Stability and growth of gas hydrates below the ice–hydrate–gas equilibrium line on the P–T phase diagram

Melnikov, V. P.; Nesterov, A. N.; Reshetnikov, A. M.; Истомин, В. А.; Kwon, V.G.

doi:10.1016/j.ces.2009.09.041

Cited by 62 publications

(55 citation statements)

References 30 publications

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“…Reversible dissociation of metastable hydrates into supercooled water and gas It was previously shown using optical spectroscopy that metastable hydrates could grow on the surface of single small droplets of supercooled liquid water or dissociate into supercooled water and gas below the pressure of the L sw -H-G metastable equilibrium (Melnikov et al, 2010(Melnikov et al, , 2011. Below, data on the behaviour of bulk Freon-12 hydrate in the region of its metastability obtained from NMR measurements are presented.…”

Section: Resultsmentioning

confidence: 98%

“…For example, metastable diamond at room temperature can live virtually infinitely. Melnikov et al (2010) observed the existence of methane hydrate in the region of its metastability at 268 K without any evidence of the hydrate dissociation into ice and gas over at least 14 days. Longer experiments were not performed, but when the pressure was decreased below the pressure of the L sw -H-G metastable equilibrium, the hydrate dissociated into supercooled water and gas without any delay.…”

Section: Introductionmentioning

confidence: 94%

“…Subsequently, the possibility of hydrate dissociation into supercooled water and gas was confirmed for the hydrates of methane, ethane, carbon dioxide, and Freon-12 (CCl 2 F 2 ) using optical microscopy observations (Melnikov et al, 2009(Melnikov et al, , 2010(Melnikov et al, , 2011, Raman (Ohno et al, 2011) and pulsed NMR (Melnikov et al, 2012 spectroscopy, and differential thermal analysis (DTA) Melnikov et al, 2015). Hence, we can conclude that the possibility gas hydrates dissociating below the ice melting point into supercooled water and gas is a universal property common to gas hydrates.…”

Section: Introductionmentioning

confidence: 94%

“…1, the L sw -H-G metastable equilibrium line is in actuality an extension of the liquid water-hydrate-gas (L w -H-G) equilibrium line into the temperature region below 273 K in the p-T phase diagram (Mel'nikov et al, 2007;Melnikov et al, 2009Melnikov et al, , 2010Melnikov et al, , 2011Ohno et al, 2011;Vlasov et al, 2013). The region in the p-T phase diagram between the I-H-G equilibrium line and the L sw -H-G metastable equilibrium line is the hydrate metastability region.…”

Section: Introductionmentioning

confidence: 97%

“…The region in the p-T phase diagram between the I-H-G equilibrium line and the L sw -H-G metastable equilibrium line is the hydrate metastability region. In this region, hydrates may exist as a long-lived phase in the metastable state without dissociation into ice and gas (Melnikov et al, 2010).…”

Section: Introductionmentioning

confidence: 98%

See 4 more Smart Citations

Study of gas hydrate metastability and its decay for hydrate samples containing unreacted supercooled liquid water below the ice melting point using pulse NMR

Мадыгулов

Nesterov

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et al. 2015

Chemical Engineering Science

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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 98%

See 3 more Smart Citations

Study of gas hydrate metastability and its decay for hydrate samples containing unreacted supercooled liquid water below the ice melting point using pulse NMR

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et al. 2015

Chemical Engineering Science

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Increasing the Storage Capacity and Selectivity in the Formation of Natural Gas Hydrates Using Porous Media

et al. 2012

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Formation of a gas hydrate with two different gas compositions (natural gas and a mixture of methane-ethane-propane) was investigated using a special method of producing the hydrate from ice. Gas uptake, splitting the fraction of each component between the gas phase and hydrate phase, and purification of methane were studied in the presence of silica-based porous media. Addition of a small amount of colloidal silica media increased considerably the gas storage capacity of the hydrate phase. In the presence of silica-based porous media, the purification factor of CH 4 became significantly higher. The results can provide the basis for the storage of natural gas in hydrate form and application of the hydratebased gas separation technology to achieve methane with high purity from natural gas.

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Modeling thermal regime and evolution of the methane hydrate stability zone of the Yamal peninsula permafrost

Arzhanov

Malakhova

Мохов

2020

Permafrost & Periglacial

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In recent years, new geophysical phenomena have been observed in the highlatitude regions of continental permafrost. Since 2014 new craters 10-20 m in diameter have been found within the Yamal Peninsula and neighboring regions. They are associated with the emissions of gases, which could have been formed during dissociation of relict gas hydrate deposits due to increases in soil temperature. This paper presents the results of numerical modeling of the thermal regime of permafrost in the north of Western Siberia with the assessment of methane hydrate stability zone under climate changes over the past 130,000 years. According to the results obtained, the upper boundary of the methane hydrate stability zone in Yamal could have reached the surface within the periods of glacial maxima (about 90,000 and 60,000 years ago). We show that at present in Yamal permafrost above the modern boundary of the stability zone, relic methane hydrates are likely to exist at depths of up to 100-150 m, they could have "survives" warming during the Holocene optimum about 6,000 years ago and remain in permafrost rocks under negative temperatures even under transgression and increased geothermal flux conditions.

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Stability and growth of gas hydrates below the ice–hydrate–gas equilibrium line on the P–T phase diagram

Cited by 62 publications

References 30 publications

Study of gas hydrate metastability and its decay for hydrate samples containing unreacted supercooled liquid water below the ice melting point using pulse NMR

Study of gas hydrate metastability and its decay for hydrate samples containing unreacted supercooled liquid water below the ice melting point using pulse NMR

Increasing the Storage Capacity and Selectivity in the Formation of Natural Gas Hydrates Using Porous Media

Modeling thermal regime and evolution of the methane hydrate stability zone of the Yamal peninsula permafrost

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