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›› 2002, Vol. 2 ›› Issue (3): 0-0.

• 3 •    

Measurement and Correlation of Liquid–Liquid Equilibrium Data for Ethanol–Water–KF and Ethanol–Water–K2CO3 Systems

XU Wen-you(许文友),YUAN Xi-gang(袁希纲)   

  1. 1. Macromolecule Sci. & Eng. Key Lab., Yantai University, Yantai, Shandong 264005, China; 2. Chemical Engineering Research Center, Tianjin University, Tianjin 300072, China
  • 出版日期:2002-06-20 发布日期:2002-06-20

Phase Equilibrium of the Quaternary K2SO4–(NH4)2SO4–CO(NH2)2–H2O System at 25oC

ZHANG Yong-jie1, CAO Ji-lin1, LI Lin2, REN Bao-shan1   

  1. . Macromolecule Sci. & Eng. Key Lab., Yantai University, Yantai, Shandong 264005, China; 2. Chemical Engineering Research Center, Tianjin University, Tianjin 300072, China
  • Online:2002-06-20 Published:2002-06-20

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摘要： The liquid–liquid equilibrium data for two ternary systems, ethanol–water–KF and ethanol– water–K2CO3, were determined at 25℃. Experiments show that by adding KF or K2CO3 into the ethanol–water system two phases are formed: an ethanol-rich phase with negligible salt and a water-rich phase with negligible ethanol, thus water can be separated out easily. A mathematical calculation of the liquid–liquid equilibrium data was carried out with the Pitzer theory on water activity in the aqueous phase, and with the Wilson or NRTL or UNIQUAC equations for that in the ethanol phase, which is in good agreement with experimental data.

关键词: ethanol–water–KF, ethanol–water–K2CO3, liquid–liquid equilibrium, Pitzer theory, Wilson equation, NRTL equation, UNIQUAC equation

Abstract: The liquid–liquid equilibrium data for two ternary systems, ethanol–water–KF and ethanol– water–K2CO3, were determined at 25oC. Experiments show that by adding KF or K2CO3 into the ethanol–water system two phases are formed: an ethanol-rich phase with negligible salt and a water-rich phase with negligible ethanol, thus water can be separated out easily. A mathematical calculation of the liquid–liquid equilibrium data was carried out with the Pitzer theory on water activity in the aqueous phase, and with the Wilson or NRTL or UNIQUAC equations for that in the ethanol phase, which is in good agreement with experimental data.

Key words: potassium sulfate, ammonium sulfate, urea, phase equilibrium, activity coefficient

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