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Dissertations / Theses on the topic 'Methane clathrate'

Author: Grafiati
Published: 4 June 2021
Last updated: 30 January 2023

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1

Townson, Iwan Meredydd. "Microbial inhibition of methane clathrate hydrates." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/41022.

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Two microbial species were tested for inhibition of methane hydrates in a stirred crystallizer (subcooling of 2.34 K). The ice associating Chryseobacterium sp. Strain C14, grown in 0.5 wt% Tryptic Soy Broth (TSB) delayed hydrate nucleation, on average, by 30.3 hours compared to 37.9 hours for the PVP solutions. Escherichia coli TG2 in 0.5 wt% TSB was used as a non ice associating bacteria control and surprisingly had the longest induction period of 118.1 hours, suggesting that it was 3 times more effective as a hydrate inhibitor than PVP. The 0.5 wt% aq. TSB solution without bacteria delayed h
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2

Gilmore, Rory Alan John. "Developing water and methane potentials for MD simulations of methane clathrate hydrate." Thesis, Queen Mary, University of London, 2018. http://qmro.qmul.ac.uk/xmlui/handle/123456789/41787.

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The aim of this thesis is to develop a set of intermolecular potentials that enable the study of nucleation or decomposition of methane hydrates. The potentials are developed for water, methane, and the water-methane pair by fitting to SAPT(DFT) reference energies. The first set of potentials developed differ from recent polarisable models in that they have rank 4 ISA multipoles, rank 3 anisotropic polarisabilities, rank 3 isotropic dispersion, and anisotropic exchange-repulsion terms. These potentials are validated based on the structures and energies of small clusters and second virial coeff
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3

Hughes, Thomas John. "Plug Formation and Dissociation of Mixed Gas Hydrates and Methane Semi-Clathrate Hydrate Stability." Thesis, University of Canterbury. Chemical and Process Engineering, 2008. http://hdl.handle.net/10092/1579.

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Gas hydrates are known to form plugs in pipelines. Hydrate plug dissociation times can be predicted using the CSMPlug program. At high methane mole fractions of a methane + ethane mixture the predictions agree with experiments for the relative dissociation times of structure I (sI) and structure II (sII) plugs. At intermediate methane mole fractions the predictions disagree with experiment. Enthalpies of dissociation were measured and predicted with the Clapeyron equation. The enthalpies of dissociation for the methane + ethane hydrates were found to vary significantly with pressure, the compo
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4

Susilo, Robin. "Methane storage and transport via structure H clathrate hydrate." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/703.

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This thesis examines the prospect of structure H (sH) hydrate to be exploited for methane storage. The methane content in the hydrate, hydrate kinetics and conversion rates are areas of particular importance. Experiments and theory are employed at the macroscopic and molecular levels to study the relevant phenomena. sH hydrate was successfully synthesized from ice particles with full conversion achieved within a day when thermal ramping above the ice melting point was applied. It was found that a polar guest (tert-butyl methyl ether / TBME) wets ice more extensively compared to two hydrophob
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5

Tonelli, Devin L. "Small Molecule Ice Recrystallization Inhibitors and Their Use in Methane Clathrate Inhibition." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/23994.

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Inhibiting the formation of ice is an essential process commercially, industrially, and medically. Compounds that work to stop the formation of ice have historically possessed drawbacks such as toxicity or prohibitively high active concentrations. One class of molecules, ice recrystallization inhibitors, work to reduce the damage caused by the combination of small ice crystals into larger ones. Recent advances made by the Ben lab have identified small molecule carbohydrate analogues that are highly active in the field of ice recrystallization and have potential in the cryopreservation of li
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6

Yoslim, Jeffry. "The effect of surfactant on the morphology of methane/propane clathrate hydrate crystals." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/3415.

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Considerable research has been done to improve hydrate formation rate. One of the ideas is to introduce mechanical mixing which later tend to complicate the design and operation of the hydrate formation processes. Another approach is to add surfactant (promoter) that will improve the hydrate formation rate and also its storage capacity to be closer to the maximum hydrate storage capacity. Surfactant is widely known as a substance that can lower the surface or interfacial tension of the water when it is dissolved in it. Surfactants are known to increase gas hydrate formation rate, increase stor
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7

Blackwell, Veronica R. "Formation processes of clathrate hydrates of carbon dioxide and methane." Thesis, 1998. https://thesis.library.caltech.edu/302/1/Blackwell_vr_1998.pdf.

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NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. This thesis explores the formation kinetics and mechanisms of clathrate hydrates of carbon dioxide and methane, focusing on the nucleation and early growth of hydrates. Homogenous and heterogeneous systems were studied. The catalysis of hydrate nucleation was accomplished by the addition of certain particles to the hydrate forming solution. Copper (II) oxide, calcium carbonate and some [...] and [...] aluminum oxide particles were found to be effective nucleators while a-iron o
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8

Yoslim, Jeffry, and Peter Englezos. "THE EFFECT OF SURFACTANT ON THE MORPHOLOGY OF METHANE/PROPANE CLATHRATE HYDRATE CRYSTALS." 2008. http://hdl.handle.net/2429/1028.

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In the present study the effect of one commercially available anionic surfactant on the formation/dissociation of hydrate from a gas mixture of 90.5 % methane – 9.5% propane mixture was investigated. Surfactants are known to increase gas hydrate formation rate. Memory water was used and the experiments were carried out at three different degrees of undercooling and two different surfactant concentrations. In addition, the effect of the surfactant on storage capacity of gas into hydrate was assessed. The morphology of the growing crystals and the gas consumption were observed during the e
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9

Srikanth, Ravipati. "Improved Theory of Clathrate Hydrates." Thesis, 2015. http://etd.iisc.ernet.in/2005/3913.

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The current theoretical understanding of thermodynamics of clathrate hydrates is based on the van der Waals and Plattew (vdWP) theory developed using statistical thermodynamics approach. vdWP theory has been widely used to predict the phase equilibrium of clathrate hydrates over the decades. However, earlier studies have shown that this success could be due to the presence of a large number of parameters. In this thesis, a systematic and a rigorous analysis of vdWP theory is per-formed with the help of Monte Carlo molecular simulations for methane hydrate. The analysis revealed that long rang
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10

Park, Youngjune, Minjun Cha, Woongchul Shin, Jong-Ho Cha, Huen Lee, and John A. Ripmeester. "THERMODYNAMIC AND SPECTROSCOPIC ANALYSIS OF TERTBUTYL ALCOHOL HYDRATE: APPLICATION FOR THE METHANE GAS STORAGE AND TRANSPORTATION." 2008. http://hdl.handle.net/2429/1106.

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Recently, clathrate hydrate has attracted much attention because of its energy gas enclathration phenomenon. Since energy gas such as methane, ethane, and hydrogen could be stored in solid hydrate form, clathrate hydrate research has been considerably focused on energy gas storage and transportation medium. Especially, methane hydrate, which is crystalline compound that are formed by physical interaction between water and relatively small sized guest molecules, can contain about as much as 180 volumes of gas at standard pressure and temperature condition. To utilize gas hydrate as energy
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11

Park, Youngjune, Minjun Cha, Jong-Ho Cha, et al. "SWAPPING CARBON DIOXIDE FOR COMPLEX GAS HYDRATE STRUCTURES." 2008. http://hdl.handle.net/2429/1153.

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Large amounts of CH4 in the form of solid hydrates are stored on continental margins and in permafrost regions. If these CH4 hydrates could be converted into CO2 hydrates, they would serve double duty as CH4 sources and CO2 storage sites. Herein, we report the swapping phenomena between global warming gas and various structures of natural gas hydrate including sI, sII, and sH through 13C solid-state nuclear magnetic resonance, and FT-Raman spectrometer. The present outcome of 85% CH4 recovery rate in sI CH4 hydrate achieved by the direct use of binary N2 + CO2 guests is quite surprising
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12

Klapproth, Alice. "Strukturuntersuchungen an Methan- und Kohlenstoffdioxid-Clathrat-Hydraten." Doctoral thesis, 2002. http://hdl.handle.net/11858/00-1735-0000-0006-B693-A.

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13

Klapproth, Alice [Verfasser]. "Strukturuntersuchungen an Methan- und Kohlenstoffdioxid-Clathrat-Hydraten / vorgelegt von Alice Klapproth." 2004. http://d-nb.info/971875693/34.

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14

Englezos, Peter, John A. Ripmeester, Saman Alavi, and Robin Susilo. "MOLECULAR DYNAMICS STUDY ON STRUCTURE-H HYDRATES." 2008. http://hdl.handle.net/2429/1024.

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The presence of structure H (sH) methane hydrate in natural environments, in addition to the well-known structure-I (sI) and II (sII) hydrates, has recently been documented. Methane in the presence of condensates (C5-C7) forms sH hydrate at lower pressure than the sI hydrate. Thus, the occurrence of sH methane hydrate is likely to have both beneficial and negative practical implications. On the negative side, in the presence of condensate, sH hydrate may form and plug gas transmission pipelines at lower pressures than sI hydrate. On the other hand, sH hydrate can be synthesized at lower
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15

Besnard, Guillaume. "Thermodynamics and kinetics studies of formation and decomposition of clathrates hydrates of methane, carbon dioxide and their mixtures using a differential heat flux calorimeter." Thesis, 1997. http://hdl.handle.net/1911/17065.

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A high pressure heat flux calorimeter in isobaric, temperature-ramping mode has been used to measure the solubility of pure methane, pure carbon dioxide and methane-carbon dioxide mixtures. The solubility measurements emphasize a crystallization-like process taking place during hydrate formation and show a striking divergence from Henry's Law, the frequently used calculation procedure, prior to and during hydrate formation. These measurements were further used to determine the enthalpies of solution/dissociation, and entropies change. Moreover, the hydration numbers of these compounds provide
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