Approach to Improve Speed of Sound Calculation within PC-SAFT Framework

Xiaodong Liang, Bjørn Maribo-Mogensen, Kaj Thomsen, Wei Yan, Georgios Kontogeorgis

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An extensive comparison of SRK, CPA and PC-SAFT for speed of sound in normal alkanes has been performed. The results reveal that PC-SAFT captures the curvature of speed of sound better than cubic EoS but the accuracy is not satisfactory. Two approaches have been proposed to improve PC-SAFT’s accuracy for speed of sound: (i) putting speed of sound data into parameter estimation; (ii) putting speed of sound data into both universal constants regression and parameter estimation. The results have shown that the second approach can significantly improve the speed of sound (3.2%) prediction while keeping acceptable accuracy for the primary properties, i.e. vapor pressure (2.1%) and liquid density (1.5%). The two approaches have also been applied to methanol, and both give very good results.
Original languageEnglish
JournalIndustrial & Engineering Chemistry Research
Issue number45
Pages (from-to)14903-14914
Publication statusPublished - 2012

Bibliographical note

© 2012 American Chemical Society


  • Speed of sound
  • EOS
  • Universal constants
  • Parameter estimation


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