Isothermal Evaporation Process Simulation Using the Pitzer Model for the Quinary System LiCl鈥揘aCl鈥揔Cl鈥揝rCl2鈥揌2O at 298.15 K

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• 作者：Lingzong Meng ; Miroslaw S. Gruszkiewicz ; Tianlong Deng ; Yafei Guo ; Dan Li
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2015
• 出版时间：August 26, 2015
• 年：2015
• 卷：54
• 期：33
• 页码：8311-8318
• 全文大小：399K
• ISSN：1520-5045

文摘

The Pitzer thermodynamic model for liquid鈥搒olid equilibrium in the quinary system LiCl鈥揘aCl鈥揔Cl鈥揝rCl₂鈥揌₂O at 298.15 K was constructed by selecting the proper parameters and standard chemical potential. The solubility data and water activity data of the systems SrCl₂鈥揌₂O, NaCl鈥揝rCl₂鈥揌₂O, KCl鈥揝rCl₂鈥揌₂O, LiCl鈥揝rCl₂鈥揌₂O, and NaCl鈥揔Cl鈥揝rCl₂鈥揌₂O were used to evaluate the model. Good agreement between the calculated and experimental solubility data indicates that the model is reliable. The Pitzer model for the above system at 298.15 K was then used to calculate the component solubilities and conduct computer simulation of isothermal evaporation of the mother liquor for the oilfield brine in Nanyishan region of Qaidam Basin (China). The evaporation-crystallization route and order of salt precipitation, changes in concentration and precipitation of lithium, sodium, potassium, and strontium, and water activities during the evaporation process were demonstrated. The salts crystallized from the brine in the order: KCl, NaCl, SrCl₂路6H₂O, SrCl₂路2H₂O, and LiCl路H₂O. The entire evaporation鈥揷rystallization process may consist of six stages. In each stage, the variation trends for the relationships between ion concentrations or water activities and the evaporation ratio are different. This result of the simulation of brines can be used as a theoretical reference for comprehensive exploitation and utilization of this type of brine resources.