TY - JFULL AU - Alexander Breitholz and Wolfgang Arlt and Ki-Pung Yoo PY - 2008/2/ TI - Group Contribution Parameters for Nonrandom Lattice Fluid Equation of State involving COSMO-RS T2 - International Journal of Nuclear and Quantum Engineering SP - 6 EP - 10 VL - 2 SN - 1307-6892 UR - https://publications.waset.org/pdf/10466 PU - World Academy of Science, Engineering and Technology NX - Open Science Index 13, 2008 N2 - Group contribution based models are widely used in industrial applications for its convenience and flexibility. Although a number of group contribution models have been proposed, there were certain limitations inherent to those models. Models based on group contribution excess Gibbs free energy are limited to low pressures and models based on equation of state (EOS) cannot properly describe highly nonideal mixtures including acids without introducing additional modification such as chemical theory. In the present study new a new approach derived from quantum chemistry have been used to calculate necessary EOS group interaction parameters. The COSMO-RS method, based on quantum mechanics, provides a reliable tool for fluid phase thermodynamics. Benefits of the group contribution EOS are the consistent extension to hydrogen-bonded mixtures and the capability to predict polymer-solvent equilibria up to high pressures. The authors are confident that with a sufficient parameter matrix the performance of the lattice EOS can be improved significantly. ER -