that quickly vaporize at room temperature and pressure.

Butane (C₄H₁₀) is a hydrocarbon gas belonging to the alkane family, made of four carbon atoms and ten hydrogen atoms. 
It is a colorless, highly flammable gas at room temperature that is commonly used as a fuel, liquefied petroleum gas (LPG) component, refrigerant, propellant, and chemical feedstock because it easily liquefies under moderate pressure and releases a large amount of energy when burned.
It is one of the main gases found in natural gas and crude oil refining.

Butane improves energy storage and portable fuel applications.
Chemically, butane is a saturated hydrocarbon (alkane) with single carbon–carbon bonds, making it relatively stable under normal conditions but highly reactive in combustion reactions with oxygen.

Butane exists mainly as two isomers: n-butane and isobutane.
This improves fuel versatility and chemical utility.
Physically, butane is a colorless gas with a mild petroleum-like odor in commercial form (odorized for safety). 

Butane can be easily liquefied under pressure, which allows it to be stored in portable containers such as gas cylinders and lighters.
It has a relatively low boiling point, making it useful as a fuel in cold conditions.
Butane improves portability and energy convenience.

Functionally, butane is primarily used as an energy carrier and fuel gas, as well as a refrigerant and aerosol propellant, due to its high energy density and ease of liquefaction.
Its properties make it suitable for both household and industrial applications.
Butane improves energy efficiency and application flexibility.

Butane is best described as a flammable alkane gas used mainly as a fuel and energy source in LPG systems, heating, cooking, lighters, aerosols, and chemical production processes.
Butane plays an important role in energy storage and transport, because it can be easily compressed into a liquid at moderate pressure and then vaporized on demand. This makes it much more practical to store and transport than gaseous fuels like methane under normal conditions.
This is why it is widely used in portable fuel systems.

Butane improves energy density and storage convenience.
In combustion science, butane is often used as a reference fuel in experiments because its combustion behavior is well understood and produces a relatively clean flame under controlled oxygen conditions.

Butane is useful for studying flame speed, heat release, and emissions formation.
This improves scientific modeling of hydrocarbon combustion.

In isomer chemistry, the two forms of butane (n-butane and isobutane) show how molecular structure affects physical properties like boiling point and volatility, even though they share the same chemical formula.
Isobutane is more branched and has slightly different combustion and vaporization behavior.
Butane improves understanding of structure–property relationships.

In cold-weather fuel performance, butane is less efficient than propane at very low temperatures because it has a higher boiling point, meaning it vaporizes less easily in cold environments.
This is why LPG blends are adjusted seasonally.
Butane improves fuel system optimization.

In refinery operations, butane is separated from crude oil fractions and natural gas liquids during processing and can be upgraded or converted into higher-value products such as gasoline components or petrochemicals.
It is part of the light hydrocarbon fraction stream.
Butane improves refinery efficiency and fuel production.

In chemical synthesis, butane is used indirectly to produce intermediates like maleic anhydride (from oxidation processes), which is used in resins, plastics, and coatings.
Butane makes it an important industrial raw material beyond fuel use.
This improves industrial chemical manufacturing.

In environmental atmospheric chemistry, butane contributes to the formation of ground-level ozone and photochemical smog when it reacts with nitrogen oxides under sunlight as a volatile organic compound (VOC).
It participates in complex radical reaction chains in the atmosphere.
Butane improves understanding of air pollution chemistry.

In fire safety engineering, butane is classified as a highly flammable gas with a wide explosive range in air, meaning even small leaks in enclosed spaces can create ignition hazards.
This is why strict storage and ventilation rules are required.
Butane improves safety design and risk management.

In aerospace and laboratory applications, high-purity butane can be used as a calibration gas or controlled fuel source in combustion testing systems.
Butane provides reproducible energy output for experimental setups.
Butane improves measurement accuracy and testing reliability.

In consumer product design, butane is valued because it produces a nearly invisible flame, allowing compact and efficient devices like modern lighters and portable burners.
Butane s clean-burning characteristics (when sufficient oxygen is available) make it suitable for controlled ignition systems.
This improves usability and device efficiency.

Butane is also important in phase behavior science, because it exists as a gas at room temperature but can easily be liquefied under relatively low pressure. This gas–liquid transition is widely studied in thermodynamics to understand vapor pressure, boiling behavior, and phase equilibrium in hydrocarbons.
This makes it a model system in physical chemistry.
Butane improves understanding of phase transitions and fluid behavior.

In energy efficiency systems, butane has a high energy content per mass compared with many other fuels, which is why it is efficient for portable combustion applications even though it is not ideal for extreme cold environments.
Butane s energy density makes it useful where compact fuel storage is needed.
This improves portable energy efficiency.

In gas blending engineering, butane is carefully mixed with propane and other hydrocarbons in LPG to adjust flame characteristics, vapor pressure, and usability across different climates and seasons.
Butane allows gas suppliers to optimize performance for household and industrial users.
This improves fuel customization and system adaptability.

In thermal flame control, butane produces a relatively clean and controllable flame under proper air mixing, which is why it is used in laboratory burners and small heating devices where stable flame geometry is important.
Butane allows precise heat application in controlled environments.
This improves combustion control and laboratory usability.

In organic chemistry education, butane is commonly used as a simple example of alkane structure, isomerism, and combustion reactions, helping students understand basic hydrocarbon chemistry.
It is often one of the first hydrocarbons used in teaching molecular structure.
Butane improves chemical education and conceptual learning.

In aerosol formulation science, butane’s vapor pressure properties are used to design spray systems where liquid inside the container turns into gas upon release, creating pressure that expels the product.
Butane mechanism is fundamental to many consumer spray products.
This improves dispensing technology and product design.

Melting point: −138 °C (lit.)
Boiling point: −0.5 °C (lit.)
Density: 0.579 g/mL at 20 °C (lit.)
vapor density: 2.11 (vs air)
Flash point: -83 °C
form: gas
Dielectric constant: 1.4 (−1℃)

Butane is widely used in liquefied petroleum gas (LPG) mixtures, typically blended with propane, where it contributes to household cooking, heating, and portable gas systems.
Its ability to liquefy at relatively low pressure makes it easy to store in compact cylinders.
Butane improves domestic energy accessibility and portability.

In portable fuel systems, such as cigarette lighters and camping stoves, butane is preferred because it vaporizes easily at room temperature and provides a stable flame.
Butane is especially useful in small-scale combustion devices.
Butane improves convenience and controlled combustion.

In aerosol technology, butane is used as a propellant to push liquids out of spray cans (such as deodorants, hairsprays, and cleaning products).
Its liquefied form expands into gas when released, creating pressure inside the container.
Butane improves spray performance and product delivery.

In petrochemical industries, butane is used as a feedstock for producing chemicals such as butadiene (used in synthetic rubber) and other hydrocarbon derivatives.
Butane is also involved in isomerization processes to produce high-octane fuels.
Butane improves chemical production efficiency and fuel quality.

In refrigeration systems, isobutane (a form of butane) is used as a natural refrigerant (R-600a) in household refrigerators because it has low environmental impact compared with older synthetic refrigerants.
It provides efficient cooling with low energy consumption.
Butane improves refrigeration efficiency and environmental sustainability.

In gasoline blending, butane is sometimes added to fuel to improve volatility and help engines start more easily, especially in cold weather conditions.
However, seasonal regulations limit its use due to vapor pressure effects.
Butane improves fuel performance and engine starting behavior.

In industrial energy use, butane serves as a high-energy fuel in heating processes, burners, and metalworking applications where portable high-temperature flames are required.
It provides efficient combustion energy.
Butane improves industrial heating efficiency.

In chemical research, butane is used as a model hydrocarbon for studying combustion, reaction kinetics, and hydrocarbon behavior under controlled conditions.
Butane is also used in calibration gases.
This improves scientific understanding and measurement accuracy.

In environmental context, butane is a volatile organic compound (VOC) and contributes to air chemistry reactions in the atmosphere, but it is not considered highly persistent or bioaccumulative.
However, like other hydrocarbons, it contributes to smog formation under certain conditions.
Butane improves environmental impact awareness.

In hydrocarbon processing safety, butane is used as a reference compound in studying flammability limits, since it has a well-defined lower and upper explosive limit in air.
Butane is important for designing safe industrial environments.
Butane improves industrial hazard prevention and safety engineering.

In refinery economics, butane is not just a fuel but also a blending component that can be upgraded into higher-value gasoline fractions through isomerization and processing.
Butane increases its economic importance in fuel production chains.
This improves refinery value optimization.

In environmental monitoring, butane is used as an indicator compound for volatile organic compounds (VOCs) in air quality measurements, helping track emissions from fuel use and industrial processes.
Butane is part of standard atmospheric VOC profiling.
This improves pollution tracking and air quality assessment.

In cryogenic and low-temperature studies, butane’s condensation and freezing behavior are used to understand hydrocarbon behavior in cold environments, including pipeline transport and storage systems.
Butane is important for natural gas and petroleum engineering.
This improves low-temperature process design.

Uses Of Butane:
Butane is mainly used as a fuel gas, energy carrier, refrigerant, propellant, and chemical feedstock because it is easily liquefied, highly flammable, and energy-dense.
In household LPG systems, it is used for cooking and heating.
This improves portable energy supply.

In lighters and camping equipment, it is used as a portable fuel.
Butane improves convenience and ignition reliability.
In aerosol products, it is used as a propellant.

Butane improves spray delivery systems.
In refrigeration (R-600a), it is used as a natural refrigerant.
Butane improves cooling efficiency and environmental performance.

In petrochemical production, it is used as a feedstock for chemicals and fuels.
Butane improves industrial chemical synthesis.
Butane is mainly used as a fuel gas, energy carrier, aerosol propellant, refrigerant, and chemical feedstock because it is easily liquefied, energy-dense, and highly combustible.

In LPG systems, it is used for cooking and heating.
Butane improves portable household energy supply.
In lighters and portable burners, it is used as a fuel.

Butane improves ignition convenience and portability.
In aerosol products, it is used as a propellant.
Butane improves spray performance.

In refrigeration (R-600a), it is used as a natural refrigerant.
This improves cooling efficiency and environmental impact.
In chemical industry processes, it is used as a feedstock for petrochemicals.

This improves industrial production of fuels and materials.
Butane is mainly used as a fuel gas, aerosol propellant, refrigerant, chemical feedstock, and energy carrier because it is highly flammable, easily liquefied, and energy-dense.
In LPG systems, it is used for cooking and heating.

Butane improves household and portable energy use.
In lighters and burners, it is used as a portable fuel.
This improves ignition convenience.

In aerosol products, it is used as a propellant.
Butane improves spray delivery systems.
In refrigeration (R-600a), it is used as a natural refrigerant.

Butane improves cooling efficiency and environmental performance.
In chemical manufacturing, it is used as a feedstock for petrochemicals.
Butane improves industrial synthesis of fuels and materials.

Butane is mainly used as a fuel gas, energy carrier, aerosol propellant, refrigerant, and petrochemical feedstock because it is easily liquefied under pressure, has high energy density, and burns efficiently in controlled combustion systems.
In LPG (liquefied petroleum gas) systems, it is used for household cooking and heating, often blended with propane to adjust performance for different temperatures and applications.
Butane improves portable energy supply and usability.

In lighters and portable burners, it is used as a compact fuel source because it vaporizes easily at room temperature and produces a stable flame.
Butane improves ignition reliability and convenience.
In aerosol products, it is used as a propellant in sprays such as deodorants, hairsprays, and cleaning products by creating pressure as it vaporizes inside the container.

This improves spray function and product delivery.
In refrigeration systems (R-600a, isobutane), it is used as a natural refrigerant in household refrigerators due to its energy efficiency and lower environmental impact compared to older synthetic refrigerants.
This improves cooling efficiency and sustainability.

In petrochemical industry, it is used as a feedstock to produce chemicals such as butadiene and isobutylene, which are important for synthetic rubber, plastics, and fuel additives.
Butane improves industrial chemical production.
In gasoline blending, it is used to adjust fuel volatility and improve cold-start performance in engines, depending on seasonal fuel formulations.

Butane improves engine starting and fuel performance.
In industrial heating systems, it is used as a fuel in burners and heating equipment where portable, high-energy combustion is required.
Butane improves thermal energy supply and efficiency.

Safety Profile Of Butane:
Butane is considered a highly flammable and potentially dangerous gas, and most of its hazards are related to fire, explosion risk, and oxygen displacement rather than chemical toxicity.
The main hazard is extreme flammability. Butane ignites very easily in the presence of air and has a wide explosive range, meaning that even small leaks can form flammable or explosive mixtures in enclosed spaces.
Butane makes ignition sources (sparks, flames, hot surfaces) very dangerous near leaks.

Butane is the most critical safety risk of butane.
Another major hazard is asphyxiation in confined spaces. Butane is heavier than air, so it can accumulate near the ground in poorly ventilated areas and displace oxygen without warning.
Because it is colorless and odorless (unless odorized), people may not notice oxygen levels dropping.

Butane can lead to dizziness, unconsciousness, or death in extreme cases.
Direct exposure to high concentrations of butane gas can cause symptoms such as headache, dizziness, nausea, confusion, and in severe cases, loss of consciousness due to oxygen deprivation.
This is a physical effect from oxygen displacement rather than chemical poisoning.

Contact with liquid butane (or rapidly expanding gas) can cause cold burns (frostbite-like injuries) because the rapid evaporation absorbs heat from skin.
Butane can damage tissue on contact and requires immediate medical attention.
Butane is also a pressurized gas hazard, since it is stored in cylinders or lighters under pressure.