Journal of Chemical and Engineering Data, Vol.65, No.1, 209-216, 2020
Experimental Determination and Thermodynamic Correlation of 7-Amino-4-Methylcoumarin Solubility in Various Cosolvency Mixtures at (278.15-323.15) K
Four solvents (ethanol, isopropanol, ethylene glycol (EG), and N,N-dimethylformamide (DMF)) that can be mixed with water in any ratio were selected to determine the dissolution performance of 7-amino-4-methylcoumarin by the classical shake-flask method. The measured temperature range began at 278.15 K and ended at 303.15 K, and the pressure environment was controlled at standard atmospheric pressure (101.1 kPa). Results reveal that with the addition of organic solvents, the solubilization effect of 7-amino-4-methylcoumarin was very significant and the larger the amount of addition, the more obvious was the effect of solubilization. Not only that, the temperature change had a non-negligible effect on the dispersion of 7-amino-4-methylcoumarin; the temperature increased monotonically, and the better was the dissolution. When the external conditions were kept constant, the addition of DMF made the solubilization effect of 7-amino-4-methylcoumarin most obvious among all organic solvents used. This study involved three models, including the Jouyban-Acree model and its two variants (van't Hoff-Jouyban-Acree model and Apelblat-Jouyban-Acree model), which were used to correlate the solubility data of 7-amino-4-methylcoumarin in aqueous cosolvent mixtures. The relative average deviation (RAD) and root-mean-square deviation (RMSD) reaches to 3.47 x 10(-2). and 1.79 x 10(-3) rooting in the van't Hoff-Jouyban-Acree model. The relevant parameters obtained through model calculation and experimental means are essential for product synthesis, separation, and purification processes.