What does butene mean?
Butene is a colorless, flammable hydrocarbon gas with the chemical formula C₄H₈, belonging to the alkene family of compounds characterized by a carbon–carbon double bond. It exists in several isomeric forms — notably 1-butene and the cis and trans variants of 2-butene, along with the branched isomer known as isobutylene — all sharing the same molecular formula but differing in structure. Produced commercially by the cracking and refining of petroleum, butenes serve mainly as industrial building blocks: they are copolymerized into polyethylene plastics, converted into butadiene for synthetic rubber, and used in making solvents and other chemicals. The name derives ultimately from Greek, reflecting chemists' recognition that the compound shares its four-carbon backbone with butyric acid, the substance responsible for rancid butter's odor. Though unfamiliar to most laypeople, butene is quietly ubiquitous, embedded in everyday plastics and packaging materials.
nounAny of three flammable gaseous hydrocarbons with the formula C₄H₈, each containing one carbon–carbon double bond and used chiefly in the manufacture of polymers and other organic chemicals.
- Any of three isomeric gaseous hydrocarbons of formula C₄H₈ (1-butene, cis-2-butene, trans-2-butene) containing one double bond, used as feedstocks in polymer production.
- The related branched isomer isobutylene (2-methylpropene), often grouped with butenes industrially.
"The refinery's cracking units yielded a steady stream of butene for the polymer plant downstream."
"Butene monomers are copolymerized with ethylene to tune the density of polyethylene plastics."
"In the laboratory, the students distinguished the cis and trans isomers of 2-butene by their boiling points."
The plural appears mainly in technical writing when referring collectively to the various isomers; more often writers name individual isomers instead.
"The stream contained a mixture of butenes, including both cis- and trans-2-butene."
Butene's name secretly points to your fridge: it comes from the Greek word for butter, because chemists first identified its carbon skeleton in butyric acid — the compound that gives rancid butter its smell.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of butene
The word butene combines 'but-', a stem taken from butyric acid, with '-ene', the standard suffix for alkenes introduced in nineteenth-century chemical nomenclature. Butyric acid itself derives from Latin butyrum and earlier Greek boutyron, meaning butter, so the name ultimately traces back to the ancient vocabulary of dairy. It thus forms a family with butane, butyl, and other compounds built on the same four-carbon stem.
How butene is actually used
A technical term used almost exclusively in chemistry, petrochemical engineering, and industrial contexts; rarely encountered outside these fields. In industry, the term 'butylene' is an older synonym still widely used, and 'isobutylene' refers specifically to the branched isomer. The plural is uncommon since speakers usually refer to specific isomers by name.
Easily confused with butene
Butane is a saturated hydrocarbon (C₄H₁₀) with only single bonds, whereas butene contains a carbon–carbon double bond (C₄H₈), making it more chemically reactive.