Gasolines
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. 1H NMR and Chemometric Methods to Estimate the Octane Number in Brazilian C Gasolines
Brazilian gasoline type C can be purchased with octane number as the main difference. This quality parameter directly affects the price. Intermediate formulations may not be easily distinguished from conform samples due to similarity in visual appearance and physicochemical properties. The use of anhydrous ethanol as an additive also influences the octane va
J. Braz. Chem. Soc.. Publicado em: 2020-08
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2. Obtenção do 2-etóxi-2-metilpropano grau analítico a partir do produto comercial
Ethyl tert-butyl ether (ETBE) is produced by commercial processes to a purity of up to 96%. In recent years, several companies have started to produce ETBE, increasing the demand for standards with higher grades of purity in the area of production control and final product certification. The present work involved the development of a purification protocol fo
Química Nova. Publicado em: 2010
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3. Rendimento térmico e emissões de contaminantes atmosféricos de gasolinas formuladas com etanol, MBTE e TAEE
The specific consumption and carbon monoxide (CO) and nitrogen oxide (NO) emissions from gasolines formulated with ethanol, methyl tert-butyl ether (MTBE) and tert-amyl ethyl ether (TAEE) were evaluated in the rich, stoichiometric and lean-burn regions during the operation of an Otto-cycle engine. The use of ethanol as an additive presented high specific con
Química Nova. Publicado em: 2008
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4. Desenvolvimento de um equipamento para avaliação do efeito do etanol na pressão de vapor e entalpia de vaporização em gasolinas automotivas
The quality of the gasoline utilized for fueling internal combustion engines with spark ignition is directly affected by the gasoline's properties. Thus, the fuel's properties must be in perfect equilibrium to allow the engine to perform optimally, not only insofar as fuel consumption is concerned, but also in order to reduce the emission of pollutants. Vapo
Química Nova. Publicado em: 2006-06
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5. Predição de propriedades de gasolinas a partir das suas composições. / Prediction of gasoline properties from composition data
As gasolinas comerciais são normalmente produzidas a partir de combinações de frações oriundas da destilação do petróleo ou de outros processos petroquímicos e de refino e realizadas de modo a atender uma variedade de especificações legais e ambientais, com o mínimo de custo possível. A qualidade para o uso e comercialização de uma gasolina é
Publicado em: 2006
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6. MediÃÃo experimental e prediÃÃo da volatilidade de flex fuels
Oxygenated additives are added to gasoline to increase its antiknock properties. These compounds are substitutes for additives that are environmentally more aggressive, like tetraethyl lead. The oxygenated used in the Brazilian gasoline is the anhydrous ethanol 20% the 25%, which can affect the fuel properties strongly. In the last decade, the number of vehi
Publicado em: 2005
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7. CARACTEREZITION OF GASOLINES BY FT-RAMAN SPECTROSCOPY / CARACTERIZAÇÃO DE GASOLINAS POR ESPECTROSCOPIA FT- RAMAN
The aim of this work was to determine the contents of the more important components and physical properties of commercial gasolines and synthetic mixtures with known composition, prepared in the laboratory. The Raman spectra of 60 gasolines and 52 mixtures were acquired with a Nicolet 950 Fourier Transform Raman (FT-Raman) spectrometer. The raw spectra were
Publicado em: 2003
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8. Relationship of apparent and actual thickness of free phase gasoline and E-20 in column experiment / "Relação entre a espessura real e aparente da gasolina com etanol e da gasolina pura em colunas de laboratório"
Commercial gasolines sold in Brazil are added ethanol from 20 to 24% by volume. This oxygenated additive raises the octane level and reduces carbon monoxide emissions to the atmosphere. Underground storage tanks and gasoline lines are a major potential problem for soil and groundwater contamination. Since ethanol has cosolvent properties that alter the behav
Publicado em: 2003