SCI和EI收录∣中国化工学会会刊

›› 2010, Vol. 18 ›› Issue (4): 538-543.

• SEPARATION SCIENCE AND ENGINEERING • Previous Articles     Next Articles

Electrolytic Regeneration of Decarbonising Potassium Carbonate Solution

LIU Na, ZHAO Xinglei, WANG Yundon, FEI Weiyang   

  1. State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
  • Received:2009-12-08 Revised:2010-03-29 Online:2010-08-28 Published:2010-08-28

Electrolytic Regeneration of Decarbonising Potassium Carbonate Solution

刘娜, 赵兴雷, 王运东, 费维扬   

  1. State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
  • 通讯作者: WANG Yundong, E-mail:wangyd@tsinghua.edu.cn
  • 基金资助:
    Supported by the Specialized Research Fund for Doctoral Programme of Higher Education of MOE(200700033154,200800030095);the National Natural Science Foundation of China(20836008)

Abstract: In this work,the regeneration mechanism of potassium carbonate solution after absorption of CO2 using ion-exchange membrane electrolysis was presented.The solutions of potassium carbonate (K2CO3) and potassium bicarbonate (KHCO3) were used to simulate the solution after absorbing CO2.Experiments were carried out at various electrodes,temperatures and current densities.The results indicate that the membrane electrolysis can in-crease concentration ratio of K2CO3 and KHCO3,and achieve 100% conversion.In thisprocess,not only CO2 is desorbed from carbonate solution,but also hydrogen,as a byproduct,is generated at the cathode,which is the main contributor to reduce energy consumption.Thus,the membrane electrolysis is valuable in the regeneration of the K2CO3 absorbent.

Key words: membrane electrolysis, Benfield, regeneration, carbon dioxide

摘要: In this work,the regeneration mechanism of potassium carbonate solution after absorption of CO2 using ion-exchange membrane electrolysis was presented.The solutions of potassium carbonate (K2CO3) and potassium bicarbonate (KHCO3) were used to simulate the solution after absorbing CO2.Experiments were carried out at various electrodes,temperatures and current densities.The results indicate that the membrane electrolysis can in-crease concentration ratio of K2CO3 and KHCO3,and achieve 100% conversion.In thisprocess,not only CO2 is desorbed from carbonate solution,but also hydrogen,as a byproduct,is generated at the cathode,which is the main contributor to reduce energy consumption.Thus,the membrane electrolysis is valuable in the regeneration of the K2CO3 absorbent.

关键词: membrane electrolysis, Benfield, regeneration, carbon dioxide