(704c) Thermal Swing Sorption Process for CO2 Capture from Flue Gas

A variety of sorbents are being used in packed beds for CO₂ capture from flue gas. The bed is regenerated by thermally stripping CO₂ in a cyclic process. The sorbent capacity is highly relevant. The higher the sorption capacity, the lower is the energy requirement for CO₂ capture and recovery. The highest values of the CO₂ sorption capacity in published literature are between 2.5 and 3 mmol/g of the sorbent. We have developed a novel sorbent having a capacity of as much as 6.3-7 mmol/g of the sorbent and determined its selectivity with respect to N₂. We have studied the sorption and desorption behavior of the packed bed with flue gas in a cyclic process. Experimental results will be presented and discussed. Membranes are of special use in such a process.