1-Butene also known as 1-butylene, is an alkene with the chemical formula C4H8. It is a gaseous hydrocarbon with four carbon atoms and eight hydrogen atoms, featuring a double bond between the first and second carbon atoms. This unsaturated compound exists as two isomers, cis-1-butene and trans-1-butene, which differ in the spatial arrangement of their atoms.


Production of 1-Butene

1-Butene is primarily produced as a byproduct of crude oil refining and steam cracking processes. During these operations, larger hydrocarbons, such as butanes, undergo thermal cracking, leading to the formation of 1-butylene and other valuable compounds. Additionally, it can be obtained through catalytic dehydrogenation of butanes or through metathesis reactions.


Chemical formulaC4H8
Molar mass56.108 g·mol−1
Other namesEthylethylene, 1-Butylene, α-Butylene, But-1-ene
Melting point−185.3 °C
Density0.62 g/cm3
Boiling point−6.47 °C
AppearanceColorless gas


  • Polymer Manufacturing
  • Fuel Additive
  • Solvent
  • Intermediate in Chemical Synthesis


This chemical is supplied in Isotank T50.

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