Nucleation of gas hydrates

Kashchiev, Dimo; Firoozabadi, Abbas

doi:10.1016/s0022-0248(02)01576-2

Cited by 315 publications

(336 citation statements)

References 30 publications

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“…Gas which is in the free state and water under particular thermobaric conditions practically is always formed by gas hydrates. But in a coal matrix of a molecule of gas and water are polarized under the influence of electrical dipole moment [4][5][6]. In the course of formation of gas hydrate water molecules which energy exceeds bond energy with the surface of coal can participate.…”

Section: Methodsmentioning

confidence: 99%

Gas Hydrates of Coal Layers as a Methane Source in the Atmosphere and Mine Working

2017

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Abstract. Living conditions of gas hydrates of a methane in a coal matrix as one of possible forms of finding of molecules of a methane in coal layers are considered. However, gas hydrates are formed not in all mineral coals even under the thermobaric conditions corresponding to their equilibrium state as the minimum humidity and the corresponding pore width are necessary for each brand of coal for formation of gas hydrate. It is shown that it depends on electric electrical dipole moment of a macromolecule of coal. Coals of brands K, D, Zh were considered. The electric field created by the surface of coal does not allow molecules of water to carry out threedimensional driving, and they keep on an internal surface of a time. By means of theoretical model operation a dipole -dipole interaction of molecules of water with the steam surface of coal values of energy of fiber interaction for various functional groups located in coal "fringe" which size for the first and second layers does not allow molecules of water to participate in formation of gas hydrates are received. For coals of brands K, Zh, D, considering distribution of a time on radiuses, the percent of moisture, which cannot share in education solid coal of gas solutions, is calculated.

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Section: Methodsmentioning

confidence: 99%

Gas Hydrates of Coal Layers as a Methane Source in the Atmosphere and Mine Working

2017

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“…Areas of n-shaped units of hydrated lens are shown in Figure 2 together with "humidification angles" ( and 0 equation 15, 16) with respect to each phase where  is the specific surface energy of the interface solution-hydrate, sg is the specific surface energy of the interface-solutiongas, hg is the specific surface energy of the hydrate-gas. In the case of lens-type clusters, the "humidification angles" are shown in [5,11] as follows: The values of the specific surface energies used in the above calculation are founded in Table 1. At the stage of the solution and the finishing phase there is an experimental device, shown in Figure 3.…”

Section: Introductionmentioning

confidence: 99%

“…At the stage of the solution and the finishing phase there is an experimental device, shown in Figure 3. The device will serve to create hydrates under laboratory conditions and in the following to compare actual consumption of energy consumed by the device with theoretical values [5][6][7][8][9][10][11][12][13][14]. …”

Section: Introductionmentioning

confidence: 99%

Modeling the Production of Natural Gas Hydrates in Laboratory Conditions

2018

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“…In the case of no disturbance, few hydrates are generated only at the gas-liquid interface [12]. Although the ideal hydrate formation rate can be obtained by mechanical stirring, the mechanical reliability problems caused by high-pressure mixing and liquid viscosity increased in the later period of the formation of gas hydrate [13].…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Methane Hydrate Formation in an Aqueous Solution with and without Kinetic Promoter (SDS) by Spray Reactor

Tian

Hong-ping

et al. 2017

Journal of Chemistry

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Hydrate formation apparatus reported so far was mainly concentrated in stirred-tank batch environments. It was difficult to produce the high gas storage hydrate efficiently. Some nonstirred technology has been attracting more attention by researchers. This work proposed a new apparatus for hydrate formation by spraying water into a gaseous phase with a fine nozzle. It can get sufficient contact surface area for gas-liquid reaction. Methane hydrate formation experiments have been conducted using pure water and sodium dodecyl sulfate (SDS) aqueous solution for comparison at 277.15 K. The experiments were conducted at 7.0 and 6.0 MPa, respectively. Kinetics of methane hydrate formation have been investigated by methane consumption per mole of water and reaction rate. The mechanism of hydrate formation and kinetics property by spraying atomization were studied with the theory of crystal chemistry.

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Nucleation of gas hydrates

Cited by 315 publications

References 30 publications

Gas Hydrates of Coal Layers as a Methane Source in the Atmosphere and Mine Working

Gas Hydrates of Coal Layers as a Methane Source in the Atmosphere and Mine Working

Modeling the Production of Natural Gas Hydrates in Laboratory Conditions

Kinetics of Methane Hydrate Formation in an Aqueous Solution with and without Kinetic Promoter (SDS) by Spray Reactor

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