Vapour–liquid equilibrium of propanoic acid+water at 423.2, 453.2 and 483.2K from 1.87 to 19.38bar. Experimental and modelling with PR, CPA, PC-SAFT and PCP-SAFT

摘要: Abstract Vapour–liquid equilibrium data were measured for the propanoic acid + water system at 423.2, 453.2 and 483.2 K from 1.87 to 19.38 bar over entire range of concentrations. An experimental apparatus based on static–analytical method with sampling both phases was used quantitative analysis by GC. The is highly non-ideal showing azeotropic behaviour. Peng–Robinson (PR), cubic plus association (CPA), perturbed chain statistical associating fluid theory (PC-SAFT) PC-polar-SAFT (PCP-SAFT) equations state modelled data. Two sites assumed compounds. A single–binary interaction parameter (kij) in all models, predictive ( k i j = 0 ) correlative + 1 T capabilities assessed. Available 313.1, 343.2 373.1 K open literature included analysis. PCP-SAFT presented higher temperature range. PC-SAFT mode not able represent behaviour but resulted second best correlations. CPA a satisfactory balance between two modes. PR predictions rather poor correlations better than those CPA, expense larger kij.