Equilibrium solubility of pure and mixed 3,5-dinitrobenzoic acid and 3-nitrobenzoic acid in supercritical carbon dioxide

► We measure the solubility of 3,5-dinitrobenzoic acid and 3-nitrobenzoic acid. ► We observe the effect of solubility enhancement in the ternary system. ► We investigate the mixture separation factor and the separation efficiency. ► We propose a modified Kumar-Johnston model to correlate the solubility data. ► The new proposed model correlates the solubility data in good accuracy.