Wong-Sandler model

KIU=THE WONG-SANDLER MODEL BINARY INTERACTION PARAMETER. ALPHAIJ=THE NRTL MODEL ALPHA PARAMETER. 

Shifflett, M. B. Sandler, S. I. Modeling fluorocarbon vapor-hquid equilibria using the Wong-Sandler model Fluid Phase Equilib. 1998,147, 145-162... 

The pressure range of about 60-360 bar and temperature range from 35-70 °C are involved. Table 3 reports the results of the solubility calculations with 18 selected models. An important point must be emphasized, the Wong-Sandler mixing rule coupled with the UNIQUAC model generated a serious instability such that it was impossible to converge. Table 4 illustrates the variation of solid solubility and mixture density for a typical binary mixture. 

Figure 4.3.3. VLE correlation of the carbon dioxide and propane binary system at 277,310, and 344 K with the Wbng-Sandler (WS) mixing rule combined with the van Laar excess free-energy model and the PRSV equation of state. The van Laar model parameters used are f/j0 = AJ2/A21 = 0,7897/0,7928, and the Wong-Sandler mixing rule parameter k 2 = 0.3565. (Points are experimental data from the DECHEMA Chemistry Data Series, Gmehting and Onken, Vol. 6, p, 589 data files for this system on the accompanying disk are C02C3277.DAT, CO2C33I0.DAT and C02C3344.DAT.)...

Figure 4.3.4. VLE correlation (solid lines) of the 2-propanol and water binary system at 353 K with the Wong-Sandler (WS) mixing rule combined with the NRTL excess free-energy model and the PRSV equation of state. The dashed lines are calculated with a = 0.2529, ri2/T2i =0,1562/2,7548, and with the Wong-Sandler mixing rule parameter k 2 = 0.2529 obtained by fitting the experimental data. The solid lines represents results calculated with a =0.2893 and T 2/t2i =0.1509/1.8051 obtained from the DECHEMA Chemistry Series at 303 K (Gmehling and Onken 1977, Vol.l, Pt. 1, p.

Figure 4.3.9. Comparison of VLB predictions of the 2-propanoi and water binary system at 353 K from the Wong-Sandler (solid lines) and Huron-Vidal original (dashed lines) models with both model parameters obtained by fitting the experimental data at 303 K. Points are the experimental data of Barr David and Dodge 1959.

In these equations, G , the molar excess Gibbs free-energy obtained from any excess free-energy model, is a function of temperature and composition only. Even though the Wong-Sandler derivation involves the Helmholtz free-energy of the mixture, this substitution is due to the assumption that G (7 , Zi) = P, z,). See... 

WS THE WONG-SANDLER MIXING RULE FOR BINARY VLE CALCULATIONS methanol - water at 373 K EXCESS ENERGY MODEL = VAN LAAR K12-. 2001... 

D.6. Program WSUNF Binary VLE Predictions Using the Wong-Sandler Mixing Rule Combined with the UNIFAC Excess Free-Energy Model... 

WSUNF BINARY VLE CALCULATIONS WITH THE WONG-SANDLER NIXING RULE AND THE UNI FAC MODEL... 

Figure 10.3-9 Vapor-liquid equilibria of the acetone -f water binary mixture correlated using the combination of the Peng-Robinson equation of state, the Wong-Sandler mixing rule, and the NRTL activity coefficient model. The three parameters in this model have been fit to data for each isotherm.

This time the mixing rules proposed by Wong Sandler can make use of the interaction parameters already identified for liquid activity models, such as no supplementary regression is needed. In this way, a huge existing experimental... 

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