Phase equilibrium temperature and dissociation enthalpy in the tri-n-butylalkylphosphonium bromide semiclathrate hydrate systems

Shimada, Jin; Shimada, Masami; Sugahara, Takeshi; Tsunashima, Katsuhiko; Takaoka, Yuta; Tani, Atsushi

doi:https://doi.org/10.1016/j.ces.2021.116514

Phase equilibrium temperature and dissociation enthalpy in the tri-n-butylalkylphosphonium bromide semiclathrate hydrate systems

Shimada, Jin; Shimada, Masami; Sugahara, Takeshi et al.

Chemical Engineering Science, 2021, 236, 116514

Number of Access:133（2025-04-10 00:08 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/91300

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Title	Phase equilibrium temperature and dissociation enthalpy in the tri-n-butylalkylphosphonium bromide semiclathrate hydrate systems
Creator	CreatorName Shimada, Jin
	CreatorName Shimada, Masami
	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
	CreatorName Takaoka, Yuta
	NRID 1000010335333 1000010335333 CreatorName Tani, Atsushi
Subject	Dissociation enthalpy
	Phase equilibrium
	Quaternary phosphonium cation
	Semiclathrate hydrate
Abstract	Semiclathrate hydrate (SCH) is one of the phase change materials suitable for cold storage. The thermodynamic properties of SCHs, such as an equilibrium temperature and a dissociation enthalpy, depend on the size and shape of guest substances. In this study, to reveal the effect of cation size and shape on the thermodynamic properties, tri-n-butylalkylphosphonium bromide (P444R-Br) SCHs, where the alkyl group was n-propyl (R = 3), n-butyl (R = 4), n-pentyl (R = 5), i-butyl (R = i-4), i-pentyl (R = i-5), or allyl (R = Al)), were investigated. The branched alkyl groups (R = i-4 or i-5) raised the equilibrium temperature, whereas the shorter alkyl groups (R = 3 or Al) lowered one. Except for P4445-Br and P444(Al)-Br SCHs, the other P444R-Br SCHs had the same orthorhombic structure. Among the orthorhombic systems in the present study, the semiclathrate hydrate with a higher equilibrium temperature had a larger dissociation enthalpy.
Publisher	Elsevier Ltd
Source Title	Chemical Engineering Science
Volume (Issue)	236
Page	116514
Date of Issued	2021-06-08
Language	English
Handle URL	https://hdl.handle.net/11094/91300
PISSN	00092509
Relation.isVersionOf	DOI (Publisher Version) https://doi.org/10.1016/j.ces.2021.116514
Access Rights	open access
CopyRight	©2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
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	Chemical Engineering Science. 2021, 236, p. 116514
DC.title	Phase equilibrium temperature and dissociation enthalpy in the tri-n-butylalkylphosphonium bromide semiclathrate hydrate systems
DC.creator	Shimada, Jin
	Shimada, Masami
	Sugahara, Takeshi
	Tsunashima, Katsuhiko
	Takaoka, Yuta
	Tani, Atsushi
DC.publisher	Elsevier Ltd
DC.language' scheme='DCTERMS.RFC1766	English
DC.type' scheme='DCTERMS.DCMIType	Text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2021-06-08
DC.identifier	https://doi.org/10.1016/j.ces.2021.116514
DC.subject	Dissociation enthalpy
	Phase equilibrium
	Quaternary phosphonium cation
	Semiclathrate hydrate
DCTERMS.abstract	Semiclathrate hydrate (SCH) is one of the phase change materials suitable for cold storage. The thermodynamic properties of SCHs, such as an equilibrium temperature and a dissociation enthalpy, depend on the size and shape of guest substances. In this study, to reveal the effect of cation size and shape on the thermodynamic properties, tri-n-butylalkylphosphonium bromide (P444R-Br) SCHs, where the alkyl group was n-propyl (R = 3), n-butyl (R = 4), n-pentyl (R = 5), i-butyl (R = i-4), i-pentyl (R = i-5), or allyl (R = Al)), were investigated. The branched alkyl groups (R = i-4 or i-5) raised the equilibrium temperature, whereas the shorter alkyl groups (R = 3 or Al) lowered one. Except for P4445-Br and P444(Al)-Br SCHs, the other P444R-Br SCHs had the same orthorhombic structure. Among the orthorhombic systems in the present study, the semiclathrate hydrate with a higher equilibrium temperature had a larger dissociation enthalpy.
DC.rights	©2021. 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.format	91300
citation_title	Phase equilibrium temperature and dissociation enthalpy in the tri-n-butylalkylphosphonium bromide semiclathrate hydrate systems
citation_author	Shimada, Jin
	Shimada, Masami
	Sugahara, Takeshi
	Tsunashima, Katsuhiko
	Takaoka, Yuta
	Tani, Atsushi
citation_publisher	Elsevier Ltd
citation_language	English
citation_date	2021-06-08
citation_journal_title	Chemical Engineering Science
citation_volume	236
citation_firstpage	116514
citation_doi	https://doi.org/10.1016/j.ces.2021.116514
citation_public_url	https://hdl.handle.net/11094/91300

Phase equilibrium temperature and dissociation enthalpy in the tri-n-butylalkylphosphonium bromide semiclathrate hydrate systems

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