Solubility determination and correlation of cyromazine in sixteen pure solvents and mixing properties of solutions

were measured by a laser dynamic method under atmospheric pressure. The experimental results show that the mole fraction solubility of cyromazine in the sixteen pure solvents decreased according to the following order: acrylic acid > acetic acid > propanoic acid > methanol > ethanol ≈ water > 1-propanol > 1-butanol >1-pentanol >1-hexanol > 1-heptanol > 3-methyl-1-butanol ≈ (2-propanol, 2-butanol, isobutanol and acetone). In order to facilitate industrial application (to improve the purity of cyromazine by crystallization in industry) and other research studies, the experimental solubility data are correlated with the five thermodynamic models: modified Apelblat equation, λh equation, non-random two liquid (NRTL) model equation, Wilson model equation and van't Hoff equation. Moreover, the mixing Gibbs energy (ΔmixG), mixing entropy (ΔmixS), mixing enthalpy (ΔmixH), activity coefficient (γ1∞) at infinitesimal concentration and reduced excess enthalpy (H1E,∞) were obtained and the mixing process of cyromazine in the selected solvents are evaluated based on the Wilson model. The relatively close values of γ1∞ and γ1 indicated that the cyromazine -selected solvents solution systems are not highly non-ideal.