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Correlation of high‐pressure phase equilibria in the retrograde region with three common equations of state
Author(s) -
Dohrn Ralf,
K¨︁nstler Wolfgang,
Prausnitz John M.
Publication year - 1991
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.5450690521
Subject(s) - thermodynamics , methane , equation of state , binary system , binary number , chemistry , phase diagram , decane , pressure drop , phase (matter) , physics , mathematics , arithmetic , organic chemistry
Phase equilibria in the retrograde regions were calculated for the methane — n ‐decane binary system and for a realistic natural‐gas system (methane ‐ Kensol‐16). Calculations were performed using three equations of state (EOS): Peng‐Robinson, Redlich‐Kwong‐Soave and Perturbed‐Hard‐Chain; calculations were compared to experiment. Liquid‐drop‐out curves and pressure‐temperature diagrams were calculated between 301 and 369 K and pressures to 90 MPa. The binary system was represented best by the Peng‐Robinson EOS. For the natural‐gas system, the Perturbed‐Hard Chain equation yielded the best results, although all equations of state showed appreciable deviations. Good results could only be obtained when binary coefficients were fitted to the experimental retrograde data.