Water PRSV parameters

Figure 3,4,5. VLE correlation of the 2-propanol and water binary system at 353 K with the IPVDW mixing rule and the PRSV equation of state. A binary interaction parameter k 2 = —0.1621 was used. (Points are the data of Wu, Hagewiessche, and Sandler 1988 the data file for this system on the accompanying disk is 2PW80.DAT.)...

Figure 4.2.3. VLE correlation of the acetone and water binary system at 298 K with the Huron-Vidal original (HVO) mixing rule with the van Laar excess free-energy model and the PRSV equation of state. The dashed lines denote results calculated with van Laar model parameters = A12/A21 = 3.5121/2.2227 obtained from fitting the experimental data, and the solid lines represent the results obtained with model parameters I//0 = Aj2/A2] = 1.9399/1.8022 obtained at the same temperature from the DECHEMA Chemistry Series (Gmehling and Onken 1977, Vol. 1, Pt. l,p. 238).

Figure 4.2.4. VLE correlation of the acetone and water binary system at 523 K with the Huron-Vidal original (HVO) mixing rule combined with the van Laar excess free-energy model and the PRSV equation of state. The dashed lines represent results calculated with van Laar model parameters = A12/A21 =...

These are parameters of water for the PRSV EOS from Table 3.1.1.)... 

Figure 5 depicts the liquid spinodal curves Sp(L) in a pressure-temperature diagram for fixed CO2 compositions. The region of negative pressures, which is of interest for describing the capillary properties of CO2 aqueous solutions, has been also included. Interestingly, it can be noted that spinodal Sp(L) isopleths present a pressure-temperature trend, which looks similar to the liquid spinodal curve of pure water.At low temperatures, the Sp(L) isopleths are decreasing steeply before to reach a pressure minimum. Then at subcritical temperatures, isopleths are less spaced and sloped, and they finish to meet the H2O-CO2 critical curve. The temperature appears as a determining parameter in the explosivity control of CO2 aqueous solutions. Like for water, the easiest way to generate an explosive vaporization is a sudden depressurization in the superspinodal domain, where spinodal curves have a gentle slope in a P-T diagram (Fig. 5). This superspinodal field can be estimated theoretically irom the PRSV equation of...

The PR eos has been modified by Stryjek and Vera to extend to polar substances that do not follow the three-parameter principle of corresponding states. The modified eos is fitted to the vapor pressure of polar substances with additional substance-specific parameters. The PRSV equation has been described in Equation (4.163) et seq. The free-energy-matched mixture eos parameters are given in Equations (4.436) and (4.438) the fugacity coefficients are given in Equation (4.439). PRSV eos using the UNIEAC activity coefficient predicts the vie data for both ethanol/water mixtures at 423-623°K and acetone/water mixtures at 373-523°K from low to high pressure. 

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