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Dissertations / Theses on the topic 'Hydrates'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 July 2025

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1

Nour, Sherif. "17-O NMR on Crystalline Hydrades Hydrates: Impact of Hydrogen Bonding." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/32849.

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The water molecules in inorganic hydrate salts adopt different geometries and are involved in different hydrogen bond interactions. In this work, magic-angle spinning (MAS) and static 17O solid-state NMR experiments are performed to characterize the 17O electric field gradient (EFG) and chemical shift (CS) tensors of the water molecules in a series of inorganic salt hydrates which include: oxalic acid hydrate, barium chlorate hydrate, sodium perchlorate hydrate, lithium sulphate hydrate, and potassium oxalate hydrate, which were all enriched with 17O water. Data were acquired at magnetic fie
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2

Alfvén, Linda, and Sorin Ignea. "Characterization of Gas hydrates." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-203043.

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Gas hydrates are naturally occurring crystalline formations consisting of crystal structural “cages” which make up cavities where gas molecules can be trapped. Hydrates are formed under specific pressure and temperature conditions in the ground, which limits their presence to permafrost and deep sea continental margins. The interest for gas hydrates has grown bigger in the past time, mainly because of the potential as a new energy source but also because of the possibility of carbon dioxide (CO2) storage and its potential linkage to different geological hazards. Gas hydrates are still relative
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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

Sadeq, Dhifaf Jaafar. "Gas Hydrates Investigation: Flow Assurance for Gas Production and Effects on Hydrate-bearing Sediments." Thesis, Curtin University, 2018. http://hdl.handle.net/20.500.11937/75809.

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This thesis was aimed to study gas hydrates in terms of their equilibrium conditions in bulk and their effects on sedimentary rocks. The hydrate equilibrium measurements for different gas mixtures containing CH4, CO2 and N2 were determined experimentally using the PVT sapphire cell equipment. We imaged CO2 hydrate distribution in sandstone, and investigated the hydrate morphology and cluster characteristics via μCT. Moreover, the effect of hydrate formation on the P-wave velocities of sandstone was investigated experimentally.
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5

Rojas, González Yenny V. "Tetrahydrofuran and natural gas hydrates formation in the presence of various inhibitors." Thesis, Curtin University, 2011. http://hdl.handle.net/20.500.11937/2332.

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The aim of this thesis is to investigate the formation process of tetrahydrofuran (THF) hydrates and natural gas hydrates, and the effect of kinetic hydrate inhibitors (KHIs) on the formation and growth of these hydrates. Kinetic experiments were conducted in pressure cells in the presence of, or without, KHIs. Interfacial and electrokinetic techniques, including surface tension, Langmuir monolayers and zeta potential, were used to study the adsorption preferences of the inhibitors in two different interfaces, air–liquid and hydrate–liquid. For comparison purposes, selected thermodynamic hydra
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6

Le, Thi Xiu. "Experimental study on the mechanical properties and the microstructure of methane hydrate-bearing sandy sediments." Thesis, Paris Est, 2019. http://www.theses.fr/2019PESC1039.

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Les hydrates de méthane (MHs), composés de gaz de méthane et d’eau, se forment naturellement à haute pression et faible température dans les sédiments marins ou pergélisols. Ils sont actuellement considérés comme une ressource énergétique (principalement MHs dans les sédiments sableux) mais aussi une source de géo-hasards et du changement climatique (MHs dans les sédiments grossiers et fins). La connaissance de leurs propriétés mécaniques/physiques, qui changent considérablement avec la morphologie et distribution des hydrates dans les pores, est très importante pour minimiser les impacts envi
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7

Jang, Jaewon. "Gas production from hydrate-bearing sediments." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41145.

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Gas hydrates are crystalline compounds made of gas and water molecules. Methane hydrates are found in marine sediments and permafrost regions; extensive amounts of methane are trapped in the form of hydrates. The unique behavior of hydrate-bearing sediments requires the development of special research tools, including new numerical algorithms (tube- and pore-network models) and experimental devices (high pressure chambers and micromodels). Hydraulic conductivity decreases with increasing variance in pore size distribution; while spatial correlation in pore size reduces this trend, both variabi
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8

Zugic, Minjas. "Raman spectra of clathrate hydrates." Thesis, King's College London (University of London), 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271176.

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9

Barboux, Philippe. "Conductivite protonique dans les hydrates." Paris 6, 1987. http://www.theses.fr/1987PA066034.

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10

Barboux, Philippe. "Conductivité protonique dans les hydrates." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37602594d.

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11

Barros, Parigi Rafael. "Methane hydrates: Investigating the influence of sediment type on modeled methane escape in the high latitude Northern Hemisphere." Thesis, Stockholms universitet, Institutionen för geologiska vetenskaper, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-192841.

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Methane hydrates have drawn the attention of climate scientists in the past decades due to the potency of methane as a greenhouse gas and the widespread occurrence of hydrates both in terrestrial and marine environments, which, if destabilised, could enhance global warming. This study aims to investigate how much impact sediment type has on modeled methane escape at the feather edge of stability for methane hydrates in the high latitude Northern Hemisphere (45° to 75° N). This area is characterised by cool bottom-water temperatures leading to a shallow gas hydrate stability zone (GHSZ), and ha
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12

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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13

Wang, Qian. "Structure and Thermodynamic of Halogen Hydrates." Thesis, University of California, Irvine, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=1535376.

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<p> So far to our knowledge, the bromine-xenon double clathrate hydrate has not yet been completely studied. In recent research in Janda lab at UC Irvine, we obtained the thermodynamic properties and structure of bromine-xenon double clathrate by applying UV-Vis spectroscopy and determining the total vapor pressure of the clathrate. In both of the TS-I and CS-II structures, bromine could only stay in the bigger size cages, while introducing xenon as a helper gas to occupy the smaller cages. Based on this concept, we hypothesize that the bromine-xenon double clathrate has the TS-I structure typ
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14

Hardwick, Jack. "Simulating hydrates in shallow marine sediments." Thesis, Durham University, 2018. http://etheses.dur.ac.uk/12775/.

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With global energy needs growing alongside a drive to reduce carbon emissions, there is a demand for cleaner, alternative energy. Methane hydrates are one such resource that is being investigated with the goal of future potential exploitation. 99 % of this resource is found within marine environments where, particularly in shallow marine sediments, there is a concern that rising ocean temperatures may lead to widespread methane release as hydrate dissociates. Multi-component, multi-phase (MCMP) modelling can be used to forecast the behaviour of methane hydrate dissociation in these contexts. H
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15

Wilson, Craig W. "High-pressure studies of ammonia hydrates." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/8921.

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Ammonia and water are major components of many planetary bodies, from comets and icy moons such as Saturn's Titan to the interiors of the planets Neptune and Uranus. Under a range of high pressures and/or low temperatures known to occur in these planetary bodies, ammonia and water form a series of compounds known as ammonia hydrates. Ammonia and water form three stoichiometric compounds, ammonia hemihydrate, ammonia monohydrate and ammonia dihydrate, which have ammonia-to-water ratios of 2:1, 1:1 and 1:2 respectively. Therefore a good understanding of the three stable ammonia hydrates is requi
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16

Longo, Jean Paulo Nakatu. "Electrical impedance measurements of clathrate hydrates." Universidade Tecnológica Federal do Paraná, 2015. http://repositorio.utfpr.edu.br/jspui/handle/1/1406.

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PETROBRAS<br>Dentre os desafios no processo de produção de hidrocarbonetos na indústria de óleo e gás, uma área em destaque nos últimos anos é conhecida como garantia de escoamento, a qual envolve assegurar de forma contínua que os fluidos (óleo ou gás) escoem pelas tubulações que conectam o poço aos sistemas de separação na superfície. Um dos principais problemas enfrentados está ligado à deposição de hidratos de gás em tubulações, podendo estes diminuir o diâmetro útil ou até obstruir as tubulações, gerando perdas financeiras consideráveis devido a, principalmente, parada de produção. Hidrat
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17

Lavanant, Yves. "Etude du comportement mécanochimique des hydrates." Dijon, 1993. http://www.theses.fr/1993DIJOS062.

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A partir d'une recherche réalisée dans trois domaines: 1) la mise au point d'un dispositif original automatisé permettant de suivre en continu la déshydratation (ou la réhydratation) mécanique tout en maintenant constante la pression de vapeur d'eau dans l'enceinte de broyage; 2) la détermination des courbes p(t) caractéristiques de l'équilibre de déshydratation de plusieurs hydrates; 3) l'analyse comparée du comportement mécanochimique des hydrates d'une famille iso structurale et des fréquences de libration des molécules d'eau et leur structure, les résultats significatifs suivants ont été t
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18

BARRON, CECILE. "Destructuration d'amidons peu hydrates sous cisaillement." Nantes, 1999. http://www.theses.fr/1999NANT2091.

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La destructuration de l'amidon sous cisaillement, en milieu faiblement hydrate (25 - 30% b. H. ), a ete etudiee dans des conditions experimentales semblables a celles rencontrees en extrusion. Ce procede a ete simule a l'echelle du laboratoire par l'utilisation d'un rheometre a pre-cisaillement, le rheoplast. Pour des conditions de traitements thermomecaniques controlees (25<t<190\c, 0<<75s - 1, 15<t<30s), des etats intermediaires de transformations ont ete obtenus a partir d'amidons de diverses origines botaniques (pois lisse, mais cireux, ble et pois ride), et analyses a chaque echelle struc
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19

Kogon, Remi Albert Boris <1984&gt. "1H NMR Relaxation Characterization Of Hydrates." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amsdottorato.unibo.it/9773/1/1H%20NMR%20Relaxation%20Characterization%20of%20Hydrates.pdf.

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To distinguish the components of NMR signals from hydrated materials and to monitor their evolution after the addition of water to the powders, during the first two days of hydration. To implement the 3 Tau Model in a MATLAB script, called 3TM, provided with a Graphical User Interface (GUI), to easily use the 3 Tau Model with NMRD profiles. The 3 Tau Model, developed a few years ago is used for interpreting the dispersion (NMRD profiles, dependence on the Larmor frequency) of the longitudinal relaxation times, for liquids confined in porous media. This model describes the molecular dynamics
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20

De, Prunelé Alexis. "Dynamics of gas hydrate-bearing pockmarks : learnings from two cases studies from the Gulf of Guinea." Thesis, Brest, 2015. http://www.theses.fr/2015BRES0017/document.

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Cette étude doctorale a consisté à décrire la dynamique géochimique de deux pockmarks à hydrates de gaz de la marge africaine en considérant deux approches différentes. La première zone d’étude, appelée Preowei, est située au large du Nigéria. Elle est caractérisée par un grand nombre de pockmarks de tailles différentes, plus ou moins proche les uns des autres. Les analyses géochimiques des échantillons de fluides interstitiels, combinées aux données géophysiques (séismiques) ont permis de mieux comprendre le schéma de migration des hydrocarbures pour un ensemble composé de quatre pockmarks tr
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21

Ding, Tao. "Gas hydrates to capture and sequester CO₂." Master's thesis, Mississippi State : Mississippi State University, 2004. http://library.msstate.edu/etd/show.asp?etd=etd-11102004-141404.

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22

Beltrán, Roldán Juan Guillermo. "Equilibrium and morphology studies of clathrate hydrates." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66763.

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Phase equilibria and morphology of clathrates or gas hydrates were investigated. Four-phase equilibrium conditions (hydrate-liquidaq-liquid-vapor) and three-phase equilibrium conditions (hydrate-liquidaq-vapor) were determined for the systems methane + carbon dioxide + neohexane + water and methane + carbon dioxide + water, respectively. It was found that the equilibrium mole fraction of carbon dioxide in the vapor phase follows opposite trends in both systems, with respect to equilibrium pressure, at rather constant temperature. Structure H equilibrium occurred at lower pres
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23

Shafiei, Rami. "Thermal imaging of tetrahydrofuran hydrates heat spread." Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=95244.

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The research of gas hydrates has always been of industrial and scientific interests as their formation pose problems to the oil/gas industry while they also present a future energy resource as methane hydrates naturally occur in the earth crust. In the present study, Infrared imaging technology is utilized to observe and study heat spread of the formation and decomposition of tetrahydrofuran (THF) hydrates. Also, using infrared imaging technology, hydrates crystals are observed in the presence of poly(N-vinylpyrrolidone) (PVP) to study the crystals growth in presence of a kinetic inhibitor. TH
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24

Igboanusi, Udennaka Paul. "Properties and Production of Natural Gas Hydrates." Thesis, Imperial College London, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.519605.

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25

Nash, Karen. "Spectroscopic studies of atmospherically relevant acid hydrates." Thesis, University of York, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.326422.

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26

Russo, Manuela. "Titanium oxide hydrates : optical properties and applications." Thesis, Queen Mary, University of London, 2010. http://qmro.qmul.ac.uk/xmlui/handle/123456789/597.

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TiO2 has been extensively studied in the last decades due to its interesting optical and electronic properties, which, combined with low fabrication costs, renders this material very attractive for applications in photovoltaic and photocatalysis. However, the performances of titania in specific device applications were found to be strongly dependent on the synthetic methods selected for its production. The majority of such synthetic procedures rely on the hydrolysis of suitable precursors and often produce an amorphous solid, generally referred as the “amorphous” titanium oxide beside the crys
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27

Cao, Zhitao 1974. "Modeling of gas hydrates from first principles." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/8496.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 2002.<br>Includes bibliographical references.<br>Ab initio calculations were used to determine the H20-CH4 potential energy surface (PES) accurately for use in modeling gas hydrates. Electron correlation was found to be treated accurately by the second-order Moller-Plesset method (MP2). However, a large basis set, cc-pVQZ, was found to be necessary in order to compute the binding energies to within 0.1 kcal/mol of the basis set limit. In order to sample accurately the PES, the H2O-CH4 energy of interaction wa
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28

Roberts, Harrison R. "Re+: Changing the Way the World Hydrates." Thesis, The University of Arizona, 2010. http://hdl.handle.net/10150/146197.

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Public concerns regarding drinking water sources are amassing as unhealthy contaminants become more prevalent. In 2008, Congress dedicated a hearing to the dangers of bottled water. Dangers such as plastic bottles leaking antimony, causing pulmonary injuries and skin cancer. Additionally, 2.5 million plastic bottles are thrown away every hour. As a result, bottled water profits dropped 6% in the first quarter of 2009, and 24 colleges have banned plastic bottles on their campus. Re+ delivers purified water to consumers on-the-go through single serve water bottle refill kiosks; helping them save
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29

Dashti, Hossein. "Carbon dioxide capture using gas hydrates technology." Thesis, Curtin University, 2019. http://hdl.handle.net/20.500.11937/75679.

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Carbon dioxide (CO2) capture has been a significant topic of research and development activities over the past two decades. As a highly potential novel method, hydrate-based CO2 capture (HBCC) has received increasing attention within related industries, due to such advantages as the mild operating pressure and temperature that is required, the ease of regeneration and its unique separation mechanism. This thesis studied the kinetics modeling of gas hydrate formation for CO2 hydrates.
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30

Oignet, Jérémy. "Approche exergétique d'un procédé de réfrigération secondaire par coulis d'hydrates." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066590/document.

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L’utilisation des coulis d’hydrates comme Fluides Frigoporteurs Diphasiques (FFD) permet de réduire l’impact environnemental des systèmes frigorifiques car ces fluides possèdent une densité énergétique élevée. Leur application pour le stockage d’énergie thermique serait une réponse à une problématique industrielle de distribution de froid (climatisation, procédés de refroidissement). Un montage expérimental constitué d’une boucle de circulation et d’un réacteur de formation a été utilisé afin d’évaluer les caractéristiques thermo-hydrauliques des coulis d’hydrates de CO2 et a permis de détermi
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31

Myre, Denis. "Synthesis of Carbon Dioxide Hydrates in a Slurry Bubble Column." Thesis, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/19789.

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Carbon dioxide hydrates were synthesized in a 0.10m I.D. and 1.22m tall bubble column equipped with a cooling jacket for heat removal. Visual observations at different driving forces (pressures between 2.75 and 3.60 MPa and temperatures between 0 and 8ºC) were recorded with a digital camera through a sight glass of 118.8 by 15.6 mm. The superficial gas velocity was varied from 20 to 50 mm/s to attain different levels of turbulence in the liquid. The growth rate was found to be dependent on the sequence/method used to reach the operating temperature and pressure. A greater supersaturation was o
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32

Borchardt, Lars, Winfried Nickel, Mirian Casco, et al. "Illuminating solid gas storage in confined spaces – methane hydrate formation in porous model carbons." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-221847.

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Methane hydrate nucleation and growth in porous model carbon materials illuminates the way towards the design of an optimized solid-based methane storage technology. High-pressure methane adsorption studies on pre-humidified carbons with well-defined and uniform porosity show that methane hydrate formation in confined nanospace can take place at relatively low pressures, even below 3 MPa CH4, depending on the pore size and the adsorption temperature. The methane hydrate nucleation and growth is highly promoted at temperatures below the water freezing point, due to the lower activation energy i
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33

Martin, Ana Isabel. "Hydrate Bearing Sediments-Thermal Conductivity." Thesis, Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6844.

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The thermal properties of hydrate bearing sediments remain poorly studied, in part due to measurement difficulties inside the hydrate stability envelope. In particular, there is a dearth of experimental data on hydrate-bearing sediments, and most available measurements and models correspond to bulk gas hydrates. However, hydrates in nature largely occur in porous media, e.g. sand, silt and clay. The purpose of this research is to determine the thermal properties of hydrate-bearing sediments under laboratory conditions, for a wide range of soils from coarse-grained sand to fine-grained silica f
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34

Abbasi, Ghazanfer R. "Investigating the wettability effect on gas hydrate bearing sediments." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2023. https://ro.ecu.edu.au/theses/2650.

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Natural gas trapped in hydrate deposits is a potentially enormous source of energy which can in principle be extracted from the underground reservoir structures. These reserves can potentially also catastrophically release very large quantities of greenhouse gases to the atmosphere. Natural Gas Hydrate (NGH) occurs in sediments under certain pressure and temperature conditions and has the potential to meet the increasing global energy demand. However, an efficient exploitation of NGH requires a precise characterization and understanding of the hydrate formation, accumulation and dissociation m
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35

Rodriguez, Machine Carla Thais. "Raman spectroscopic study of CO2 capture and separation by semi-clathrate hydrates crystallization and investigation of exchange processes in hydrates." Electronic Thesis or Diss., Université de Lille (2018-2021), 2021. http://www.theses.fr/2021LILUR003.

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Aujourd’hui, les combustibles fossiles sont largement brûlés pour répondre aux besoins énergétiques croissants des populations humaines et aux enjeux industriels. De grandes quantités de gaz à effet de serre sont ainsi rejetées dans l’atmosphère et contribuent au réchauffement de la planète. Pour cette raison, des techniques d’atténuation du dioxyde de carbone (CO2) efficaces et respectueuses de l’environnement sont nécessaires, comme le captage et de stockage du carbone (CCS) en post-combustion, notamment à l’aide du processus de séparation à base d’hydrates (HBSP). Le HBSP consiste en l’enca
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36

Tabatabaei-Nejad, Seyyed Ali Reza. "Phase behaviour modelling of petroleum wax and hydrates." Thesis, Heriot-Watt University, 1999. http://hdl.handle.net/10399/593.

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37

Westacott, Robin E. "Direct free energy calculations applied to clathrate hydrates." Thesis, University of Reading, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283787.

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38

Martinez, de Baños Maria Lourdes. "Mechanisms of formation and dissociation of cyclopentane hydrates." Thesis, Pau, 2015. http://www.theses.fr/2015PAUU3037/document.

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Les mécanismes de formation et dissociation d’hydrates de cyclopentane (CP), qui forment á pression ambiante et á des températures entre 0ºC et 7ºC, ont été observés dans/sur/proche des gouttes d’eau immergées dans du CP á des échelles qui vont du micron jusqu’au millimètre. Plusieurs techniques d’observation ont été utilisées, telles que la macrophotographie et la microscopie optique en champ clair, par contraste interférentiel différentiel (CID), par fluorescence et par réflectance confocale. Des substrats hydrophiles et hydrophobes ont été utilisés. Dans une première série d’expériences, un
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39

Hamzaoui, Jamal El. "Recherche de l'origine du comportement mécanochimique des hydrates." Dijon, 1986. http://www.theses.fr/1986DIJOS040.

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On étudie la déshydratation mécanique de 27 sels hydrates au cours du broyage à différentes températures sous pression de vapeur d'eau contrôlée. La stabilité mécanique des sels est proportionnelle à l'énergie d'activation de leur décomposition thermique. Elle dépend, par ailleurs, de la nature chimique des hydrates.
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40

Choukroun, Mathieu. "Étude expérimentale et thermodynamique des hydrates sous pression." Nantes, 2007. http://www.theses.fr/2007NANT2086.

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D’intenses processus photochimiques empêchent la persistance du méthane atmosphérique de Titan sur des durées qui dépassent 100 millions d’années. La dissociation d’un réservoir interne de clathrates de méthane est un mécanisme de renouvellement probable. La présence d’ammoniac étant invoquée sur Titan, des expériences haute pression – basse température ont été réalisées dans les systèmes H2O-NH3, H2O-CH4, et H2O-NH3-CH4 pour apporter des contraintes sur ce processus. L’étude de la fusion des glaces dans les systèmes H2O-NH3 et H2O-NH3-CH4 a apporté de nouvelles données expérimentales, qui ont
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41

Picard, Vincent. "Etude du comportement thermique des oxalates hydrates d'yttrium." Dijon, 1993. http://www.theses.fr/1993DIJOS028.

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Les oxalates neutres Y#2(C#2O#4)#3, nH#2O (n=6 et 10) et l'oxalate acide YH(C#2O#4) 3H#2O sont les pr2curseurs de la synth7se de l'oxyde Y#2O#3. La d2shydratation sous pression de vapeur conduit à d'autres phases, dont la stœchiométrie en eau est égale a 3,5-3-2,5 et 2H#2O par mole de sel anhydre. Le dihydrate est egalement produit lors de la transformation du sel acide. Le trihydrate est la seule forme réellement stable dans les conditions ambiantes. La structure cristalline a été établie et comparée à celles du deca- et de l'hexahydrate. Cette comparaison révèle (I) la grande régularité de l
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Araújo, Ana Catarina Fernandes. "Molecular modeling of intermolecular interactions in acid hydrates." Master's thesis, Universidade de Aveiro, 2012. http://hdl.handle.net/10773/10947.

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Mestrado em Química<br>Esta dissertação explora o mundo nanoscópico de pequenos agregados onde as pontes de hidrogénio têm um papel preponderantes usando métodos quânticos ab-initio. No capítulo introdutório, a área da química computacional é apresentada e algumas noções teóricas referentes aos métodos ab-initio, discutidas. No Capítulo 2, o desempenho de vários níveis de teoria é avaliado através do estudo de pequenos agregados de água. O capítulo 3 discute a influência dos critérios de optimização no resultado deste processo, alertando para erros comuns. No Capítulo 4, hidratos gasosos de ác
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Ding, Luyi Carleton University Dissertation Chemistry. "Studies on structure and dynamics in clathrate hydrates." Ottawa, 1995.

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Hamzaoui, Jamal El. "Recherche de l'origine du comportement mécanochimique des hydrates." Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb37598189v.

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Franzyshen, Stephen Keith. "Acidic and Chemical Properties of Molten Salt Hydrates." W&M ScholarWorks, 1985. https://scholarworks.wm.edu/etd/1539625305.

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Friedman, Ross Aaron. "The dehydration of pharmaceutical hydrates under mechanical load." Diss., University of Iowa, 2014. https://ir.uiowa.edu/etd/3224.

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Nearly one-third of all pharmaceutical substances on the market are able to sorb water into their crystal lattices to form hydrates, which can often compromise stability during processing and/or storage[1]. The tendency of a hydrate to lose its water of crystallization during the manufacturing process of tablet compression is of particular concern to formulation scientists. The amount of water freed as a function of increasing compaction pressure can be explained by the mobility of water within the compact. The mobility of water is determined by the size and shape of the crystal lattice, the n
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English, Phillip Martin. "Structural studies of titanyl and zirconyl sulphate hydrates." Thesis, Curtin University, 2011. http://hdl.handle.net/20.500.11937/983.

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The aim of this thesis was to use a combination of computer simulations and experimental methods to gain insight into the unknown structure of the material titanyl sulphate dihydrate, TiOSO4*2H2O.Samples of TiOSO4*2H2O, along with TiOSO4*H2O, were produced and analysed using X-ray and neutron diffraction at both laboratory and synchrotron facilities. Both ex-situ and in-situ experiments were performed in order to analyse both the structure and growth of the crystals. The diffraction data resulting from these experiments was then used in various structure determination programs. A unit cell was
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Wang, Shuo. "Investigation of inhibition performance of kinetic hydrates inhibitors." Thesis, Curtin University, 2012. http://hdl.handle.net/20.500.11937/2241.

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The aim of this thesis is to investigate the inhibition process of tetrahydrofuran (THF) hydrates in presence of two kinetic hydrate inhibitors (KHIs), poly(N-vinylcaprolactam) and poly(vinylcaprolactam /vinylpyrrolidone/ dimethylaminoethyl methacrylate), and the effect of these KHIs on the formation and growth of THF hydrates at various experimental conditions, using a ball-stop rig and a rheometer. Other chemicals, including ethanol, ethylene glycol, and sodium chloride salt were used to investigate their synergic effect to the KHIs.
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Smith, Callum Conway. "Analysis of Natural Gas Hydrates using Inert Gases." Thesis, Curtin University, 2017. http://hdl.handle.net/20.500.11937/57085.

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This research focuses on the analysis of natural gas hydrates with the use of inert gases. Phase equilibria for several natural gas and methane-containing gas mixtures are analysed and used in the understanding of the influence each non-methane component instils towards the thermodynamic conditions for hydrate equilibria. Correlations and new thermodynamic data, namely dissociation enthalpies, are presented. These values are also used to compare the stability of structure I to structure II hydrates and establish a composition range where a transition occurs.
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Jung, Jongwon. "Gas production from hydrate-bearing sediments:geo-mechanical implications." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/42841.

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Gas hydrate consists of guest gas molecules encaged in water molecules. Methane is the most common guest molecule in natural hydrates. Methane hydrate forms under high fluid pressure and low temperature and is found in marine sediments or in permafrost region. Methane hydrate can be an energy resource (world reserves are estimated in 20,000 trillion m3 of CH4), contribute to global warming, or cause seafloor instability. Research documented in this thesis starts with an investigation of hydrate formation and growth in the pores, and the assessment of formation rate, tensile/adhesive strength a
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