|Molar mass||60.10 g·mol−1|
|Melting point||−126 °C; −195 °F; 147 K|
|Boiling point||97 to 98 °C; 206 to 208 °F; 370 to 371 K|
|Vapor pressure||1.99 kPa (at 20 °C)|
Refractive index (nD)
|Viscosity||1.959 mPa×s (at 25°C) |
|Dipole moment||1.68 D|
|143.96 J K−1 mol−1|
|192.8 J K−1 mol−1|
Std enthalpy of
|−302.79–−302.29 kJ mol−1|
Std enthalpy of
|−2.02156–−2.02106 MJ mol−1|
|GHS signal word||DANGER|
|H225, H318, H336|
|P210, P261, P280, P305+351+338|
|EU classification||F Xi|
|R-phrases||R11, R41, R67|
|S-phrases||(S2), S7, S16, S24, S26, S39|
|Flash point||22 °C (72 °F; 295 K)|
|371 °C (700 °F; 644 K)|
|Explosive limits||2.2% - 13.7%|
|US health exposure limits (NIOSH):|
|TWA 200 ppm (500 mg/m3)|
Except where noted otherwise, data is given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
|what is: / ?)(|
Propanol, technically known as 1-Propanol, is a primary alcohol with the formula CH3CH2CH2OH. This colorless liquid is also known as propan-1-ol, 1-propyl alcohol, n-propyl alcohol, and n-propanol. It is an isomer of isopropanol (2-propanol, isopropyl alcohol). It is formed naturally in small amounts during many fermentation processes and used as a solvent in the pharmaceutical industry mainly for resins and cellulose esters.
1-Propanol shows the normal reactions of a primary alcohol. Thus it can be converted to alkyl halides; for example red phosphorus and iodine produce n-propyl iodide in 80% yield, while PCl3 with catalytic ZnCl2 gives 1-chloropropane. Reaction with acetic acid in the presence of an H2SO4 catalyst under Fischer esterification conditions gives propyl acetate, while refluxing propanol overnight with formic acid alone can produce propyl formate in 65% yield. Oxidation of 1-propanol with Na2Cr2O7 and H2SO4 gives only a 36% yield of propionaldehyde, and therefore for this type of reaction higher yielding methods using PCC or the Swern oxidation are recommended. Oxidation with chromic acid yields propionic acid.
1-Propanol is manufactured by catalytic hydrogenation of propionaldehyde. The propionaldehyde is itself produced via the oxo process, by hydroformylation of ethylene using carbon monoxide and hydrogen in the presence of a catalyst such as cobalt octacarbonyl or a rhodium complex.
- H2C=CH2 + CO + H2 → CH3CH2CH=O
- CH3CH2CH=O + H2 → CH3CH2CH2OH
1-Propanol was discovered in 1853 by Chancel, who obtained it by fractional distillation of fusel oil. Indeed 1-propanol is a major constituent of fusel oil, a by-product formed from certain amino acids when potatoes or grains are fermented to produce ethanol. This process is no longer a significant source of 1-propanol.
1-Propanol is thought to be similar to ethanol in its effects on human body, but 2-4 times more potent. Oral LD50 in rats is 1870 mg/kg (compared to 7060 mg/kg for ethanol). It is metabolized into propionic acid. Effects include alcoholic intoxication and high anion gap metabolic acidosis. As of 2011, only one case of lethal 1-propanol poisoning was reported.
Although this method is rare, it does indeed exist. Propanol might be much more convenient than ethanol for inhalation because of its potency with nebulizers.
Propanol as fuel
1-propanol has high octane numbers and it is suitable to engine fuel usage. However, production of propanol has been too expensive to be a common fuel. The Research octane number (RON) of propanol is 118 and Anti-Knock Index (AKI) is 108.
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- "NIOSH Pocket Guide to Chemical Hazards #0533". National Institute for Occupational Safety and Health (NIOSH).
- Anthony J. Papa "Propanols" in Ullmann’s Encyclopedia of Industrial Chemistry 2011, Wiley-VCH, Weinheim. doi:10.1002/14356007.a22_173.pub2
- "N-PROPANOL Health-Base Assessment and Recommendation for HEAC".
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