S. Sircar et Tc. Golden, ISOTHERMAL AND ISOBARIC DESORPTION OF CARBON-DIOXIDE BY PURGE, Industrial & engineering chemistry research, 34(8), 1995, pp. 2881-2888
Isothermal and isobaric desorption of carbon dioxide was experimentall
y evaluated by purging adsorbent columns saturated with pure carbon di
oxide with pure hydrogen, nitrogen, and methane. Three different activ
ated carbons and two zeolites were investigated as adsorbents. The eff
ects of purge gas flow rate, system pressure and temperature, strength
of carbon dioxide adsorption, and selectivity of adsorption between c
arbon dioxide and the purge gas on the desorption process were measure
d. Instantaneous local equilibrium between gas and adsorbed phases was
established under the conditions of the experiments. An analytical ma
thematical model for isothermal and isobaric desorption of binary gas
mixtures by purge was developed. It was demonstrated that the efficien
cy of desorption by purge can be increased by (1) lowering the desorpt
ion pressure, (2) increasing the adsorbent temperature, and (3) increa
sing the selectivity of adsorption of the purge gas over the desorbing
component.