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Formation Kinetics of the Mixed Cyclopentane—Carbon Dioxide Hydrates in Aqueous Sodium Chloride Solutions

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  • Xuebing Zhou

    (Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
    CAS Key Laboratory of Gas Hydrate, Guangzhou 510640, China
    Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China
    Guangzhou Center for Gas Hydrate Research, Chinese Academy of Sciences, Guangzhou 510640, China)

  • Ye Zhang

    (Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China)

  • Xiaoya Zang

    (Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
    CAS Key Laboratory of Gas Hydrate, Guangzhou 510640, China
    Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China
    Guangzhou Center for Gas Hydrate Research, Chinese Academy of Sciences, Guangzhou 510640, China)

  • Deqing Liang

    (Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
    CAS Key Laboratory of Gas Hydrate, Guangzhou 510640, China
    Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China
    Guangzhou Center for Gas Hydrate Research, Chinese Academy of Sciences, Guangzhou 510640, China)

Abstract

Hydrate formation from cyclopentane (CP) and carbon dioxide was measured at 281 K by powder X-ray diffraction (PXRD) and macroscopic methods. The effect of initial pressure and CP mass fraction in liquid phase was analyzed. The results showed that hydrate formation was assumed to start with the nucleation of the mixed CP-CO 2 hydrate with small fraction of CO 2 followed by a large continuous CO 2 adsorption. Initial pressure was found to have a positive correlation with the total CO 2 consumptions when the initial pressure was below 2.5 MPa. However, the total CO 2 consumptions dropped by over a half as the initial pressure was 3.0 MPa. PXRD revealed that all the hydrate samples formed at different initial pressures were structure II. The CO 2 consumptions were assumed to be inhibited by the competitive occupation of 5 12 6 4 cages between CP and CO 2 molecules when the initial pressure was above 2.5 MPa. The CO 2 consumptions were also found to be reduced as the CP mass fraction was above 0.25. An excess of CP molecules was not assumed to strengthen the formation of the mixed CP-CO 2 hydrates at the initial stage, but increased the thickness of liquid CP film at aqueous brine and hydrate particles, which increased the diffusion resistance of CO 2 molecules. Therefore, the suitable initial pressure and the CP mass fraction for the mixed CP-CO 2 hydrate formation should be around 2.5 MPa and 0.2, respectively.

Suggested Citation

  • Xuebing Zhou & Ye Zhang & Xiaoya Zang & Deqing Liang, 2020. "Formation Kinetics of the Mixed Cyclopentane—Carbon Dioxide Hydrates in Aqueous Sodium Chloride Solutions," Energies, MDPI, vol. 13(17), pages 1-10, August.
  • Handle: RePEc:gam:jeners:v:13:y:2020:i:17:p:4388-:d:404042
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    References listed on IDEAS

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    1. Yi Wang & Jing-Chun Feng & Xiao-Sen Li & Yu Zhang & Gang Li, 2016. "Evaluation of Gas Production from Marine Hydrate Deposits at the GMGS2-Site 8, Pearl River Mouth Basin, South China Sea," Energies, MDPI, vol. 9(3), pages 1-22, March.
    2. Yu, Yi-Song & Zhang, Qing-Zong & Li, Xiao-Sen & Chen, Chang & Zhou, Shi-Dong, 2020. "Kinetics, compositions and structures of carbon dioxide/hydrogen hydrate formation in the presence of cyclopentane," Applied Energy, Elsevier, vol. 265(C).
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    Cited by:

    1. Lu Liu & Yuanxin Yao & Xuebing Zhou & Yanan Zhang & Deqing Liang, 2021. "Improved Formation Kinetics of Carbon Dioxide Hydrate in Brine Induced by Sodium Dodecyl Sulfate," Energies, MDPI, vol. 14(8), pages 1-12, April.

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