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

Publication: Research - peer-reviewJournal article – Annual report year: 2012

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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
StatePublished - 2012

Bibliographical note

© 2012 American Chemical Society

CitationsWeb of Science® Times Cited: 28


  • Speed of sound, EOS, PC-SAFT, Universal constants, Parameter estimation
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ID: 12696786