Phase Equilibria and Methane Enrichment of Clathrate Hydrates of Mine Ventilation Air + Tetrabutylphosphonium Bromide

Du, Jun; Li, Huijuan; Wang, Liguang

doi:10.1021/ie5000664

Cited by 25 publications

(27 citation statements)

References 42 publications

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“…The reliability and accuracy of our experimental system was given in our recent studies [26,30], which showed excellent agreement between our phase equilibrium data of TBAB + H 2 O + N 2 or CH 4 and those reported by other research groups. In the present work, the phase equilibrium conditions of ventilation air methane hydrate and ventilation air methane + TBAB or TBPO semi-clathrate hydrate at 5 wt%, 15 wt% and 26 wt% are tabulated in Table 1 [30,33].…”

Section: Thermodynamic Stability Conditionssupporting

confidence: 86%

“…Fig. 1 illustrates a schematic diagram of the apparatus, which is essentially the same as in our recent hydrate phase equilibrium studies [26,30]. Briefly, the temperature inside the reactor can be controlled precisely at 0.1 K. A temperature sensor was inserted into the reactor to measure the temperature of the tested liquid or hydrate phase with an uncertainty of ± 0.03 K. A pressure transducer with accuracy of ± 0.01 MPa was used to measure the gas pressure inside the reactor.…”

Section: Phase Equilibrium Measurementmentioning

confidence: 99%

“…MPa with using the isochoric equilibrium step-heating pressure search method, and more detailed information can be found elsewhere [26,30].…”

Section: Phase Equilibrium Measurementmentioning

confidence: 99%

“…And their results suggest that enrichment of methane from MVA can be achieved using the hydratedbased gas separation method. Our recent experimental work has demonstrated the possibility of enriching methane from MVA [26]; however, the required dosage of the tested hydrate promoter, tetra-butyl phosphonium bromide (TBPB), for effectively reducing the hydrate phase equilibrium pressure was high, at 37 wt%.…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamic stability conditions, methane enrichment, and gas uptake of ionic clathrate hydrates of mine ventilation air

Wang

2015

Chemical Engineering Journal

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Abatement of methane from mine ventilation air (MVA) is a significant challenge faced by coal mining industry. A promising method for methane capture from gas mixture is clathrate hydrate formation. In search of suitable and costeffective low-dosage promoters for hydrate-based methane capture processes, this paper reports the pressure requirement for the hydrate formation of simulated MVA (0.5 vol% CH 4 + 99.5 vol% air) and its potential for methane extraction, in the presence of tri-n-butyl phosphine oxide (TBPO) or tetra-n-butyl ammonium bromide (TBAB) at three different initial loadings (5 wt%, 15 wt%, and 26 wt%). An isochoric equilibrium step-heating pressure search method was used to measure the hydrate phase equilibrium conditions at the temperature range of (277.61 to 295.54) K and pressure range of (0.23 to 19.11) MPa. It was found that at a given initial loading, TBPO was largely more effective than TBAB in reducing the pressure requirement for hydrate formation of MVA. At a given temperature, the equilibrium pressures of the clathrate hydrates were indifferent to the change in the initial loading of TBPO from 5 wt% to 26 wt%, in contrast to those of TBAB. Gas composition analysis by gas chromatography confirmed that CH 4 could be significantly enriched in the ionic clathrate hydrates, and the highest methane enrichment ratio obtained in the present work was 300%, with TBPO at initial loading of 5 wt%. At this relatively low loading, within a given period of 5 hours, TBPO also led to higher gas uptake compared with TBAB. The advantages of TBPO as a promoter of MVA hydrate were discussed.

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Section: Thermodynamic Stability Conditionssupporting

confidence: 86%

Section: Phase Equilibrium Measurementmentioning

confidence: 99%

“…MPa with using the isochoric equilibrium step-heating pressure search method, and more detailed information can be found elsewhere [26,30].…”

Section: Phase Equilibrium Measurementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermodynamic stability conditions, methane enrichment, and gas uptake of ionic clathrate hydrates of mine ventilation air

Wang

2015

Chemical Engineering Journal

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“…The schematic diagram of the experimental apparatus and its details can be found elsewhere [47,48]. Briefly, the high pressure reactor used in the present work was a home-made non-visual 102 ml stainless steel cylindrical vessel with inside diameter of 38 mm and depth of 90 mm.…”

Section: Experimental Apparatusmentioning

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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Development of Combustion Technology for Methane Emitted from Coal‐Mine Ventilation Air Systems

2017

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Fugitive gas emissions from coal mining are widely known to be significant contributors to the emission of alkanes, mainly methane, to the environment. Utilization of coal‐mine ventilation air methane (VAM) is a crucial mission to minimize methane emission in the atmosphere. This paper reviews current technology for mitigation and utilization of methane emissions from coal mining. Challenges and opportunities for each technology are discussed together with their benefits/disadvantages. Catalytic combustion technology is recommended as the best option due to the low and variable concentration of methane in coal‐mine ventilation air, as well as its high volumetric flow. Herein, current developments in flameless combustion are discussed in detail with a few highlights on palladium‐based catalyst development. The remaining uncertainties and obstacles in the development of palladium‐based catalysts for VAM are also discussed. This paper highlights a few important practical aspects that necessitate further detailed investigation, such as catalyst deactivation phenomena, the stability of the catalyst under humid conditions, and the effect of coal dust on catalytic activity and stability. Notably, a pressure decrease, heat recovery/self‐sustaining, and long‐term deactivation are key for the successful development of VAM catalytic combustors.

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Phase Equilibria and Methane Enrichment of Clathrate Hydrates of Mine Ventilation Air + Tetrabutylphosphonium Bromide

Cited by 25 publications

References 42 publications

Thermodynamic stability conditions, methane enrichment, and gas uptake of ionic clathrate hydrates of mine ventilation air

Thermodynamic stability conditions, methane enrichment, and gas uptake of ionic clathrate hydrates of mine ventilation air

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

Development of Combustion Technology for Methane Emitted from Coal‐Mine Ventilation Air Systems

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