Global ETD Search
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Showing 1 to 18 of 18 for “"methyl tert-butyl ether"”.
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Experiment, thermodynamic properties and modeling on combustion of methyl tert-butyl ether : isobutane and isobutene and thermodynamic properties of chloro alkanes and alkenes
The reaction systems: methyl tert-butyl ether (MTBE) unimolecular decomposition, MTBE radicals + O_2, tert-butyl radical +O_2, isobutene + HOO. (HO_2),isobutene + OH, sobutene-OH adducts + O_2, and allylic isobutenyl radical + O_2, are important systems in the understanding the oxidation chemistry …
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Shock Tube and Mid-IR Laser Absorption Study of Combustion Kinetics
… the alternative fuels studied are furans (2-methyl furan and 2-methyl tetrahydrofuran), alcohols (propanol isomers), and other relevant oxygenated fuels (methyl tert-butyl ether, methyl propanoate). The fossil fuel components are 1,3-dimethylcyclohexane and methane. Methane and methyl …
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Analysis of disinfection by products in drinking water by solid phase extraction
… Extraction Disks, and desorbed the analytes with methyl-tert-butyl ether (MTBE) as a solvent. The results showed that with the SPE method the recoveries were low (0-50%) for most compounds, and the limit of detection (LOD) values were in the range of 0.2 to 50 ug/L, which were much higher than …
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Thermochemical Study of Crystalline Solutes Dissolved in Ternary Hydrogen-Bonding Solvent Mixtures
… solvent systems were studied containing an ether (Methyl tert-butyl ether, Dibutyl ether, or 1,4-Dioxane), an alcohol (1-Propanol, 2-Propanol, 1-Butanol, 2-Butanol, or 2-Methyl-1-propanol), and an alkane (Cyclohexane, Heptane, or 2,2,4-Trimethylpentane) cosolvents. The Combined NIBS (Nearly …
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Anaerobic biodegradation of selected organic compounds with and without inhibition of sulfate reducing bacteria
… in the anaerobic biodegradation of methanol, methyl tert-butyl ether (MTBE), toluene, phenol, and 2,4- dichlorophenol. In addition, biodegradation rates of these compounds at various initial concentrations with and without inhibition of sulfate reducing bacteria were determined along with …
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Developing and Understanding Iridium-Catalysed Arene Borylation
… The key to this transformation is the use of methyl tert-butyl ether (MTBE). This procedure allows efficient synthesis of biaryls by initial C-H borylation of aromatic substrates followed by addition of water, subsequent reagents and aryl halide to complete the Suzuki-Miyaura cross-coupling …
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Biodegradation of tert-butyl alcohol (TBA) using biological granular activated carbon (bio-GAC)
ABSTRACT Tert-butyl alcohol (TBA), a metabolite of the gasoline additive methyl tert-butyl ether (MTBE), is a common groundwater contaminant encountered at petroleum remediation sites. This work explored the capability of YZ2, a novel pure culture, to completely degrade TBA aerobically in both …
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Exposure to hazardous air pollutants in homes
… (p-DCB), ethylbenzene, formaldehyde, methylene chloride, methyl tert-butyl ether (MTBE), styrene, trichloroethylene and tetrachloroethylene. Results indicate that Hispanics and non-Hispanic whites had median cumulative cancer risks (CCR) of 520×10-6 and 440×10-6, respectively, for …
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A GIS-Based Comparative Study of Superfund Contaminants and the Threat They Represent to Eastern Harris County Communities
… (HAP), all of which contain benzene, metals, Methyl Tert-Butyl Ether, and Volatile Organic Compounds above the Maximum Contaminants Level (MCL) and lie in close proximity to Channelview, Highlands, and Crosby. Three sites to the south of the 1-10 overpass include the San Jacinto River Waste …
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Sorption of pentachlorophenol to humic acids and subsequent effects on biodegradation and solvent extraction
… acids prevented the extraction of the sorbate by methyl-tert-butyl ether and methylene chloride. Recovery of the pentachlorophenol sorbed to the dissolved humic acids ranged from zero to 42.9 percent, depending on the solution pH. The removal of pentachlorophenol from the particulate matter varied …
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Anticipation nationwide risks to drinking water : predicting local scale contamination of community supply wells by gasoline additives
Only ten years after the increased addition of methyl-tert-butyl-ether (MTBE) to U.S. gasolines, nationwide MTBE contamination of thousands of drinking water supply wells has been widely documented, reflecting enormous environmental and economic costs. Due to its abundance in gasoline, high aqueous …
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Extraction of alcohols from gasoline using solid phase microextraction (SPME)
It is common practice to add oxygenates, such as ethers or alcohols, to gasoline in areas suffering from ozone or smog problems in order to reduce pollution. The most commonly used oxygenates are ethanol (EtOH) and methyl tert-butyl ether (MTBE). However, MTBE is now forbidden by the environmental …
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Evaluation of biomass from the halotolerant microalga Dunaliella salina as an animal feed additive with immune-modulatory activity
… had been prepared from defatted material using methyl-tert-butyl-ether and methanol. Galactolipids which may have bioactivity, were also detected. Antibacterial effects were not observed, although these cannot yet be ruled out.
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The effects of Fe(III) reduction on biodegradation of fuel oxygenates and chlorinated ethenes
Fuel oxygenates, methyl tert-butyl ether (MTBE) and tert-butyl alcohol (TBA), and chlorinated ethenes (TCE, cis-DCE and VC) are two groups of contaminants prevalent in groundwater systems. Fe(III) reducing conditions are dominant in many sedimentary environments. However, the effects of Fe(III) …
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The Effect of Natural Organic Matter on UV/H<sub>2</sub>O<sub>2</sub> Treatment and the Effect of UV/H<sub>2</sub>O<sub>2</sub> Treatment on Natural Organic Matter
… destruction of atrazine, metolachlor, methyl tert-butyl ether (MTBE), methylisoborneol, ibuprofen, gemfibrozil, and 17α-ethynylestradiol was evaluated. UV absorbance scans demonstrated changes in NOM from UV/H<sub>2</sub>O<sub>2</sub> that increased under certain NOM conditions. As NOM …
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Hydrothermal chemistry of methylene chloride and MTBE : experimental kinetics and reaction pathways
… and associated rates is essential. The rates of methylene chloride and methyl tert-butyl ether (MTBE) hydrolysis in sub- and supercritical water have been measured experimentally at 250 bar over a range of temperatures from 100 to 600°C. The rate constants for both compounds showed a local …
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Understanding the molecular-level chemistry of H2O plasmas and the effects of surface modification and deposition on a selection of oxide substrates
… concentrations of either methanol (MeOH) or methyl tert-butyl ether (MTBE) were used to follow breakdown mechanisms. Emission from CO* was used to monitor the contaminant and for molecular breakdown confirmation through actinometric OES as it can only arise from the carbon-based contaminant …
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In-situ photocatalytic remediation of organic contaminants in groundwater
… of organic compounds. The target contaminant is methyl tert butyl ether (MTBE), a popular gasoline additive in the past three decades, which gives the water an unpleasant taste and odour at 20 µg L-1, making it undrinkable. This research consists of three major parts, i.e. (i) establishing a …