期刊
FLUID PHASE EQUILIBRIA
卷 370, 期 -, 页码 75-84出版社
ELSEVIER
DOI: 10.1016/j.fluid.2014.02.028
关键词
Heavy hydrocarbons; Ternary; High temperature; Solubility; Density inversion
资金
- Center for Oil Sands Innovation (COSI)
- NSERC Industrial Research Chair in Petroleum Thermodynamics (Natural Sciences and Engineering Research Council of Canada (NSERC))
Accurate descriptions of the phase behavior and thermophysical properties of unconventional hydrocarbon resource + water mixtures are of great interest for their production, transport and refining. In this work, the phase behavior of ternary mixtures of Athabasca bitumen + toluene + water in the temperature range 473.2 to 573.5 K and pressure range 2.5 to 12.6 MPa are elucidated. Pressure-composition phase diagrams, solubility data for water in the hydrocarbon-rich phase, and the density of the water-saturated hydrocarbon phase are reported. Toluene + water binary exhibits Type IIIa phase behavior, where the toluene rich phase becomes critically identical with the vapor phase in the presence of a subcritical water-rich liquid phase. The Athabasca bitumen + water pseudo binary exhibits Type Bib phase behavior, where the water-rich liquid phase becomes critically identical with the vapor phase in the presence of a subcritical bitumen-rich phase. As toluene is added to the bitumen + water mixture, there is a transition in the order of liquid-vapor criticality. Further, the hydrocarbon-rich liquid phase becomes less dense than the water-rich liquid phase as toluene is added to the mixture. The boundary for the inversion of the phase density for mixtures of Athabasca bitumen + toluene + water is evaluated as a function of toluene composition, and these and other key features of the phase behavior and phase properties discussed. (C) 2014 Elsevier B.V. All rights reserved.
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