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

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