Experimental determination of the critical loci for {n-C6H14 or CO2+ alkan-1-ol} mixtures. Evaluation of their critical and subcritical behavior using PC-SAFT EoS
2012; Elsevier BV; Volume: 71; Linguagem: Inglês
10.1016/j.supflu.2012.07.008
ISSN1872-8162
AutoresLaura Gil, Sofı́a T. Blanco, Clara Rivas, Eduardo Laga, Javier Fernández, Manuela Artal, Inmaculada Velasco,
Tópico(s)Thermodynamic properties of mixtures
ResumoVapor–liquid critical locus (x, Tc, Pc) has been determined, in the whole range of mole fractions, for the systems {n-hexane + methanol, or +ethanol, or +propan-1-ol, or +butan-1-ol} and {CO2 + methanol, or +ethanol, or +propan-1-ol, or +butan-1-ol}. A comprehensive bibliographic review for the vapor–liquid equilibrium (VLE) and the critical locus of these systems has been performed, and they have been modelled with PC-SAFT EoS. The three parameters that characterize the segments of pure compounds have been rescaled from their critical point values. In all cases, the classical mixing rules and temperature-dependent binary interaction parameters kij(T)=kij0+kij1T have been used. The average deviations obtained for the n-hexane + alkan-1-ol binary mixtures are: for critical loci, mean relative deviation in critical temperature MRD(Tc) = 0.47% and in critical pressure MRD(Pc) = 3.38%; for VLE, mean relative deviation in bubble pressure MRD(P) = 2.90% and absolute deviation for the solvent mole fraction in the vapor phase ΔyC6H14=0.031. The average deviations obtained for the CO2 + alkan-1-ol binary mixtures are MRD(Tc) = 1.91% and MRD(Pc) = 5.93%; MRD(P) = 7.07% and ΔyCO2=0.022.
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