SEPARATION OF CARBON-DIOXIDE BY PRESSURE SWING ADSORPTION USING GRANULAR MOLECULAR-SIEVING CARBON

Using granular molecular sieving carbon (MSC) produced from polyvinyl alcohol (PVA)/phenolic resin, measurements of adsorption equilibria an d adsorption rates of single-component systems of N2 and CO2 were carr ied out. The amount of CO2 adsorbed on the MSC was larger than that of N2 at equilibrium, and the MSC had a higher diffusivity ratio of CO2 to N2 than did the active carbon. In addition, an experiment on CO2 se paration from a mixed gas of N2/CO2/H2O by the pressure swing adsorpti on (PSA) method using the MSC was carried out. The following results w ere obtained. 1) CO2, of which the concentration was 15 vol. %, was co ncentrated to a maximum value of 68 vol. % under a CO2 yield of more t han 0.96. There was no significant effect of water vapor content in th e feed gas on the CO2 separation capabilities. 2) The adsorption cycle time and the waste gas flow rate significantly affected CO2 separatio n by the PSA method. The temperature changes in an adsorption column s upported this conclusion.