Phase equilibria of carbon dioxide + sulfur hexafluoride mixed gas hydrate as fundamental data toward improving the mechanical properties of marine sediments

Ishikawa, Tasuku; Sugahara, Takeshi; Hirai, Takayuki; Yoshimoto, Norimasa

doi:https://doi.org/10.1016/j.fluid.2025.114525

Phase equilibria of carbon dioxide + sulfur hexafluoride mixed gas hydrate as fundamental data toward improving the mechanical properties of marine sediments

Ishikawa, Tasuku; Sugahara, Takeshi; Hirai, Takayuki et al.

Fluid Phase Equilibria, 2025, 599, 114525

アクセス数:82件（2025-12-11 09:06 集計）

固定URL: https://hdl.handle.net/11094/102339

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タイトル	Phase equilibria of carbon dioxide + sulfur hexafluoride mixed gas hydrate as fundamental data toward improving the mechanical properties of marine sediments
著者	著者名 Ishikawa, Tasuku
	NRID 1000020335384 1000020335384 ORCID 0000-0002-5236-5605 0000-0002-5236-5605 researchmap permalink read0191169 read0191169 Scopus Author ID 56212469300 56212469300 著者名 Sugahara, Takeshi
	NRID 1000080208800 1000080208800 ORCID 0000-0003-4747-4919 0000-0003-4747-4919 researchmap permalink read0013780 read0013780 Scopus Author ID 7402768651 7402768651 著者名 Hirai, Takayuki
	NRID 1000000325242 1000000325242 著者名 Yoshimoto, Norimasa
キーワード等	Azeotropic-like behavior
	Clathrate hydrate
	CO2 storage
	Ground improvement
	Phase equilibria
内容	Ishikawa T., Sugahara T., Hirai T., et al. Phase equilibria of carbon dioxide + sulfur hexafluoride mixed gas hydrate as fundamental data toward improving the mechanical properties of marine sediments. Fluid Phase Equilibria 599, 114525 (2026); https://doi.org/10.1016/j.fluid.2025.114525.
抄録	Isothermal phase equilibria of carbon dioxide (CO₂) + sulfur hexafluoride (SF₆) mixed gas hydrate at temperatures of 281.85 K, 284.05 K, 288.05 K, 291.05 K, 291.74 K, and 292.20 K were measured so as to improve the mechanical properties of marine sediment by hydrate cementation. The addition of SF₆ significantly reduces the equilibrium pressure of CO₂-containing mixed gas hydrate at each temperature. At temperatures above the quadruple point Q₂ (pure CO₂ hydrate + aqueous + CO₂-rich liquid + vapor phases) of 283.22 K, the four-phase (mixed gas hydrate + aqueous + guest-rich liquid + vapor phases) equilibrium point(s) exists(exist) on the isotherms of the CO₂+SF₆ mixed gas hydrate system. The four-phase equilibrium curve was connected from the quadruple point Q₂ of pure CO₂ hydrate to that of pure SF₆ hydrate and had a maximum temperature point at 292.0 ± 0.2 K, which is higher than both the Q₂ temperatures of pure CO₂ hydrate and pure SF₆ hydrate. Therefore, the addition of SF₆ to CO₂ brings a significant effect to expand the thermodynamically stable region of CO₂-containing mixed gas hydrate in order for simultaneous CO₂ storage and sediment improvement to be realized at marine sediment.
出版者	Elsevier B.V.
収録物名	Fluid Phase Equilibria
巻(号)	599
ページ	114525
刊行年月	2025-07-09
言語	英語
ハンドルURL	https://hdl.handle.net/11094/102339
PISSN	03783812
関連情報 (isVersionOf)	DOI (出版社版) https://doi.org/10.1016/j.fluid.2025.114525
アクセス権	embargoed access
権利情報	© 2025. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
権利情報	The full-text file will be made open to the public on 9 July 2027 in accordance with the publisher's policy.
出版タイプ	Accepted Manuscript
カテゴリ	学術雑誌論文 Journal Article

資源タイプ	学術雑誌論文
ローカル資源タイプ	学術雑誌論文
DCMI資源タイプ	text
DCTERMS.bibliographicCitation	Fluid Phase Equilibria. 2025, 599, p. 114525
DC.title	Phase equilibria of carbon dioxide + sulfur hexafluoride mixed gas hydrate as fundamental data toward improving the mechanical properties of marine sediments
DC.creator	Ishikawa, Tasuku
	Sugahara, Takeshi
	Hirai, Takayuki
	Yoshimoto, Norimasa
DC.publisher	Elsevier B.V.
DC.language' scheme='DCTERMS.RFC1766	英語
DC.type' scheme='DCTERMS.DCMIType	text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2025-07-09
DC.identifier	https://doi.org/10.1016/j.fluid.2025.114525
DC.subject	Azeotropic-like behavior
	Clathrate hydrate
	CO2 storage
	Ground improvement
	Phase equilibria
DC.description	Ishikawa T., Sugahara T., Hirai T., et al. Phase equilibria of carbon dioxide + sulfur hexafluoride mixed gas hydrate as fundamental data toward improving the mechanical properties of marine sediments. Fluid Phase Equilibria 599, 114525 (2026); https://doi.org/10.1016/j.fluid.2025.114525.
DCTERMS.abstract	Isothermal phase equilibria of carbon dioxide (CO₂) + sulfur hexafluoride (SF₆) mixed gas hydrate at temperatures of 281.85 K, 284.05 K, 288.05 K, 291.05 K, 291.74 K, and 292.20 K were measured so as to improve the mechanical properties of marine sediment by hydrate cementation. The addition of SF₆ significantly reduces the equilibrium pressure of CO₂-containing mixed gas hydrate at each temperature. At temperatures above the quadruple point Q₂ (pure CO₂ hydrate + aqueous + CO₂-rich liquid + vapor phases) of 283.22 K, the four-phase (mixed gas hydrate + aqueous + guest-rich liquid + vapor phases) equilibrium point(s) exists(exist) on the isotherms of the CO₂+SF₆ mixed gas hydrate system. The four-phase equilibrium curve was connected from the quadruple point Q₂ of pure CO₂ hydrate to that of pure SF₆ hydrate and had a maximum temperature point at 292.0 ± 0.2 K, which is higher than both the Q₂ temperatures of pure CO₂ hydrate and pure SF₆ hydrate. Therefore, the addition of SF₆ to CO₂ brings a significant effect to expand the thermodynamically stable region of CO₂-containing mixed gas hydrate in order for simultaneous CO₂ storage and sediment improvement to be realized at marine sediment.
DC.rights	© 2025. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
DC.rights	The full-text file will be made open to the public on 9 July 2027 in accordance with the publisher's policy.
DC.format	102339
citation_title	Phase equilibria of carbon dioxide + sulfur hexafluoride mixed gas hydrate as fundamental data toward improving the mechanical properties of marine sediments
citation_author	Ishikawa, Tasuku
	Sugahara, Takeshi
	Hirai, Takayuki
	Yoshimoto, Norimasa
citation_publisher	Elsevier B.V.
citation_language	英語
citation_date	2025-07-09
citation_journal_title	Fluid Phase Equilibria
citation_volume	599
citation_firstpage	114525
citation_doi	https://doi.org/10.1016/j.fluid.2025.114525
citation_public_url	https://hdl.handle.net/11094/102339

Phase equilibria of carbon dioxide + sulfur hexafluoride mixed gas hydrate as fundamental data toward improving the mechanical properties of marine sediments

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