The solubility of 2-chloro-N-(4-methylphenyl)propanamide (S1) in ethyl acetate + hexane mixtures between the temperatures of 273.43 to 327.67 K, in toluene + hexane mixtures from 273.24 to 331.62 K, in acetone + hexane mixtures from 269.81 to 318.8 butanone + hexane mixtures between 267.10 and 322.92 were determined using the polythermal method. In situ focused beam reflectance measurement (FBRM) was used to characterize the dissolution properties and to provide S1s saturation temperature profile as a function of concentration. It was demonstrated that the solubility of S1 increases with increasing temperature at constant solvent composition. The experimental solubility data were correlated using Apelblat, lambda h, and phase equilibria with NRTL (nonrandom two liquid) model equations, and the predicted solubility data obtained agree sufficiently with the experimental data based on the relative deviation (RD%) and average relative deviation (ARD%) values. The Apelblat and lambda h model equation provides a convenient operational model of engineering interest to calculate the solubility of S1 quickly and easily, although it does not take the solvent composition into account, therefore needing separate parameters for each different solvent compositions. Therefore, the phase equilibria with NRTL model equation is used to provide a more comprehensive model that illustrates the effect of solvent composition on the solubility more apparently. One general set of NRTL parameters has the capability of describing all solvent compositions. Additionally, the melting temperature, T-m and the molar fusion enthalpy, Delta H-fus, (394.83 K and 26.77 kJ mol(-1) respectively) of S1 were determined by differential scanning calorimetry (DSC).