Thermodynamics of molecular association in binary methanol solutions

Abstract

This paper deals with isothermal total vapour pressure measurements on methanol (B)+pyridine (A), methanol (B)+β-picoline (A), methanol (B)+N,N-dimethylformamide (A) over the whole range of composition at 303.15 K and the excess Gibbs free energies are evaluated. The data have been analysed in terms of a r-mer-r-mer model of interaction. The equilibrium constants for the various association reactions are evaluated and the enthalpy changes ΔH°_l involved in the AB_x and A₂B molecular species of A and B have also been computed.