A new quartic equation of state

A new quartic equation of state (EOS) is presented, which consists of the r epulsive term of CCOR EOS and the attractive term of PT EOS, coupled with n ew parameters, the general forms of which are given for non-polar substance s. The new EOS can be solved algebraically like a cubic EOS. Calculated vap or pressures, specific volumes and evaporation enthalpies are compared with experimental data and with that calculated by CCOR EOS and PT EOS for a va riety of fluids. In low temperature region, the new quartic EOS produces mo re reliable results than commonly-used cubic EOS. One important character o f the new EOS is that it is capable of calculating specific volume of solid and sublimation pressure. The vapor-liquid equilibria (VLE), including vol ume properties, of binary mixtures are also well presented by the new EOS w ith van der Waals one-fluids mixing rules containing one adjustable paramet er. (C) 2001 Elsevier Science B.V. All rights reserved.