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m neopentane (2,2-dimethylpropane)
 
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| Watchedfields = changed
| Watchedfields = changed
| verifiedrevid = 464398176
| verifiedrevid = 464398176
| ImageFile = Isopentane-2D-skeletal.png
| ImageFile = Isopentane-2D-skeletal.svg
| ImageFile_Ref = {{chemboximage|correct|??}}
| ImageFile_Ref = {{chemboximage|correct|??}}
| ImageSize = 100
| ImageSize = 100
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| ImageSize2 = 100
| ImageSize2 = 100
| ImageName2 = Ball and stick model of isopentane
| ImageName2 = Ball and stick model of isopentane
| PIN = 2-Methylbutane<ref name="IUPAC2013_652">{{cite book | title = Nomenclature of Organic Chemistry : IUPAC Recommendations and Preferred Names 2013 (Blue Book) | publisher = [[Royal Society of Chemistry|The Royal Society of Chemistry]] | date = 2014 | location = Cambridge | page = 652 | doi = 10.1039/9781849733069-FP001 | isbn = 978-0-85404-182-4 | quote = The names ‘isobutane’, ‘isopentane’ and ‘neopentane’ are no longer recommended.}}</ref>
| IUPACName = 2-Methylbutane<ref>{{Cite web|title=isopentane - Compound Summary|url=http://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=6556&loc=ec_rcs#x291|work=PubChem Compound|publisher=National Center for Biotechnology Information|accessdate=5 March 2012|location=USA|date=16 September 2004|at=Identification and Related Records}}</ref>
| OtherNames = Isopentane
|Section1={{Chembox Identifiers
|Section1={{Chembox Identifiers
| CASNo = 78-78-4
| CASNo = 78-78-4
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}}
}}
|Section2={{Chembox Properties
|Section2={{Chembox Properties
| C = 5
| C=5 | H=12
| H = 12
| Appearance = Colorless liquid
| Appearance = Colorless liquid
| Odor = Odorless
| Odor = Gasoline-like
| Density = 616 mg mL<sup>−1</sup><ref name="Wei">James Wei (1999), ''Molecular Symmetry, Rotational Entropy, and Elevated Melting Points''. Ind. Eng. Chem. Res., volume 38 issue 12, pp. 5019–5027 {{doi|10.1021/ie990588m}}</ref>
| Density = 616 mg mL<sup>−1</sup><ref name="Wei">James Wei (1999), ''Molecular Symmetry, Rotational Entropy, and Elevated Melting Points''. Ind. Eng. Chem. Res., volume 38 issue 12, pp. 5019–5027 {{doi|10.1021/ie990588m}}</ref>
| BoilingPtK = 300.9 to 301.3
| BoilingPtK = 300.9 to 301.3
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| LambdaMax = 192 nm
| LambdaMax = 192 nm
| RefractIndex = 1.354
| RefractIndex = 1.354
| Viscosity = 0.214 cP (at 20&nbsp;°C)
}}
}}
|Section4={{Chembox Thermochemistry
|Section4={{Chembox Thermochemistry
| DeltaHf = −179.1–−177.3 kJ mol<sup>−1</sup>
| DeltaHf = −179.1–−177.3 kJ mol<sup>−1</sup>
| DeltaHc = −3.5052–−3.5036 MJ mol<sup>−1</sup>
| DeltaHc = ~ 3.3 MJ mol<sup>−1</sup>, 19,664 Btu/lb
| Entropy = 260.41 J K<sup>−1</sup> mol<sup>−1</sup>
| Entropy = 260.41 J K<sup>−1</sup> mol<sup>−1</sup>
| HeatCapacity = 164.85 J K<sup>−1</sup> mol<sup>−1</sup>
| HeatCapacity = 164.85 J K<sup>−1</sup> mol<sup>−1</sup>
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| GHSPictograms = {{GHS flame}} {{GHS exclamation mark}} {{GHS health hazard}} {{GHS environment}}
| GHSPictograms = {{GHS flame}} {{GHS exclamation mark}} {{GHS health hazard}} {{GHS environment}}
| GHSSignalWord = '''DANGER'''
| GHSSignalWord = '''DANGER'''
| HPhrases = {{H-phrases|224|304|336|411}}
| HPhrases = {{H-phrases|224|301|302|305|336|411}}
| PPhrases = {{P-phrases|210|261|273|301+310|331}}
| PPhrases = {{P-phrases|210|261|273|301+310|331}}
| EUIndex = 601-006-00-1
| EUClass = {{Hazchem F+}} {{Hazchem Xn}} {{Hazchem N}}
| NFPA-H = 1
| NFPA-H = 1
| NFPA-F = 4
| NFPA-F = 4
| NFPA-R = 0
| NFPA-R = 0
| RPhrases = {{R12}}, {{R51/53}}, {{R65}}, {{R66}}, {{R67}}
| SPhrases = {{S2}}, {{S16}}, {{S29}}, {{S33}}
| FlashPtC = −51
| FlashPtC = −51
| AutoignitionPtC = 420
| AutoignitionPtC = 420
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}}
}}
}}
}}
'''Isopentane''', also called '''methylbutane''' or '''2-methylbutane''', is a branched-chain saturated [[hydrocarbon]] (an [[alkane]]) with five [[carbon]] atoms, with formula {{chem|C|5|H|12}} or {{chem|CH(CH|3|)|2|(C|2|H|5|)}}.
'''Isopentane''', [[carbon|C<sub>5</sub>]][[hydrogen|H<sub>12</sub>]], also called '''methylbutane''' or '''2-methylbutane''', is a branched-chain [[alkane]] with five [[carbon]] atoms . Isopentane is an extremely [[Volatility (chemistry)|volatile]] and extremely [[flammable]] liquid at room [[temperature]] and [[pressure]]. The [[normal boiling point]] is just a few degrees above room temperature and isopentane will readily boil and evaporate away on a warm day. Isopentane is commonly used in conjunction with [[liquid nitrogen]] to achieve a liquid bath temperature of −160&nbsp;°C. It is 1% or less of natural gas.<ref>Georg Hammer, Torsten Lübcke, Roland Kettner, Mark R. Pillarella, Herta Recknagel, Axel Commichau, Hans-Joachim Neumann and Barbara Paczynska-Lahme "Natural Gas" in Ullmann's Encyclopedia of Industrial Chemistry 2006, Wiley-VCH, Weinheim. {{DOI|10.1002/14356007.a17_073.pub2}}</ref>


⚫
Isopentane is a [[Volatility (chemistry)|volatile]] and [[flammable]] liquid. It is one of three [[structural isomerism|structural isomers]] with the [[molecular formula]] C<sub>5</sub>H<sub>12</sub>, the others being [[pentane]] (''n''-pentane) and [[neopentane]] (2,2-dimethylpropane).
⚫
==Nomenclature==
Isopentane is the name recommended by the [[International Union of Pure and Applied Chemistry]] (IUPAC).<ref>{{cite book | author=Panico, R.; & Powell, W. H. (Eds.) | title=A Guide to IUPAC Nomenclature of Organic Compounds 1993 | location=Oxford | publisher=Blackwell Science | year=1994 | isbn = 0-632-03488-2 | url = http://www.acdlabs.com/iupac/nomenclature/93/r93_679.htm}}</ref> An '''isopentyl''' group is a subset of the generic pentyl group. It has the chemical structure -CH<sub>2</sub>CH<sub>2</sub>CH(CH<sub>3</sub>)<sub>2</sub>.


Isopentane is commonly used in conjunction with [[liquid nitrogen]] to achieve a liquid bath temperature of −160&nbsp;°C. [[Natural gas]] typically contains 1% or less isopentane,<ref>Georg Hammer, Torsten Lübcke, Roland Kettner, Mark R. Pillarella, Herta Recknagel, Axel Commichau, Hans-Joachim Neumann and Barbara Paczynska-Lahme "Natural Gas" in Ullmann's Encyclopedia of Industrial Chemistry 2006, Wiley-VCH, Weinheim. {{doi|10.1002/14356007.a17_073.pub2}}</ref> but it is a significant component of [[natural gasoline]].<ref name=aver1958>Ivan F. Avery, L. V. Harvey (1958): ''[https://books.google.com/books?id=sC2JHAYfJb0C&pg=PA6 Natural-gasoline and Cycling Plants in the United States]'', Information circular, U.S. Department of the Interior, Bureau of Mines. 12 pages.</ref>
==Isomers==

⚫
Isopentane is one of three [[structural isomerism|structural isomers]] with the [[molecular formula]] C<sub>5</sub>H<sub>12</sub>, the others being [[pentane]] (''n''-pentane) and [[neopentane]] (dimethyl propane).
⚫
==Nomenclature==
The traditional name isopentane was still retained in the 1993 [[International Union of Pure and Applied Chemistry|IUPAC]] recommendations,<ref>[http://www.acdlabs.com/iupac/nomenclature/93/r93_679.htm Table 19(a) Acyclic and monocyclic hydrocarbons. Parent hydrocarbons]</ref><ref name="panico">{{cite book | editor=Panico, R. | editor2= Powell, W. H. | name-list-style= amp | title=A Guide to IUPAC Nomenclature of Organic Compounds 1993 | location=Oxford | publisher=Blackwell Science | year=1994 | isbn=0-632-03488-2}}
</ref> but is no longer recommended according to the 2013 recommendations.<ref name="IUPAC2013_652"/> The preferred IUPAC name is the systematic name 2-methylbutane. An '''isopentyl''' group is a subset of the generic pentyl group. It has the chemical structure -CH<sub>3</sub>CH<sub>2</sub>CH(CH<sub>3</sub>)<sub>2</sub>.


==Uses==
==Uses==
Isopentane is used in a closed loop in geothermal power production to drive turbines.<ref>
Isopentane is used in a closed loop in geothermal power production to drive turbines.<ref>Byproduct Isopentane also used in some of the LPG plant to run the boiler and generate the power.
⚫
[http://hsorka.is/english/HSProduction/Svartsengi/OrkuverIV.aspx HS Orka HF Energy Plant IV] {{Webarchive|url=https://web.archive.org/web/20141018154915/http://hsorka.is/english/HSProduction/Svartsengi/OrkuverIV.aspx |date=2014-10-18 }}</ref>
Byproduct Isopentane also used in some of the LPG plant to run the boiler and generate the power.
⚫
[http://hsorka.is/english/HSProduction/Svartsengi/OrkuverIV.aspx HS Orka HF Energy Plant IV]</ref>


Isopentane is used, in conjunction with [[dry ice]] or [[liquid nitrogen]], to freeze tissues for [[cryosection|cryosectioning]] in [[histology]]<ref>Freezing Tissues for Cryosectioning [http://www.uab.edu/research/administration/offices/ARP/ComparativePathology/Pathology/Histopathology/TissueSubmission/Pages/Freezing-Tissues-for-Cryosectioning.aspx]</ref>.
Isopentane is used, in conjunction with [[dry ice]] or liquid nitrogen, to freeze [[tissue (biology)|tissues]] for [[cryosection]]ing in [[histology]].
<ref>{{Cite web|url=http://www.uab.edu/research/administration/offices/ARP/ComparativePathology/Pathology/Histopathology/TissueSubmission/Pages/Freezing-Tissues-for-Cryosectioning.aspx|title = Animal Resources Program - the Office of the Vice President for Research &#124; UAB}}</ref>

Isopentane is a major component (sometimes 30% or more) of natural gasoline, an analog of common [[petroleum]]-derived [[gasoline]] that is condensed from natural gas.<ref name=aver1958/> It has a substantially higher [[octane rating]] (RON 93.7) than ''n''-pentane (61.7), and therefore there is interest in conversion from the latter.<ref name=wang2014>Sheng Wang, Ying Zhang, Mao-Gang He, Xiong Zheng, and Li-Bin Chen (2014): "Thermal Diffusivity and Speed of Sound of Saturated Pentane from Light Scattering". ''International Journal of Thermophysics'', volume 35, pages 1450–1464. {{doi|10.1007/s10765-014-1718-x}}</ref>


==References==
==References==
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{{Authority control}}
{{Authority control}}

[[Category:Alkanes]]
[[Category:Alkanes]]

Latest revision as of 13:57, 9 April 2024

Isopentane
Skeletal formula of isopentane
Skeletal formula of isopentane with all implicit carbons shown, and all explicit hydrogens added
Ball and stick model of isopentane
Names
Preferred IUPAC name
2-Methylbutane[1]
Other names
Isopentane
Identifiers
3D model (JSmol)
1730723
ChEBI
ChemSpider
ECHA InfoCard 100.001.039 Edit this at Wikidata
EC Number
  • 201-142-8
49318
MeSH isopentane
RTECS number
  • EK4430000
UNII
UN number 1265
  • InChI=1S/C5H12/c1-4-5(2)3/h5H,4H2,1-3H3 checkY
    Key: QWTDNUCVQCZILF-UHFFFAOYSA-N checkY
  • CCC(C)C
Properties
C5H12
Molar mass 72.151 g·mol−1
Appearance Colorless liquid
Odor Gasoline-like
Density 616 mg mL−1[2]
Melting point −161 to −159 °C; −258 to −254 °F; 112 to 114 K
Boiling point 27.8 to 28.2 °C; 81.9 to 82.7 °F; 300.9 to 301.3 K
Vapor pressure 76.992 kPa (at 20 °C)
7.2 nmol Pa−1 kg−1
UV-vis (λmax) 192 nm
1.354
Viscosity 0.214 cP (at 20 °C)
Thermochemistry
164.85 J K−1 mol−1
260.41 J K−1 mol−1
−179.1–−177.3 kJ mol−1
~ 3.3 MJ mol−1, 19,664 Btu/lb
Hazards
GHS labelling:
GHS02: Flammable GHS07: Exclamation mark GHS08: Health hazard GHS09: Environmental hazard
Danger
H224, H301, H302, H305, H336, H411
P210, P261, P273, P301+P310, P331
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineFlammability 4: Will rapidly or completely vaporize at normal atmospheric pressure and temperature, or is readily dispersed in air and will burn readily. Flash point below 23 °C (73 °F). E.g. propaneInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
1
4
0
Flash point −51 °C (−60 °F; 222 K)
420 °C (788 °F; 693 K)
Explosive limits 1.4–8.3%
Related compounds
Related alkanes
Related compounds
 2-Ethyl-1-butanol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)

Isopentane, also called methylbutane or 2-methylbutane, is a branched-chain saturated hydrocarbon (an alkane) with five carbon atoms, with formula C
5H
12 or CH(CH
3)
2(C
2H
5).

Isopentane is a volatile and flammable liquid. It is one of three structural isomers with the molecular formula C5H12, the others being pentane (n-pentane) and neopentane (2,2-dimethylpropane).

Isopentane is commonly used in conjunction with liquid nitrogen to achieve a liquid bath temperature of −160 °C. Natural gas typically contains 1% or less isopentane,[3] but it is a significant component of natural gasoline.[4]

Nomenclature

[edit]

The traditional name isopentane was still retained in the 1993 IUPAC recommendations,[5][6] but is no longer recommended according to the 2013 recommendations.[1] The preferred IUPAC name is the systematic name 2-methylbutane. An isopentyl group is a subset of the generic pentyl group. It has the chemical structure -CH3CH2CH(CH3)2.

Uses

[edit]

Isopentane is used in a closed loop in geothermal power production to drive turbines.[7]

Isopentane is used, in conjunction with dry ice or liquid nitrogen, to freeze tissues for cryosectioning in histology. [8]

Isopentane is a major component (sometimes 30% or more) of natural gasoline, an analog of common petroleum-derived gasoline that is condensed from natural gas.[4] It has a substantially higher octane rating (RON 93.7) than n-pentane (61.7), and therefore there is interest in conversion from the latter.[9]

References

[edit]
  1. ^ a b Nomenclature of Organic Chemistry : IUPAC Recommendations and Preferred Names 2013 (Blue Book). Cambridge: The Royal Society of Chemistry. 2014. p. 652. doi:10.1039/9781849733069-FP001. ISBN 978-0-85404-182-4. The names 'isobutane', 'isopentane' and 'neopentane' are no longer recommended.
  2. ^ James Wei (1999), Molecular Symmetry, Rotational Entropy, and Elevated Melting Points. Ind. Eng. Chem. Res., volume 38 issue 12, pp. 5019–5027 doi:10.1021/ie990588m
  3. ^ Georg Hammer, Torsten Lübcke, Roland Kettner, Mark R. Pillarella, Herta Recknagel, Axel Commichau, Hans-Joachim Neumann and Barbara Paczynska-Lahme "Natural Gas" in Ullmann's Encyclopedia of Industrial Chemistry 2006, Wiley-VCH, Weinheim. doi:10.1002/14356007.a17_073.pub2
  4. ^ a b Ivan F. Avery, L. V. Harvey (1958): Natural-gasoline and Cycling Plants in the United States, Information circular, U.S. Department of the Interior, Bureau of Mines. 12 pages.
  5. ^ Table 19(a) Acyclic and monocyclic hydrocarbons. Parent hydrocarbons
  6. ^ Panico, R. & Powell, W. H., eds. (1994). A Guide to IUPAC Nomenclature of Organic Compounds 1993. Oxford: Blackwell Science. ISBN 0-632-03488-2.
  7. ^ Byproduct Isopentane also used in some of the LPG plant to run the boiler and generate the power. HS Orka HF Energy Plant IV Archived 2014-10-18 at the Wayback Machine
  8. ^ "Animal Resources Program - the Office of the Vice President for Research | UAB".
  9. ^ Sheng Wang, Ying Zhang, Mao-Gang He, Xiong Zheng, and Li-Bin Chen (2014): "Thermal Diffusivity and Speed of Sound of Saturated Pentane from Light Scattering". International Journal of Thermophysics, volume 35, pages 1450–1464. doi:10.1007/s10765-014-1718-x
[edit]
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