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DYNA

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Abstract

RAMIREZ, Oscar; BETANCUR, Carolina; HOYOS, Bibian  and  NARANJO, Carlos. Modeling of CO2 vapor-liquid equilibrium in Colombian heavy oil using SARA analysis. Dyna rev.fac.nac.minas [online]. 2015, vol.82, n.191, pp.103-108. ISSN 0012-7353.  http://dx.doi.org/10.15446/dyna.v82n191.42308.

The solubility of CO2 in Colombian heavy oil was calculated using the Peng-Robinson cubic equation of state and the Lee-Kesler correlations. The crude was represented as a mixture of pseudo-components and for each one of them, the thermodynamic and critical properties were estimated. The results obtained in representing the oil with four, five and six pseudo-components show that all these representations produce similar results and therefore the use of four pseudo-components is sufficient and has a lower computational cost. Excellent results were obtained by comparing the experimental and calculated data. For this system, it is enough to have a complete characterization of the SARA analysis and to use four pseudo-components to adequately model the vapor-liquid equilibrium of CO2 -heavy oil.

Keywords : Equation of state; pseudo-component; SARA analysis; crude; solvent; phase equilibrium.

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