Department of Chemical Engineering;
Beijing Institute of Technology;
Beijing 100081;
China;
University of Oldenburg;
Technische Chemie;
D-26111 Oldenburg;
Germanyo extend the PSRK (predictive Soave-Redlich-Kwong equation of state) model to vapor-liquid equilibria of polymer solutions;
a new EOS-gE mixing rule is applied in which the term ∑xi ln(b/bi) in the PSRK mixing rule for the parameter a;
and the combinatorial part in the original universal functional activity coefficient (UNIFAC) model are cancelled. To take into account the free volume contribution to the excess Gibbs energy in polymer solution;
a quadratic mixing rule for the cross co-volume bij with an exponent equals to 1/2 is applied. The literature reported Soave-Redlich-Kwong equation of state (SRK EOS) parameters ofpure polymer are employed. The PSRK model with the modified mixing rule is used to predict the vapor-liquid equilibrium (VLE) of 37 solvent-polymer systems over a large range of temperature and pressure with satisfactory results.;
PSRK模式; 混合工艺; 聚合物; 计算方法; UNIFAC模式;