1. Solubility measurement and correlation of 2-aminoterephthalic acid in eight alcoholic solvents at different temperatures
- Author
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Eunhye Choi and Philippe M. Heynderickx
- Subjects
MELTING-POINTS ,PREDICTION ,Van’t Hoff equation ,2-Aminoterephthalic acid ,PURE SOLVENTS ,Atomic and Molecular Physics, and Optics ,Chemistry ,EQUILIBRIUM ,Solubility ,Solution thermodynamics ,General Materials Science ,λh equation ,ETHANOL PLUS WATER ,THERMODYNAMIC PROPERTIES ,Physical and Theoretical Chemistry ,KAT-LSER model ,MOLECULAR-STRUCTURE - Abstract
This research experimentally measured the solubility of 2-aminoterephthalic acid in eight pure alcoholic solvents - methanol, ethanol, 1-propanol, 1-butanol, 2-propanol, 2-butanol, 2-methyl-2-propanol, and 3-methyl-1-butanol - from 303.15 to 338.15 K at normal pressure p = 0.1 MPa by the excess solid method. The measured solubility of 2-aminoterephthalic acid in these pure organic solvents was found to increase with the rise of temperature in the following order: 3-methyl-1-butanol (lowest solubility) < 1-butanol < 2-butanol < 1-propanol < 2-methyl-2-propanol approximate to 2-propanol < ethanol < methanol (highest solubility). The experimental solubility was correlated by the Van't Hoff equation and the lambda h (Buchowski) equation. The apparent thermo-dynamic properties (Delta 0Gsol, Delta 0Hsol and Delta 0Ssol) were calculated by the Van't Hoff equation, from which it was concluded that the dissolution process is entropy-motivated and endothermal. In addition, the solvent effects on 2-aminoterephthalic acid solubility were studied by the KAT-LSER model, where the results showed that the polarizability accounts for 47.9 +/- 4.2 % of the total solvent effect.A volcano-type relation between the dissolution entropy and enthalpy versus the solvent boiling point is re-ported, showing maximal values of 55.3 J mol-1 K-1 and 29.2 kJ mol-1, respectively, for intermediate molecular interactions of solute and solvent.
- Published
- 2023