Effect of KCl and Na2SO4 on the solubility of glycine and DL-alanine in water at 298.15 K

• Type: Article in International Scientific Journal
• Date: 2005

Authors

L. A. Ferreira (Author) FEUP; Eugénia A. Macedo (Author) FEUP; Simão P. Pinho (Author) FEUP

Journal

Title: Industrial & Engineering Chemistry Research

Vol. 44

Pages: 8892-8898

ISSN: 0888-5885

Publisher: American Chemical Society

Indexing

ISI Web of Knowledge - 59 Citations

ISI Web of Science

Scopus - 63 Citations

Scientific classification

FOS: Engineering and technology > Chemical engineering

Other information

Authenticus ID: P-000-0H3

DOI: 10.1021/ie050613q

Abstract (EN): The solubility of glycine and DL-alanine in aqueous systems of KCl and Na2SO4 at 298.15 K was measured at different salt concentrations using the analytical gravimetric method. The experimental data obtained in this work and those previously reported in the literature for the same systems were compared, and it was possible to show a big discrepancy for the waterKCl-amino acid systems and a very satisfactory agreement for the water-Na2SO4-amino acid systems. The solubility data from this work and the activity coefficients data from literature were used to explore the potentialities of the Pitzer-Simonson-Clegg equations for the thermodynamic description of the ternary systems water-KCl with glycine or DL-alanine at 298.15 K. This model, with five adjustable parameters, gives a global root-mean-square deviation of 0.0036 for the correlation of the activity coefficients and 0.63 g/(kg of water) for the solubility in those ternary systems.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7