Phase equilibria of (Methylbenzene + Carbon dioxide + Methane) at elevated pressure: Experiment and modelling

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Title: Phase equilibria of (Methylbenzene + Carbon dioxide + Methane) at elevated pressure: Experiment and modelling
Authors: Al Ghafri, SZ
Trusler, JPM
Item Type: Journal Article
Abstract: Phase equilibria in the ternary mixture (C7H8 + CO2 + CH4) were measured at temperatures of (323.15, 373.15 and 423.15) K and pressures up to 31 MPa by means of a synthetic method in which both bubble- and dew-points were measured. The results were compared with calculations based on the SAFT-γ Mie and the Predictive Peng-Robinson (PPR-78) equations of state, both of which use group-contribution approaches for parameters estimations. At low pressures, good agreement was observed with both models but this deteriorated with increasing pressure and, in the critical region, both models over-predict the pressure. The deviations are more pronounced at the highest methane content in the ternary system and at the lowest temperature. SAFT-γ Mie is shown to generally give better agreement with experiment than PPR-78. The current work suggests that the interaction parameters between CH4 and one or more of the functional groups in methylbenzene require further refinement.
Issue Date: 1-Mar-2019
Date of Acceptance: 14-Nov-2018
ISSN: 0896-8446
Publisher: Elsevier
Start Page: 1
End Page: 9
Journal / Book Title: Journal of Supercritical Fluids
Volume: 145
Copyright Statement: © 2018 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence
Sponsor/Funder: Qatar Petroleum
Funder's Grant Number: N/A
Keywords: 03 Chemical Sciences
05 Environmental Sciences
09 Engineering
Chemical Engineering
Publication Status: Published
Embargo Date: 2019-11-19
Online Publication Date: 2018-11-19
Appears in Collections:Faculty of Engineering
Chemical Engineering

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