In this work, we reported an investigation
of using a fixed bed
of zeolite 13X (FBR) for hydrate-based CO2 capture from
a CO2/CH4 gas mixture (40 mol % CO2 and 60 mol % CH4). The experiments were carried out at
a fixed temperature of 277.15 K and in the pressure range of (5.2
to 6.7) MPa. The effects of the driving force (overpressure), surfactant
sodium dodecyl sulfate (SDS), and the fixed bed saturations on hydrate
formation and CO2 selectivity were elucidated. The results
indicated that hydrate growth in the fixed zeolite 13X was enhanced
as the driving force was increased from 2.5 to 4.0 MPa, but the final
gas uptake, CO2 recovery, and CO2 separation
factor were reduced. Hydrate formation in the fixed zeolite 13X was
promoted in the presence of SDS as compared to that in the absence
of SDS. When the initial driving force was fixed at 2.5 MPa, the final
gas uptake, CO2 recovery, and separation factor obtained
at 75% saturation of the fixed bed were higher than those obtained
at 100% and 50% saturations. The comparison between the fixed bed
of zeolite 13X and the stirred tank reactors shows that CO2 selectivity obtained in the fixed bed of zeolite 13X was lower than
those obtained in the stirred tank reactors. Therefore, zeolite 13X
can be used to enhance hydrate formation but may not be a proper candidate
for CO2 capture from the CO2/CH4 gas
mixture.
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