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<p>This study investigated the influence of low-dosage thermodynamic promoters on gas hydrate-based CO<sub>2</sub> capture from CO<sub>2</sub>&#xa0;+&#xa0;N<sub>2</sub> mixtures in saline environments for offshore applications. Phase equilibria measured in the presence of 0.1 and 1.0&#xa0;mol% tetrahydrofuran (THF) demonstrated that a small amount of THF mitigated the inhibition effect of NaCl. However, the promotion effect diminished with increasing pressure, possibly due to the transfer of a small fraction of THF molecules to the vapor phase at high pressure. Weight fractions calculated from Rietveld analysis revealed that low-dosage THF promoted sII hydrate formation, enhancing thermodynamic stability. Cage-dependent guest occupancy indicated that higher THF concentrations in solution decreased both CO<sub>2</sub> selectivity and capacity, as N<sub>2</sub> was preferentially captured in the small cages of sII hydrates. These findings provide insights into optimizing hydrate-based CO<sub>2</sub> capture in offshore environments by balancing thermodynamic stability enhancement with CO<sub>2</sub> separation efficiency.</p>

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Optimizing Hydrate-Based CO2 Capture in Saline Environments Using Low-Dosage THF for Seawater Utilization

  • 期刊论文

  • 发表日期：

    2025年8月30日

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  • Yeonjin Kang,
  • Dagyeong Ock,
  • Jinwoo Lee,
  • Jonghyuk Lee,
  • Junghoon Mok,
  • Woojin Go,
  • Wonjung Choi

摘要

This study investigated the influence of low-dosage thermodynamic promoters on gas hydrate-based CO2 capture from CO2 + N2 mixtures in saline environments for offshore applications. Phase equilibria measured in the presence of 0.1 and 1.0 mol% tetrahydrofuran (THF) demonstrated that a small amount of THF mitigated the inhibition effect of NaCl. However, the promotion effect diminished with increasing pressure, possibly due to the transfer of a small fraction of THF molecules to the vapor phase at high pressure. Weight fractions calculated from Rietveld analysis revealed that low-dosage THF promoted sII hydrate formation, enhancing thermodynamic stability. Cage-dependent guest occupancy indicated that higher THF concentrations in solution decreased both CO2 selectivity and capacity, as N2 was preferentially captured in the small cages of sII hydrates. These findings provide insights into optimizing hydrate-based CO2 capture in offshore environments by balancing thermodynamic stability enhancement with CO2 separation efficiency.