A New Multi-bed Vacuum Swing Adsorption Cycle for CO2 Capture from Flue Gas Streams

Abstract

Adsorption Processes for CO2 capture have been extensively researched within the last decade and have been piloted at many field installations and in research laboratories. Many reported VSA cycle designs for CO2 capture are based on single- and dual- adsorbent beds. The performance of such cycles is typically poor due to the lack of room to incorporate more relevant auxiliary intermediate process steps such as pressure equalization, co-current purge, etc. Very low vacuum pressures (< 3kPa) are therefore necessary to achieve higher CO2 purity. This is difficult and expensive to provide at large scale. To address this concern, a new 4-bed PVSA cycle has been developed in our laboratory and te..