Honeycomb-carbon-fiber-supported amine-containing nanogel particles for CO2 capture using a rotating column TVSA

Abstract

Amine-containing nanogel particles as promising absorbents have been developed to reversibly uptake and release CO2 at a low regeneration temperature (75 °C), which is an efficient way to limit the degradation and volatility of amine. It is extremely important to explore a suitable CO2 capture process for further scale-up and industrial application. Herein, a temperature vacuum swing adsorption process for post-combustion CO2 capture from flue gas, using honeycomb-carbon-fiber-supported amine-containing nanogel particles in a rotating column was proposed. The corresponding models for CO2 adsorption and recovery were established and developed based on CO2 adsorption equilibrium experimental data. Two different process configurations were compared and optimized for a specified CO2 purity, recovery, productivity, and energy consumption. The effect of the feed gas CO2 concentration on the aforementioned performance indicators was investigated independently. Simulated results indicate that the cycling of concentrated CO2 in the desorption section can be used to improve the CO2 purity, which is almost independent of the feed gas CO2 concentration. However, it would be decreased when the purge gas combined with concentrated CO2 was recycled in the desorption section, especially for lower CO2 concentration of the feed gas. The performance indicators for 12% CO2 in terms of CO2 purity, productivity, recovery, and energy consumption were optimized to be 99.5%, 0.622 kg/(kg·h), 93.4%, and 567 kJ/kg CO2, respectively, indicating that the rotating honeycomb column with the temperature vacuum swing adsorption process can be a promising post-combustion CO2 capture technology.