Heptane

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Related to N-heptane: acetone, toluene, N-hexane

heptane

[′hep‚tān]
(organic chemistry)
CH3(CH2)5CH3 A hydrocarbon; water-insoluble, flammable, colorless liquid boiling at 98°C; soluble in alcohol, chloroform, and ether; used as an anesthetic, solvent, and chemical intermediate, and in standard octane-rating tests.

Heptane

 

(n-heptane), the hydrocarbon C7H16, a colorless volatile liquid with a slight odor. Boiling point, 98.4° C; density, 0.6838 g/cm3 at 20° C; refractive index (nD20), 1.3876; heat of combustion, 1167.11 kilocalories per mole (25° C); explosion limits in air, 1.10-6.00 volume · percent; flash point, −17° C. Insoluble in water; soluble in ether and other organic solvents.

The dehydrocyclization of heptane to toluene is of great interest, playing an important part in catalytic reforming and the aromatization of petroleum products. Pure heptane can be prepared by the usual methods for synthesis of saturated hydrocarbons; it can also be isolated by fractionation of petroleum or synthetic gasoline. Heptane is used as a primary reference standard in determining the knock rating of carburetor fuels (the octane number of heptane is assumed to be zero). Among the structural isomers of heptane, 2,2,3-trimethylbutane (triptane) is of practical importance, being added to motor fuels.

References in periodicals archive ?
Above 6500 rpm the engine was not knock-limited for all fuels, except for pure n-heptane (with 2% two-stroke oil).
An organic solution consisting of n-heptane and thiophene was used as model fuel, and the inlet sulfur concentration was 200 mg [L.sup.-1].
where t represents the time, [tau] is the characteristic relaxation time which is directly related to the apparent diffusion coefficient [D.sub.app], q = (4[pi]n/[lambda]) sin ([theta]/2) is the wavevector, n is the solution refractive index which was assumed to be close to that of the continuous phase (n = 133 and n = 1.39 for water and n-heptane, respectively), and [beta], which is close to 1, is the coherence factor.
Historically, 2,2,4-trimethylpentane (also known as iso-octane) has been utilized as the surrogate for the iso-alkane group since the surrogate mixture of 2,2,4-trimethylpentane and n-heptane mimics gasoline combustion to a good degree of accuracy.
1, Methane; 2, ethane; 3, propane; 4, isobutane; 5, n-butane; 6, isopentane; 7, n-pentane; 8, methyl cyclopentane; 9, 2-methylpentane; 10, n-hexane; 11, methyl cyclohexane; 12, 2/3-methylhexane; 13, n-heptane; 14, benzene; 15, n-octane; 16, methylbenzene; 17, n-nonane; 18, [beta]-xylene.
In their computational study, including the neat PRF compounds iso-octane and n-heptane, kinetic and thermophysical effects on ignition delay times over conditions (600-1100 K, 9 and 60 atm) similar to this study were investigated.
Table 6 and 7 showed the activities of lipase and phospholipase enzymes in different solvents and results indicated that in n-heptane, both the enzymes showed their maximum activities.
A simplified reaction mechanism for n-heptane consisting of 22 chemical species in 18 reaction steps is applied [26] based on good agreement with experimental data obtained with this compact description in previous studies in constant-volume chambers [19, 20, 21] as well as engines [27, 28].
In this sense, DAO asphaltene content was determined by extraction using an excess amount of n-heptane according to a standard procedure having a measured deviation of [+ or -] 0.01% that was described in previous studies [31, 105].
A reduced mechanism for the diesel-syngas dual fuel was constructed by direct relation graph and sensitivity analysis with the detailed mechanism of n-heptane by the Lawrence Livermore Laboratory.
Activation time, s 60 component Composition, % mole Sample I 1,2-dimethylcyclopentane 0.108 n-heptane 7.10 Sample II cyclohexane 10.683 1-methyl-3-propylbenzene 12.093 1-butylbenzene 6.35 Activation time, s 300 component composition, % mole Sample I 1,2-dimethylcyclopentane 0.108 n-heptane 7.10 Sample II - - 1-methyl-3-propylbenzene 14.812 1-butylbenzene 6.45 Table 4: The dependence of the redistribution of natural gas components in hydrated phase starting from [P.sub.dissociation] of individual hydrates.
BP waste adsorbed thorium from SSAS at different operating conditions were segregated and classified according to it's contain of thorium and utilization from these remaining samples as a promoter for catalyst used in n-heptane cracking: zeolite type Y.