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