(164b) Adsorption Of Carbon Dioxide And Nitrogen On Carbonaceous Sorbents

Experimental sorption of CO2 and N2 up to 10 bar and up to 130°C on carbon-rich (carbonaceous) sorbents greatly depends on the properties of the sorbent material. In general, the CO2/N2 sorption selectivity is not very sensitive to temperature, but it decreases with increasing pressure. This suggests that an isobaric thermal recovery is a more efficient approach than an isothermal pressure-swing recovery. The CO2 sorption and desorption rates are found to be high. The time needed for the carbonaceous sorbents to become saturated with CO2 varies from about 15 to 45 minutes, and it is not very sensitive to temperature and pressure. The temperature cycles do not affect the CO2 sorption capacity, its rate, and the CO2/N2 sorption selectivity. These sorption characterization data are used to design a low-pressure carbon filter for removing CO2 from flue gas and other gas mixtures.