Hexane: Properties and Applications

What is hexane and how is it used in laboratories?

Hexane (C₆H₁₄) is a straight-chain alkane used primarily as a non-polar solvent in laboratories and industrial settings. It is widely employed in the extraction of vegetable oils from seeds and in the purification of chemical compounds. Its low boiling point (69 °C) allows for easy removal by evaporation, making it ideal for solvent recovery processes. In analytical chemistry, hexane is used in gas chromatography (GC-MS) and as a mobile phase in certain chromatographic techniques. Due to its flammability and potential toxicity, it is handled with care under fume hoods and with appropriate personal protective equipment.

What are the safety and regulatory considerations for hexane?

Hexane poses significant health and environmental risks. Prolonged exposure, especially via inhalation, can lead to neurotoxic effects, including peripheral neuropathy. Regulatory bodies such as the UK Health and Safety Executive (HSE), the European Chemicals Agency (ECHA), and the US Environmental Protection Agency (EPA) classify hexane under REACH and GHS as hazardous. It is listed in the UK's Control of Substances Hazardous to Health (CoSHH) regulations. The use of hexane is restricted in some applications, and safer alternatives such as heptane or supercritical CO₂ are increasingly preferred. Proper storage, ventilation, and disposal in accordance with UK environmental standards are mandatory.

Related concepts

Hexane is often compared with other hydrocarbon solvents like heptane and octane. Its use is regulated under ISO 17025 and ISO 14001 standards for laboratory and environmental management. It is also subject to compliance with UK statutory instruments related to workplace exposure limits (WELs) and chemical safety data sheets (SDS).