Showing papers on "UNIQUAC published in 1988"
TL;DR: In this article, the vapour pressures of butan-1-ol + n -octane or n -decane were measured at 373.15 and 383.15 K using the ebulliometric method.
31 citations
TL;DR: The results for (methanol + toluene) and for the two other binary mixtures constituting the ternary mixture are well correlated by the extended UNIQUAC equation.
31 citations
19 citations
TL;DR: In this paper, a model developed from thermodynamic principles for correlating phase behavior of two-and three-phase systems is described, based on the representation of excess Gibbs energy with the UNIQUAC equation.
Abstract: This paper describes a model developed from thermodynamic principles for correlating phase behavior of two-and three-phase systems. The model is based on the representation of excess Gibbs energy with the UNIQUAC equation. A set of computational algorithms is described for estimating the UNIQUAC model parameters from regression of the equilibrium phase data and for predicting phase behavior throughout the entire composition range. The model has been tested for ternary systems and a pseudoternary system. Agreement between the measured and predicted data was excellent for most systems studies. The model was able to match the ternary phase behavior of two- and three-liquid-phase systems that have not been previously simulated. For ternary systems, the estimated UNIQUAC parameters from correlation of the three-phase tie-triangle data describe the phase behavior in both two- and three-phase regions.
12 citations
TL;DR: In this paper, experimental tie-line data at 25 ° C were presented for the ternary systems methanol (cyclo-hexane or n-heptane)-(1-propanol or 1-butanol or 2-Butanol).
12 citations
TL;DR: In this article, a suitable extraction process for separating ethanol and water using dichloromethane as the solvent has been chosen, and the design calculations have been carried out to determine the energetic requirements.
Abstract: Liquid-liquid equilibrium data for the ternary system water-ethanol-dichloromethane have been determined experimentally at 25/sup 0/C and correlated simultaneously with vapor-liquid equilibrium data by using the UNIQUAC model. A suitable extraction process for separating ethanol and water using dichloromethane as the solvent has been chosen, and the design calculations have been carried out to determine the energetic requirements. The properties that another solvent should offer to decrease these energetic requirements have been studied.
11 citations
TL;DR: The experimental results for three binary mixtures composing the ternary mixture are well correlated with the UNIQUAC associated-solution model as mentioned in this paper, with good accuracy by the model with binary parameters alone.
11 citations
TL;DR: In this paper, a new calculation method for the binary closed-loop coexistence curves of liquid equilibria has been developed in terms of lattice decoration and the UNIQUAC equation.
9 citations
TL;DR: In this paper, the effect of specific and nonspecific interactions on the solubilities and vapour pressures of 10 binary three-phase systems (S - L - V) has been discussed.
9 citations
TL;DR: In this paper, equilibrium data for the binary liquid-liquid system water + methyl propyl ketone at temperatures in the range 20-55°C, together with solubilities and equilibrium compositions of the ternary system water+ acetic acid + methyl polycyclic tetramer at 25, 35, 45 and 55°C were reported.
Abstract: This article reports equilibrium data for the binary liquid-liquid system water + methyl propyl ketone at temperatures in the range 20-55°C, together with solubilities and equilibrium compositions of the ternary system water + acetic acid + methyl propyl ketone at 25, 35, 45 and 55°C. NRTL and UNIQUAC equations have been fitted to the experimental data for the ternary system, which are likewise compared with the values predicted by the group contribution method UNIFAC.
Dans cet article on presente des donnees d'equilibre pour le systeme binaire liquide-liquide eau + methyl propyle cetone a des temperatures comprises entre 20 et 55°C, ainsi que les solubilites et les compositions a l'equilibre du systeme ternaire eau + acide acetique + methyl propyle cetone a 25, 35, 45 et 55°C. On a ajuste les equations NRTL et UNIQUAC les donnees experimentales du systeme ternaire; ces donnees sont egalement comparees semblables aux valeurs predites par la methode de contribution de groupe UNIFAC.
8 citations
TL;DR: For the separation of fusel oil from low-concentration fermentation broths, ternary liquid-liquid equilibria at 323.2 K were measured for the systems of water and 1, 1-difluoroethane with alcohols as mentioned in this paper.
Abstract: For the separation of fusel oil from low-concentration fermentation broths, ternary liquid-liquid equilibria at 323.2 K were measured for the systems of water and 1, 1-difluoroethane with alcohols (l-propanol, 1-butanol and 1-pentanol). The liquefied gas 1, 1-difluoroethane can achieve much higher distribution coefficients of l-propanol, 1-butanol and 1-pentanol than ethanol. Therefore, 1-propanol, 1-butanol and 1-pentanol will be selectively removed from low-concentration ethanol aqueous solutions with liquefied 1, 1-difluoroethane at low solvent ratios. The liquid-liquid equilibrium data were correlated by the UNIQUAC and NRTL equations. The UNIQUAC equation gave better correlation of the experimental data than did the NRTL equation. However, the two-phase regions estimated by the UNIQUAC equation were larger than the experimental results for the systems of water + 1-propanol + 1, 1-difluoroethane and water + 1-pentanol + 1, 1-difluoroethane.
TL;DR: In this article, isothermal vapour pressure data were measured over the whole composition range for binary acetonitrile-2-butanol and ternary ACE-2butanol-benzene systems and the experimental data were obtained at 60 ° C using a Boublik vapour recirculating equilibrium still.
TL;DR: In this paper, mutual binary solubility data for perfluoromethylcyclohexane+n-hexane, n-heptane and n-octane were reported.
TL;DR: In this article, it was found that the simulated separation at total reflux is dependent on the predictive thermodynamic package and that the limitations of these predictive methods must be considered in the design and retrofit of distillation columns.
01 Jan 1988
TL;DR: In this paper, the authors used NRTL and UNIQUAC models to predict the ternary liquid-liquid equilibrium (LLE) data for the n-butyl alcohol-water, butyl acetate and related binary systems at 293.15,303.15 and 313.15 K.
Abstract: Liquid-liquid equilibrium(LLE)data have been determined for the n-butyl alcohol-water-butyl acetate ternary system and the related binary systems at 293.15,303.15 and 313.15 K.The experimentally determined LLE data for the n-butyl alcohol-water binary system have been found to be in satisfactory agreement with the available literature data.The correlation and prediction of the LLE data have been done by using NRTL and UNIQUAC models.The model parameters of binary systems have been identified with a thermodynamic criterion.In the correlation of ternary LLE data,two objective functions(mole fraction and distribution constant)have been used for purpose of comparison.The effect of weighting in the first objective function has been examined.In predicting the ternary LLE with different sets of parameter values obtained for each of the constitutent binary systems,improved prediction results have been obtained by comparing the results of different combinations of the sets of parameter values and choosing those giving the best result.
TL;DR: In this paper, the authors proposed a procedure called ISAC for isoactive solvent in which the constituent gas-liquid binaries are the standard state, and the mixing process is based on a ψ potential, a Legendre transformation of the Gibbs free energy for which the activity of the solvent is an independent variable.
TL;DR: Isothermal vapor-liquid equilibrium data for the three ternary systems containing ethanol have been reported from this laboratory (7 -3), and as mentioned in this paper presented similar measurements for the system ethanol-acetonitrile-chloroform at 40 OC and compared the experimental results with those calculated by the extended UNIQUAC equation.
Abstract: Isothermal vapor-liquid equilibrium data for the three ternary systems containing ethanol have been reported from this laboratory ( 7 -3). This work presents similar measurements for the system ethanol-acetonitribchloroform at 40 OC and compares the experimental results with those calculated by the extended UNIQUAC equation (4). Vapor-liquid equilibrium data for the three binary systems constituting the present ternary system are available in the literature: for ethanol-acetonitrile at 40 OC (5); for ethanol-chloroform at 35 O C (6); for acetonitrile-chloroform at 40 OC (7).
01 Jan 1988
TL;DR: In this paper, the effects of addition of four halogen salts (KF, NaCl, NaBr, NaI) to benzene-water-n-propanol system were considered.
Abstract: Binodal curves, tie lines, and plait points for benzenehalogen salt solutions-n-propanol systems were determined, and Othmer-Tobias equation was employed for a system without salt and Eisen-Joffe equation for systems with salt to test consistency. Halogen salt solutions were prepared with aqueous solution of 5% KF, 5% NaCl, 5% NaBr and 5% NaI, respectively. Compositions of two splitting phases on liquid-liquid equilibria(L-L-E) condition were calculated and the parameters were estimated by correlating experimental tie lines with the NRTL and the UNIQUAC (or modified UNIQUAC) models. The effects of addition of four halogen salts (KF, NaCl, NaBr, NaI) to benzene-water-n-propanol system were considered.
TL;DR: In this article, experimentally determined vapour-liquid equilibrium data for benzene + cyclohexane + 1-butanol mixtures at constant pressure of 101.325 kPa, and compared the results with those predicted by the group contribution methods ASOG-KT and UNIFAC and by the Wilson, NRTL and UNIQUAC models after calculation of their adjustable parameters from corresponding binary systems.
Abstract: This article reports experimentally determined vapour-liquid equilibrium data for benzene + cyclohexane + 1-butanol mixtures at constant pressure of 101.325 kPa, and compares the results with those predicted by the group contribution methods ASOG-KT and UNIFAC and by the Wilson, NRTL and UNIQUAC models after calculation of their adjustable parameters from the corresponding binary systems.
On propose dans cet article des donnaes d'aquilibre liquide-vapeur daterminaes de maniare exparimentale pour des malanges benzane + cyclohexane + 1-butanol a une pression constante de 101, 325 kPa. Les ra5sultats sont comparas aux rasultats pradits par les mathodes de contribution de groupe ASOG-KT et UNIFAC, et par les modales UNIQUAC, NRTL et Wilson, apras avoir calcula leurs paramatres ajustables a partir des systames binaires correspondants.