Asphaltene precipitation from heavy oil mixed with binary and ternary solvent blends

Published on Apr 20, 2021in Chemical Product and Process Modeling
· DOI :10.1515/CPPM-2020-0090
Javier A. Rivero-Sanchez1
Estimated H-index: 1
(U of C: University of Calgary),
F. Ramos-Pallares4
Estimated H-index: 4
(Lakehead University)
+ 1 AuthorsHarvey W. Yarranton36
Estimated H-index: 36
(U of C: University of Calgary)
Source
Abstract
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#1F. Ramos-Pallares (U of C: University of Calgary)H-Index: 4
#2Harvey W. Yarranton (U of C: University of Calgary)H-Index: 36
The Modified Regular Solution (MRS) model is an activity coefficient approach previously developed to predict the onset and amount of asphaltene precipitation from n-paraffin diluted crude oils. The activity coefficients in this model are determined from an enthalpic contribution based on the Regular Solution theory and a Flory-Huggins (configurational) entropic contribution. The inputs are the molar volume and solubility parameter of the crude oil pseudo-components which are defined based on th...
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#1S. Rodriguez (U of C: University of Calgary)H-Index: 1
#2E. N. Baydak (U of C: University of Calgary)H-Index: 5
Last. Harvey W. Yarranton (U of C: University of Calgary)H-Index: 36
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Abstract The modified regular solution (MRS) model for asphaltene precipitation was extended to visbroken bitumen products based on data from an Athabasca bitumen that was thermally cracked in a lab-scale flow-through visbreaker at five different temperatures and residence times. The thermal conversion for each visbroken product was calculated based on SimDist data. The feed and each product were characterized into 5 pseudo-components (distillates, saturates, aromatics, resins, and asphaltenes) ...
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#1Y. A. Perez Claro (U of C: University of Calgary)H-Index: 1
#2F. F. Schoeggl (U of C: University of Calgary)H-Index: 10
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The phase behavior of bitumen and n-butane mixtures was investigated at temperatures from 20 to 230 °C and pressures from 2 to 10 MPa. The measurements included saturation pressures, compositions at the onset of the second liquid phase, and the compositions and masses of the light n-butane-rich and heavy “pitch” phases in the liquid–liquid region. The phase compositions were measured in terms of the n-butane, maltenes, and C5-asphaltenes (pentane insolubles) contents. The bitumen component yield...
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Abstract Solvent recovery from diluted bitumen and froth treatment tailings, produced during the bitumen recovery process for mined oil sands, requires an understanding of the thermodynamic equilibrium and kinetics of solvent dissolution in bitumen. Thermodynamic properties of solvent in bitumen having various asphaltene contents are needed in order to model and improve the solvent recovery process. In this work, the thermodynamic properties of light hydrocarbons in bitumen were investigated usi...
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#1Yechun Zhang (U of C: University of Calgary)
Abstract The cubic-plus-association equation of state was applied to model the phase behaviour of bitumen/n-alkane systems including saturation pressures, liquid-liquid boundaries, yields, and phase compositions. Yield is defined here as the mass of bitumen in the heavy phase divided by the mass of bitumen in the feed. To implement the model, the bitumen was divided into a set of pseudo-components based on a distillation assay and either the n-pentane insoluble content of the oil (CPA-C5 approac...
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#1Yuming Xu (NRCan: Natural Resources Canada)H-Index: 4
In surface-mined oil sands operations, bitumen is extracted from oil sand ore using a warm-water extraction process that produces bitumen froth typically containing 60 wt % bitumen, 30 wt % water, and 10 wt % mineral solids. The bitumen froth is then cleaned in a froth treatment process, in which the froth is diluted with solvent to enhance the separation of bitumen from water and solids. In paraffinic solvent froth treatment, light alkanes, such as pentane or hexane, are used as solvent, leadin...
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Cubic equations of state (CEoS), such as the advanced Peng–Robinson (APR) EoS, are convenient for use in commercial simulators and have successfully fit saturation pressures and asphaltene onset points for bitumen–solvent systems using simple quadratic mixing rules. However, this approach does not accurately predict asphaltene precipitation yields. In this study, the APR EoS with several sets of asymmetric mixing rules is evaluated against saturation pressure and asphaltene yield data for n-pent...
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#1K. A. Johnston (U of C: University of Calgary)H-Index: 3
#2F. F. Schoeggl (U of C: University of Calgary)H-Index: 10
Last. Harvey W. Yarranton (U of C: University of Calgary)H-Index: 36
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Abstract The phase boundaries for mixtures of n -pentane and bitumen were determined at temperatures from 21 to 280 °C and pressures up to 14 MPa. Both vapor-liquid equilibria and liquid-liquid (solvent-rich and asphaltene-rich phases) equilibria were observed for these mixtures. Saturation pressures (vapor-liquid boundary) were measured using both a PVT cell and a blind cell apparatus at temperatures ranging from 90 to 280 °C. The compositions at which a separate asphaltene-rich heavy phase is ...
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Cited By1
Newest
#1J. A. Rivero-Sanchez (U of C: University of Calgary)
#2F. Ramos-Pallares (Lakehead University)H-Index: 4
Last. Harvey W. Yarranton (U of C: University of Calgary)H-Index: 36
view all 4 authors...
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