nbutano

N-Butane, or nbuto in some contexts, refers to the straight-chain isomer of the hydrocarbon C4H10 known as n-butane. It is one of the two structural isomers of butane, the other being isobutane (2-methylpropane). In its pure form, n-butane is a colorless, highly flammable gas at room temperature that can be readily liquefied under modest pressure.

Physical and chemical properties are typical of simple alkanes: n-butane is flammable and forms explosive mixtures with air. It is less dense than many liquids when in gaseous form and is often stored and transported as a liquefied gas in pressurized containers. Its boiling point is near −0.5 °C, which allows it to be stored as a liquid at modest pressures and ambient temperatures.

Occurrence and production involve natural gas processing and petroleum refining. n-Butane occurs in natural gas and other hydrocarbon mixtures and is separated during gas processing or crude oil refining. It is commonly collected as part of liquefied petroleum gas (LPG) mixtures and can be sold as a standalone product or blended with propane for various uses.

Applications include its use as a fuel for portable stoves, lighters, and heating devices, especially in regions where LPG is distributed as a mixed propane-butane supply. It also serves as a petrochemical feedstock for the production of lighter olefins and other chemicals through cracking or reforming processes.

Safety and handling emphasize flammability and the potential for asphyxiation in confined spaces. It is stored under pressure in specially designed cylinders and should be kept away from heat sources and ignition hazards.