期刊
JOURNAL OF CHEMICAL THERMODYNAMICS
卷 68, 期 -, 页码 1-12出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jct.2013.08.018
关键词
Osmotic coefficients; Solubility; Electrolyte solutions; Equation of state; ePC-SAFT; Salt influence
资金
- DECHEMA [16295 N/1]
- Federal Ministry of Economics and Technology based on an enactment of the German Federal Parliament (BMWi)
In this work thermodynamic properties of electrolyte/amino acid/water solutions were measured and modeled. Osmotic coefficients at 298.15 K were measured by means of vapor-pressure osmometry. Amino-acid solubility at 298.15 K was determined gravimetrically. Considered aqueous systems contained one of the four amino acids: glycine, L-/DL-alanine, L-/DL-valine, and L-proline up to the respective amino-acid solubility limit and one of 13 salts composed of the ions Li+, Na+, K+, NH4+, Cl , Br, I , NO3 and SO42 at salt molalities of 0.5, 1.0, and 3.0 mol.kg(-1), respectively. The data show that the salt influence is more pronounced on osmotic coefficients than on amino-acid solubility. The electrolyte Perturbed-Chain Statistical Association Theory (ePC-SAFT) was applied to model thermodynamic properties in aqueous electrolyte/amino-acid solutions. In previous works, this model had been applied to binary salt/water and binary amino acid/water systems. Without fitting any additional parameters, osmotic coefficients and amino-acid solubility in the ternary electrolyte/amino acid/water systems could be predicted with overall deviations of 3.7% and 9.3%, respectively, compared to the experimental data. (C) 2013 Elsevier Ltd. All rights reserved.
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