Vapor–liquid equilibria of multi-indexed continuous mixtures using an equation of state and group contribution methods

In this work, vapor–liquid equilibria (VLE) calculations for a continuous mixture are carried out. The Peng–Robinson EOS is employed, and a new approach for parameter evaluation is proposed, using group contribution methods. This approach was possible through the use of a convenient choice for the c...

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Bibliographic Details
Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2000-06, Vol.77 (3), p.179-187
Main Authors: Peixoto, F.C., Platt, G.M., Pessôa, F.L.P.
Format: Article
Language:English
Subjects:
Chemical thermodynamics
Chemistry
Exact sciences and technology
Flash calculation
General and physical chemistry
General. Theory
Multi-indexed continuous mixtures
Quadrature method
Vapor–liquid equilibria
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Summary:In this work, vapor–liquid equilibria (VLE) calculations for a continuous mixture are carried out. The Peng–Robinson EOS is employed, and a new approach for parameter evaluation is proposed, using group contribution methods. This approach was possible through the use of a convenient choice for the characteristic continuous index. Multi-indexed continuous mixtures are focused on, which has been avoided in the literature probably because of the mathematical complexity of such modeling. Two algorithms were proposed for VLE calculations (flash with P and T fixed, bubble and dew points) and three kinds of continuous mixtures (linear paraffins, polyunsaturated fatty acids (PUFA) and oil fractions) were analyzed.
ISSN:1385-8947
1873-3212
DOI:10.1016/S1385-8947(99)00161-8