Dissociation behavior of “dry water” C3H8 hydrate below ice point: Effect of phase state of unreacted residual water on a mechanism of gas hydrates dissociation

Драчук, А. О.; Melnikov, V. P.; Молокитина, Н. С.; Nesterov, A. N.; Поденко, Л. С.; Reshetnikov, A. M.; Manakov, Andrey Yu.

doi:10.1016/s2095-4956(15)60316-3

Cited by 13 publications

(6 citation statements)

References 19 publications

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“…Wang et al also reported that the presence of dry water reduced the induction time of methane hydrate nucleation to 5-10 min under quiescent conditions [58]. Additionally, Drachuk et al observed that an absence of an induction time for propane hydrate formation in frozen dry water compared to the typically long induction time for hydrocarbon gas hydrate [65]. This promoting effect occurred due to the enhanced guest-water contact and therefore more efficient methane diffusion into water, compared to methane hydrate formation at the methane-bulk water interface.…”

Section: Kinetic Effectmentioning

confidence: 99%

“…The use of clathrate hydrates for gas transportation requires not only fast formation kinetics, but also low pressures for safety and cost efficiency. The self-preservation effect, which is the anomalous slow dissociation kinetics and retarded gas release at atmospheric pressure and temperatures below 273 K, has been observed even though these conditions are outside the thermodynamic stability zone of the gas hydrate phase diagram [65,81,96]. This effect renders gas hydrates suitable for gas storage and transportation [107,108].…”

Section: The Effect Of Dry Water On the Self-preservation Effectmentioning

confidence: 99%

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Dry Water as a Promoter for Gas Hydrate Formation: A Review

Wei

Maeda

2023

Molecules

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Applications of clathrate hydrate require fast formation kinetics of it, which is the long-standing technological bottleneck due to mass transfer and heat transfer limitations. Although several methods, such as surfactants and mechanical stirring, have been employed to accelerate gas hydrate formation, the problems they bring are not negligible. Recently, a new water-in-air dispersion stabilized by hydrophobic nanosilica, dry water, has been used as an effective promoter for hydrate formation. In this review, we summarize the preparation procedure of dry water and factors affecting the physical properties of dry water dispersion. The effect of dry water dispersion on gas hydrate formation is discussed from the thermodynamic and kinetic points of view. Dry water dispersion shifts the gas hydrate phase boundary to milder conditions. Dry water increases the gas hydrate formation rate and improves gas storage capacity by enhancing water-guest gas contact. The performance comparison and synergy of dry water with other common hydrate promoters are also summarized. The self-preservation effect of dry water hydrate was investigated. Despite the prominent effect of dry water in promoting gas hydrate formation, its reusability problem still remains to be solved. We present and compare several methods to improve its reusability. Finally, we propose knowledge gaps in dry water hydrate research and future research directions.

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Section: Kinetic Effectmentioning

confidence: 99%

Section: The Effect Of Dry Water On the Self-preservation Effectmentioning

confidence: 99%

Dry Water as a Promoter for Gas Hydrate Formation: A Review

Wei

Maeda

2023

Molecules

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“…Carbon dioxide hydrate formed under the isochoric conditions followed by increasing temperature and decreasing pressure in the reactor. A mole of gas consumed is calculated using the difference between the number of moles of the gas at the initial time (subscripts 0) and time t 1) by the following equation [39,41,42]: -…”

Section: Effect Of Dry Gel + Thf Mixture On Gas Consumption For Co 2 Hydratementioning

confidence: 99%

Hydrate‐Based CO₂ Capture through Nano Dry Gels + Tetrahydrofuran – A Kinetic and Thermodynamic Study

Golkhou

Haghtalab

2021

Chem Eng & Technol

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The synergic effects of four combinations of nano dry gels plus tetrahydrofuran (THF) on the CO 2 capture and hydrate phase equilibrium were investigated. It was found that the hydrate phase equilibrium condition was almost identical with the mixture of nano dry gel + THF and THF solution. The gas storage capacity and CO 2 uptake rate increased significantly by THF concentration increment up to 19.06 wt % in the dry gel structure compared to a similar THF solution. The hydrate induction time decreased at higher ratios of THF. The mixture of dry gel + THF acted as a stabilizer during the hydrate dissociation process. Considering the gas storage capacity, kinetics, and thermodynamic promoting effect, a mixture including 19.06 wt % THF was favorable for hydrate-based CO 2 capture compared to the other combinations investigated in this study.

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“…The thickness of the ice crust formed on the surface of the pellets does not exceed 0.5 mm. The possibility of self-preservation of the hydrate obtained from “dry water” was demonstrated. , Dry water is a water aerosol stabilized by solid particles. It seems likely that self-preservation in this case is associated with sintering and coarsening of decomposing hydrate particles.…”

Section: Introductionmentioning

confidence: 99%

Decomposition Kinetics and Self-Preservation of Methane Hydrate Particles in Crude Oil Dispersions: Experiments and Theory

et al. 2019

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The self-preservation phenomenon may be used for storage and transportation of natural gas in the form of gas hydrate. In this work, decomposition kinetics and self-preservation of methane hydrate dispersions in two types of crude oils were studied. Hydrate particle sizes in both dispersions did not exceed 30 μm. The experiments were performed at constant temperatures from −4 to −20 °C without preliminary deep-freezing of the samples. The kinetic curves of the methane hydrate decomposition were recorded as depending on methane pressure in the autoclave vs time. In the experiments with the first dispersion, it was shown that at the decomposition degree of 50%, the hydrate decomposition rates decreased by 1–2 orders of magnitude in comparison to the rates at the start of the decomposition process; therefore, hydrate self-preservation took place. Estimated thickness of the ice shell providing self-preservation did not exceed 1.3 μm at the decomposition degree of 50%. Self-preservation was less pronounced in experiments with the second dispersion. It may be explained by the presence of the surfactant in the second dispersion, which was added to stabilize the water-in-oil emulsion from which the dispersion was obtained. Possible mechanisms and the effect of various factors on the efficiency of self-preservation are discussed in this work. A mathematical model of hydrate decomposition process taking into account self-preservation of hydrate particles in the dispersion is suggested. A time-dependent (decreasing) diffusion coefficient of methane in ice shell was used in the model.

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Dissociation behavior of “dry water” C3H8 hydrate below ice point: Effect of phase state of unreacted residual water on a mechanism of gas hydrates dissociation

Cited by 13 publications

References 19 publications

Dry Water as a Promoter for Gas Hydrate Formation: A Review

Dry Water as a Promoter for Gas Hydrate Formation: A Review

Hydrate‐Based CO₂ Capture through Nano Dry Gels + Tetrahydrofuran – A Kinetic and Thermodynamic Study

Decomposition Kinetics and Self-Preservation of Methane Hydrate Particles in Crude Oil Dispersions: Experiments and Theory

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Dissociation behavior of “dry water” C3H8 hydrate below ice point: Effect of phase state of unreacted residual water on a mechanism of gas hydrates dissociation

Cited by 13 publications

References 19 publications

Dry Water as a Promoter for Gas Hydrate Formation: A Review

Dry Water as a Promoter for Gas Hydrate Formation: A Review

Hydrate‐Based CO2 Capture through Nano Dry Gels + Tetrahydrofuran – A Kinetic and Thermodynamic Study

Decomposition Kinetics and Self-Preservation of Methane Hydrate Particles in Crude Oil Dispersions: Experiments and Theory

Contact Info

Product

Resources

About

Hydrate‐Based CO₂ Capture through Nano Dry Gels + Tetrahydrofuran – A Kinetic and Thermodynamic Study