Modification of the predictive capability of the PRSV-2 equation of state for critical volumes of binary mixtures

The predictive capability of the Peng-Robinson-Stryjek-Vera (PRSV-2) equati on of state for critical properties of binary mixtures showing continuous c ritical lines has been investigated. The procedure adopted by Heidemann and Khalil and discussed by Abu-Eishah et al., in a previous paper, has been f ollowed. The effect of using the pure-component parameters of the PRSV-2 eq uation of state (kappa(1), kappa(2) and kappa(3)), new values of kappa(1), revised values of kappa(1), or giving zero values for these parameters have been investigated. The effect of using zero values or optimized values for the binary interaction parameter on the PRSV-2 predictive capability of cr itical properties have also been investigated. The standard and the average of the absolute relative deviations in critical properties are included. T he predicted critical temperature and pressure for the 20 nonpolar and 18 p olar systems studied here agree well with experimental data, and are always better than those predicted by the group-contribution method. A correction has been introduced here to the critical volume predicted by PRSV-2 equati on of state that makes the average deviations between the predicted and exp erimental values very close to or even better than those predicted by the g roup-contribution method. (C) 1999 Elsevier Science B.V. All rights reserve d.