Phase behavior of bitumen and n-pentane

Johnston, Kimberly; Schoeggl, F. F.; Satyro, Marco A.; Taylor, Shawn D.; Yarranton, Harvey W.

doi:10.1016/j.fluid.2017.03.001

Cited by 45 publications

(103 citation statements)

References 31 publications

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“…Both VL and LL phase boundaries were also observed for n-pentane and bitumen systems (Johnston et al, 2017a). The two liquid phases were a solvent/maltene-rich phase (L1) and an asphaltene-rich phase (L2).…”

Section: Bitumen/n-alkane Phase Regionsmentioning

confidence: 90%

“…Below its glass transition temperature, it appears as glassy particles (Rastegari et al, 2004) due to the kinetic inability of the droplets to coalesce (Sirota, 2005). Above its glass transition temperature, it appears as spherical droplets which coalesce forming a separate liquid phase (Agrawal et al, 2012;Johnston et al, 2017a). Hence, the amount, composition, and properties of asphaltene-rich phase can vary considerably with conditions.…”

Section: List Of Figures and Illustrationsmentioning

confidence: 99%

“…The phase behavior of mixtures of n-pentane and bitumen was recently mapped over conditions relevant to heavy oil processes (Johnston et al, 2017a). A modeling approach using the APR EoS with compositionally dependent mixing rules was also developed to model these data (Johnston, 2017).…”

Section: Objectivesmentioning

confidence: 99%

“…The remaining part of the NBP curve, the C5-asphaltenes (pentane insoluble asphaltenes), was characterized using a Gamma distribution function. This function has been demonstrated that represent the molecular weight distribution of asphaltene nano-aggregates for phase behavior modeling (Huang et al, 1991;Alboudwarej et al, 2003, Castellanos-Diaz et al, 2011, Agrawal et al, 2012, and Johnston et al, 2017a.…”

Section: Oil Characterization Based On Distillation Assaysmentioning

confidence: 99%

“…Note, the x-axis is the ABVB content in contrast with the other P-x diagrams in this thesis which are plotted versus the solvent content. ................... Figure 2.9 C5-asphaltene yield curve at 180°C for n-pentane diluted bitumen (Johnston et al, 2017a). Symbols are the experimental data and the shaded area is the onset (LL boundary).…”

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confidence: 99%

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The Phase Behavior of Heavy Oil and Propane Mixtures

Mancilla-Polanco

Schoeggl

Johnston

et al. 2017

Day 2 Thu, February 16, 2017

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The phase behavior of propane diluted bitumen was mapped from temperatures between 20 and 180°C and pressures up to 10 MPa. Both vapor-liquid (VL) and liquid-liquid (LL) regions were observed. High pressure micrographs demonstrated that the heavy phase (a pitch phase) transitioned from a glass to a liquid state with increased temperature and feed propane content. Pressure-temperature and pressure-composition phase diagrams were constructed from saturation pressure and pitch phase onset data. The amount and composition of the heavy phase was also measured. Solvent-free pitch yields as high as 70 wt% of the bitumen were observed. Pseudoternary diagrams were also constructed to observe the partitioning of the species between the phases. Finally, the ability of a cubic equation-of-state with two forms of mixing rules were explored to model the data. The results can be used in the design of in situ and surface processes involving the addition of propane to bitumen.

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Section: Bitumen/n-alkane Phase Regionsmentioning

confidence: 90%

Section: List Of Figures and Illustrationsmentioning

confidence: 99%

Section: Objectivesmentioning

confidence: 99%

Section: Oil Characterization Based On Distillation Assaysmentioning

confidence: 99%

mentioning

confidence: 99%

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The Phase Behavior of Heavy Oil and Propane Mixtures

Mancilla-Polanco

Schoeggl

Johnston

et al. 2017

Day 2 Thu, February 16, 2017

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Regular solution theory applied to asphaltene related phase behaviour

Yarranton

Ramos-Pallares

2021

Can J Chem Eng

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Asphaltenes are the least soluble fraction of crude oil and they can phase separate from the oil upon a change in temperature, pressure, or composition. This phase separation, often described as precipitation, may be beneficial (eg, in a partial deasphalting process) or detrimental (eg, in pipeline and surface equipment fouling). A phase behaviour model that can predict the onset and amount of asphaltene precipitation and is compatible with process simulators is desirable for the design and operation of these processes. This brief review focuses on the regular solution modelling approach. The regular solution model is based on activity coefficients and therefore is well suited for liquid‐liquid phase separations such as asphaltene precipitation. The model and its internal correlations are presented and its performance on asphaltene phase separation from mixtures of heavy oils and solvent is demonstrated. Recent updates to this approach are presented and potential future applications are discussed. The strengths and limitations of this approach for oilfield applications are highlighted.

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