Volume 56

Study on the regeneration performance of alcoholamine absorbent for CO2 capturing assisted by electric field Ziheng Zhang, Rezeye·Rehemituli, Jingmao Wang, Xuemei Yang, Fan Yang, Junwei Hou

Abstract

The traditional alcoholamine CO2 capture method requires a desorption temperature of 120 °C, which is energy-intensive and costly; the study of a CO2 capture method with low energy consumption and low cost is the key to realising the CCUS. In this paper, based on the alcoholamine chemical absorption method of CO2, N-methyldiethanolamine (MDEA) solution was used as the CO2 capture absorbent, and its desorption performance was compared between the traditional heating and the electric field-assisted action, so as to investigate the enhancement effect of the electric field-assisted action on the rich-liquid regeneration and desorption of the alcoholamine absorbent under different conditions. The optimum reaction conditions and the maximum desorption rate of the electric field-assisted desorption were explored by changing the experimental factors such as voltage and temperature. The results showed that at the desorption temperature of 105 °C, the desorption rate of conventional heating was only 55.18%; when the desorption temperature was still 105 °C but with the addition of 4.5 V voltage assistance, the desorption rate could reach 97.92%; It has better cyclic regeneration performance, with a 1% decrease in CO2 desorption after 5 cycles. By comprehensively comparing the desorption performance of organic amine desorption of CO2 under the conditions of traditional heating and electric field-assisted heating, it can be seen that the appropriate low-voltage electric field has a promotional effect on the desorption of CO2 from alcoholamine solution, and the development of this technology is of great significance to effectively improve the regeneration efficiency of carbon capture absorbents and reduce the energy consumption in the process of CO2 desorption.

Keywords Alcoholamine absorbent, Carbon capture, Electric field, Regeneration