1-Butene is a simple organic compound classified as an alkene, meaning it contains a carbon-carbon double bond. Its chemical formula is C4H8, and it exists in four different structural isomers, each with the double bond located at a different carbon atom in the carbon chain.

In terms of its properties, 1-butene is a colorless gas at room temperature and pressure. It is highly flammable and can form explosive mixtures with air. Its boiling point is approximately -6.3°C (-20.7°F). In industrial settings, it is typically stored and transported as a liquefied gas under pressure.

Chemical formula C4H8
CAS Number 106-98-9
IUPAC Name But-1-ene
Other names 1-Butylene, Ethylethylene, α-Butylene
Molecular Weight 56.108 gm
Appearance Colorless gas
Density 0.62 g/cm3



1-Butene is commonly used as a starting material in the production of various chemicals, including plastics, synthetic rubber, and fuel additives. It is also used as a monomer in the production of polyethylene and in the synthesis of other organic compounds. Additionally, it can be found naturally in certain plant sources and is produced industrially through the catalytic cracking of petroleum fractions.

  • Polyethylene Production: It’s a key raw material in the production of polyethylene, a widely used plastic in packaging, containers, pipes, and more.
  • Fuel Additive: It can be used as a blending component in gasoline to improve its octane rating and performance.
  • Chemical Intermediate: 1-Butene is used in the synthesis of various chemicals like butadiene, which is used in the production of synthetic rubber.
  • Solvent: In some cases, it serves as a solvent in chemical processes.
  • Flavor & Fragrance Industry: It can be used as a starting material in the synthesis of certain flavors and fragrances.

Environmental impact and sustainability of 1-Butene

The environmental consequences of 1-butene are contingent upon how it’s produced, utilized, and disposed of.

Manufacturing: If derived from fossil fuels, its production may contribute to greenhouse gas emissions and other pollutants. Yet, employing sustainable methods like bio-based processes could mitigate its environmental footprint.

Air Quality: 1-butene’s production and usage can emit volatile organic compounds (VOCs), exacerbating air pollution and smog formation.

Water Contamination: Inadequate disposal of 1-butene or its derivatives may contaminate water sources, jeopardizing aquatic ecosystems and endangering aquatic life.

Waste Handling: Improper disposal of products containing 1-butene could lead to their accumulation in landfills, potentially posing long-term environmental risks.

Health Concerns: Human exposure to 1-butene, whether through inhalation or skin contact, can trigger respiratory and skin irritation.



This chemical is supplied in Isotank T50.