NaOH-NaAl(OH)4-H2O溶液体系渗透系数的测定及离子作用模型

doi:10.3969/j.issn.0251-0790.2012.01.019

高等学校化学学报 ›› 2012, Vol. 33 ›› Issue (01): 114.doi: 10.3969/j.issn.0251-0790.2012.01.019

NaOH-NaAl(OH)₄-H₂O溶液体系渗透系数的测定及离子作用模型

宋婷, 刘士军, 肖刘萍, 陈启元

中南大学化学化工学院, 长沙 410083

收稿日期:2011-05-20 出版日期:2012-01-10 发布日期:2011-12-20
通讯作者: 刘士军,男,博士,教授,主要从事化学热力学方面的研究.E-mail:liushijun@hotmail.com E-mail:liushijun@hotmail.com
基金资助:
国家自然科学基金(批准号: 20873182)资助.

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

摘要/Abstract

摘要： 用等压法测定了在303.15 K时总碱质量摩尔浓度m_NaOH(T)从0.61 mol/kg到5.72 mol/kg, 苛性比α_K从1.98到7.04的NaOH-NaAl(OH)₄-H₂O溶液体系的等压平衡浓度和渗透系数, 并得到该溶液体系的水活度. 用Pitzer模型对实验结果进行了参数化研究, 拟合求得了离子相互作用参数. 用Pitzer模型计算的渗透系数值与实验结果一致. 用获得的参数计算了NaOH和NaAl(OH)₄在NaOH-NaAl(OH)₄-H₂O溶液体系中的活度系数, 其值随总碱质量摩尔浓度的增加呈增加的趋势.

关键词: NaOH-NaAl(OH)₄-H₂O体系, 等压法, 等压平衡浓度, 渗透系数, Pitzer模型

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

中图分类号:

O642.1

TrendMD:

宋婷, 刘士军, 肖刘萍, 陈启元. NaOH-NaAl(OH)₄-H₂O溶液体系渗透系数的测定及离子作用模型. 高等学校化学学报, 2012, 33(01): 114.

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. Chem. J. Chinese Universities, 2012, 33(01): 114.

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NaOH-NaAl(OH)₄-H₂O溶液体系渗透系数的测定及离子作用模型

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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