Viscosities of heavy oils-in-toluene and partially deasphalted heavyoils-in-heptol in the study of asphaltenes self-interactions

C. W. Angle, L. Lue, T. Dabros, H. A. Hamza

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Abstract

Interparticle interactions of the soluble asphaltenes in partially deasphalted heavy oils in toluene-heptane (heptol) mixtures are compared to those of several heavy oils diluted in toluene only. Viscosity-volume fraction (eta-Phi) relationships for the heavy oils and bitumen in toluene were almost identical. However, the asphaltenes in toluene associated and scaled differently from its source oil. Four classical viscosity models were used to describe the data, and scaling was interpreted on the basis of asphaltenes association, as in macromolecular interactions, The Pal-Rhodes model showed deviation from sphericity with solvation constants for heavy oils in toluene and C-5 asphaltenes in toluene, at 1.4-1.6 and 3.7, respectively. The Krieger-Dougherty (KH) model indicated high interparticle interaction factors, and maximum packing factors of similar to 1 suggested polydispersity. Neither models fit the data for deasphalted oils. The Leighton-Acrivos model showed that W the maximum packing fraction (Phi(max)) for all oils was similar, (ii) the asphaltenes alone in toluene had the highest self-associations, and (iii) the deasphalted oils showed Phi(max) values close to the theoretical values (0.58). From the Einstein equations, intrinsic viscosities [eta] of deasphalted oils in heptol gave aspect ratios (length to radius, L/R) of the asphaltenes at 10 (i.e., rodlike molecules). The K-H model gave [eta] of similar to 4 and L/R approximate to 3.5 for heavy oils in toluene; however, for asphaltenes in toluene, the model gave [eta] approximate to 10.6 and L/R approximate to 5.8 (i.e., less-rodlike molecules).
LanguageEnglish
Pages2014-2020
Number of pages7
JournalEnergy and Fuels
Volume19
DOIs
Publication statusPublished - Sep 2005

Fingerprint

Asphaltenes
Toluene
Crude oil
Viscosity
Oils
asphalt
Heptanes
Molecules
Solvation
Polydispersity
Heptane
Aspect ratio
Volume fraction
Association reactions

Keywords

  • viscosities
  • heavy oils
  • toluene

Cite this

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title = "Viscosities of heavy oils-in-toluene and partially deasphalted heavyoils-in-heptol in the study of asphaltenes self-interactions",
abstract = "Interparticle interactions of the soluble asphaltenes in partially deasphalted heavy oils in toluene-heptane (heptol) mixtures are compared to those of several heavy oils diluted in toluene only. Viscosity-volume fraction (eta-Phi) relationships for the heavy oils and bitumen in toluene were almost identical. However, the asphaltenes in toluene associated and scaled differently from its source oil. Four classical viscosity models were used to describe the data, and scaling was interpreted on the basis of asphaltenes association, as in macromolecular interactions, The Pal-Rhodes model showed deviation from sphericity with solvation constants for heavy oils in toluene and C-5 asphaltenes in toluene, at 1.4-1.6 and 3.7, respectively. The Krieger-Dougherty (KH) model indicated high interparticle interaction factors, and maximum packing factors of similar to 1 suggested polydispersity. Neither models fit the data for deasphalted oils. The Leighton-Acrivos model showed that W the maximum packing fraction (Phi(max)) for all oils was similar, (ii) the asphaltenes alone in toluene had the highest self-associations, and (iii) the deasphalted oils showed Phi(max) values close to the theoretical values (0.58). From the Einstein equations, intrinsic viscosities [eta] of deasphalted oils in heptol gave aspect ratios (length to radius, L/R) of the asphaltenes at 10 (i.e., rodlike molecules). The K-H model gave [eta] of similar to 4 and L/R approximate to 3.5 for heavy oils in toluene; however, for asphaltenes in toluene, the model gave [eta] approximate to 10.6 and L/R approximate to 5.8 (i.e., less-rodlike molecules).",
keywords = "viscosities , heavy oils, toluene",
author = "Angle, {C. W.} and L. Lue and T. Dabros and Hamza, {H. A.}",
year = "2005",
month = "9",
doi = "10.1021/ef0500235",
language = "English",
volume = "19",
pages = "2014--2020",
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issn = "0887-0624",
publisher = "American Chemical Society",

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Viscosities of heavy oils-in-toluene and partially deasphalted heavyoils-in-heptol in the study of asphaltenes self-interactions. / Angle, C. W.; Lue, L.; Dabros, T.; Hamza, H. A.

In: Energy and Fuels, Vol. 19, 09.2005, p. 2014-2020.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Viscosities of heavy oils-in-toluene and partially deasphalted heavyoils-in-heptol in the study of asphaltenes self-interactions

AU - Angle, C. W.

AU - Lue, L.

AU - Dabros, T.

AU - Hamza, H. A.

PY - 2005/9

Y1 - 2005/9

N2 - Interparticle interactions of the soluble asphaltenes in partially deasphalted heavy oils in toluene-heptane (heptol) mixtures are compared to those of several heavy oils diluted in toluene only. Viscosity-volume fraction (eta-Phi) relationships for the heavy oils and bitumen in toluene were almost identical. However, the asphaltenes in toluene associated and scaled differently from its source oil. Four classical viscosity models were used to describe the data, and scaling was interpreted on the basis of asphaltenes association, as in macromolecular interactions, The Pal-Rhodes model showed deviation from sphericity with solvation constants for heavy oils in toluene and C-5 asphaltenes in toluene, at 1.4-1.6 and 3.7, respectively. The Krieger-Dougherty (KH) model indicated high interparticle interaction factors, and maximum packing factors of similar to 1 suggested polydispersity. Neither models fit the data for deasphalted oils. The Leighton-Acrivos model showed that W the maximum packing fraction (Phi(max)) for all oils was similar, (ii) the asphaltenes alone in toluene had the highest self-associations, and (iii) the deasphalted oils showed Phi(max) values close to the theoretical values (0.58). From the Einstein equations, intrinsic viscosities [eta] of deasphalted oils in heptol gave aspect ratios (length to radius, L/R) of the asphaltenes at 10 (i.e., rodlike molecules). The K-H model gave [eta] of similar to 4 and L/R approximate to 3.5 for heavy oils in toluene; however, for asphaltenes in toluene, the model gave [eta] approximate to 10.6 and L/R approximate to 5.8 (i.e., less-rodlike molecules).

AB - Interparticle interactions of the soluble asphaltenes in partially deasphalted heavy oils in toluene-heptane (heptol) mixtures are compared to those of several heavy oils diluted in toluene only. Viscosity-volume fraction (eta-Phi) relationships for the heavy oils and bitumen in toluene were almost identical. However, the asphaltenes in toluene associated and scaled differently from its source oil. Four classical viscosity models were used to describe the data, and scaling was interpreted on the basis of asphaltenes association, as in macromolecular interactions, The Pal-Rhodes model showed deviation from sphericity with solvation constants for heavy oils in toluene and C-5 asphaltenes in toluene, at 1.4-1.6 and 3.7, respectively. The Krieger-Dougherty (KH) model indicated high interparticle interaction factors, and maximum packing factors of similar to 1 suggested polydispersity. Neither models fit the data for deasphalted oils. The Leighton-Acrivos model showed that W the maximum packing fraction (Phi(max)) for all oils was similar, (ii) the asphaltenes alone in toluene had the highest self-associations, and (iii) the deasphalted oils showed Phi(max) values close to the theoretical values (0.58). From the Einstein equations, intrinsic viscosities [eta] of deasphalted oils in heptol gave aspect ratios (length to radius, L/R) of the asphaltenes at 10 (i.e., rodlike molecules). The K-H model gave [eta] of similar to 4 and L/R approximate to 3.5 for heavy oils in toluene; however, for asphaltenes in toluene, the model gave [eta] approximate to 10.6 and L/R approximate to 5.8 (i.e., less-rodlike molecules).

KW - viscosities

KW - heavy oils

KW - toluene

UR - http://pubs.acs.org/doi/abs/10.1021/ef0500235

U2 - 10.1021/ef0500235

DO - 10.1021/ef0500235

M3 - Article

VL - 19

SP - 2014

EP - 2020

JO - Energy and Fuels

T2 - Energy and Fuels

JF - Energy and Fuels

SN - 0887-0624

ER -