An Improved Model of Second Virial Coefficients for Polar Fluids and Fluid Mixtures
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A corresponding-states model was developed empirically for calculating the second virial coefficients of polar fluids and fluid mixtures. In this model, a "nonpolar" and a "polar" acentric factors characterize size/shape and polarity/association effects, respectively. The new model contains a polarity or an association parameter (<I>α</I><SUB>P</SUB> or <I>α</I><SUB>HB</SUB>), which can be estimated from fluid's reduced dipole moment through a specific generalized correlation. The temperature function of association contribution was found to depend on fluid's reduced dipole moment. This generalized model predicts well the second virial coefficients for a diversity of polar fluids and strongly hydrogen-bonded substances. The new model with a set of recommended <I>k<SUB>ij</SUB></I>'s can reasonably estimate the second virial cross-coefficients.
- JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 31(4), 518-526, 1998-08
The Society of Chemical Engineers, Japan