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|Language of final thesis:||Slovak|
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|Title of the thesis:||Physicochemical properties of alcohol-gasoline blends|
|Summary:||Increasing consumption of fuels demands for using renewable sources, which could partly replace the fuels based on fossil raw materials. Using bioethanol as a fuel brings several serious problems concerning transport and storage. Butanol-gasoline blends are not only the way of saving natural sources, but also the possible replacement for ethanol blends, while produced from the same sources. This master thesis presents the fuel characteristics of butanol/ethyl tert-butyl ether/gasoline blends compared to ethanol/ethyl tert-butyl ether/gasoline blends, following STN EN 228 standards. Chosen characteristics of the blends at various concentrations were determined: density at 15 °C, Reid vapor pressure, distillation characteristics, water content in two-phase system gasoline/water. Oxygen content was calculated. Butanol blends, compared to ethanol blends, slightly increased the density of the final blends, but still meeting the standards. Ethanol creates azeotropic mixtures with gasolines hydrocarbons at limited range and therefore, it increases vapor pressure. On the other hand, butanol in blend with ETBE lowers the Reid vapor pressure. A higher water contamination of ethanol/gasoline mixtures caused the phase separation, because ethanol transits to the water phase. This could lead to the decreasing of octane number and vapor pressure below the limit stated in technical norm. Butanol/gasoline blends show significantly better phase stability while contaminated with water, than ethanol/gasoline mixtures. Presence of butanol also lowers an oxygen content in the final blends, compared to ethanol/gasoline blends. From the point of view of the physicochemical characteristics of blends butanol/ETBE/gasoline, results of this research demonstrate, that butanol may be advantageous substitution for the currently used ethanol in gasoline mixtures, or it could be added in a mixture with ethanol.
|Key words:||ethanol, butanol, ETBE, gasoline, fuel, characteristics, blend|
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