Critical points of hydrocarbon mixtures with the Peng–Robinson,SAFT, and PC-SAFT equations of state |
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Authors: | Marcelo F Alfradique Marcelo Castier |
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Institution: | 1. Escola de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil;2. Department of Chemical and Petroleum Engineering, U.A.E. University, Al-Ain, P.O. Box 17555, United Arab Emirates |
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Abstract: | The phase behavior of fluids at high pressures can be rather complex, even for mixtures of relatively simple molecules, such as hydrocarbons. In this work, we use the Hicks and Young algorithm to calculate mixture critical points, comparing five modeling options: Peng–Robinson EOS: (1) original and (2) with parameters fitted from molar volume and vapor pressure data; (3) SAFT EOS; and PC-SAFT EOS: (4) original and (5) with refitted parameters to match pure component critical data. Calculations were carried out for binary hydrocarbon mixtures and 29 multicomponent mixtures. The SAFT EOS provided the worst representation of the systems tested and, interestingly, the conventional cubic EOS provided, in general, the best representation. |
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Keywords: | Critical points Equations of state SAFT PC-SAFT Peng&ndash Robinson Hydrocarbons |
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