Compressed Liquid Densities for Binary Mixtures at Temperatures from 280- 440K at Pressures up to 200 MPa

Document Type : Research Paper

Abstract

A method for predicting liquid densities of binary mixtures from heat of vaporization and liquid density
at boiling point temperature (ΔHvap and n b ρ ) as scaling constants, is presented. B2(T) follows a promising
corresponding-states principle. Calculation of α(T) and b(T), the two other temperature-dependent
constants of the equation of state, are made possible by scaling. As a result ΔHvap and n b ρ are sufficient for
determination of thermophysical properties of liquid mixtures. We applied the procedure to predict liquid
densities of (x1 n-butane + x2 isobutane) at compressed state with temperature range from 280 to 440 K and
pressures up to 200 MPa. The experimental liquid densities were correlated satisfactory with our procedure
and the results are within 5%.

Keywords

• Equation of state
• Liquid Densities
• Scaling Constants

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