Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 39 for “"Dimethyl-ether"”.
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Scaling down direct dimethyl ether synthesis for biogas conversion
The feasibility of direct DME synthesis from biogas conversion as a small scale energy storage system was studied. Anaerobic digestion (AD) of grass silage was used as a feedstock for production of biogas and it was found that grass silage has high affinity for methane enriched biogas. A …
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Development and assessment of renewable energy based integrated systems for dimethyl ether production
Dimethyl-ether (DME) is considered to be one of the most promising, renewable alternative fuels. This thesis studies, develops, analyzes and assesses the performance of three dimethyl-ether production integrated systems, where dimethyl-ether is produced from carbon dioxide and renewable hydrogen. …
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The adaptation of solenoid actuated injectors for use with dimethyl ether fuel in diesel engines
Dimethyl ether (DME) is an alternative fuel which, of late, has shown tremendous potential in reducing the pollution emissions of automobiles. Simultaneously, electronic actuated fuel injectors, with the use of solenoids, have repeatedly demonstrated superior performance with respect to needle …
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Experimental procedure development for measuring vapor-liquid equilibria in systems containing dimethyl ether tetraethylene glycol, R22 and R124
Includes bibliographical references (pages 76-77).
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Overall mass-transfer coefficients for a homologous series of poly glycol ethers between toluene and water
… The solutes used were ethylene glycol dimethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, and tetraethylene glycol dimethyl ether. The carrier solvent was water, and the extracting solvent was toluene. The phase diagrams for these systems were determined …
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Syntheses related to some naturally occurring naphthopyranquinones
… to (±)-isoeleutherin and (±)-deoxyquinone A dimethyl ether have been recorded, but they give rise to a mixture of eleutherin and isoeleutherin in the first case, and a mixture of deoxyquinone A dimethyl ether and its cisdimethyl isomer. The synthetic routes to isoeleutherin and deoxyquinone A …
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Feedstock-To-Tailpipe Analysis of Soybean-Derived Biodiesel and Glycerol Valorization in Kansas
… products such as soap, hydrogen, methanol, dimethyl ether (DME), and ammonia to economize biodiesel production and increase profitability. However, the conversion of glycerol into useful products requires material and energy inputs that carry a significant environmental footprint which must …
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Infrared Studies of Intramolecular Rovibrational Relaxation (Kinetics, Energy Transfer)
… filter wheel. Resolved fluorescence spectra from dimethyl ether and 1,4 dioxane indicate that the energy distribution within each molecule is dependent upon the CH stretch that is excited. The fluctuations in the relaxed mode energy content with excitation energy can be fit by a statistical model …
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Exergoeconomic analysis and optimization of organic Rankine cycles
… contract rates from the Ontario Power Authority. Dimethyl ether shows promising results with a system exergy efficiency of 11.76% and system energy efficiency of 2.84% at a source temperature of 120℃. The degree of superheat and pressure ratio are used as the independent variables in the …
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Routes to drimanes from podocarpic acid
… of a 12,13-dihydroxypodocarpatriene (37) and its dimethyl ether (38) have also been investigated. Routes for the conversion of the enone (45) and oxime (230), derived from the ozonolysis products of methyl podocarpate (10), to drimanes have also been investigated.
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The investigation of kairomones and photosensitizers affecting Liriomyza bryoniae (Diptera, Agromyzidae) /
… that the photosensitizer hematoporphyrin dimethyl ether obtained by L. bryoniae adults induces lethal effects in the insects exposed to the sunlight during 5 min. Also, the first attractant for tomato leafminer was determined which can be attributed to kairomones. This kairomone can be an …
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Investigation of polymers used in lithium oxygen batteries as electrolyte and cathode materials
… the gelled electrolyte with tetraethylene glycol dimethyl ether has been greatly increased than the liquid one. The as-prepared polymer electrolyte was demonstrated excellent cycling performances. This thesis also investigated the effect of different plasticizers on the performance of lithium …
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Synthesis of highly siliceous ZSM-5 using diaminoalkanes and their application for the conversion of methanol to light olefins
… ZSM-5 proceeds via dehydration to give firstly dimethyl ether and then light olefins. The olefins may subsequently undergo dehydrocyclisation to produce a mixture of light paraffins and aromatics, which are restricted to monocyclics and do not contain more than ten carbon atoms. As a result of …
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The synthesis and characterization of sodium polysulfides for Na-S battery application
… of sodium polysulfides in tetraethylene glycol dimethyl ether TEGDME were studied in this thesis. The solubility of Na2Sn in TEGDME increases with increasing sulfur in sodium polysulfide. The corresponding solution gets to longer-wavelength color and contains more long-chain polysulfides anions.
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Experimental Studies on Solvent Screening and Performance Analysis for Bitumen Recovery Using ES-SAGD
… investigation of four solvent candidates — Dimethyl Ether (DME), Natural Gas Condensate, Urea, and Pyrrolidine —to identify optimal concentrations that maximize recovery, minimize SOR, and reduce energy consumption. A series of ES-SAGD experiments was conducted using a fast-screening …
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A study of the toxicological properties of propolis samples from Europe and Saudi Arabia and of their biological activity against protozoa
… 7-Dimethoxykaempferol (12) and Naringenin 4', 7-dimethyl ether (13), and three compounds from a Saudi propolis sample: Hesperetin-7-methyl ether (14a), Sakuranetin (14b) and Lupeol (15). Both the crude extracts and isolated compounds displayed variable activity against the range of microorganisms …
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Simulation Study of Warm VAPEX Process Using Water-soluble Solvent
… In this study, the feasibility of injecting dimethyl ether (DME) to extract Athabasca bitumen is investigated through numerical simulations. A synthetic reservoir model with fine grids was developed to investigate the displacement mechanisms in a hot DME VAPEX process. Thermal dynamic …
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Multi-criteria lifecycle evaluation of transportation fuels derived from biomass gasification
… Gasoline) and Compression Ignition Engine fuels (Dimethyl Ether and Fischer-Tröpsch Diesel). The abovementioned fuels are analyzed on a lifecycle basis with respect to identified criteria affecting each fuels adoptability including: (1) energy efficiency, (2) cost of production and shipping, (3) …
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Analysis and Comparison of the Photodecomposition Reaction of Methanol on CeO2 Impregnated TiO2 Surfaces Versus Bare TiO2 Surfaces
… produce carbon dioxide, water, formaldehyde, dimethyl ether, and methanol in the presence of ultraviolet light and oxygen.</p>
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