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›› 2006, Vol. 6 ›› Issue (6): 899-902.

• 反应与分离 • 上一篇    下一篇

离子交换膜-硫酸铵溶液体系的极限电流密度

张晓燕,吕文华,丛威   

  1. 中国科学院过程工程研究所生化工程国家重点实验室
  • 出版日期:2006-12-20 发布日期:2006-12-20

The Limiting Current Density in the System of Ion-exchange Membrane and Ammonium Sulfate Solution

ZHANG Xiao-yan,LU Wen-hua,CONG Wei   

  1. State Key Lab. Biochem. Eng., Institute of Process Engineering, Chinese Academy of Sciences
  • Online:2006-12-20 Published:2006-12-20

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被引次数

15

摘要： 采用六室膜组合的膜堆研究离子交换膜-硫酸铵溶液体系的电流-电压曲线，考察了离子交换膜(JCM-15和JAM-15)-硫酸铵溶液体系中硫酸铵浓度、流速和温度对极限电流密度的影响. 实验结果表明，离子交换膜-硫酸铵溶液体系的电流-电压曲线明显有3个区域：欧姆区域、平缓增加区域和过极限电流区域. 增加硫酸铵浓度、流速和操作温度均能提高单极膜的极限电流密度. 在相同的操作条件下，阴膜(JAM-15)的极限电流密度明显高于阳膜(JCM-15). 离子交换膜-硫酸铵溶液体系的极限电流密度与流速和硫酸铵浓度的关系符合Wilson修正式，对本工作所采用的膜，ilim=17.647C0.4570V0.5725(JAM-15), ilim=13.003C0.2918V0.3697(JCM-15).

关键词: 电渗析, 离子交换膜, 电流-电压曲线, 极限电流密度, 硫酸铵

Abstract: Current-voltage curve of the system of ion-exchange membrane and ammonium sulfate solution was studied with the membrane stack of six-compartment cells. Three distinct regions were observed in the current-voltage curve of monopolar membrane and ammonium sulfate system, and the limiting current densities were obtained from the curve. The experimental results showed that the limiting current density was significantly improved with the increase of ammonium sulfate concentration, flow rate and temperature. The relationships among limiting current density, ammonium sulfate concentration and flow rate were described well by the revised Wilson formulae, ilim=17.647C0.4570V0.5725(JAM-15) and ilim=13.003C0.2918V0.3697(JCM-15), respectively.

Key words: electrodialysis, ion exchange membrane, current-voltage curve, limiting current density, ammonium sulfate