“Self-Preservation” of Methane Hydrate in Pure Water and (Water + Diesel Oil + Surfactant) Dispersed Systems

Theoretical approach was developed for description of clathrate hydrates stability area at low and modestly high temperatures on molecular level. The approach permits to account for interactions between guest molecules and dependence of unit cell structure upon guest's sort, temperature and pressure. Non-ideality of the gas phase was accounted using Van-der-Waals equation of state. Within this approach, methane hydrate calculations have been performed both for low temperature and low pressure region (in equilibrium with ice Ih) and for modestly high temperatures and pressures (in equilibrium with liquid pure water). Calculations show the notable dependence of hydrates thermodynamic properties upon the guest-guest interactions. For methane hydrates, the guest-guest interaction energy can reach 10% of the guest-host value. The results of calculations are in good agreement with available experimental data. This method is applicable for accurate prediction of clathrate hydrate stability in a wide range of P–T conditions.

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Research of Surfactants Effect on Methane Hydrate Formation with Properties of Biochemical Materials

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.675.284 ◽

2013 ◽

Vol 675 ◽

pp. 284-288 ◽

Cited By ~ 1

Author(s):

Bin Dou ◽

Hui Gao ◽

Lei Ren

Keyword(s):

Sodium Dodecyl Sulfate ◽

Methane Hydrate ◽

Pure Water ◽

Sodium Dodecyl ◽

Water System ◽

Hydrate Formation ◽

Liquid Pool ◽

Pool Surface ◽

Dodecyl Sulfate ◽

Gas Consumption

This paper deals with the effects of a surfactant additive on the formation of methane hydrate in water system with and without sodium dodecyl sulfate (SDS). The properties of sodium dodecyl sulfate are listed. The results manifested that the presence of SDS could not only accelerate the hydrate formation process, but also increase the partition coefficient of methane between hydrate and vapor drastically. The paper then describes our experimental observations of the hydrate formation from methane, to show how the hydrate formation behaviors are affected by the additives of chamber partially filled with a quiescent pool of water (pure water or an aqueous SDS solution) to compensate for the gas consumption due to the hydrate formation, thereby maintaining a constant pressure inside the chamber. The results revealed that the addition of SDS not only on the liquid-pool surface but also on the chamber walls above the level of the pool surface, leaving the bulk of the liquid pool free from hydrate crystals. An excessive addition of SDS beyond the solubility was found to cause a decrease in the rate of hydrate formation but an increase in the final level of the water-to-hydrate conversion.

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A New Generalized Empirical Correlation for Predicting Methane Hydrate Equilibrium Conditions in Pure Water

Industrial & Engineering Chemistry Research ◽

10.1021/acs.iecr.0c05833 ◽

2021 ◽

Author(s):

Nithin B. Kummamuru ◽

Patrice Perreault ◽

Silvia Lenaerts

Keyword(s):

Methane Hydrate ◽

Pure Water ◽

Empirical Correlation ◽

Equilibrium Conditions

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Improving methane hydrate formation in highly water-saturated fixed bed with diesel oil as gas channel

Chemical Engineering Journal ◽

10.1016/j.cej.2019.02.139 ◽

2019 ◽

Vol 368 ◽

pp. 299-309 ◽

Cited By ~ 2

Author(s):

Peng Xiao ◽

Xiao-Mei Yang ◽

Wen-Zhi Li ◽

Jin-Long Cui ◽

Chang-Yu Sun ◽

...

Keyword(s):

Methane Hydrate ◽

Fixed Bed ◽

Hydrate Formation ◽

Diesel Oil ◽

Gas Channel ◽

Water Saturated

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Kinetics of Methane Hydrate Formation in the Presence of 1-Dodecyl-2-pyrrolidinone and Tetrahydrofuran in Pure Water

Industrial & Engineering Chemistry Research ◽

10.1021/acs.iecr.1c00925 ◽

2021 ◽

Author(s):

Chandan Sahu ◽

Anirbid Sircar ◽

Jitendra S. Sangwai ◽

Rajnish Kumar

Keyword(s):

Methane Hydrate ◽

Pure Water ◽

Hydrate Formation ◽

Kinetics Of

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

Journal of Chemistry ◽

10.1155/2017/5208915 ◽

2017 ◽

Vol 2017 ◽

pp. 1-5 ◽

Cited By ~ 5

Author(s):

Yaqin Tian ◽

Yugui Li ◽

Hongping An ◽

Jie Ren ◽

Jianfeng Su

Keyword(s):

Aqueous Solution ◽

Methane Hydrate ◽

Reaction Rate ◽

Pure Water ◽

Sodium Dodecyl ◽

Hydrate Formation ◽

Gas Storage ◽

Liquid Reaction ◽

New Apparatus ◽

Kinetics Of

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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