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Phase equilibria of crude oils using the continuous thermodynamics approach
Author(s) -
Koral Sunil L.,
Sayegh Selim G.,
George Albert E.
Publication year - 1993
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450710118
Subject(s) - dew point , boiling point , thermodynamics , legendre polynomials , gaussian quadrature , quadrature (astronomy) , boiling , molar mass , chemistry , gaussian , mathematics , physics , integral equation , mathematical analysis , organic chemistry , nyström method , polymer , computational chemistry , optics
Abstract This paper deals with the application of continuous thermodynamics to light and heavy oil systems using the Peng‐ Robinson equation of state. The composition of the high molar mass components in a reservoir oil is described by a continuous distribution function of some characterizing quantity, e.g. molar mass or boiling temperature. Numerical Gaussian quadrature methods are used to generate pseudo‐components and their mole fractions from distribution data. Several examples are presented for phase equilibria of solvent/crude oil systems. The results showed that semi‐infinite distribution functions, such as the Γ function, cannot be applied to all cases, e.g. dew point calculations. The Gauss‐ Legendre quadrature method coupled with spline fitting worked best for heavy oil systems.