Phase equilibrium relations of tetra-n-butylphosphonium propionate and butyrate semiclathrate hydrates

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

Fluid Phase Equilibria, 2019, 485, 61-66

Number of Access:484（2025-11-05 05:12 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/91302

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Title
Phase equilibrium relations of tetra-n-butylphosphonium propionate and butyrate semiclathrate hydrates
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
Subject
Differential scanning calorimetry
Enthalpy
Phase equilibria
Semiclathrate hydrate
Supercooling
Abstract
This paper reports phase equilibrium (temperature–composition) relations of semiclathrate hydrates formed from tetra-n-butylphosphonium propionate (TBP-Pro) and butyrate (TBP-But) + water systems. Their maximum solid–liquid phase equilibrium temperatures at atmospheric pressure were located at (288.75 ± 0.06) K and the mole fraction x1 = 0.035 ± 0.001 and (287.01 ± 0.06) K and x1 = 0.028 ± 0.001, respectively. They showed equilibrium temperatures higher than those of tetra-n-butylphosphonium formate, acetate, and lactate semiclathrate hydrates. The dissociation enthalpies of TBP-Pro and TBP-But semiclathrate hydrates were (190 ± 5) J·g−1 and (204 ± 5) J·g−1, respectively. The temperature difference between formation and dissociation, that is, the maximum allowable degree of supercooling, was (17.7 ± 1.5) K for TBP-Pro semiclathrate hydrate and (15.4 ± 1.4) K for TBP-But one.
Publisher
Elsevier B.V.
Source Title
Fluid Phase Equilibria
Volume (Issue)
485
Page
61-66
Date of Issued
2019-04-15
Language
English
Handle URL
https://hdl.handle.net/11094/91302
PISSN
03783812
Relation.isVersionOf
DOI (Publisher Version)
https://doi.org/10.1016/j.fluid.2018.11.038
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