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The solubility of 1,1-diamino-2,2-dinitroethylene (FOX-7) was measured by using a laser monitoring system in binary (N-methyl pyrrolidone + acetone, ethanol, water) mixed solvents with temperatures changing from 293.15 K to 333.15 K under 0.1 MPa. The experimental solubility data for FOX-7 were correlated and fitted to thermodynamic models such as van’t Hoff model, modified Apelblat model, and Yaws model. The results show that the solubility of FOX-7 increases with increasing temperature and N-methyl pyrrolidone ratio. Three models can be used to correlate the solubility data commendably. However, the Yaws model fits best for the solvent system selected in this work. At last, the standard dissolution enthalpy, standard dissolution entropy, and standard Gibbs free energy of FOX-7 can be calculated. It was found that the dissolution of FOX-7 in all test solvents was endothermic and non-spontaneous.

Solubility and thermodynamics properties of FOX-7 in binary (N-methyl pyrrolidone + acetone, ethanol, water) mixed solvents