Journal
JOURNAL OF CHEMICAL THERMODYNAMICS
Volume 94, Issue -, Pages 138-151Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jct.2015.09.026
Keywords
Pyridoxine hydrochloride; Solubility; Thermodynamics; Polarity
Categories
Funding
- Natural Science Foundation of China [NNFSC 21176173, NNSFC 21376164]
- National High Technology Research and Development Program (863 Program) [2012AA021202]
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The solubility of pyridoxine hydrochloride in binary solvent mixtures, including (acetone + water), (methanol + water) and (ethanol + water), was measured over temperature range from (278.15 to 313.15) K by a gravimetric method at atmospheric pressure (P = 0.1 MPa). The solubility increased with increasing temperature in binary solvent mixtures at constant solvent composition. Besides, the dissolving capacity of pyridoxine hydrochloride in the three binary solvent mixtures at constant temperature ranked as (methanol + water > ethanol + water > acetone + water) in general, partly depending on the polarity of the solvents. Additionally, the modified Apelblat equation, van't Hoff equation, CNIBS/R-K model and Jouyban-Acree model were used to correlate the solubility data in binary mixtures, it turned out that all the selected thermodynamic models could give satisfactory results. Furthermore, the mixing thermodynamic properties of pyridoxine hydrochloride in different binary solvent mixtures were also calculated and discussed. The results indicate that the mixing process of pyridoxine hydrochloride in the selected solvents is exothermic. (C) 2015 Published by Elsevier Ltd.
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