nheptano

N-heptane is the straight-chain seven-carbon alkane with the chemical formula C7H16. It is the normal isomer of heptane and is a component of crude oil and refined fuels. Like other alkanes, it is a nonpolar, saturated hydrocarbon and is typically colorless and flammable. At room temperature it exists as a volatile liquid and is insoluble in water.

Physically, n-heptane has a boiling point around 98 °C and a melting point well below room temperature, placing it among lighter hydrocarbons used in various industrial applications. It is less dense than water and has limited miscibility with water, while mixing readily with many organic solvents and other hydrocarbons. In petroleum technology, n-heptane is one of the straight-chain hydrocarbons present after refining and fractionation.

Uses and role in industry include serving as a solvent in laboratories and manufacturing, particularly for nonpolar compounds. It is also used as a reference fuel component in octane rating systems, where pure n-heptane is assigned an octane value of zero, complementing highly branched isomers such as iso-octane to establish the scale. In analytical chemistry, it is employed as a nonpolar solvent in chromatography and related techniques.

Safety and handling notes: n-Heptane is highly flammable and its vapors can form explosive mixtures with air. Exposure can irritate the eyes and respiratory system and prolonged inhalation may affect the central nervous system. It should be stored in a cool, well-ventilated area away from ignition sources and used with appropriate personal protective equipment.