Hexane () is an organic compound
, a straight-chain alkane
with six carbon
atoms and has the molecular formula
Hexane is a significant constituent of gasoline
. It is a colorless liquid, odorless when pure, and with boiling points approximately . It is widely used as a cheap, relatively safe, largely unreactive, and easily evaporated non-polar solvent
The term ''hexanes'' refers to a mixture
, composed largely (>60%) of hexane, with varying amounts of the isomeric compounds 2-methylpentane
, and, possibly, smaller amounts of nonisomeric C5
, and C7
(cyclo)alkanes. Hexanes is cheaper than hexane and is often used in large scale operations
not requiring a single isomer
(e.g., as cleaning solvent
or for chromatography
In industry, hexanes are used in the formulation of glue
s for shoes, leather
products, and roofing. They are also used to extract cooking oil
s (such as canola oil
or soy oil) from seeds, for cleansing and degreasing
a variety of items, and in textile manufacturing. They are commonly used in food based soybean oil
extraction in the United States, and are potentially present as contaminants in all soy food products in which the technique is used; the lack of regulation by the FDA
of this contaminant is a matter of some controversy.
A typical laboratory use of hexanes is to extract oil
contaminants from water and soil for analysis. Since hexane cannot be easily deprotonated
, it is used in the laboratory for reactions that involve very strong bases, such as the preparation of organolithium
s. For example, butyllithiums are typically supplied as a hexane solution.
Hexanes are commonly used in chromatography
as a non-polar solvent. Higher alkanes present as impurities in hexanes have similar retention times as the solvent, meaning that fractions containing hexane will also contain these impurities. In preparative chromatography, concentration of a large volume of hexanes can result in a sample that is appreciably contaminated by alkanes. This may result in a solid compound being obtained as an oil
and the alkanes may interfere with analysis.
Hexanes are chiefly obtained by refining crude oil
. The exact composition of the fraction depends largely on the source of the oil (crude or reformed) and the constraints of the refining. The industrial product (usually around 50% by weight of the straight-chain isomer) is the fraction boiling at .
All alkanes are colorless. The boiling points of the various hexanes are somewhat similar and, as for other alkanes, are generally lower for the more branched forms. The melting points are quite different and the trend is not apparent.
Hexane has considerable vapor pressure
at room temperature:
Like most alkanes, hexane characteristically exhibits low reactivity and are suitable solvents for reactive compounds. Commercial samples of n-hexane however often contains methylcyclopentane
, which features tertiary C-H bonds, which are incompatible with some radical reactions.
Inhalation of ''n''-hexane at 5000 ppm for 10 minutes produces marked vertigo; 2500-1000 ppm for 12 hours produces drowsiness
, loss of appetite, and paresthesia
in the distal extremities; 2500–5000 ppm produces muscle
weakness, cold pulsation in the extremities, blurred vision, headache
. Chronic occupational exposure to elevated levels of n-hexane has been demonstrated to be associated with peripheral neuropathy
in auto mechanics
in the US, and neurotoxicity
in workers in printing presses, and shoe and furniture factories in Asia, Europe, and North America.
The US National Institute for Occupational Safety and Health
(NIOSH) has set a recommended exposure limit
(REL) for hexane isomers (not n-hexane) of 100 ppm () over an 8-hour workday. However, for n-hexane, the current NIOSH REL is 50 ppm () over an 8-hour workday.
This limit was proposed as a permissible exposure limit
(PEL) by the Occupational Safety and Health Administration
in 1989; however, this PEL was overruled in US courts in 1992. The current n-hexane PEL in the US is 500 ppm ().
Hexane and other volatile hydrocarbons (petroleum ether
) present an aspiration
risk. ''n''-Hexane is sometimes used as a denaturant
for alcohol, and as a cleaning agent in the textile
, and leather industries. It is slowly being replaced with other solvents.
Like gasoline, hexane is highly volatile and is an explosion risk. Ignition of hexane vapors which had been illegally discharged in the sewers of Louisville (Kentucky) from a soybean
processing plant owned by Ralston-Purina
caused a series of explosions
which destroyed more over 21 km of sewer lines and streets in that city.
hexane poisoning has occurred with Japan
workers, Italian shoe
press proofing workers, and others. Analysis of Taiwanese workers has shown occupational exposure to substances including ''n''-hexane. In 2010–2011, Chinese
workers manufacturing iPhone
s were reported to have suffered hexane poisoning.
Hexane was identified as being the cause of the Louisville sewer explosions
on 13 February 1981, that destroyed more than 13 miles (21 km) of sewer lines and streets in the center of Louisville
in Kentucky, United States
''n''-Hexane is biotransformed to 2-hexanol
and further to 2,5-hexanediol
in the body. The conversion is catalyzed by the enzyme cytochrome P450
utilizing oxygen from air. 2,5-Hexanediol may be further oxidized to 2,5-hexanedione
, which is neurotoxic
and produces a polyneuropathy
In view of this behavior, replacement of ''n''-hexane as a solvent has been discussed. ''n''-Heptane
is a possible alternative.
External linksInternational Chemical Safety Card 1262
(2-methylpentane)Phytochemica l database entry
*Australian ttps://web.archive.org/web/20090912082512/http://www.npi.gov.au/database/substance-info/profiles/47.html National Pollutant Inventory (NPI)
page"EPA does not consider n-hexane classifiable as a human carcinogen."
Federal Register / Vol. 66, No. 71 / Thursday, 12 April 2001 / Rules and Regulations
Category:Hazardous air pollutants