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

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.