Experimental study on the calorimetric data of Aniline + Alkylamine (C4 and C6) at 303.15 K.

Excess molar enthalpies, H_m^E, of two binary mixtures of Aniline (ANL) + {Butylamine (BUT) or Hexylamine (HEX)} were measured over the whole range of the composition at T = 303.15 K and ambient pressure using a Parr 1455 solution calorimeter. The HmE data were negative for all systems over the whole range of composition which become less negative with increasing the chain length. The trend of the H_m^E data was interpreted in terms of the self-association of pure alkylamines, dipole–dipole interactions between ANL molecules and cross-association between unlike molecules (Aniline–alkylamine). Finally, the experimental results were correlated by the Redlich–Kister[1] equation and the two thermodynamic models (Wilson[2] and NRTL[2]) based on the local composition theory.