Solubility Determination and Thermodynamic Modeling of Glutaric Anhydride in Diverse Solvent Systems Consisting of Acetic Acid, Ethanoic Anhydride, and Tetrachloromethane from T = (278.45 to 324.45) K

摘要

The solid-liquid equilibrium (SLE) of glutaric anhydride in three pure solvents, tetrachloromethane, acetic acid and ethanoic anhydride, and three binary solvents of acetic acid + tetrachloromethane, ethanoic anhydride + (tetrachloromethane/acetic acid) and a ternary solvent of tetrachloromethane + acetic acid + ethanoic anhydride solvent systems was measured by dynamic method at a temperature range from 278.45 K to 324.45 K under atmospheric pressure. It turns out that the solubility of glutaric anhydride increases with the temperature increasing in all selected solvents. Moreover, it is interesting that the solubility of glutaric anhydride in two binary solvents (acetic acid + tetrachloromethane, ethanoic anhydride + tetrachloromethane) and ternary solvents mixtures (tetrachloromethane + acetic acid + ethanoic anhydride) was affected more by the decrease of mass fraction of tetrachloromethane at a given temperature. The mass fraction of added ethanoic anhydride had a smaller effect on the solubility of glutaric anhydride in the binary solvent of ethanoic anhydride + acetic acid at T = (279.45 to 314.45) K The experimental data of solubility were correlated by the lambda h equation, the Apelblat equation, and nonrandom two liquid equation. All equations can be well applied, and the relative average deviation of the Apelblat equation is less than 0.05. In addition, the thermodynamic properties of the mixing processes in all selected solvents were calculated and discussed based on the non-random two-liquid model.