Phase behaviour of CO₂ ‐bitumen fractions

Abstract

The phase behaviour of Cold Lake bitumen and its five fractions (or "cuts") saturated with carbon dioxide is examined. The two lightest fractions ($ < 510°C) were clear liquids, whereas the third and fourth fractions were dark and viscous, i.e. much like the whole bitumen. The fifth fraction was a glass-like solid, with a softening temperature of approximately 100°C. The vapour-liquid equilibrium (VLE) data for the bitumen and bitumen fractions saturated with CO, were collected at temperatures from 25 to 150°C and pressures up to 10 MPa. Experiments were also performed at conditions under which pure CO, exists as a liquid. The VLE and LLE data were correlated with the Peng-Robinson equation of state by modeling each bitumen fraction as one pseudocomponent whose critical properties and acentric factor were estimated from correlations available in the literature.The C0,-solubility and density data were used to develop generalized correlations for the critical pressure and the binary interaction parameter (k,j) in terms of molar mass and critical temperature. The model was subsequently used to predict the solubility of CO, in the whole bitumen which was represented as a 5-component mixture. A correlation for Cut ;-Cut j binary interaction parameter (k,.) was developed in terms of temperature and the difference in hydrocarbon molar masses. The average deviation in the predicted and experimental C0,-solubility in the whole Cold Lake bitumen was less than 7%.On examine ici le comportement de phase dii bitume de Cold Lake et de ses cinq fractions (ou ucoupuresb) saturees avec du dioxyde de carbone. Les deux fractions les plus legbres (bp < 510°C) sont des liquides clairs, tandis que les troisibme et quatribme fractions sont noires et visqueuses comme le bitume pur. La cinquikme fraction est solide comme du verre, avec une temperature de ramollissement approximative de 100°C. Les donnkes d'equilibre liquidevapeur (ELV) pour le bitume et les fractions de bitume saturees avec du CO, ont CtC recueillies a des temperatures comprises entre 25 et 150°C et des pressions allant jusqu'h 10 MPa. Les experiences ont Cgalement CtC menees en presence de CO, pur sous forme liquide. On a corrClC les donnCes d'equilibre ELV et ELL avec 1'Cquation d'Ctat de Peng-Robinson en modelisant chaque fraction de bitume comme un pseudo-composant dont les propriCtCs critiques et le facteur acentrique furent estimks h partir des corrClations parus dans les travaux publiks.On a utilisC les donnees de la solubilitk du CO, et de la masse volumique pour Ctablir des corrClations generalisdes pour la pression critique et le paramktre d'interaction binaire ( k i j ) en fonction de la masse molaire et de la tempCrature critique. On a utilisC par la suite le modttle pour prkdire la solubilite du CO, dans le bitume pur qui est reprCsente comnie un melange a 5 composants. Une correlation a ttC ttablie pour le parambtre d'interaction binaire fraction ifraction j par rapport k la temphture et a la difference dans les masses molaires des hydrocarbures. L'Ccart m...

Prediction of solubility of CH4, C2H6, CO2, N2 and CO in bitumen

“…Therefore, we use the same terminology throughout this article. Letting subscript s and superscript b refer to the solvent and bitumen, respectively, we can write the equality of fugacity for the dissolved gases in the gas and bitumen phase at equilibrium condition as: Mehrotra and Svrcek [19] Proposed model 1.79 287.85-371.35 2.14-10.95 Kariznovi et al [3] 8.89 Eastick et al [5] 6.8 A 3152.545 Mehrotra and Svrcek [2] 1.9 Yu et al [14] Proposed Huang and Radosz [9] 5.675 Huang and Radosz [8] 5.44…”

“…[2] 2.7 A 3007. 5 Kariznovi et al [3] 3.74 Fu et al [4] Proposed [3] 7.51 v 1 s 58.592 þ 0. 6914T Mehrotra et al [7] 8.6 [19] Proposed model 3.12 296.05-375.85 1.02-10.07 Mehrotra and Svrcek [2] 5.7 A 7101.63 Kariznovi et al [3] 7.64 Fu et al [4] Proposed [3] 6.56 v 1 s 173.64 À 0.…”

A method for characterization of bitumen

“…Once the solubility of solvent in bitumen is defined, density, viscosity and other physical properties can be calculated using the established methods. In previous solubility models bitumen has been considered as single pseudo-component (such as Zirrahi et al [10]; Fu et al [11]) or multicomponents (such as Kariznovi et al [12]; Eastick et al [13]; Huang and Radosz [14]; Mehrotra and Svrcek [15]). …”

“…Eastick et al [13] and Huang and Radosz [14] characterized Cold Lake bitumen using five pseudo-components to calculate solubility of CO 2 in the bitumen and its pseudo-components. They applied Peng-Robinson equation of state (PR-EoS) and statistical associating fluid theory (SAFT), respectively.…”

A New Method for the Characterization of Heavy Oil and Bitumen using Distillation Curve Data

“…Prediction of solubility of light components in bitumen or heavy oil is the key prerequisite for reservoir simulation and engineering studies of bitumen production, upgrading, fractionation and refining. In previous studies, bitumen has been assumed as single pseudo-component (Zirrahi et al 2014, Fu et al 1986 or multicomponents (Kariznovi et al 2010, Eastick et al 1992, Huang and Radosz 1991. Multicomponent characterization has been recommended as a preferred approach in literature .…”