高等学校化学学报

高等学校化学学报 ›› 1993, Vol. 14 ›› Issue (3): 382.

• 研究论文 • 上一篇    下一篇

UNIFAC方程用于H2O-n-C12H26-D2EHPA-LaCl3-HCl萃取体系

陈健, 丛威, 李总成, 李以圭   

  1. 清华大学化学工程系, 北京 100084
  • 收稿日期:1992-02-10 修回日期:1992-12-01 出版日期:1993-03-24 发布日期:1993-03-24
  • 通讯作者: 陈健

An Application of UNIFAC Equation to H2O-n-C12H26-D2EHPA-LaCl3-HCl Extraction System

CHEN Jian, CONG Wei, LI Zong-Cheng, LI Yi-Gui   

  1. Department of Chemical Engineering, Tsinghua University, Beijing, 100084
  • Received:1992-02-10 Revised:1992-12-01 Online:1993-03-24 Published:1993-03-24

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摘要： 本文实验测定了n-C12H26-D2EHPA在盐酸介质中萃取La3+的平衡数据和H2O-n-C12H26D2EHPA体系的活度系数.用Pitzer方程计算水相中H2O和H+、La3+的活度系数,用UNIFAC方程计算有机相各组分的活度系数,提出了萃取剂和金属萃合物的基因划分方法,经数据拟合,获得了能在全浓度范围内适用的萃取反应平衡常数和UNIFAC参数,用这些参数成功计算了n-C12H26-D2EHPA萃取La3+的平衡浓度.

关键词: 溶剂萃取, 热力学, UNIFAC方程, Pitzer方程, 镧的萃取

Abstract: The liquid-liquid equilibrium data for H2O-n-C12H26-D2EHPA-LaCl3-HCl extraction system were determined.The partial pressures of n-C12H26 in LLEfor H2O-n-C12H26-D2EHPAwere measured by gas chromatography with hydrogen flame detector.The Pitzer equation is used to calculate the activity of water and the individual ionic activity coefficients of H+ and La3+ in aqueous phase.The U-NIFACequation is used to calculate the activity coefficients of components in organic phase.Amethod to divide the extractant and metal organic complex into functional groups is proposed.By regression of the experimental data, the equilibrium constant of the extraction reaction and the UNIFACgroup interaction parameters were obtained, which can be used in the whole concentration range.The equilibrium concentration of lathanum in this system can be calculated successfully.

Key words: Solvent extraction, Thermodynamics, UNIFAC equation, Pitzer equation, Extraction of lathanum

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