Dissociation Behavior of Methane−Ethane Mixed Gas Hydrate Coexisting Structures I and II

2010 ◽  
Vol 114 (35) ◽  
pp. 9456-9461 ◽  
Author(s):  
Masato Kida ◽  
Yusuke Jin ◽  
Nobuo Takahashi ◽  
Jiro Nagao ◽  
Hideo Narita
Keyword(s):  
Gas Hydrate ◽  
Mixed Gas

Mixed gas hydrate structures at the Chapopote Knoll, southern Gulf of Mexico

2010 ◽  
Vol 299 (1-2) ◽  
pp. 207-217 ◽  
Author(s):  
Stephan A. Klapp ◽  
M. Mangir Murshed ◽  
Thomas Pape ◽  
Helmut Klein ◽  
Gerhard Bohrmann ◽  
...  
Keyword(s):  
Gulf Of Mexico ◽  
Gas Hydrate ◽  
Mixed Gas ◽  
Southern Gulf Of Mexico

Dissociation behavior of pellet shaped mixed gas hydrate samples that contain propane as a guest

2006 ◽  
Vol 47 (15-16) ◽  
pp. 2491-2498 ◽  
Author(s):  
Taro Kawamura ◽  
Yasuhide Sakamoto ◽  
Michika Ohtake ◽  
Yoshitaka Yamamoto ◽  
Takeshi Komai ◽  
...  
Keyword(s):  
Gas Hydrate ◽  
Mixed Gas

scholarly journals Gas Hydrate Combustion in Five Method of Combustion Organization

Entropy ◽  
2020 ◽  
Vol 22 (7) ◽  
pp. 710
Author(s):  
Sergey Y. Misyura ◽  
Andrey Yu. Manakov ◽  
Galina S. Nyashina ◽  
Olga S. Gaidukova ◽  
Vladimir S. Morozov ◽  
...  
Keyword(s):  
Gas Hydrates ◽  
Gas Hydrate ◽  
Thick Layer ◽  
Combustion Products ◽  
Dissociation Rate ◽  
Powder Layer ◽  
Muffle Furnace ◽  
Mixed Gas ◽  
Harmful Emissions ◽  
Burning Coal

Experiments on the dissociation of a mixed gas hydrate in various combustion methods are performed. The simultaneous influence of two determining parameters (the powder layer thickness and the external air velocity) on the efficiency of dissociation is studied. It has been shown that for the mixed hydrate, the dissociation rate under induction heating is 10–15 times higher than during the burning of a thick layer of powder, when the combustion is realized above the layer surface. The minimum temperature required for the initiation of combustion for different combustion methods was studied. As the height of the sample layer increases, the rate of dissociation decreases. The emissions of NOx and CO for the composite hydrate are higher than for methane hydrate at the same temperature in a muffle furnace. A comparison of harmful emissions during the combustion of gas hydrates with various types of coal fuels is presented. NOx concentration as a result of the combustion of gas hydrates is tens of times lower than when burning coal fuels. Increasing the temperature in the muffle furnace reduces the concentration of combustion products of gas hydrates.

Thermodynamic Stability of H2+ Tetrahydrofuran Mixed Gas Hydrate in Nonstoichiometric Aqueous Solutions

2007 ◽  
Vol 52 (2) ◽  
pp. 517-520 ◽  
Author(s):  
Shunsuke Hashimoto ◽  
Takeshi Sugahara ◽  
Hiroshi Sato ◽  
Kazunari Ohgaki
Keyword(s):  
Aqueous Solutions ◽  
Thermodynamic Stability ◽  
Gas Hydrate ◽  
Mixed Gas

Dual-functional gas hydrate inhibition of tetramethylammonium chloride for carbon dioxide-methane mixed gas systems

Fuel ◽  
2021 ◽  
Vol 305 ◽  
pp. 121598
Author(s):  
Iqbal Ahmed Moujdin ◽  
Muhammad Saad Khan ◽  
Bhajan Lal ◽  
Hani Abdullah Abulkhair ◽  
Abdulmohsen Alsaiari
Keyword(s):  
Carbon Dioxide ◽  
Gas Hydrate ◽  
Mixed Gas ◽  
Dual Functional ◽  
Tetramethylammonium Chloride

scholarly journals Influence of Gas Supply Changes on the Formation Process of Complex Mixed Gas Hydrates

Molecules ◽  
2021 ◽  
Vol 26 (10) ◽  
pp. 3039
Author(s):  
Mengdi Pan ◽  
Judith M. Schicks
Keyword(s):  
Gas Hydrates ◽  
Gas Hydrate ◽  
Formation Process ◽  
Gas Flow ◽  
Hydrate Formation ◽  
Experimental Investigations ◽  
Gas Composition ◽  
Mixed Gas ◽  
Hydrate Phase ◽  
Gas Supply

Natural gas hydrate occurrences contain predominantly methane; however, there are increasing reports of complex mixed gas hydrates and coexisting hydrate phases. Changes in the feed gas composition due to the preferred incorporation of certain components into the hydrate phase and an inadequate gas supply is often assumed to be the cause of coexisting hydrate phases. This could also be the case for the gas hydrate system in Qilian Mountain permafrost (QMP), which is mainly controlled by pores and fractures with complex gas compositions. This study is dedicated to the experimental investigations on the formation process of mixed gas hydrates based on the reservoir conditions in QMP. Hydrates were synthesized from water and a gas mixture under different gas supply conditions to study the effects on the hydrate formation process. In situ Raman spectroscopic measurements and microscopic observations were applied to record changes in both gas and hydrate phase over the whole formation process. The results demonstrated the effects of gas flow on the composition of the resulting hydrate phase, indicating a competitive enclathration of guest molecules into the hydrate lattice depending on their properties. Another observation was that despite significant changes in the gas composition, no coexisting hydrate phases were formed.

Raman spectroscopic studies on methane+tetrafluoromethane mixed-gas hydrate system

2007 ◽  
Vol 251 (2) ◽  
pp. 145-148 ◽  
Author(s):  
Yuuki Kunita ◽  
Takashi Makino ◽  
Takeshi Sugahara ◽  
Kazunari Ohgaki
Keyword(s):  
Gas Hydrate ◽  
Spectroscopic Studies ◽  
Mixed Gas ◽  
Raman Spectroscopic

scholarly journals Phase Behavior for Pure and Mixed Gas Hydrate Systems.

2002 ◽  
Vol 12 (1) ◽  
pp. 34-39
Author(s):  
Takeshi SUGAHARA ◽  
Keisuke SUGAHARA ◽  
Kazunari OHGAKI
Keyword(s):  
Phase Behavior ◽  
Gas Hydrate ◽  
Mixed Gas

Structural phase transitions of methane+ethane mixed-gas hydrate induced by 1,1-dimethylcyclohexane

2011 ◽  
Vol 66 (12) ◽  
pp. 2672-2676 ◽  
Author(s):  
Yuuki Matsumoto ◽  
Hiroshi Miyauchi ◽  
Takashi Makino ◽  
Takeshi Sugahara ◽  
Kazunari Ohgaki
Keyword(s):  
Phase Transitions ◽  
Gas Hydrate ◽  
Structural Phase ◽  
Structural Phase Transitions ◽  
Mixed Gas
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