Chemistry:1-Propanol
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| Names | |
|---|---|
| Pronunciation | ˈprəʊpən.wən.ɒl |
| Preferred IUPAC name
Propan-1-ol[1] | |
Other names
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| Identifiers | |
3D model (JSmol)
|
|
| 3DMet | |
| 1098242 | |
| ChEBI | |
| ChEMBL | |
| ChemSpider | |
| DrugBank | |
| EC Number |
|
| 25616 | |
| KEGG | |
| MeSH | 1-Propanol |
PubChem CID
|
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| RTECS number |
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| UNII | |
| UN number | 1274 |
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| Properties | |
| C3H8O | |
| Molar mass | 60.096 g·mol−1 |
| Appearance | Colorless liquid |
| Odor | mild, alcohol-like[2] |
| Density | 0.803 g/mL |
| Melting point | −126 °C; −195 °F; 147 K |
| Boiling point | 97 to 98 °C; 206 to 208 °F; 370 to 371 K |
| miscible | |
| log P | 0.329 |
| Vapor pressure | 1.99 kPa (at 20 °C) |
| Acidity (pKa) | 16 |
| Basicity (pKb) | −2 |
| −45.176·10−6 cm3/mol | |
Refractive index (nD)
|
1.387 |
| Viscosity | 1.959 mPa·s (at 25 °C) [3] |
| 1.68 D | |
| Thermochemistry | |
Heat capacity (C)
|
143.96 J/(K·mol) |
Std molar
entropy (S |
192.8 J/(K·mol) |
Std enthalpy of
formation (ΔfH⦵298) |
−302.79…−302.29 kJ/mol |
Std enthalpy of
combustion (ΔcH⦵298) |
−2.02156…−2.02106 MJ/mol |
| Pharmacology | |
| 1=ATC code }} | D08AX03 (WHO) |
| Hazards | |
| Main hazards | Flammable liquid |
| GHS pictograms |  
|
| GHS Signal word | DANGER |
| H225, H302, H318, H336 | |
| P210, P261, P280, P305+351+338 | |
| NFPA 704 (fire diamond) | |
| Flash point | 22 °C (72 °F; 295 K) |
| 371 °C (700 °F; 644 K) | |
| Explosive limits | 2.2–13.7%[2] |
| Lethal dose or concentration (LD, LC): | |
LD50 (median dose)
|
2800 mg/kg (rabbit, oral) 1699 mg/kg (mouse, oral) 1870 mg/kg (rat, oral)[4] |
| NIOSH (US health exposure limits): | |
PEL (Permissible)
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TWA 200 ppm (500 mg/m3)[2] |
REL (Recommended)
|
TWA 200 ppm (500 mg/m3) ST 250 ppm (625 mg/m3) [skin][2] |
IDLH (Immediate danger)
|
800 ppm[2] |
| Related compounds | |
Related compounds
|
Propane Isopropyl alcohol Propanamine Ethanol Butanol |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
 verify (what is   ?)
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| Infobox references | |
1-Propanol (also propan-1-ol, propanol, n-propyl alcohol) is a primary alcohol with the formula CH
3CH
2CH
2OH and sometimes represented as PrOH or n-PrOH. It is a colourless liquid and an isomer of 2-propanol. 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, and, sometimes, as a disinfecting agent.
Chemical properties
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 PCl
3 with catalytic ZnCl
2 gives n-propyl chloride. Reaction with acetic acid in the presence of an H
2SO
4 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 Na
2Cr
2O
7 and H
2SO
4 gives 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.
Preparation
1-Propanol is manufactured by catalytic hydrogenation of propionaldehyde. Propionaldehyde is 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.[5]
- H
2C=CH
2 + CO + H
2 → CH
3CH
2CH=O
- CH
3CH
2CH=O + H
2 → CH
3CH
2CH
2OH
A traditional laboratory preparation of 1-propanol involves treating n-propyl iodide with moist Ag
2O.
Safety
1-Propanol is thought to be similar to ethanol in its effects on the human body, but 2–4 times more potent according to a study conducted on rabbits. Many toxicology studies find oral acute LD50 ranging from 1.9 g/kg to 6.5 g/kg (compared to 7.06 g/kg for ethanol). It is metabolized into propionic acid. Effects include alcoholic intoxication and high anion gap metabolic acidosis. As of 2011, one case of lethal poisoning was reported following oral ingestion of 500mL of 1-propanol.[6] Due to lack of long term data, the carcinogenicity of 1-propanol in human beings is unknown.
1-Propanol as fuel
1-Propanol has high octane number and is suitable for engine fuel usage. However, propanol is too expensive to use as a motor fuel. The research octane number (RON) of propanol is 118, and anti-knock index (AKI) is 108.[7]
References
- ↑ Nomenclature of Organic Chemistry: IUPAC Recommendations and Preferred Names 2013 (Blue Book). Cambridge: The Royal Society of Chemistry. 2014. p. 61. doi:10.1039/9781849733069. ISBN 9780854041824.
- ↑ 2.0 2.1 2.2 2.3 2.4 NIOSH Pocket Guide to Chemical Hazards. "#0533". National Institute for Occupational Safety and Health (NIOSH). https://www.cdc.gov/niosh/npg/npgd0533.html.
- ↑ "Volumetric, acoustic, and viscometric studies of molecular interactions in binary mixtures of dipropylene glycol dimethyl ether with 1-alkanols at 298.15 K". J. Chem. Thermodyn. 40 (5): 818–828. 2008. doi:10.1016/j.jct.2008.01.008.
- ↑ "n-Propyl alcohol". Immediately Dangerous to Life and Health Concentrations (IDLH). National Institute for Occupational Safety and Health (NIOSH). https://www.cdc.gov/niosh/idlh/71238.html.
- ↑ "Propanols". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. 2011. doi:10.1002/14356007.a22_173.pub2. ISBN 9783527303854.
- ↑ Unmack JL (2011). "N-PROPANOL Health-Base Assessment and Recommendation for HEAC". https://www.dir.ca.gov/dosh/doshreg/5155-Meetings/n-Propanol-Draft4-March-2-2011.pdf.
- ↑ "Bioalcohols". 2010. http://biofuel.org.uk/bioalcohols.html.
Further reading
- CRC Handbook of Chemistry and Physics (87th ed.). TF-CRC. 2006. ISBN 0849304873.
- The Merck Index: An Encyclopedia of Chemicals, Drugs, and Biologicals (14th ed.). Merck. 2006. ISBN 091191000X.
- Organic Chemistry. London: W. & R. Chambers. 1922. ISBN 0080223540.
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