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›› 2011, Vol. 11 ›› Issue (3): 436-441.

• 过程与工艺 • 上一篇    下一篇

双极膜电渗析再生酸碱过程中的阴膜漏氢研究

王倩 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 中国科学院过程工程研究所生化工程国家重点实验室
  • 收稿日期:2011-03-21 修回日期:2011-04-08 出版日期:2011-06-20 发布日期:2011-06-20
  • 通讯作者: 王倩

Proton Leakage through Anion-exchange Membranes in Bipolar Membrane Electrodialysis Process

ZHANG Li-ye, CONG Wei   

  1. State Key Lab. Biochem. Eng., Institute of Process Engineering, Chinese Academy of Science State Key Lab. Biochem. Eng., Inst. Process Eng., CAS
  • Received:2011-03-21 Revised:2011-04-08 Online:2011-06-20 Published:2011-06-20
  • Contact: ZHANG Li-ye,

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被引次数

29

摘要： 对3种阴离子钠盐三室双极膜电渗析再生酸碱过程中的酸室漏氢现象进行了研究. 结果表明，NaCl和Na2SO4双极膜电渗析过程中始终存在阴膜H+泄漏现象，而C6O7H5Na3阳膜OH-泄漏与阴膜H+泄漏先后发生. 3种钠盐漏氢程度顺序为Na2SO4>NaCl>C6O7H5Na3. 漏氢导致盐室溶液pH值下降，Na2SO4盐室pH值降幅达3.02, Na2SO4再生酸和碱的平均电流效率分别仅为C6O7H5Na3的38.4%和48.2%，能耗则为C6O7H5Na3的1.68和1.36倍. 造成阴膜漏氢的根本原因是盐室中成盐阴、阳离子迁移速度不同，缓解漏氢的关键在于强化阴离子的迁移.

关键词: 双极膜电渗析, 钠盐, 阴离子交换膜, 漏氢, 离子迁移, 电离平衡

Abstract: Proton (H+) leakage through anion-exchange membranes in bipolar membrane electrodialysis (BMED) process with three sodium salts was investigated. The results indicated that the proton leakage occurred during the whole BMED process with NaCl and Na2SO4 and caused the decrease of 3.02 in pH value of salt solution for Na2SO4 while the proton leakage and hydroxyl leakage successively occurred during the process with C6O7H5Na3. The proton leakage increased in the following sequence of Na2SO4>NaCl>C6O7H5Na3. As a result, compared with C6O7H5Na3, the average current efficiency of acid and base regeneration for Na2SO4 decreased 61.6% and 51.8%, but the energy consumption increased 67.8% and 36.2%, respectively. Based on the results, it was assumed that the unequal transport velocity between cations and anions was responsible for the proton leakage. The key to decrease the proton leakage was to accelerate the migration of anions.

Key words: bipolar membrane electrodialysis, sodium salt, anion-exchange membrane, proton leakage, ion transport, charge balance

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