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<p>The methane hydrate and ice formation in powder polyvinyl alcohol cryogel (PPVACG) was studied by high-pressure differential scanning calorimetry. Recently, we shown that PPVACG can be repeatedly used to form methane hydrates while maintaining a high methane hydrate formation rate and high methane uptake capacity. Due to the presence in the powder cryogel of a structured polymer, formed as a result of cryogenic processing (freezing/thawing) of polyvinyl alcohol solutions, PPVACGs are more resistant to cycles of methane hydrate formation/dissociation, than aqueous powder systems obtained using polysaccharides with comparable polymer content. The aim of this work is to identify the features of the kinetics of the methane hydrate formation and ice crystallization in PPVACG and to establish the nature of the influence of ice crystallization on the methane hydrate formation. It was established that the methane hydrate formation in PPVACG occurs mainly by a “relay” mechanism, when the hydrate formation in isolated cryogel particles initiates the hydrate formation in neighboring cryogel particles. In contrast, ice crystallization in powder cryogel particles proceeds generally in isolation. It is shown that the ice crystallization in a powder cryogels can significantly reduce the degree of transition of water to hydrate during cycles methane hydrate formation/dissociation. The results may be useful for the development of hydrate-based technologies for natural gas store.</p>

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Study of methane hydrate formation in powder cryogels by differential thermal analysis

  • 期刊论文

  • 发表日期：

    2025年7月18日

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  • Podenko Lev Stepanovich,
  • Drachuk Andrey Olegovich,
  • Semenov Matvei Egorovich,
  • Pletneva Klavdia Andreevna,
  • Molokitina Nadezhda Sergeevna

摘要

The methane hydrate and ice formation in powder polyvinyl alcohol cryogel (PPVACG) was studied by high-pressure differential scanning calorimetry. Recently, we shown that PPVACG can be repeatedly used to form methane hydrates while maintaining a high methane hydrate formation rate and high methane uptake capacity. Due to the presence in the powder cryogel of a structured polymer, formed as a result of cryogenic processing (freezing/thawing) of polyvinyl alcohol solutions, PPVACGs are more resistant to cycles of methane hydrate formation/dissociation, than aqueous powder systems obtained using polysaccharides with comparable polymer content. The aim of this work is to identify the features of the kinetics of the methane hydrate formation and ice crystallization in PPVACG and to establish the nature of the influence of ice crystallization on the methane hydrate formation. It was established that the methane hydrate formation in PPVACG occurs mainly by a “relay” mechanism, when the hydrate formation in isolated cryogel particles initiates the hydrate formation in neighboring cryogel particles. In contrast, ice crystallization in powder cryogel particles proceeds generally in isolation. It is shown that the ice crystallization in a powder cryogels can significantly reduce the degree of transition of water to hydrate during cycles methane hydrate formation/dissociation. The results may be useful for the development of hydrate-based technologies for natural gas store.