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:10.1016/j.ces.2021.116514

Cited by 17 publications

(42 citation statements)

References 29 publications

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“…The dissociation temperatures of ionic clathrate hydrates of TiAA, TBA and TBP salts listed in Tables and are within the range from 0.96 °C (Bu 3 PropPBr·38H 2 O) to 31.5 °C (TiAAF·39H 2 O) . Hydrates of TiAA halides have the highest thermal stability; an increase in the anion size (F – < Cl – < Br – ) has an insignificant effect on the dissociation temperatures of hydrates, which are in the range of 31.5–29.6 °C.…”

Section: Thermophysical Characteristics Of Ichs Of Tiaa Tba and Tbp S...mentioning

confidence: 92%

“…This is because of the greater complementarity of the i-Am group compared to the Bu group to the cavities of the water lattice of ICHs. For instance, the substitution of one of the four Bu groups of the TBP cation with the i-Am group significantly increases the thermal stability of the hydrate ( T diss of TBPB·37H 2 O = 9.57 °C < Bu 3 iAmPB·36H 2 O = 15.65 °C), Table . An increase in the size of the n -alkyl chain of a carboxylate anion by the CH 2 group increases the dissociation temperature in the series formate < acetate < propionate of both TBA and TBP hydrates (Table ).…”

Section: Thermophysical Characteristics Of Ichs Of Tiaa Tba and Tbp S...mentioning

confidence: 99%

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Ionic Clathrate Hydrates of Tetraalkylammonium/phosphonium Salts: Structures, Properties, Some Applications, and Perspectives

2022

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Ionic clathrate hydrates (ICHs) belong to one of the groups of a wide class of clathrate hydrates. In the crystal structures of ICHs, cation–anion pairs of guest molecules, typically tetraalkylammonium/phosphonium salts, are included into the host framework of hydrogen-bonded water molecules. Because of their suitable phase change temperature and latent heat, ICHs are considered as promising phase change materials for application in cold energy storage and transportation. The presence of vacant cavities in ICHs structures, which can incorporate small gas molecules such as, for example, H2, CH4, CO2, N2, H2S, determines the possibility of their use for the separation and storage of gases. The formation of these double ICHs occurs under much milder pressure and temperature conditions compared to the pure gas hydrates of the same gases. Studying of the structural characteristics and thermophysical properties of ICHs and double ICHs with gases is the necessary basis for their effective applications in different practical ends. This work reviews information related to the new details and features of the structures of ICHs and double ICHs with gases revealed over the last decade or a little more as well as some thermophysical data such as hydrate numbers, temperatures and enthalpies of dissociation. This review focuses only on ICHs of tetrabutyl-, tetraisoamylammonium (TBA, TiAA), and tetrabutylphosphonium (TBP) salts, which are the most common representatives of this class of compounds. One of the sections is devoted to ICHs of TBA and TiAA with polymeric anions such as cross-linked polyacrylates. The purpose of the present paper is to review the studies that have been relatively little addressed in previous works.

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Section: Thermophysical Characteristics Of Ichs Of Tiaa Tba and Tbp S...mentioning

confidence: 92%

Section: Thermophysical Characteristics Of Ichs Of Tiaa Tba and Tbp S...mentioning

confidence: 99%

Ionic Clathrate Hydrates of Tetraalkylammonium/phosphonium Salts: Structures, Properties, Some Applications, and Perspectives

2022

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“…36 Recently, the thermodynamic properties of semiclathrate hydrates formed by asymmetric quaternary phosphonium salts whose one side chain was substituted from tetra-nbutylphosphonium (denoted as P 4444 ) by some alkyl and aryl chains, i.e., P 444R , were investigated. 38,39 It was found that the melting temperatures and fusion heats of the quaternary phosphonium salt hydrates were also affected by the side chains.…”

Section: Introductionmentioning

confidence: 99%

“…, P 444R , were investigated. 38,39 It was found that the melting temperatures and fusion heats of the quaternary phosphonium salt hydrates were also affected by the side chains.…”

Section: Introductionmentioning

confidence: 99%

Designing the structure and relevant properties of semiclathrate hydrates by partly asymmetric alkylammonium salts

Muromachi

Kida

Morimoto

et al. 2022

Phys. Chem. Chem. Phys.

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“…TBAB SCH [8][9][10][11][12][13][14] 12.0℃ 13.1℃ [14] 12.42℃ 285.57 K TBAB [15,16] [ 15,17] SCH SCH [18][19][20][21][22] [ [18][19][20][21] [22] TBAB SCH SEM [14] X SAXS [23] DSC [23] 2 Fig. 1 SEM image of a replica film precisely reflecting the microstructures in the TBAB semiclathrate hydrate.…”

mentioning

confidence: 99%

セミクラスレートハイドレート分解後の残余溶液構造と結晶生成ヒステリシスの関係

Sugahara¹,

Machida²

2021

JAPANESE JOURNAL OF MULTIPHASE FLOW

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As a candidate for latent heat storage materials, a semiclathrate hydrate (SCH, a kind of clathrate hydrate) has been expected. A remaining challenge toward the practical use of SCHs is to diminish a large degree of supercooling in the SCH crystallization. One of the effective solutions is the utilization of the hysteresis called the "memory effect". The memory effect diminishes supercooling and/or the induction period in the clathrate hydrate recrystallization. We have elucidated that the solution structures (called clusters) remaining in the aqueous solution after complete SCH decomposition is closely related to the memory effect. In this paper, we introduce the experimental results on the residual clusters in the tetra-n-butylammonium bromide (TBAB) aqueous solution resulting from TBAB SCH decomposition, which were observed by scanning electron microscopy (SEM) with the freeze-fracture replica method, a small-angle X-ray scattering (SAXS), and a high-precision differential scanning calorimetry (µDSC).

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

Cited by 17 publications

References 29 publications

Ionic Clathrate Hydrates of Tetraalkylammonium/phosphonium Salts: Structures, Properties, Some Applications, and Perspectives

Ionic Clathrate Hydrates of Tetraalkylammonium/phosphonium Salts: Structures, Properties, Some Applications, and Perspectives

Designing the structure and relevant properties of semiclathrate hydrates by partly asymmetric alkylammonium salts

セミクラスレートハイドレート分解後の残余溶液構造と結晶生成ヒステリシスの関係

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