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• W2967185443 abstract "COSMO-RS refinements and applications have been the focus of numerous works, mainly due to their great predictive capacity. However, these models do not directly include pressure effects. In this work, a methodology for the inclusion of pressure effects in the functional-segment activity coefficient model, F-SAC (a COSMO-based group-contribution method), is proposed. This is accomplished by the combination of F-SAC and lattice-fluid ideas by the inclusion of free volume in the form of holes, generating the F-SAC-Phi model. The computational cost when computing the pressure (given temperature, volume, and molar volume) with the proposed model is similar to the cost for computing activity coefficients with any COSMO-type implementation. For a given pressure, the computational cost increases since an iterative method is needed. The concept is tested for representative substances and mixtures, ranging from light gases to molecules with up to 10 carbons. The proposed model is able to correlate experimental data of saturation pressure and saturated liquid volume of pure substances with deviations of 1.7 and 1.1%, respectively. In the prediction of mixture vapor–liquid equilibria, the resulting model is superior to COSMO-SAC-Phi, SRK-MC (Soave–Redlich–Kwong with the Mathias–Copeman α-function) with the classic van der Waals mixing rule, and PSRK in almost all tested cases, from low pressures to over 100 bar." @default.
• W2967185443 created "2019-08-22" @default.
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• W2967185443 date "2019-08-09" @default.
• W2967185443 modified "2023-10-17" @default.
• W2967185443 title "Functional-Segment Activity Coefficient Equation of State: F-SAC-Phi" @default.
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• W2967185443 doi "https://doi.org/10.1021/acs.iecr.9b02190" @default.
• W2967185443 hasPublicationYear "2019" @default.
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