Phase equilibrium relations for tetra-n-butylphosphonium acetate semiclathrate hydrate systems in the presence of methane, carbon dioxide, nitrogen, or ethane

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

Fluid Phase Equilibria, 2019, 488, 48-53

Number of Access:113（2025-04-10 00:52 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/91303

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Title
Phase equilibrium relations for tetra-n-butylphosphonium acetate semiclathrate hydrate systems in the presence of methane, carbon dioxide, nitrogen, or ethane
Creator
CreatorName
Shimada, Masami
CreatorName
Shimada, Jin
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
Subject
Gas separation
Phase equilibria
Phase transition
Semiclathrate hydrate
Spectroscopy
Abstract
Thermodynamic stabilities of tetra-n-butylphosphonium acetate (TBP-Ace) semiclathrate hydrates in the presence of methane (CH 4 ), carbon dioxide (CO 2 ), nitrogen (N 2 ), or ethane (C 2 H 6 ) were measured in a pressure range up to approximately 5 MPa. The dissociation temperature of TBP-Ace + CH 4 , TBP-Ace + CO 2 , and TBP-Ace + N 2 semiclathrate hydrates increased drastically with an increase in pressure, which means that CH 4 , CO 2 , and N 2 molecules occupy the vacant cages of the TBP-Ace semiclathrate hydrate. On the other hand, the C 2 H 6 molecules hardly occupied the cages, resulting in small pressure dependence of the dissociation temperature. Raman spectra and powder X-ray diffraction patterns of TBP-Ace + CO 2 semiclathrate hydrate reveal that the phase transition occurs at 1.04 ± 0.04 MPa and 285.88 ± 0.05 K. One of the possible reasons why the phase transition occurs is that the carbonate and/or hydrogen carbonate anions derived from the CO 2 molecules are replaced with some of acetate anions in the TBP-Ace + CO 2 semiclathrate hydrate.
Publisher
Elsevier B.V.
Source Title
Fluid Phase Equilibria
Volume (Issue)
488
Page
48-53
Date of Issued
2019-06-01
Language
English
Handle URL
https://hdl.handle.net/11094/91303
PISSN
03783812
Relation.isVersionOf
DOI (Publisher Version)
https://doi.org/10.1016/j.fluid.2019.01.027
Access Rights
open access
CopyRight
©2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
oaire:version
Accepted Manuscript
Category
学術雑誌論文 Journal Article