In this work, transport and thermodynamic properties of phosphoric acid/water mixtures were determined experimentally over a wide range of concentrations. Liquid binary diffusion coefficients were measured using the Taylor dispersion technique at various temperatures and concentrations. The second part of this work concerns itself with the (vapour + liquid) phase equilibrium of phosphoric acid and water up to concentrations of 105 wt% at different pressures. (C) 2013 Elsevier Ltd. All rights reserved.