Skip to Main content Skip to Navigation
Journal articles

Analysis and prediction of the alpha-function parameters used in cubic equations of state

Abstract : The performance of two generalized alpha functions (Soave and generalized Twu functions requiring the acentric factor as input parameter) and two parameterizable alpha functions (Mathias-Copeman and Twu) incorporated in cubic equations of state (Redlich-Kwong and Peng-Robinson) is evaluated and compared regarding their ability to reproduce vapor pressure, heat of vaporization, liquid heat capacity, liquid density and second virial coefficient data. To reach this objective, extensive databanks of alpha function parameters were created. In particular, pitfalls of Twu-type alpha functions were evidenced and fixed. A new class of purely predictive alpha functions was derived by applying group-contribution (GC) methods to the prediction of alpha function parameters. The interest of such an approach is discussed and compared to another predictive approach (use of generalized alpha functions coupled with GC methods to predict the acentric factor).
Document type :
Journal articles
Complete list of metadatas

https://hal.univ-lorraine.fr/hal-01267216
Contributor : Lrgp Ul <>
Submitted on : Thursday, February 4, 2016 - 10:10:48 AM
Last modification on : Sunday, September 13, 2020 - 10:32:06 AM

Identifiers

Collections

Citation

Romain Privat, Maxime Visconte, Anis Zazoua-Khames, Jean-Noël Jaubert, Rafiqul Gani. Analysis and prediction of the alpha-function parameters used in cubic equations of state. Chemical Engineering Science, Elsevier, 2015, 126, pp.584-603. ⟨10.1016/j.ces.2014.12.040⟩. ⟨hal-01267216⟩

Share

Metrics

Record views

209