辽宁石油化工大学学报

辽宁石油化工大学学报 ›› 2021, Vol. 41 ›› Issue (5): 32-37.DOI: 10.3969/j.issn.1672-6952.2021.05.006

• 化学与化学工程 • 上一篇    下一篇

基于Pitzer热力学模型的高盐废水体系NaCl⁃Na2SO4⁃H2O溶解度预测

叶菊梅1(), 刘微1, 李天涯2, 李壮1(), 刘焕阳3   

  1. 1.辽宁石油化工大学 石油天然气工程学院,辽宁 抚顺 113001
    2.辽宁师范大学 化学化工学院,辽宁 大连 116029
    3.中国石油天然气股份有限公司辽宁销售仓储分公司 设备工程部,辽宁 沈阳 110000
  • 收稿日期:2020-07-30 修回日期:2020-08-25 出版日期:2021-10-25 发布日期:2021-11-09
  • 通讯作者: 李壮
  • 作者简介:叶菊梅(1996⁃),女,硕士研究生,从事固废处理、工业废盐回收等方面的研究;E⁃mail:1256423820@qq.com
  • 基金资助:
    辽宁省教育厅一般项目(L2020023)

Prediction of Solubility of NaCl⁃Na2SO4⁃H2O in High Salt Wastewater by Pitzer Thermodynamic Model

Jumei Ye1(), Wei Liu1, Tianya Li2, Zhuang Li1(), Huanyang Liu3   

  1. 1.College of Petroleum Engineering,Liaoning Petrochemical University,Fushun Liaoning 113001,China
    2.College of Chemistry and Chemical Engineering,Liaoning Normal University,Dalian Liaoning 116029,China
    3.Equipment Engineering Department,Liaoning Sales and Storage Branch of PetroChina Co. Ltd. ,Shenyang Liaoning 110000,China
  • Received:2020-07-30 Revised:2020-08-25 Published:2021-10-25 Online:2021-11-09
  • Contact: Zhuang Li

摘要:

为了研究温度为298.15 K时NaCl?Na2SO4?H2O三元体系的盐类析出规律,采用Pitzer模型预测和计算了该体系的活度系数及溶解度,分析了Na+、Cl和SO42-离子活度系数的变化规律及其对应的三元体系相图。结果表明,随着液相中Na2SO4质量分数的增加,Cl和SO42-的活度系数无明显变化,而Na+的活度系数呈先增大后下降趋势。当液相中Na2SO4质量分数小于6.8%时,Na+的活度系数上升的平均速率为4.4%;当液相中Na2SO4质量分数为6.8%~14.9%时,Na+的活度系数下降的平均速率为4.1%;当液相中Na2SO4质量分数大于14.9%时,Na+的活度系数下降速率最快,其平均值为8.0%;当液相中NaCl质量分数大于22.9%、Na2SO4质量分数小于6.8%时,随着水分的蒸发,NaCl先析出而Na2SO4后析出;当液相中NaCl质量分数为14.0%~22.9%、Na2SO4质量分数为6.8%~14.9%时,析出顺序相反。

关键词: 废盐溶液, Pitzer模型, 活度系数, 溶解度预测, 相平衡

Abstract:

In order to study the salt precipitation law of the NaCl?Na2SO4?H2O ternary system at a temperature of 298.15 K, the Pitzer model was used to predict and calculate the activity coefficient and solubility of the system, and the variation of the activity coefficients of Na+, Cl- and SO42- and the corresponding phase diagram of the ternary system were analyzed. The results show that with the increase of the Na2SO4 mass fraction, the activity coefficients of Cl- and SO42- have no obvious change, while the activity coefficient of Na+ icreases first and then decreases. When the mass fraction of Na2SO4 in the liquid phase is less than 6.8%, the average change rate of the increase in the activity coefficient of Na+ is 4.4%. When the mass fraction of Na2SO4 in the liquid phase is between 6.8% and 14.9%, the average change rate of decrease in the activity coefficient of Na+ is 4.1%, when the mass fraction of Na2SO4 in the liquid phase reaches 14.9%, the activity coefficient of Na+ decreases fastest, and the average change rate is 8.0%; when the mass fraction of NaCl in the liquid phase is greater than 22.9% and the mass fraction of Na2SO4 is less than 6.8% ,as the water evaporates, NaCl precipitates first and Na2SO4 precipitates later; when the liquid phase mass fraction of NaCl is 14.0%~22.9% and the mass fraction of Na2SO4 is 6.8%~14.9%, the precipitation order is reversed.

Key words: Waste salt solution, Pitzer model, Activity coefficient, Solubility prediction, Phase equilibrium

中图分类号: 

引用本文

叶菊梅, 刘微, 李天涯, 李壮, 刘焕阳. 基于Pitzer热力学模型的高盐废水体系NaCl⁃Na2SO4⁃H2O溶解度预测[J]. 辽宁石油化工大学学报, 2021, 41(5): 32-37.

Jumei Ye, Wei Liu, Tianya Li, Zhuang Li, Huanyang Liu. Prediction of Solubility of NaCl⁃Na2SO4⁃H2O in High Salt Wastewater by Pitzer Thermodynamic Model[J]. Journal of Liaoning Petrochemical University, 2021, 41(5): 32-37.

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