Sub-ambient Pressure Swing Adsorption for CO2Capture
As the economics of a membrane-based process have already been
considered in some detail in the work of Hasse et
al,26,27 it is interesting to explore the performance
of a PSA separation in the sub-ambient capture process. A simple
four-step cycle for heavy-product recovery (pressurization, feed,
blowdown, and evacuation) was considered for baseline performance. For
preliminary analysis of the economics of CO2 capture, we
assumed a 2-bed system with a 360 s cycle time (180 s on pressurization
and feed, 180 s on blowdown and evacuation), and PSA productivity of
0.0138 molCO2 kgsorb-1sec-1.