Thermal Coefficients of the Water–Aliphatic Alcohol Binary System

The results of thermal coefficients calculations ( к T , α, β) of water–aliphatic alcohol (methanol, ethanol, 1-propanol) systems of different compositions (x=0.2, 0.5, 0.8 mole fractions of alcohol) in liquid and vapor phases, as well as at critical and supercritical regions of state parameters have been presented. The dependence of values of thermal coefficients from density temperature and composition at different states is shown. The calculations are based on the polynomial equation of state, represented by expansion of the compressibility factor into a power series of reduced density (ω=ρ/ρ cr ) and reduced temperature ( τ = T / T c r ) : Z = 1 + ∑ i = 1 m ∑ j = 0 n i a i j ω i / τ j . The mean percentage errors of the calculated pressure values relative to the experimental values depending on system and number of carbon atom is varied 0.6-3.3%.