iso-octane

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iso-octane

A paraffin hydrocarbon fuel, defined as 2,2,4-trimethylpentane, which is used as a standard in the rating of fuels. This knock quality of fuel is expressed as a percentage by volume of iso-octane in a mixture with normal heptane that has the same knocking characteristics as the fuel under question. Fuel with an 87 octane rating is equivalent to a mixture of 87% iso-octane and 13% heptane.
References in periodicals archive ?
The supernatant that contained the methyl esters of fatty acids (FAMEs) was collected in a new tube, evaporated under N2 at 40[degrees]C, and redissolved in 1 mL of 2,2,4-trimethylpentane. The samples were analysed by using a GC (7890 A; Agilent Technologies, Santa Clara, CA, USA) with a triple-axis mass spectrometric (MS) detector in the electron impact mode (5975 C; Agilent Technologies) and equipped with a J&W DB-wax column (30 m x 0.250 mm x 0.25 [micro]m).
Correlation analysis showed that some compounds derived from smoking (especially, pyridine, furfural, 2-methyl-2-cyclopenten-1-one, 2,3-dimethyl-2-cyclopenten-1-one, and guaiacol) were positively correlated with the intensity of cured meat odour and flavour and negatively with the intensity of dried meat odour and flavour, while 2,2,4-trimethylpentane had a positive effect on the intensity of dried meat odour and flavour.
In conclusion, based on the results of this study, it can be stated that dominant compounds in dry-cured loins were: aromatic hydrocarbon (toluene); alkanes (hexane, heptane, and 2,2,4-trimethylpentane); aldehyde (hexanal); alcohol (2-furanmethanol); ketone (3-hydroxy-2-butanone); phenol (guaiacol); and terpenes (eucalyptol, cymene, y-terpinen, and limonene).
Rodriguez-Alvarez, "Viscosities, densities, surface tensions, and refractive indexes of 2,2,4-trimethylpentane + cyclohexane + decane ternary liquid systems at 298.15 K," Journal of Chemical and Engineering Data, vol.
Viscosity, Density, Surface Tension and Refractive Index of Cyclohexane + 2,2,4-Trimethylpentane Binary Liquid Systems from 25[degrees]C to 50[degrees]C," J.
[28] Certificate of Analysis, SRM 2262, Chlorinated Biphenyl Congeners in 2,2,4-Trimethylpentane (Nominal Concentration 2 microgram/milliliter), Certificate of Analysis, National Institute of Standards and Technology, Gaithersburg, MD (1995), www.nist.gov.
G., "Density and Viscosity Measurements of 2,2,4-Trimethylpentane (Isooctane) from 198K to 348K and up to 100 MPa," Journal of Chemical Engineering Data, 41(6), pp.
Pollutant category Pollutants Inert (nonaromatic, Cyclopentane, methylcyclopentane, nonalkane) methylcyclohexane, sulfur, EC, CO, N[O.sub.2] Polar (nonaldehyde) Acetic acid, 2-butanone, organic carbon Aromatic Benzene, toluene, ethylbenzene, m-xylene and p-xylene, o-xylene, n-propylbenzene, p-ethyltoluene, m-ethyltoluene, 1,3,5-trimethylbenzene, 1,2,4-trimethylbenzene and sec-butylbenzene Aldehyde Benzaldehyde, heptanal, hexanal, octanal Alkane 2,2,4-Trimethylpentane, 2,2-dimethylbutane, 2,3,4-trimethylpentane, 2,3-dimethylbutane.
For silicone, 2,2,4-trimethylpentane, iso-octene, and sabinene exhibit compatibility results similar to the baseline fuels, while the two aromatics show improved compatibility performance compared to the baseline fuels.
[[alpha].sub.2U]-globulin: measurement in rat kidney following administration of 2,2,4-trimethylpentane. Toxicology 41:161-168 (1986).
[15] Palette compound FGF-LLNL FGG-LLNL n-Butane 0 0 2-Methyl butane 0 0 2-Methyl hexane 0 0 Cyclopentane 14 14 1,2,4-T rimethy lbenzene 0 31 1-Hexene 14 9 n-Heptane 7 8 2,2,4-Trimethylpentane 53 38 Toluene 12 0 Table 6.
The tested fuel MON is obtained when the occurrence of detonations is the same as with a blend of n-heptane and 2,2,4-trimethylpentane (iso-octane).