Composition of Virgin, Thermal, and Catalytic Naphthas from Mid-continent Petroleum

Cady, W.E.; Marschner, Robert F.; Cropper, Wendell P.

doi:10.1021/ie50512a040

Cited by 15 publications

(11 citation statements)

References 6 publications

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“…Cady and co-workers measured distillation data for well-defined mixtures of actual components for which reliable physical properties are available. The distillations were performed at low pressure, and polar interactions in the mixture are negligible; hence, ideal solution behavior can be assumed without any significant loss of accuracy, , although more complex models could be used.…”

Section: Methodology Testsmentioning

confidence: 99%

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Oil Characterization from Simulation of Experimental Distillation Data

Satyro¹,

Yarranton²

2009

Energy Fuels

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The characterization of crude oil involves dividing the oil into pseudocomponents and allocating mole fractions, molar mass, specific gravity, average boiling point, and critical properties to each component. The characterization is typically based on distillation data reported in terms of true boiling points. Standard assay types such as the ASTM D86 or ASTM D1160 vacuum distillation do not provide well established saturated bubble temperatures and require empirical interconversion curves to convert the assay data into true boiling point (TBP) data. Recently developed assays such as the ASTM D5236 and Bruno’s new distillation assay methodology do provide well-defined saturated bubble temperatures that correspond to actual thermodynamic state points but lack an established interconversion method to a TBP, that is, a method to determine the TBP of the fluid based on the measured temperatures of the assay. In this work, a methodology is presented to determine pseudocomponent mole fractions that match the boiling point data from these new assays. The fluid is divided into pseudocomponents of different average boiling point, and the molar mass and other physical properties of each component are determined using established correlations. A simulation of the distillation is optimized to match the assay data by adjusting the mole fraction of each pseudocomponent. The characterization can also be constrained to match other data such as the bulk density and molar mass of the fluid. The proposed methodology is tested on naphtha and Alaska crude oil and then verified through three heavy oil case studies. The methodology is entirely general and can be applied to a compositional analysis from a distillation of any material.

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Section: Methodology Testsmentioning

confidence: 99%

“…Virgin naphtha TBP from Cady et al data (diamonds) and the TBP determined from the pure component data (solid line) compared with TBP determined from Bruno data using the proposed methodology (dotted line).…”

Section: Methodology Testsmentioning

confidence: 99%

Oil Characterization from Simulation of Experimental Distillation Data

Satyro¹,

Yarranton²

2009

Energy Fuels

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“…Doubly branched paraffins are present in small amounts and triply branched paraffins are absent or barely detectable (9,24,25). Thermal gasolines (8,10) contain very few highly branched paraffins; the normal paraffins and single methyl-branched paraffins are in about the same relative amounts as found in virgin naphthas. Catalytic gasolines (8,10,12,14,21,23) contain relatively low amounts (<15%) of normal paraffins, large amounts (50 to 75%) of single methyl-branched paraffin» and 15 to 30% of multibranched paraffins.…”

Section: Paraffin and Naphthene Distributionmentioning

confidence: 93%

Total Naphthenes in Gasoline by Refracivity Intercept

Wood¹,

Martin²

1956

Anal. Chem.

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“…Determination of the individual hydrocarbons in the lower-boiling fraction has heretofore required weeks or months of tedious separations by distillation and adsorption chromatography, followed by measurement of physical properties of the fractions (9,10,(14)(15)(16)(17). Infrared spectroscopy (1), mass spectrometry (2, 3), and a combination of Raman spectroscopy with dehydrogenation-hydrogenation techniques (11,18) have helped in analyzing the fractions, but have not appreciably reduced the over-all time of analysis. Previous experience has indicated that at least the lower-boiling compounds in crude oil should be easier to determine by gas chromatography.…”

Section: Crude óIl Has Been Extensivelymentioning

confidence: 99%