Description
Hexane is a highly flammable, colorless, volatileliquid with a gasoline-like odor. The water/odor threshold is0.0064 mg/L and the air/odor threshold is 230- 875 mg/m'Molecular weight= 86.20; Specific gravity (H2O:1)= 0.66; .Boiling point = 68.9℃; FreezingMelting point= -139.49C; .Relative vapordensity (air= 1)= 3.0; V aporpressure = 124 mmHg at 20℃; Flash point=一21.6℃ (cc);Autoignition temperature = 225℃.Explosivelimits: .LEL= 1.1%， UEL= 7.5%. Hazard Identification (basedon NFPA-704 M Rating System): Health 1, Flammability3,Reactivity 0.Practically insolubleinwater;solubility = 0.002%. .
Chemical Properties
n-Hexane is a highly flammable liquid, usually isolated from crude oil, and has extensive industrial applications as a solvent in adhesive bandage factories and other industries.
It is highly toxic, triggering several adverse health effects, i.e., nausea, skin irritation, dizziness, numbness of limbs, CNS depression, vertigo, and respiratory tract irritation to animals and humans. Occupational exposure of industrial workers has demonstrated motor polyneuropathy. Workers associated with long-term glue sniffi ng showed adverse effects in the form of degeneration of axons and nerve terminals.
Chemical Properties
n-Hexane is a highly flammable, colorless,
volatile liquid with a gasoline-like odor. The water/odor
threshold is 0.0064 mg/L and the air/odor threshold is
230 875 milligram per cubic meter.
Physical properties
Clear, colorless, very flammable liquid with a faint, gasoline-like odor. An odor threshold
concentration of 1.5 ppm
v was reported by Nagata and Takeuchi (1990).
Uses
n-Hexane is a chief constituent of petroleumether, gasoline, and rubber solvent. It is usedas a solvent for adhesives, vegetable oils,and in organic analysis, and for denaturingalcohol.
Uses
Suitable for HPLC, spectrophotometry, environmental testing
Uses
Determining refractive index of minerals; filling for thermometers instead of mercury, usually with a blue or red dye; extraction solvent for oilseed processing.
Definition
ChEBI: An unbranched alkane containing six carbon atoms.
General Description
Clear colorless liquids with a petroleum-like odor. Flash points -9°F. Less dense than water and insoluble in water. Vapors heavier than air. Used as a solvent, paint thinner, and chemical reaction medium.
Air & Water Reactions
Highly flammable. Insoluble in water.
Reactivity Profile
HEXANE may be sensitive to light. Hexane may also be sensitive to prolonged exposure to heat. Hexane can react vigorously with oxidizing materials. This would include compounds such as liquid chlorine, concentrated O2, sodium hypochlorite and calcium hypochlorite. Hexane is also incompatible with dinitrogen tetraoxide. Hexane will attack some forms of plastics, rubber and coatings. .
Hazard
Flammable, dangerous fire risk.
Health Hazard
n-Hexane is a respiratory tract irritant andat high concentrations a narcotic. Its acutetoxicity is greater than that of n-pentane.Exposure to a concentration of 40,000 ppmfor an hour caused convulsions and death inmice. In humans a 10-minute exposure toabout 5000 ppm may produce hallucination,distorted vision, headache, dizziness, nausea,and irritation of eyes and throat. Chronicexposure to n-hexane may cause polyneuritis.
The metabolites of n-hexane injected inguinea pigs were reported as 2,5- hexanedioneand 5-hydroxy-2-hexanone, which arealso metabolites of methyl butyl ketone(DiVincenzo et al. 1976). Thus methyl butylketone and n- hexane should have similartoxicities. The neurotoxic metabolite, 2,5-hexanedione, however, is produced considerablyless in n-hexane. However, in the caseof hexane, the neurotoxic metabolite 2,5-hexanedione is produced to a much lesserextent. Continuous exposure to 250 ppmn-hexane produced neurotoxic effects in animals. Occupational exposure to 500 ppmmay cause polyneuropathy (ACGIH 1986).
Inhalation of n-hexane vapors have shownreproductive effects in rats and mice.
Flammability and Explosibility
Hexane is extremely flammable (NFPA rating = 3), and its vapor can travel a
considerable distance to an ignition source and "flash back." Hexane vapor forms
explosive mixtures with air at concentrations of 1.1 to 7.5 % (by volume).
Hydrocarbons of significantly higher molecular weight have correspondingly higher
vapor pressures and therefore present a reduced flammability hazard. Carbon
dioxide or dry chemical extinguishers should be used for hexane fires.
Chemical Reactivity
Reactivity with Water: No reaction; Reactivity with Common Materials: No reactions; Stability During Transport: Stable; Neutralizing Agents for Acids and Caustics: Not pertinent; Polymerization: Not pertinent; Inhibitor of Polymerization: Not pertinent.
Potential Exposure
n-Hexane is industrial chemical, emul sifier, in manufacture of plastics, resins; as a solvent, par ticularly in the extraction of edible fats and oils; as a
laboratory reagent; and as the liquid in low temperature
thermometers. Technical and commercial grades consist of
45 85% hexane, as well as cyclopentanes, isohexane, and
1% to 6% benzene.
First aid
If this chemical gets into the eyes, remove anycontact lenses at once andirrigate immediately for at least15 min, occasionally lifting upper and lower lids. Seek med-ical attention immediately. If this chemical contacts theskin, remove contaminated clothing and wash immediatelywith soap and water. Seek medical attention immediately. Ifthis chemical has been inhaled, remove from exposure,begin rescue breathing (using universal precautions, includ-ing resuscitation mask) if breathing has stopped and CPR ifheart action has stopped. Transfer promptly to a medicalfacility. When this chemical has been swallowed, get medi-cal attention. Do not induce vomiting.
Carcinogenicity
Male rabbits exposed to
3000 ppm hexane (8 h/day, 6 days/week for 24 weeks)
developed papillary proliferation of nonciliated bronchiolar
cells. No tumors were found in mice painted with
hexane and croton oil as cocarcinogen, presumably for the
lifetime of each animal. Hexane is inactive as a tumorpromoting
agent.
Source
In diesel engine exhaust at a concentration of 1.2% of emitted hydrocarbons (quoted,
Verschueren, 1983).
A constituent in gasoline. Harley et al. (2000) analyzed the headspace vapors of three grades of
unleaded gasoline where ethanol was added to replace methyl tert-butyl ether. The gasoline vapor
concentrations of hexane in the headspace were 4.31 wt % for regular grade, 3.74.8 wt % for midgrade,
and 2.3 wt % for premium grade.
Gas-phase tailpipe emission rates from gasoline-powered automobiles with and without
catalytic converters were 1.82 and 268 mg/km, respectively (Schauer et al., 2002).
Environmental Fate
Biological. Hexane may biodegrade in two ways. The first is the formation of hexyl hydroperoxide,
which decomposes to 1-hexanol followed by oxidation to hexanoic acid. The other
pathway involves dehydrogenation to 1-hexene, which may react with water giving 1-hexanol
(Dugan, 1972). Microorganisms can oxidize alkanes under aerobic conditions (Singer and
Finnerty, 1984). The most common degradative pathway involves the oxidation of the terminal
methyl group forming 1-hexanol. The alcohol may undergo a series of dehydrogenation steps
forming a hexanal followed by oxidation to form hexanoic acid. The fatty acid may then be
metabolized by β-oxidation to form the mineralization products, carbon dioxide and water (Singer
and Finnerty, 1984).
Photolytic. An aqueous solution irradiated by UV light at 50 °C for 1 d resulted in a 50.51%
yield of carbon dioxide (Knoevenagel and Himmelreich, 1976). Synthetic air containing gaseous
nitrous acid and exposed to artificial sunlight (λ = 300–450 nm) photooxidized hexane into two
isomers of hexyl nitrate and peroxyacetal nitrate (Cox et al., 1980).
Chemical/Physical. Complete combustion in air yields carbon dioxide and water vapor.
storage
hexane should be used only in areas free of ignition sources, and
quantities greater than 1 liter should be stored in tightly sealed metal containers in
areas separate from oxidizers.
Shipping
UN1208 Hexanes, Hazard Class: 3; Labels:
3-Flammable liquid.
Purification Methods
Purify as for n-heptane. Modifications include the use of chlorosulfonic acid or 35% fuming H2SO4 instead of conc H2SO4 in washing the alkane, and final drying and distilling from sodium hydride. Unsaturated impurities can be removed by shaking the hexane with nitrating acid (58% H2SO4, 25% conc HNO3, 17% water, or 50% HNO3, 50% H2SO4), then washing the hydrocarbon layer with conc H2SO4, followed by H2O, drying, and distilling over sodium or n-butyl lithium. It can also be purified by distillation under nitrogen from sodium benzophenone ketyl solubilised with tetraglyme. Also purify it by passage through a silica gel column followed by distillation [Kajii et al. J Phys Chem 91 2791 1987]. It is a FLAMMABLE liquid and a possible nerve toxin. [Beilstein 1 IV 338.] Rapid purification: Distil, discarding the first forerun and stored over 4A molecular sieves.
Toxicity evaluation
Identification of 2,5-hexanedione as the major neurotoxic
metabolite of n-hexane proceeded rapidly after its discovery as
a urinary metabolite. 2,5-Hexanedione has been found to
produce a polyneuropathy indistinguishable from n-hexane.
2,5-Hexanedione is many times more potent than n-hexane,
the parent compound, in causing neurotoxicity in experimental
animals. It appears that the neurotoxicity of 2,5-hexanedione
resides in its γ-diketone structure since 2,3-, 2,4-hexanedione
and 2,6-heptanedione are not neurotoxic, while
2,5-heptanedione and 3,6-octanedione and other g-diketones
are neurotoxic.
Incompatibilities
May form explosive mixture with air.
Contact with strong oxidizers may cause fire and explo sions. Contact with dinitrogen tetraoxide may explode @
28℃.Attacks some plastics, rubber and coatings. May
accumulate static electrical charges, and may cause ignition
of its vapors.
Toxics Screening Level
The initial threshold screening level (ITSL) for n-hexane is 700 μg/m3 based on an annual averaging time.
Waste Disposal
Dissolve or mix the material
with a combustible solvent and burn in a chemical incinera tor equipped with an afterburner and scrubber. All federal,
state, and local environmental regulations must be
observed.
