Tatsuhiko Ohta

Vapor—liquid equilibria for the ternary Ethanol—2-butanone—benzene system at 298.15 K

Abstract Vapor—liquid equilibrium data for the ternary ethanol—2-butanone—benzene system and its constituent binary systems at 298.15 K are presented. The results are correlated with the Wilson, original and modified UNIQUAC equations and the UNIFAC group contribution method.

Thermodynamic study of complex formation in four binary liquid mixtures containing chloroform

Abstract The molar excess Gibbs free energies obtained from isothermal vapor—liquid equilibrium measurements, and excess enthalpies are reported for four binary systems formed by chloroform with 2-butanone, methyl acetate, ethyl acetate, and ethyl formate. The experimental results are satisfactorily analyzed by the ideal associated solution model of McGlashan and Rastogi (1958).

Prediction of the excess enthalpies of mixing of mixtures using the UNIFAC method

Abstract The UNIFAC model, developed for binary systems alkanes with n -alcohols, ketones, esters and ethers, and for ternary n -alcohol— n -alcohol— n -alkane systems, gives satisfactory predictions of excess enthalpies of mixing for the systems studied.

Representation of excess enthalpies by the PRSV equation of state with the modified Huron-Vidal first order and Wong-Sandler mixing rules

Abstract Excess enthalples HE for various kinds of binary systems at low and high pressures are well represented by the PRSV equation of state with the modified Huron-Vidal first order (MHV1) and Wong-Sandler (WS) mixing rules. The NRTL and modified UNIQUAC excess. Gibbs free energy GE models with linearly temperature-dependent parameters are used for the two mixing rules, introducing the parameters determined from low-pressure vapor-liquid and liquid-liquid equilibria. Good predictions are obtained for strongly non-ideal ternary systems. Simultaneous representation of vapor-liquid equilibria and HE data is also made for four binary systems using the present equation of state/GE models.

Prediction of ternary phase equilibria by the PRSV2 equation of state with the NRTL mixing rule

Abstract The PRSV2 cubic equation of state proposed by Stryjek and Vera is tested for the prediction of ternary vapor—liquid and liquid—liquid equilibria for a variety of mixtures at low reduced temperatures using the NRTL mixing rule. The good capability of the equation of state is illustrated by typical examples for strongly non-ideal mixtures containing non-polar, polar and associating substances.

Use of the PRSV2 equation of state with the NRTL mixing rule for the prediction of ternary high-pressure vapor—liquid equilibria

Abstract The PRSV2 equation of state coupled with the NRTL mixing rule is tested for the prediction of ternary high-pressure vapor—liquid equilibria for six mixtures containing several polar substances. Good prediction of vapor—liquid equilibrium data can be performed without the use of adjustable ternary parameters.

Prediction of ternary excess enthalpies using the PRSV and PRSV2 equations of state

Abstract Binary excess enthalpies for a variety of mixtures at low pressures are well represented by use of the PRSV and PRSV2 equations of state. The Huron-Vidai mixing rules from excess Gibbs energy models are used for the calculation of the parameters in the equations of state. This method is easily extended to predict ternary excess enthalpies without introducing any ternary parameters. Calculated results agree with the published data for highly non-ideal mixtures containing non-polar, polar and associating substances.

Isothermal vapor–liquid equilibria of the ternary system formed by ethanol, tert-amyl methyl ether and toluene

Abstract Vapor–liquid equilibrium (VLE) data are presented for the ternary system ethanol–tert-amyl methyl ether (TAME)–toluene at 333.15 K. The experimental results were measured by using a Boublik vapor–liquid recirculation still. The results are compared with values predicted from the PRSV equation of state with the modified Huron–Vidal first order (MHV1) and Wong–Sandler (WS) mixing rules. Good agreement is obtained.

Calculations of excess enthalpies of binary systems at high pressures by means of a cubic equation of state

Abstract The molar excess enthalpies H E of various kinds of binary systems at high pressures are represented by the prsv equation of state coupled with the nrtl mixing rule. 47 sets of data for binary H E in the liquid, two-phase, and gaseous regions are studied. Good agreement is obtained between calculated and experimental values for all the systems.

Prediction of multicomponent vapor-liquid equilibria using the PRSV and PRSV2 equations of state with the Huron-Vidal mixing rules

Abstract The Stryjek-Vera modifications of the Peng-Robinson equation of state are tested for the prediction of multicomponent vapor-liquid equilibria at low pressures for highly non-ideal systems including seven ternary, two quaternary and one quinary mixtures. The Huron-Vidal mixing rules from three excess free energy models are used for the calculation of the parameters in the PRSV and PRSV2 equations of state. The two equations of state with the mixing rules perform equally well.