Phase diagram, latent heat, and specific heat of TBAB semiclathrate hydrate crystals

Oyama, Hiroyuki; Shimada, Wataru; Ebinuma, Takao; Kamata, Yasushi; Takeya, Satoshi; Uchida, Tsutomu; Nagao, Jiro; Narita, Hideo

doi:10.1016/j.fluid.2005.06.005

Cited by 347 publications

(363 citation statements)

References 6 publications

(11 reference statements)

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“…relatively large (i.e. 5 K) [49] whereas the difference between 30.2 wt% TBPO (TBPO·28H 2 O) and 26.0 wt% TBPO (TBPO·34.5H 2 O) was rather small (less than 1 K) [45,46]. Moreover, the measured dissociation temperature of 5 wt% TBPO at ambient pressure was 276.2 K (with uncertainty of 0.5 K), whereas the corresponding temperature of 5 wt% TBAB was estimated by extrapolation to be 274.8 K or lower, depending on the hydrate type [40].…”

Section: Resultsmentioning

confidence: 99%

Phase equilibrium measurements for clathrate hydrates of flue gas (CO2+N2+O2) in the presence of tetra-n-butyl ammonium bromide or tri-n-butylphosphine oxide

Wang

2015

The Journal of Chemical Thermodynamics

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Please cite this article as: J. Du, L. Wang, Phase equilibrium measurements for clathrate hydrates of flue gas (CO 2 + N 2 + O 2 ) in the presence of tetra-n-butyl ammonium bromide or tri-n-butylphosphine oxide, J. Chem. Thermodynamics (2015), doi: http://dx.doi.org/10. 1016/j.jct.2015.04.023 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Abstract This paper reports the measured hydrate phase equilibria of simulated flue gas (12.6 vol% CO 2 , 80.5 vol% N 2 , 6.9 vol% O 2 ) in the presence of tetra-n-butyl ammonium bromide (TBAB) or tri-n-butylphosphine oxide (TBPO), at 0 wt%, 5 wt%, and 26 wt%, respectively. The measurements of the phase boundary between hydrate-liquid-vapor (H-L-V) phases and liquid-vapor (L-V) phases were performed within the temperature range (275.97 -293.99) K and pressure range (1.56 -18.78) MPa with using the isochoric step-heating pressure search method. It was found that addition of TBAB or TBPO allowed the incipient equilibrium hydrate formation conditions for the flue gas to become milder. Compared to TBAB, TBPO was largely more effective in reducing the phase equilibrium pressure.

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Section: Resultsmentioning

confidence: 99%

Phase equilibrium measurements for clathrate hydrates of flue gas (CO2+N2+O2) in the presence of tetra-n-butyl ammonium bromide or tri-n-butylphosphine oxide

Wang

2015

The Journal of Chemical Thermodynamics

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“…Furthermore, TBAB, TBAC and THF are characterized by rapid hydrate formation [40][41][42][43][44][45][46][47]. TBAC hydrates have a melting point of 15.0 °C and a latent heat of 200.7 kJ/kg [44,45], while THF hydrates have a melting point of 4.4 °C and a latent heat of 260 kJ/kg [46,47].…”

Section: Clathrate Hydrates As Phase Change Materialsmentioning

confidence: 99%

“…Researchers have conducted many investigations on the crystallization characteristics of TBAB hydrate crystals and their practical applications. The thermal and thermodynamic properties of TBAB semiclathrate hydrates, including their phase diagram [40,48,49], have been measured, and some data are presented in Table 2.…”

Section: Clathrate Hydrates As Phase Change Materialsmentioning

confidence: 99%

Clathrate Hydrates for Thermal Energy Storage in Buildings: Overview of Proper Hydrate-Forming Compounds

Castellani¹,

Morini

Filipponi

et al. 2014

Sustainability

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Increasing energy costs are at the origin of the great progress in the field of phase change materials (PCMs). The present work aims at studying the application of clathrate hydrates as PCMs in buildings. Clathrate hydrates are crystalline structures in which guest molecules are enclosed in the crystal lattice of water molecules. Clathrate hydrates can form also at ambient pressure and present a high latent heat, and for this reason, they are good candidates for being used as PCMs. The parameter that makes a PCM suitable to be used in buildings is, first of all, a melting temperature at about 25 °C. The paper provides an overview of groups of clathrate hydrates, whose physical and chemical characteristics could meet the requirements needed for their application in buildings. Simulations with a dynamic building simulation tool are carried out to evaluate the performance of clathrate hydrates in enhancing thermal comfort through the moderation of summer temperature swings and, therefore, in reducing energy consumption. Simulations suggest that clathrate hydrates have a potential in terms of improvement of indoor thermal comfort and a reduction of energy consumption for cooling. Cooling effects of 0.5 °C and reduced overheating hours of up to 1.1% are predicted. OPEN ACCESSSustainability 2014, 6 6816

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“…air conditioning systems, the use of ice slurry is no longer applicable because the ice melting point cannot be adjusted to positive temperature. Several authors (Lipkowski et al, 2002;Obata et al, 2003;Oyama et al, 2005) have shown that some kind of quaternary ammonium can be used as PCM for air conditioning applications. For example, Tetra-Butyl Ammonium Bromide (TBAB) forms hydrate slurries very similar to ice slurries, but with a melting point that can be adjusted from 273.15 K to 285.15 K depending on the TBAB concentration (Fig.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Selectivity of the Separation of CO₂from N₂during Crystallization of Semi-Clathrates from Quaternary Ammonium Solutions

Herri

Bouchemoua

Kwaterski

et al. 2014

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Re´sume´-Ame´lioration de la se´lectivite´du captage du CO 2 dans les semi-clathrates hydrates en utilisant les ammoniums quaternaires comme promoteurs thermodynamiques -La re´duction des e´missions de CO 2 est tre`s probablement l'un des enjeux importants de ce sie`cle. La capture puis le stockage ge´ologique de ce gaz, a`partir de sources industrielles ponctuelles et massives, est une voie d'importance. L'une des voies technologiques consiste a`utiliser les clathrates hydrates, ou semi-clathrates hydrates, qui ne´cessitent de pressuriser le gaz en amont du proce´de´. Sous pression, l'eau et les gaz forment un solide qui encapsule pre´fe´rentiellement le CO 2 , puis le gaz peut-eˆtre ensuite re´cupe´re´sous pression apre`s la dissociation du solide. L'abaissement de la pression ope´ratoire est un objectif en soi afin de faire baisser les couˆts ope´ratoires. Cet abaissement peut eˆtre obtenu par l'utilisation de promoteurs thermodynamiques, dont les sels d'ammonium quaternaires constituent une famille inte´ressante puisqu'ils forment des solides naturellement anti-agglome´rants, et plus facilement manipulables. Dans ce travail, nous pre´sentons de nouveaux re´sultats expe´rimentaux sur les e´quilibres des semi-clathrates de (CO 2 , N 2 ) en pre´sence de Tetra-n-Butyl Ammonium Bromide (TBAB). Nous donnons des mesures expe´rimentales de pression et tempe´rature en fonction de la concentration en TBAB. La pression ope´ratoire peut eˆtre abaisse´e jusqu'a`la pression atmosphe´rique. Nous donnons aussi une information supple´mentaire portant sur la composition de l'hydrate. Nous observons que la se´lectivite´du CO 2 dans les semi-clathrates hydrates est bien meilleure que pour les clathrates hydrates traditionnels, sans promoteur thermodynamique.Abstract -Enhanced Selectivity of the Separation of CO 2 from N 2 during Crystallization of SemiClathrates from Quaternary Ammonium Solutions -CO 2 mitigation is crucial environmental problem and a societal challenge for this century. CO 2 capture and sequestration is a route to solve a part of the problem, especially for the industries in which the gases to be treated are well localized. CO 2 capture by using hydrate is a process in which the cost of the separation is due to compression of gases to reach the gas hydrate formation conditions. Under pressure, the water and gas form a solid that encapsulates preferentially CO 2 . The gas hydrate formation requires high pressures and low

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Phase diagram, latent heat, and specific heat of TBAB semiclathrate hydrate crystals

Cited by 347 publications

References 6 publications

Phase equilibrium measurements for clathrate hydrates of flue gas (CO2+N2+O2) in the presence of tetra-n-butyl ammonium bromide or tri-n-butylphosphine oxide

Phase equilibrium measurements for clathrate hydrates of flue gas (CO2+N2+O2) in the presence of tetra-n-butyl ammonium bromide or tri-n-butylphosphine oxide

Clathrate Hydrates for Thermal Energy Storage in Buildings: Overview of Proper Hydrate-Forming Compounds

Enhanced Selectivity of the Separation of CO₂from N₂during Crystallization of Semi-Clathrates from Quaternary Ammonium Solutions

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Phase diagram, latent heat, and specific heat of TBAB semiclathrate hydrate crystals

Cited by 347 publications

References 6 publications

Phase equilibrium measurements for clathrate hydrates of flue gas (CO2+N2+O2) in the presence of tetra-n-butyl ammonium bromide or tri-n-butylphosphine oxide

Phase equilibrium measurements for clathrate hydrates of flue gas (CO2+N2+O2) in the presence of tetra-n-butyl ammonium bromide or tri-n-butylphosphine oxide

Clathrate Hydrates for Thermal Energy Storage in Buildings: Overview of Proper Hydrate-Forming Compounds

Enhanced Selectivity of the Separation of CO2from N2during Crystallization of Semi-Clathrates from Quaternary Ammonium Solutions

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Enhanced Selectivity of the Separation of CO₂from N₂during Crystallization of Semi-Clathrates from Quaternary Ammonium Solutions