Modeling for tungstic precipitation and extraction based on Pitzer equation
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- 作者：Xinyue Zhang ; Pengge Ning ; Weifeng Xu ; Hongbin Cao ; Yi Zhang
- 关键词：tungstic precipitation ; Pitzer parameter ; activity coefficient ; extraction
- 刊名：SCIENCE CHINA Chemistry
- 出版年：2016
- 出版时间：April 2016
- 年：2016
- 卷：59
- 期：4
- 页码：497-504
- 全文大小：750 KB
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Pengge Ning (2)
Weifeng Xu (2)
Hongbin Cao (2)
Yi Zhang (1) (2) (3)
1. School of Chemical Engineering and Technology, National Engineering Research Center of Distillation Technology, Tianjin University, Tianjin, 300072, China
2. Research Centre for Process Pollution Control, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China
3. Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072, China - 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Chinese Library of Science
Chemistry - 出版者：Science China Press, co-published with Springer
- ISSN：1869-1870
文摘
This work presented the results of tungstic precipitation from Na2WO4-Na2SO4-H2O system at 293.15 K, with which the Pitzer parameters of \(\beta _{N{a_2}W{O_4}}^{\left( 0 \right)}\) and \(\beta _{N{a_2}W{O_4}}^{\left( 1 \right)}\) were determined from Pitzer equation by regression. Thus the mean ionic activity coefficients of sodium tungstate were calculated. The obtained \(\beta _{N{a_2}W{O_4}}^{\left( 0 \right)}\) and \(\beta _{N{a_2}W{O_4}}^{\left( 1 \right)}\) were substituted as fixed values in extraction modeling from Na2WO4-H2SO4-H2O system by primary amine (N1923) in toluene as diluent. Meanwhile the activity coefficient expressions in organic phase were varied based on Pitzer theory that the interaction term for the solvent should not be included. The Pitzer parameters for organic phase were re-regressed in order to make the model more accurate. The average absolute relative deviation (AARD) for calculated and experimental molality of WO 4 2− in aqueous phase was 5.24%. The results showed that the model can not only correlate but also predict the liquid-liquid equilibrium (LLE) data.