Determination of Osmotic Coefficients and Representation with Ion-interaction Model for NaOH-NaAl(OH)4-H2O System at 303.15 K

doi:10.3969/j.issn.0251-0790.2012.01.019

Chem. J. Chinese Universities ›› 2012, Vol. 33 ›› Issue (01): 114.doi: 10.3969/j.issn.0251-0790.2012.01.019

• Physical Chemistry • Previous Articles Next Articles

Determination of Osmotic Coefficients and Representation with Ion-interaction Model for NaOH-NaAl(OH)₄-H₂O System at 303.15 K

SONG Ting, LIU Shi-Jun, XIAO Liu-Ping, CHEN Qi-Yuan

College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China

Received:2011-05-20 Online:2012-01-10 Published:2011-12-20
Contact: LIU Shi-Jun E-mail:liushijun@hotmail.com

Abstract

Abstract: The isopiestic equilibrium molalities and the osmotic coefficients for the NaOH-NaAl(OH)₄-H₂O system were measured using isopiestic method. At 303.15 K with the total alkli molality from 0.61 mol/kg to 5.72 mol/kg and molar ratio of Na₂O to Al₂O₃(α_K) from 1.98 to 7.04. The experimental data were represented by the Pitzer model. The Pitzer ion interaction parameters were evaluated from experimental data using multiple regression. The measured data of osmotic coefficients are in reasonable agreements with those calculated by the model. The activity coefficients of NaOH and NaAl(OH)₄ in the system were calculated from the ion interaction model parameterized, and the values increased with the total alkli molality increasing. These studies are useful to improve the thermodynamic model for sodium aluminate solutions systems and sodium aluminosilicate solutions systems.

Key words: NaOH-NaAl(OH)₄-H₂O system, Isopiestic method, Isopiestic equilibrium molality, Osmotic coefficient, Pitzer model

CLC Number:

O642.1

TrendMD:

SONG Ting, LIU Shi-Jun, XIAO Liu-Ping, CHEN Qi-Yuan. Determination of Osmotic Coefficients and Representation with Ion-interaction Model for NaOH-NaAl(OH)₄-H₂O System at 303.15 K[J]. Chem. J. Chinese Universities, 2012, 33(01): 114.

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Determination of Osmotic Coefficients and Representation with Ion-interaction Model for NaOH-NaAl(OH)₄-H₂O System at 303.15 K

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