Recovery of CH4 from coal mine model gas mixture (CH4/N2) by hydrate crystallization in the presence of cyclopentane

Zhong, Dong‐Liang; Daraboina, Nagu; Englezos, Peter

doi:10.1016/j.fuel.2013.01.029

Cited by 111 publications

(70 citation statements)

References 22 publications

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“…Thus, the larger amount of CP results in more gas enclosed to form hydrates and a faster hydrate formation rate. This phenomenon is similar to that reported by Zhong et al 20,21 As shown in Figure 4a, the number of moles of CH 4 consumed during hydrate formation increases as the CP/liquid phase volume ratio increases from 0.03 to 0.15 before approximate 3000 s. However, with the increase of the reaction time, the number of moles of CH 4 consumed continues increasing only with the CP/liquid phase volume ratio of 0.05 and the total CH 4 consumption is the largest. A similar phenomenon exists in Figure 4b, with the number of moles of gas consumed during hydrate formation increasing as the CP/liquid phase volume ratio increases from 0.03 to 0.15 before 2400 s. However, the number of moles of CH 4 consumed keeps increasing only with the CP/liquid phase volume ratio of 0.05 with the increase of the reaction time.…”

Section: Resultssupporting

confidence: 92%

Formation Kinetics of Cyclopentane + Methane Hydrates in Brine Water Systems and Raman Spectroscopic Analysis

Lv¹,

Li³

et al. 2015

Energy Fuels

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The kinetics of the formation of cyclopentane (CP) + methane (CH 4 ) hydrates are studied to find the optimum condition for the rapid hydrate formation under the submarine condition (NaCl mass fraction of 0.035, around 277.15 K and 12 MPa). The influences of the CP/liquid phase volume ratio and the volume of the liquid phase on the amount of gas uptake and CH 4 consumption rate are determined. The results show that the high volume ratio of CP/liquid phase is favorable for the rapid formation of CP + CH 4 hydrates. There is an optimal ratio of the liquid phase volume for obtaining the highest gas consumption. Raman spectrum analyses for CP + CH 4 hydrates are carried out to examine the hydrate structure and guest molecule occupation. The results show that CP mainly occupies the large cavities (5 12 6 4 ) and CH 4 is encapsulated in the small cavities (5 12 ) of the structure II hydrates. When the volume ratio of the CP/liquid phase is 0.05, CP with CH 4 also occupies the large cavities (5 12 6 4 ).

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Section: Resultssupporting

confidence: 92%

Formation Kinetics of Cyclopentane + Methane Hydrates in Brine Water Systems and Raman Spectroscopic Analysis

Lv¹,

Li³

et al. 2015

Energy Fuels

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“…[11][12][13][14][15][16] Also, differences in structural and thermodynamic properties of different molecules in the hydrate form can potentially be exploited for the design of alternative separation processes for energy 17,18 or environmentally related [19][20][21] gas mixtures. Furthermore, hydrate growth results in ion exclusion from the crystal structure, a process that can be used for water purification and desalination.…”

Section: Introductionmentioning

confidence: 99%

Prediction of the phase equilibria of methane hydrates using the direct phase coexistence methodology

Michalis

Costandy

Tsimpanogiannis

et al. 2015

The Journal of Chemical Physics

125

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The direct phase coexistence method is used for the determination of the three-phase coexistence line of sI methane hydrates. Molecular dynamics (MD) simulations are carried out in the isothermal-isobaric ensemble in order to determine the coexistence temperature (T3) at four different pressures, namely, 40, 100, 400, and 600 bar. Methane bubble formation that results in supersaturation of water with methane is generally avoided. The observed stochasticity of the hydrate growth and dissociation processes, which can be misleading in the determination of T3, is treated with long simulations in the range of 1000-4000 ns and a relatively large number of independent runs. Statistical averaging of 25 runs per pressure results in T3 predictions that are found to deviate systematically by approximately 3.5 K from the experimental values. This is in good agreement with the deviation of 3.15 K between the prediction of TIP4P/Ice water force field used and the experimental melting temperature of ice Ih. The current results offer the most consistent and accurate predictions from MD simulation for the determination of T3 of methane hydrates. Methane solubility values are also calculated at the predicted equilibrium conditions and are found in good agreement with continuum-scale models.

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“…Recently, natural gas was successfully extracted from gas hydrate in the seafloor in Pacific waters off Japan during the hydrate exploitation research program, which provided direct evidence for the possibility of gas production from natural oceanic hydrate deposits. In addition, the crystallization process of hydrate formation has also been proved to be an effective way in methane separation or CO 2 capture from mixture gases [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of methane hydrate decomposition experiments by depressurization around freezing point in porous media

Liang

et al. 2015

Fuel

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Recovery of CH4 from coal mine model gas mixture (CH4/N2) by hydrate crystallization in the presence of cyclopentane

Cited by 111 publications

References 22 publications

Formation Kinetics of Cyclopentane + Methane Hydrates in Brine Water Systems and Raman Spectroscopic Analysis

Formation Kinetics of Cyclopentane + Methane Hydrates in Brine Water Systems and Raman Spectroscopic Analysis

Prediction of the phase equilibria of methane hydrates using the direct phase coexistence methodology

Numerical analysis of methane hydrate decomposition experiments by depressurization around freezing point in porous media

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