Peritectic phase behavior of tetra-n-butylphosphonium trifluoroacetate semiclathrate hydrate

Shimada, Jin; Shimada, Masami; Azuma, Sakura; Sugahara, Takeshi; Tsunashima, Katsuhiko; Hirai, Takayuki

doi:https://doi.org/10.1016/j.fluid.2023.113727

Peritectic phase behavior of tetra-n-butylphosphonium trifluoroacetate semiclathrate hydrate

Shimada, Jin; Shimada, Masami; Azuma, Sakura et al.

Fluid Phase Equilibria, 2023, 567, 113727

Number of Access:171（2025-04-10 00:13 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/90047

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Title	Peritectic phase behavior of tetra-n-butylphosphonium trifluoroacetate semiclathrate hydrate
Creator	CreatorName Shimada, Jin
	CreatorName Shimada, Masami
	CreatorName Azuma, Sakura
	NRID 1000020335384 1000020335384 ORCID 0000-0002-5236-5605 0000-0002-5236-5605 researchmap permalink read0191169 read0191169 Scopus Author ID 56212469300 56212469300 CreatorName Sugahara, Takeshi
	NRID 1000090550070 1000090550070 CreatorName Tsunashima, Katsuhiko
	NRID 1000080208800 1000080208800 researchmap permalink read0013780 read0013780 Scopus Author ID 7402768651 7402768651 CreatorName Hirai, Takayuki
Subject	Semiclathrate hydrate
	Phase equilibria
	Differential scanning calorimetry
	Cluster
	Lower critical solution temperature
Abstract	Phase equilibrium (temperature–composition) relations of the tetra-n-butylphosphonium trifluoroacetate (TBP-TFA) + water binary system including solid (semiclathrate hydrate, SCH)-liquid equilibria and liquid-liquid equilibria were investigated. Phase diagram of TBP-TFA SCH exhibited peritectic behavior. The maximum decomposition temperature (peritectic temperature) of TBP-TFA SCH at atmospheric pressure were 275.9 ± 0.1 K. The stoichiometric composition of TBP-TFA SCH was located at the mole fraction of 0.027 ± 0.002. The decomposition enthalpy of TBP-TFA SCH was 199 ± 2 J/g. At temperatures above the lower critical solution temperature (LCST), the liquid-liquid phase separation appeared. Interestingly, the composition at the LCST was 0.026 ± 0.002, which is very similar to the stoichiometric composition of TBP-TFA SCH. It implies that both cluster-based solution structures are similar.
Publisher	Elsevier
Source Title	Fluid Phase Equilibria
Volume (Issue)	567
Page	113727
Date of Issued	2023-01-11
Language	English
Handle URL	https://hdl.handle.net/11094/90047
PISSN	03783812
NCID	AA00648043
Relation.isVersionOf	DOI (Publisher Version) https://doi.org/10.1016/j.fluid.2023.113727
Access Rights	open access
CopyRight	©2023. This manuscript version is made available under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
oaire:version	Accepted Manuscript
Category	学術雑誌論文 Journal Article

Resource Type	journal article
Local Type	Journal Article
DCMI Type	Text
DCTERMS.bibliographicCitation	Fluid Phase Equilibria. 2023, 567, p. 113727
DC.title	Peritectic phase behavior of tetra-n-butylphosphonium trifluoroacetate semiclathrate hydrate
DC.creator	Shimada, Jin
	Shimada, Masami
	Azuma, Sakura
	Sugahara, Takeshi
	Tsunashima, Katsuhiko
	Hirai, Takayuki
DC.publisher	Elsevier
DC.language' scheme='DCTERMS.RFC1766	English
DC.type' scheme='DCTERMS.DCMIType	Text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2023-01-11
DC.identifier	https://doi.org/10.1016/j.fluid.2023.113727
DC.subject	Semiclathrate hydrate
	Phase equilibria
	Differential scanning calorimetry
	Cluster
	Lower critical solution temperature
DCTERMS.abstract	Phase equilibrium (temperature–composition) relations of the tetra-n-butylphosphonium trifluoroacetate (TBP-TFA) + water binary system including solid (semiclathrate hydrate, SCH)-liquid equilibria and liquid-liquid equilibria were investigated. Phase diagram of TBP-TFA SCH exhibited peritectic behavior. The maximum decomposition temperature (peritectic temperature) of TBP-TFA SCH at atmospheric pressure were 275.9 ± 0.1 K. The stoichiometric composition of TBP-TFA SCH was located at the mole fraction of 0.027 ± 0.002. The decomposition enthalpy of TBP-TFA SCH was 199 ± 2 J/g. At temperatures above the lower critical solution temperature (LCST), the liquid-liquid phase separation appeared. Interestingly, the composition at the LCST was 0.026 ± 0.002, which is very similar to the stoichiometric composition of TBP-TFA SCH. It implies that both cluster-based solution structures are similar.
DC.rights	©2023. This manuscript version is made available under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
DC.format	90047
citation_title	Peritectic phase behavior of tetra-n-butylphosphonium trifluoroacetate semiclathrate hydrate
citation_author	Shimada, Jin
	Shimada, Masami
	Azuma, Sakura
	Sugahara, Takeshi
	Tsunashima, Katsuhiko
	Hirai, Takayuki
citation_publisher	Elsevier
citation_language	English
citation_date	2023-01-11
citation_journal_title	Fluid Phase Equilibria
citation_volume	567
citation_firstpage	113727
citation_doi	https://doi.org/10.1016/j.fluid.2023.113727
citation_public_url	https://hdl.handle.net/11094/90047

Peritectic phase behavior of tetra-n-butylphosphonium trifluoroacetate semiclathrate hydrate

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