The unavoidable necessity of considering temperature dependence of the liquid Gibbs energy of mixing for certain VLE data correlations

Marcilla, A.

doi:10.1016/j.fluid.2018.05.025

Cited by 19 publications

(23 citation statements)

References 5 publications

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“…In a previous paper [6], we achieved similar conclusions for temperature, demonstrating that for some isobaric VLE data sets, the use of additional T-dependence, like the one represented in Eqs. ( 1) and (2), is not a question of increasing the flexibility of the model because of the higher number of parameters used, but is demanded by the VLE data set itself.…”

Section: A C C E P T E D Accepted Manuscriptsupporting

confidence: 77%

“…There are a considerable number of VLE data sets, both isobaric and isothermal, with a very standard appearance that inexplicably cannot be satisfactorily correlated with any of the existing models to formulate the non-idealities of the liquid mixtures. From the point of view presented in this paper for isothermal conditions, and in a previous paper [6] for isobaric conditions, we have demonstrated that for these systems no model, as highly flexible as can be imagined, can fit the data if P or T dependence, respectively, are not included in the parameters of the model.…”

Section: Procedures For the Correlation Of Vle Datamentioning

confidence: 62%

“…1 [6]. In this figure, z 1 is the mole fraction of the lightest component in the binary global mixture (M) of components 1 and 2; x 1 L and y 1 V are used for the molar fractions (component 1) in the liquid and vapor phases at equilibrium, L and V respectively.…”

Section: Theoretical Developmentmentioning

confidence: 99%

“…In paper [6], we focused on isobaric conditions and showed that for some specific VLE data sets it is not possible to satisfy simultaneously both, the value and the slope of the g M,L curve, at each one of the liquid compositions. This treatment of the problem, which is not frequently considered, has demonstrated its relevant role in the understanding of the true nature of the limitations regarding correlation of isobaric VLE data.…”

Section: Theoretical Developmentmentioning

confidence: 99%

“…ACCEPTED MANUSCRIPT [6]. Next we discuss one example that belongs to group 2B: water (1) + n,n-dimethylacetamide (2) a P=200 mmHg [12].…”

Section: A C C E P T E Dmentioning

confidence: 99%

See 4 more Smart Citations

Procedure for the correlation of normal appearance VLE data, where the classical models dramatically fail with no apparent reason

Marcilla

Carbonell-Hermida

2019

Fluid Phase Equilibria

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The necessity of using a pressure (P) or temperature (T) dependence in the Gibbs energy of mixing of the liquid phase (g M,L ) for some isothermal (or isobaric) VLE data sets, respectively, is discussed in this paper. A graphical representation, directly obtained from the experimental data, is proposed as a method to clearly classify the behaviour of the systems and select the adequate model (i.e. including when appropriate the T or P dependence) to correlate them. The result is that many of the poorly fitted systems in the literature could be precisely modelled using the correct procedure with adequate functions of P or T. Some suitable examples are used to illustrate the validity of these ideas, providing satisfactory correlation results for those systems in the literature. The ideas presented in this paper reveal important aspects related to the inappropriate application of some thermodynamic consistency (TC) tests to evaluate the quality of VLE data sets.

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Section: A C C E P T E D Accepted Manuscriptsupporting

confidence: 77%

Section: Procedures For the Correlation Of Vle Datamentioning

confidence: 62%

Section: Theoretical Developmentmentioning

confidence: 99%

Section: Theoretical Developmentmentioning

confidence: 99%

“…ACCEPTED MANUSCRIPT [6]. Next we discuss one example that belongs to group 2B: water (1) + n,n-dimethylacetamide (2) a P=200 mmHg [12].…”

Section: A C C E P T E Dmentioning

confidence: 99%