Phase equilibrium data on carbon dioxide hydrate in the presence of electrolytes, water soluble polymers and montmorillonite

Englezos, Peter; Hall, Stephen B.

doi:10.1002/cjce.5450720516

Cited by 104 publications

(69 citation statements)

References 18 publications

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“…For comparison, the top and base of the MHSZ for the pure-water pure-methane case are also shown in Figure 1. Figure 1 shows that the MHSZB (MHSZB-1) for the pure-methane seawater case (Stabiliy-1) is shallower than that base (MHSZB-2) for the pure-methane pure-water case (Stabillity-2), which is identical with previous results [20,30,36,37] . In other words, water in marine gas hydrate systems contains dissolved salts, which reduces the stability of gas hydrate.…”

Section: Effects Of Salinity On the Mhszsupporting

confidence: 85%

“…For the pressure range of 2.75-10.0 MPa, at any given pressure, the dissociation temperature of methane hydrate is depressed by approximately -1.1℃ relative to the pure methane-pure water system [29] . The phase equilibria of hydrate under conditions that are relevant to marine environments have been also studied for three-phase equilibrium between hydrate, free gas, and seawater [29][30][31] . The conditions for twophase equilibrium between hydrate and salt water were also investigated by Zatsepina and Buffet [21] .…”

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confidence: 99%

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Effects of salinity on methane gas hydrate system

Yang

2007

SCI CHINA SER D

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Using an approximately analytical formation, we extend the steady state model of the pure methane hydrate system to include the salinity based on the dynamic model of the methane hydrate system. The top and bottom boundaries of the methane hydrate stability zone (MHSZ) and the actual methane hydrate zone (MHZ), and the top of free gas occurrence are determined by using numerical methods and the new steady state model developed in this paper. Numerical results show that the MHZ thickness becomes thinner with increasing the salinity, and the stability is lowered and the base of the MHSZ is shifted toward the seafloor in the presence of salts. As a result, the thickness of actual hydrate occurrence becomes thinner compared with that of the pure water case. On the other hand, since lower solubility reduces the amount of gas needed to form methane hydrate, the existence of salts in seawater can actually promote methane gas hydrate formation in the hydrate stability zone. Numerical modeling also demonstrates that for the salt-water case the presence of methane within the field of methane hydrate stability is not sufficient to ensure the occurrence of gas hydrate, which can only form when the methane concentration dissolved in solution with salts exceeds the local methane solubility in salt water and if the methane flux exceeds a critical value corresponding to the rate of diffusive methane transport. In order to maintain gas hydrate or to form methane gas hydrate in marine sediments, a persistent supplied methane probably from biogenic or thermogenic processes, is required to overcome losses due to diffusion and advection. methane gas hydrate, solubility, stability of hydrate, salinity, phase equilibrium Methane gas hydrate (MGH) is an ice-like crystalline compound of water and gas molecules [1,2] that forms at low temperature and high pressure when the dissolved methane concentration exceeds the local solubility [2] . The formation of methane hydrate can extract water and methane gas reserved in porous media. Under suitable temperature and pressure conditions liquid water in pores and methane dissolved in water may transform into solid hydrate. The formation of solid hydrate can increase the strength of sediments and result in lowering porosity and permeability [3] . Reversely, when the gas hydrate system is not stable, solid hydrate can be decomposed into water and methane. It is stable under elevated or relatively high pressure and low temperature conditions such as those found in the marine sediments along continental margins and permafrost regions [4,5] . The gas hydrate stability depends on the water depth (pressure) and temperature. Decreasing pressure caused by lowering the sea level or increasing seawater temperature causes the hydrate dissociation, resulting in the geologic hazards of seafloor sloping [6] and releasing "greenhouse" gas (main methane gas) including in hydrate further resulting in the global climate change [7] . In a word, changes of temperature and pressure cause the transformation between sol...

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Section: Effects Of Salinity On the Mhszsupporting

confidence: 85%

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confidence: 99%

Effects of salinity on methane gas hydrate system

Yang

2007

SCI CHINA SER D

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“…Roberts et al (1940) 259-286 16-108 5 Deaton & Frost (1946) 262-286 18-98 18 Kobayashi & Katz (1949) 295-302 340-775 4 Mcleod & Campbell (1961) 285-302 96-681 9 Marshall et al (1964) 290-320 160-4000 20 Jhaveri & Robinson (1965) 273-294 26-286 8 Galloway et al (1970) 283-289 71-131 4 Verma (1974) 275-291 30-186 7 Falabella (1975) 149-193 0.05-1.01 6 de Roo et al (1983) 273-286 27-100 9 Thakore & Holder (1987) 275-281 28-61 6 Adisasmito et al (1991) 273-286 27-106 11 Makogon & Sloan (1994) 190-262 0.8-18 6 Mei et al (1996) 274-285 30-90 12 Nakano et al (1999) 305-320.5 980-5000 16 Yang et al (2001) 276-286 36-97 10 Jager & Sloan (2001) 291-303 201-723 12 a Number of measurements. Unruh & Katz (1949) 277-283 20-45 5 Larson (1955) 257-283 5-45 45 Miller & Smythe (1970) 151-192 0.005-0.22 8 Robinson & Mehta (1971) 274-283 13-45 7 Falabella (1975) 194-218 0.25-1.01 5 Ng & Robinson (1985) 279-284 27-144 9 Takenouchi & Kennedy (1965) 283-293 45-1900 15 Adisasmito et al (1991) 274-283 14-44 9 Dholabhai et al (1993) 273-279 13-25 4 Englezos & Hall (1994) 275-283 15-42 6 Breland & Englezos (1996) 275-280 16-30 3 Nakano et al (1998) 289-294 1000-3300 13 Fan & Guo (1999) 273-283.6 13-129 13 Wendland et al (1999) 271-283 10-45 9 Seo & Lee (2001) 274-283 15-45 5 a Number of measurements.…”

Section: T-rangementioning

confidence: 98%

Prediction of CH4 and CO2 hydrate phase equilibrium and cage occupancy from ab initio intermolecular potentials

Sun

Duan

2005

Geochimica et Cosmochimica Acta

180

123

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“…CO 2 hydrate equilibrium conditions have been widely investigated. Wendland et al [7], Yang et al [8], Englezos et al [9], Breland et al [10], Dholabhai et al [11,12], Kang et al [13], Mohammadi et al [14] investigated the CO 2 hydrate phase equilibrium in water with different additives. The studies concerning CO 2 hydrate equilibrium in porous medium are also familiar.…”

Section: Open Accessmentioning

confidence: 99%

Characteristics of CO2 Hydrate Formation and Dissociation in Glass Beads and Silica Gel

2014

Carbon Capture and Storage

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CO 2 hydrate formation and dissociation is crucial for hydrate-based CO 2 capture and storage. Experimental and calculated phase equilibrium conditions of carbon dioxide (CO 2 ) hydrate in porous medium were investigated in this study. Glass beads were used to form the porous medium. The experimental data were generated using a graphical method. The results indicated the decrease of pore size resulted in the increase of the equilibrium pressure of CO 2 hydrate. Magnetic resonance imaging (MRI) was used to investigate the priority formation site of CO 2 hydrate in different porous media, and the results showed that the hydrate form firstly in BZ-02 glass beads under the same pressure and temperature. An improved model was used to predict CO 2 hydrate equilibrium conditions, and the predictions showed good agreement with experimental measurements.

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Phase equilibrium data on carbon dioxide hydrate in the presence of electrolytes, water soluble polymers and montmorillonite

Cited by 104 publications

References 18 publications

Effects of salinity on methane gas hydrate system

Effects of salinity on methane gas hydrate system

Prediction of CH4 and CO2 hydrate phase equilibrium and cage occupancy from ab initio intermolecular potentials

Characteristics of CO2 Hydrate Formation and Dissociation in Glass Beads and Silica Gel

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