What does propylene mean?
Propylene, also called propene, is a colourless, flammable gaseous hydrocarbon with the formula C₃H₆. It belongs to the alkene family of unsaturated hydrocarbons, whose molecules contain a carbon–carbon double bond. Propylene is produced in large quantities during the refining or cracking of hydrocarbons and is an important industrial feedstock. It can be polymerised to make polypropylene, and it is also used in producing propylene oxide, propylene glycol, synthetic rubbers, and other chemical intermediates. In technical and manufacturing contexts, the word refers both to the gas itself and to the propylene unit used as a building block in larger molecules. Although relatively unfamiliar outside specialist subjects, propylene is central to the manufacture of plastics, synthetic fibres, packaging, automotive components, and numerous everyday products.
nounPropylene is a colourless, flammable gaseous hydrocarbon with the formula C₃H₆, formally known as propene. It is an alkene used as an industrial feedstock for producing plastics, synthetic fibres, resins, and many chemical compounds.
- The chemical compound propene, a colourless gaseous hydrocarbon with the molecular formula C₃H₆.
- The unsaturated hydrocarbon unit used in the production of polymers and other industrial chemicals.
"Propylene is fed into a reactor to produce polypropylene, one of the most widely used plastics in the world."
"The plant separates propylene from a mixed hydrocarbon stream before sending it to the polymerisation reactor."
"Researchers are investigating catalysts that could make propylene production more energy-efficient."
Propylene is the starting point for materials that seem unrelated—from plastic bottles and food packaging to synthetic fibres and automotive parts.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does propylene come from?
The name belongs to systematic chemical nomenclature: prop- indicates a three-carbon hydrocarbon framework, while -ylene is used for an unsaturated hydrocarbon. Related names such as propane, propene, and propyl reflect the same three-carbon chemical grouping. The terminology developed through nineteenth-century efforts to give organic compounds consistent, descriptive names.
How propylene is actually used
The term is chiefly used in chemistry, petrochemicals, manufacturing, and industrial-process contexts. It is normally treated as a technical noun rather than as a general everyday word.
Easily confused with propylene
Propylene is the gaseous alkene used as a chemical feedstock, whereas polypropylene is the solid polymer made by joining many propylene molecules together.
Polyethylene is a polymer made from ethylene, a different alkene; it is not made directly from propylene.