Transfer model and kinetic characteristics of NH4+{\rm NH}_{4}^{+} –K+ ion exchange on K-ze

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• 作者：Junsheng Yuan ; Qingmin Chen and Jingkang Wang
• 关键词：K ; zeolite ; Ammonium ; Ion exchange ; Kinetics ; Mass transfer mechanism ; Mass transfer model
• 刊名：Transport in Porous Media
• 出版年：2008
• 出版时间：March, 2008
• 年：2008
• 卷：72
• 期：1
• 页码：71-82
• 全文大小：458.8 KB
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Geotechnical Engineering
  Industrial Chemistry and Chemical Engineering
  Civil Engineering
  Hydrogeology
  Mechanics, Fluids and Thermodynamics
  
• 出版者：Springer Netherlands
• ISSN：1573-1634

文摘

Based on the mass transfer theory, a new mass transfer model of ion-exchange process on zeolite under liquid film diffusion control is established, and the kinetic curves and the mass transfer coefficients of NH₄+{\rm NH}_{4}^{+} –K+ ion-exchange under different conditions were systemically determined using the shallow-bed experimental method. The results showed that the NH₄+{\rm NH}_{4}^{+} –K+ ion-exchange rates and transfer coefficients are directly proportional to solution flow rate and temperature, and inversely proportional to solution viscosity and the size of zeolite granules. It also showed that the transfer coefficient is not influenced by the ion concentrations. For a large ranges of operational conditions including temperatures (10 ? 75°C), flow rates (0.031 m s?1 ?0.26 m s?1), liquid viscosities (1.002 × 10?3 N s m?2 ? 4.44 × 10?3 N s m?2), and zeolite granular sizes (0.2 ? 1.45 mm), the average mass transfer coefficients calculated by the model agree with the experimental results very well.