Investigation of CO2 Capture from a CO2 + CH4 Gas Mixture by Gas Hydrate Formation in the Fixed Bed of a Molecular Sieve

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• 作者：Dong-Liang Zhong ; Zheng Li ; Yi-Yu Lu ; Jia-Le Wang ; Jin Yan ; Sheng-Lan Qing
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：July 27, 2016
• 年：2016
• 卷：55
• 期：29
• 页码：7973-7980
• 全文大小：506K
• 年卷期：0
• ISSN：1520-5045

文摘

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.