Separation of the three methyloctanes from midcontinent petroleum

The density, viscosity, and speed of sound were measured in this work for pure component branched alkanes (2-methyloctane, 4-methyloctane, 2methylnonane, 2-methyldecane, 3-methylundecane, 2-methylpentadecane, 7methylhexadecane, 3,6-dimethyloctane, and 3,5-dimethylheptane) commonly found in hydrotreated renewable fuels (HRFs) and for HRFs from tallow, camelina oil, and algae and waste cooking oil blended 50/50 with petroleum diesel. The density and viscosity were measured at temperatures from (283.15 to 373.15) K and ranged from (661 to 788) kg•m −3 for density and (0.261 to 5.36) mPa•s for viscosity. Speed of sound data were measured at temperatures from (283.15 to 323.15) K and spanned from (1081 to 1393) m•s −1 . The bulk modulus was calculated from the density and speed of sound data, and its values varied from (809 to 1527) MPa. All values increased as the carbon chain length on the alkane increased. All physical property values for the HRFs fell between those measured for individual pure component branched alkanes, providing property data for the development of surrogate mixtures for these renewable fuels.

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“…Density of 4-methyloctane: □, this study; ■, ref ; ◆, ref ; ◇, ref ; Δ, ref . Density of 2-methylpentadecane: ○, this study; ▲, ref .…”

Section: Resultsmentioning

confidence: 91%

Density, Viscosity, Speed of Sound, and Bulk Modulus of Methyl Alkanes, Dimethyl Alkanes, and Hydrotreated Renewable Fuels

2013

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“…This was found to be the case when a fraction of the petroleum composed of these two hydrocarbons was resolved into its constituents [12]. Similarly, use was made of the pressure-temperature relationships depicted in curves 8 and 9, in separating 3-methyloctane from the petroleum [3]. Special attention, however, is called to curves 4 and 5, which concern the present work.…”

Section: Separation Of Paraffin-naphthene Mixtures By Alternate; mentioning

confidence: 83%

“…The present investigation has resulted in the isolation of 1,2,4-trimethylcyclohexane and the partial separation of a nonane, probably 2,3-dimethylheptane, from the methyloctane fraction [3] of an Oklahoma petroleum. Until now, the presence in petroleum of the isononane (boiling point, 140.7 0 C) appears to have escaped detection.…”

Section: Introductionmentioning

confidence: 89%

“…To complete the removal of aromatic material, the immiscible portion was redistilled, and the large-volume fraction boiling between 140 0 and 145 0 C was treated with silica gel [3]. The residual oil consisting of paraffins and naphthenes was then distilled at a pressure of 215 mm Hg through a fractionating column, packed with jeweler's locket chain, having the equivalent of about 60 theoretical plates [5].…”

Section: Previous Fractionation Of the Petroleum Distillatementioning

confidence: 99%

“…The distillation separated the material into two main portions, each with a boiling range (at 215 mm Hg) of about 1 0 C. The larger, boiling between 101 0 C and 102.20 C (143 0 and 144.20 C at 760 mm Hg), contained the three methyloctanes. The isolation of these hydro('arbons from the petroleum has already been desoribed [3] . The other portion distilled chiefly between 98 0 and 99 0 C. The volumes and refractive indices of the combined fractions comprising this portion are given in figure 1.…”

Section: Previous Fractionation Of the Petroleum Distillatementioning

confidence: 99%

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Seperation of 1,2,4-trimethylcyclohexane and an isononane from a midcontinent petroleum

White¹,

Glasgow²

1939

J. RES. NATL. BUR. STAN.

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A fraction of Oklahoma petroleum boiling at 141° C, from which the aromatic hydrocarbons previously had been removed, was separated by distillation at 215 mm Hg into a fraction containing the bulk of a naphthene constituent and one enriched in paraffins. From the former, nearly pure 1,2,4-trimethylcyclohexane was isolated by crystallization from solution in liquid dichlorodifluoromethane. Continued distillation of the paraffinic fraction at normal pressure, alternated with distillation at 215 mm Hg, yielded a fraction containing 85 mole percent of an isononane, probably 2,3-dimethylheptane. The 1,2,4-trimethylcyclohexane constitutes about 0.1 percent, and the isononane about 0.05 percent of the original petroleum.Effective separation of a paraffin-naphthene mixture, constant-boiling at normal pressure, by distillation at a different pressure arises from the greater change in boiling point with pressure of the naphthene component. For hydrocarbons normally boiling near 140° C, the mean interval between boiling points at 760 mm Hg and 215 mm Hg is about 42° C for paraffins, and about 43.2° C for naphthenes. The boiling points at the two pressures were determined for six hydrocarbons, 2,6-dimethylheptane, a nonanaphthene (boiling at 136.7° C), 1,2,4-trimethylcyclohexane, 4-methyloctane, 3-methyloctane, and 2-methyloctane. The boiling points at these pressures for the "2,3-dimethylheptane" were estimated from values for an impure sample.The boiling point, freezing point, density, refractive index, and critical solution temperature in aniline have been determined for the 1,2,4-trimethylcyclohexane and the isononane. Comparison of the properties of the 1,2,4-trimethylcyclohexane with those reported for its synthetic stereoisomers indicates that the petroleum hydrocarbon is either lei., 2,r.n • .4ci.-trimethylcyclohexane or 1, • .,2'r.n" 4 tr• n.-trimethylcyclohexane.

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Pure Liquids: Extended References

Wohlfarth¹,

Wohlfarth²

Refractive Indices of Inorganic, Organometallic, and Organononmetallic Liquids, and Binary Liquid Mixtures

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Separation of the three methyloctanes from midcontinent petroleum

Cited by 9 publications

References 8 publications

Density, Viscosity, Speed of Sound, and Bulk Modulus of Methyl Alkanes, Dimethyl Alkanes, and Hydrotreated Renewable Fuels

Density, Viscosity, Speed of Sound, and Bulk Modulus of Methyl Alkanes, Dimethyl Alkanes, and Hydrotreated Renewable Fuels

Seperation of 1,2,4-trimethylcyclohexane and an isononane from a midcontinent petroleum

Pure Liquids: Extended References

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