Self-Preservation at Low Pressures of Methane Hydrates with Various Gas Contents

Giavarini, Carlo; Maccioni, Filippo

doi:10.1021/ie040038a

Cited by 67 publications

(57 citation statements)

References 11 publications

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“…The hematite reagent was pressed into a tablet (20 mm0 Â 5 mmH). Then, the tablet was sintered at 1273 K for 24 h. The carbon used for the catalyst was a high purity (ash content <100 ppm) and high density (1.77 g/cm 3 ) graphite for electrodes. The iron oxide and the carbon were crushed roughly into the range of 75 mm to 500 mm, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…Presently, many researchers are planning to develop storage and transportation systems for natural gas (methane) using gas hydrate according to this property. [3][4][5][6] Recently, the effects of liquid additives of some kind of surfactants (sodium dodecyl sulfate, linear alkyl benzene sulfonate and cetyl trimethyl ammonium bromide, 7) alkylpolyglucoside, sodium dodecyl benzene sulfonate and potassium oxalate monohydrate 8) ) on the hydrate formation and the storage capacity have been studied. In the case of solid catalyst, an activated carbon for the storage capacity has been studied by A. Celzard et al 9) and H. Najibi et al 10) In this study, we are working on the development of a catalyst for hydrate formation.…”

Section: Introductionmentioning

confidence: 99%

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Kinetics of Methane Hydrate Formation Catalyzed by Iron Oxide and Carbon under Intense Stirring Conditions

2010

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As an active surface can be a nucleation site for some reactions, the possibility of iron and carbon acting as a catalyst for methane hydrate formation has been examined in the previous study. If iron oxide and carbon can be used as a catalyst, they would have a low environmental influence and a relatively low cost. It has previously been shown that carbon and iron oxide can be used as a catalyst under weak stirring conditions. In the present study, experiments involving intense stirring were conducted for the establishment of the basis for a high production system. The proposed reaction model consisted of the mass transfers of CH 4 in the liquid films both at the gas-liquid and the liquid-solid interfaces and the diffusion in liquid water, and a chemical reaction at the liquid-solid interface. The kinetic analysis was performed using the model and the following results were obtained.The reaction was a mixed control between the mass transfer and the chemical reaction at 277 K, which was closed to the maximum temperature of methane hydrate formation thermodynamically. While in the lower temperature region lower than 275 K, the mass transfer including the diffusion of CH 4 and the apparent mass transfers in the liquid films, k 0 s was dominant. The addition of catalysts (hematite, graphite and its mixture) had acceleration effects on hydrate formation, but to varying degrees. The catalyst ''Mix'' (mixture of hematite and graphite) had the largest effect on hydrate formation over the whole stirring range. From the results of kinetic analysis, the existence of catalyst had a relatively large influence on the chemical reaction of the formation of methane hydrate.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Kinetics of Methane Hydrate Formation Catalyzed by Iron Oxide and Carbon under Intense Stirring Conditions

2010

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“…The methane hydrate formation process completed after 70 hours, and then synthetic methane hydrate collected. The methane hydrate was stored in a refrigerator to prevent the dissociation of the methane hydrate as a further cooling process, [23].…”

Section: Formation Of Methane Hydratementioning

confidence: 99%

Application of Argon Plasma Jet for Methane Hydrate Decomposition by Radio Frequency Irradiation

Rahim

Nomura

Mukasa

et al. 2017

International Journal on Advanced Science, Engineering and Information Technology

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Abstract-In this study, decomposition of methane hydrate using argon plasma jet investigated in the pressure range of 0.1MPa to 2.0MPa. The plasma generated under the high-pressure condition, which is difficult to achieve when using radio frequency (RF) plasma in the liquid method. By using emission spectrometer analysis, the excitation temperature is found to increase as the gas pressure increases, whereas, it decreases as the argon flow rate increases. During the process of plasma irradiation, the required essential reactions for methane hydrate decomposition, such as methane hydrate dissociation (MHD), steam methane reforming (SMR), and methane cracking reaction (MCR) were not completely satisfied due to an insignificant amount of methane. The gas chromatography analysis confirmed that the methane cracking reaction (MCR) was only occurred to generate hydrogen and the C (s) , due to the absence of C 2 H 2 and C 2 H 4 as the byproducts. In comparison with the other primary reactions of methane hydrate decomposition, steam methane reforming reaction became dominant in converting methane into hydrogen. Although the hydrogen production efficiency is less than that of radio frequency plasma in liquid, the reduction of CO 2 by the thermal decomposition of Teflon from CO making it possible is considered as an advanced promising technique in the future.

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“…[25] Lately, cool storage apparatuses have been produced in order to preserve gas hydrates samples and to characterise gas hydrate formation in the direct-contact cool storage process. [34,43] …”

Section: Reactors Cells and Apparatus For Hydrates Formationmentioning

confidence: 99%

Instrumental analysis of gas hydrates properties

Rojas

Lou

2009

Asia-Pacific J Chem Eng

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Gas hydrates attracted intense research interest when it was first recognised some 70 years ago that they were responsible for the blockage of flow lines, valves and well heads, thereby causing great loss of production and other severe safety hazards to the oil and gas industry. After many decades, these compounds are still the topic of research activities in various multi-disciplinary fields, including chemical and petroleum engineering, earth and geophysics, chemistry and environmental sciences. This is not only due to the great impact that these compounds have on the oil and gas industry, but also to the potential applications they have in many evolving areas, including, but not only, natural gas storage and transportation, carbon dioxide sequestration, and sea-water desalination. It is generally accepted that gas hydrates represent the largest source of hydrocarbons on earth, something which has not been appreciated until only recently.Management, either prevention or application or both, of gas hydrates requires a complete knowledge and understanding of the formation, decomposition and inhibition mechanisms of gas hydrates, which in turn demands advanced experimental methods and instrumental techniques for gas hydrate characterisation. This paper reviews a broad range of techniques that have been used for natural gas hydrate characterisation. It includes the basic physical science principles of each method and the gas hydrate properties that each method is capable of detecting, including some modern instrumental analyses that enable direct determination of gas hydrate phases and possible measurement of molecular interactions within the fluid phases. 

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Self-Preservation at Low Pressures of Methane Hydrates with Various Gas Contents

Cited by 67 publications

References 11 publications

Kinetics of Methane Hydrate Formation Catalyzed by Iron Oxide and Carbon under Intense Stirring Conditions

Kinetics of Methane Hydrate Formation Catalyzed by Iron Oxide and Carbon under Intense Stirring Conditions

Application of Argon Plasma Jet for Methane Hydrate Decomposition by Radio Frequency Irradiation

Instrumental analysis of gas hydrates properties

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