Experimental determination of the isothermal (vapour+liquid) equilibria of binary aqueous solutions of sec-butylamine and cyclohexylamine at several temperatures

International audience; The vapour pressures of (sec-butylamine + water), (cyclohexylamine + water) binary mixtures, and of pure sec-butylamine and cyclohexylamine components were measured by means of two static devices at temperatures between 293 (or 273) K and 363 K. The data were correlated with the Antoine equation. From these data, excess Gibbs functions (GE) were calculated for several constant temperatures and fitted to a fourth-order Redlich-Kister equation using the Barker's method. The (cyclohexylamine + water) system shows positive azeotropic behaviour for all investigated temperatures. The two binary mixtures exhibit positive deviations in GE for all investigated temperatures over the whole composition range. Highlights Vapour pressures of sec-butylamine or cyclohexylamine and their aqueous solutions. The investigated temperatures are 273 K and 363 K. The (cyclohexylamine + water) mixture shows positive azeotropic behaviour. The (sec-butylamine + water) or (cyclohexylamine + water) exhibit positive GE.