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Afanassiev, I. S.; Bezverkhy, P. P.; Martynets, V. G.; Matizen, É. V.

doi:10.1023/a:1013397407930

Cited by 5 publications

(3 citation statements)

References 3 publications

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“…The average methane fraction is close to the value reported by Afanassiev et al [20] under methane hydrate-forming conditions; they found that the equilibrium methane mole fraction 277.2 K and 5.2 MPa is 1.7 × 10 −3 if methane hydrates were not formed. Roy et al [21] and Serra et al [22] reported that the solubility of gas in SDS solution is similar to that in pure water at aqueous SDS concentrations below the CMC.…”

Section: Methane Fraction In Sds Solution At 275 K and 528 Mpasupporting

confidence: 89%

Does SDS micellize under methane hydrate-forming conditions below the normal Krafft point?

Zhang

Lee

2007

Journal of Colloid and Interface Science

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Section: Methane Fraction In Sds Solution At 275 K and 528 Mpasupporting

confidence: 89%

Does SDS micellize under methane hydrate-forming conditions below the normal Krafft point?

Zhang

Lee

2007

Journal of Colloid and Interface Science

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“…Actually, some authors have reported that the most probable place for hydrate formation and growth is a water layer, adjacent to the interface, with a thickness of a few tens of micrometers. [19][20][21] Therefore, in a real system, and for finely dispersed water droplets, the thickness of this water layer and the size of the droplets can be commensurable, and then hydrates can form and grow at any point within these droplets, exactly as in a THF system. For larger water droplets, hydrates will form a shell surrounding a water core.…”

Section: Resultsmentioning

confidence: 99%

Hydrate Plug Prevention by Quaternary Ammonium Salts

2005

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The use of low-dosage inhibitors is an alternative to thermodynamic inhibitors to prevent gas hydrates from plugging oil production pipelines. In this work, quaternary ammonium salts (QAs) with different structures were tested as hydrate plug inhibitors on model systems containing 1/1/4/X proportions (by weight) of water/THF/oil/QA systems. The experimental results suggest that the presence of both small (CH3) groups in their polar moiety and two long alkyl chains in their hydrophobic part has a beneficial effect on their ability to adsorb onto the hydrate surface and form a steric barrier around the hydrate crystals, which limits their agglomeration to larger masses. Above a minimum concentration, the concentration of the double-tailed QAs has no appreciable effect on their ability to prevent hydrates from plugging. Their effectiveness as hydrate plug inhibitors is not dependent on the chain length of the oil.

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“…Thus, the fourfold increase in the k app 's is coming from the increased gas−liquid interfacial area, A g - l , as water converts to hydrates. It should be noted that the D , k , and H in eq 5 slightly depend on the temperature in the crystal-growth zone; , thus, they do not change much during hydrate growth, since the increase in the temperature is never >8 K in all runs. Therefore, the k app is predominantly determined by the gas−liquid interfacial area, A g - l…”

Section: Hydrate Growth Rate Constantmentioning

confidence: 99%

Kinetics of Methane Hydrate Formation from SDS Solution

Zhang

Lee

2007

Ind. Eng. Chem. Res.

267

202

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The role of sodium dodecyl sulfate (SDS) in methane hydrate formation is investigated in a nonstirred batch reactor. Addition of SDS reduces the induction time, but no systematic trend is observed between induction times and SDS concentrations. The hydrate growth is analyzed by using a diffusion-reaction kinetics model with an assumption that crystallization occurs only in the liquid film at the gas-liquid interface. At the start of hydrate growth, the apparent rate constant increases linearly with increasing aqueous SDS concentrations. The apparent rate constant during hydrate growth increases as more available gas-liquid interface is generated. SDS not only increases hydrate nucleation rate by reducing the interfacial tension between hydrate and liquid but also accelerates hydrate growth rate by increasing the total surface area of hydrate particles and the gas-liquid interfacial area.

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Cited by 5 publications

References 3 publications

Does SDS micellize under methane hydrate-forming conditions below the normal Krafft point?

Does SDS micellize under methane hydrate-forming conditions below the normal Krafft point?

Hydrate Plug Prevention by Quaternary Ammonium Salts

Kinetics of Methane Hydrate Formation from SDS Solution

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