Ultrasonic and thermodynamic effects of self-association of aliphatic alcohols in c-C6H12. II. Primary and tertiary pentanols

The ultrasound velocities in and densities of mixtures of cyclohexane with n-pentanol {x1n-C5H11OH + (1-x1)C6H12} and with 2-methylbutan-2-ol {x1tert- C5H11OH + (1-x1)C6H12} have been measured at 293.15K. Using the measurement results in connection with the literature data, the following quantities have been determined: isothermal and adiabatic compressibility coefficients, βT = -1/V(∂V/∂p)T and βs = -1/V(∂V/∂p)s, respectively, the adiabatic compressibility, κs = -(∂V/∂p)s, the free intermolecular length, L, and the excess values of the molar volume, VE, of the adiabatic compressibility coefficient, &betaEs, and of the adiabatic compressibility, &kappaEs. The dependences of those excess functions on the mixture composition, expressed in mole fractions, were represented by Redlich-Kister equations.