Dissociation behaviour of (tetra-n-butylammonium bromide + tetra-n-butylammonium chloride) mixed semiclathrate hydrate systems

Oshima, Motoi; Kida, Masato; Jin, Yusuke; Nagao, Jiro

doi:10.1016/j.jct.2015.07.009

Cited by 32 publications

(43 citation statements)

References 28 publications

(63 reference statements)

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“…To crystallize the sample in the rst attempt, supercooling to $250 K was usually needed, and at this temperature, ice could also form. Therefore, we employed the annealing process 20 to avoid the formation of ice in the cell. Aer the rst crystallization, the cell temperature was raised near the melting point of the hydrate, i.e., $283 K, and the cell was cooled again to a temperature just over 273 K. Aer repeating this process a few times, we obtained good DSC curves without an ice peak.…”

Section: Dsc Measurementsmentioning

confidence: 99%

Thermodynamic stabilization of semiclathrate hydrates by hydrophilic group

et al. 2017

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Section: Dsc Measurementsmentioning

confidence: 99%

Thermodynamic stabilization of semiclathrate hydrates by hydrophilic group

et al. 2017

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“…The properties of the selected guest molecules are listed in Table 1. [24] in TBAB, TBAC, and (TBAB + TBAC) mixed hydrate systems at x = 0.036 and 0.1 MPa (x was the total mole fraction of guest molecules in all aqueous solution). g The data reported by Rodionova et al [30] at TBAC aqueous solution concentrations of 20 and 25 wt %.…”

Section: Methodsmentioning

confidence: 99%

“…Mixed hydrates are solid substances formed by mixing different guest working substances with water in different proportions under certain conditions. They can overcome the shortcomings of using a single working substance for cold storage, which include a long induction period, low conversion efficiency, and low phase transition temperature [21][22][23][24]. TBAC and TBAB are semi-clathrate hydrates.…”

Section: Of 14mentioning

confidence: 99%

“…In this structure of hydrates, the guest molecules participate in the lattice structure. Oshima et al [24] reported that the hydration number of a mixed TBAB/TBAC hydrate was slightly higher than that of the pure hydrate, and the maximum dissociation temperature and enthalpy of the mixed hydrate were higher than those of the pure hydrate. Therefore, mixed hydrates are potentially effective heat storage materials for use under relatively mild conditions.…”

Section: Of 14mentioning

confidence: 99%

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Hydrates for Cold Storage: Formation Characteristics, Stability, and Promoters

Chen¹,

Han

Chen

et al. 2021

Applied Sciences

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The potential of hydrates formed from R141b (CH3CCl2F), trimethylolethane (TME), and tetra-n-butylammonium bromide/tetra-n-butylammonium chloride (TBAB/TBAC) to be used as working substances for cold storage was investigated to provide a solution for unbalanced energy grids. In this study, the characteristics of hydrate formation, crystal morphology of hydrates, and the stability of hydrate in cyclic formation under 0.1 MPa and at 5 °C were carried out. It found that the ice had a positive effect on the hydrate formation under same conditions. Upon the addition of the ice cube, the induction time of R141b, TME, and TBAB/TBAC hydrates decreased markedly, and significantly high formation rates were obtained. Under magnetic stirring, the rate at which TBAB/TBAC formed hydrates was significantly lower than that when ice was used. In microscopic experiments, it was observed that the TBAB/TBAC mixture formed hydrates with more nucleation sites and compact structures, which may increase the hydrate formation rate. In the multiple cycle formation of TBAB/TBAC hydrates, the induction time gradually decreased with the increasing number of formation cycles and finally stabilized, which indicated the potential of the TBAB/TBAC hydrates for application in cold storage owing to their good durability and short process time for heat absorption and release.

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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.…”

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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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Dissociation behaviour of (tetra-n-butylammonium bromide + tetra-n-butylammonium chloride) mixed semiclathrate hydrate systems

Cited by 32 publications

References 28 publications

Thermodynamic stabilization of semiclathrate hydrates by hydrophilic group

Thermodynamic stabilization of semiclathrate hydrates by hydrophilic group

Hydrates for Cold Storage: Formation Characteristics, Stability, and Promoters

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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