Ethane
Mostrando 25-36 de 230 artigos, teses e dissertações.
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25. Caracterização microestrutural e eletroquímica de revestimentos ambientalmente amigáveis aplicados sobre a liga de Al 2024-T3. / Microestructural and electrochemical characterization of environmentally friendly coatings applied on Al alloy 2024-T3.
The increasing concern with sustainable development, allied with a stronger awareness with environmental preservation, has stimulated researches in order to find environmentally friendly substitutes to replace the efficient hexavalent chromium-based pre-treatment systems (Cr6+) used to protect high-strength aluminium alloys employed in the aircraft industry.
Publicado em: 2007
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26. AvaliaÃÃo dos processos de reforma dos componentes do gÃs natural com diÃxido de carbono
Empreenderam-se transformaÃÃes do etano e propano, componentes adicionais ao metano no gÃs natural, para gÃs de sÃntese via reforma seca com diÃxido de carbono na presenÃa do catalisador de Ni(3,92% em massa)/γ-Al2O3. As operaÃÃes dos processos foram realizadas em um micro reator de leito fixo, utilizando-se uma massa de catalisador de 0,080g,
Publicado em: 2007
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27. Adsorption of light alkanes on coconut nanoporous activated carbon
This paper presents experimental results for adsorption equilibrium of methane, ethane, and butane on nanoporous activated carbon obtained from coconut shells. The adsorption data were obtained gravimetrically at temperatures between 260 and 300K and pressures up to 1 bar. The Toth isotherm was used to correlate the data, showing good agreement with measured
Brazilian Journal of Chemical Engineering. Publicado em: 2006-12
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28. Uso do silano BTSE na proteção contra a corrosão de laminados de aço carbono. / The use of the silane bis-1,2-(triethoxysilyl) ethane (BTSE) in the protection against corrosion of rolled carbon steel (SCR).
Este trabalho apresenta os estudos das principais etapas que envolvem o uso do silano bis-trietoxisililetano (BTSE) na proteção contra a corrosão de laminados de aço carbono que são: o tratamento alcalino, a hidrólise do silano e a cura dos filmes obtidos. Através da técnica de análise espectroscópica na região do infravermelho foi possível obter
Publicado em: 2006
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29. Borohidreto complexos de cobre (I) contendo difosfinas: caracterização espectroscópica e comportamento térmico
Tetrahydroborate complexes of copper (I) with bidentate phosphines, [Cu(eta²-BH4)(dppm)] (1), [Cu(eta²-BH4)(dppe)] (2), [Cu(eta²-BH4)(cis-dppet)] (3) and [Cu(eta²-BH4)(dppb)] (4) (dppm = bis(diphenylphosphino)methane; dppe = 1,2-bis(diphenylphosphino) ethane; cis-dppet = 1,2-cis(diphenylphosphino)ethene; dppb = 1,4-bis(diphenylphosphino)butane) were prep
Química Nova. Publicado em: 2001-12
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30. Projeto de catalisadores para reações com gas de sintese
A partir do gás de síntese (que constitui uma mistura gasosa de óxidos de carbono e hidrogênio), pode-se obter hidrocarbonetos, álcoois e aldeídos. Estes podem ser obtidos também através da via petroquímica. Portanto, a produção desses compostos a partir do gás de síntese constituem vias alternativas que podem ser exploradas em função de aspec
Publicado em: 2001
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31. Solubility of carbon dioxide and ethane in lemon oil at elevated pressures
The solubility of ethane and carbon dioxide in lemon oil at elevated pressures has been measured using a variable volume cell, over temperature ranges of 298 - 308 K and 303 - 313 K, respectively, at pressures from 0.44 to 8.75 MPa. Partial liquid miscibility was not observed at any concentration measured. Molar densities of the saturated liquid mixtures are
Brazilian Journal of Chemical Engineering. Publicado em: 2000-12
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32. Calculation of mixture critical diagrams using an equation of state based on the lattice fluid theory
A modified form of the Hicks and Young algorithm was used with the Mattedi-Tavares-Castier lattice equation of state (MTC lattice EOS) to calculate critical points of binary mixtures that exhibit several types of critical behavior. Several qualitative aspects of the critical curves, such as maxima and minima in critical pressure, and minima in critical tempe
Brazilian Journal of Chemical Engineering. Publicado em: 2000-12
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33. Isolation and Identification of the Precursor of Ethane in Phaseolus vulgaris L 12
Ethane production by homogenates of Phaseolus vulgaris L. cv. Harvester was studied. The precursor of ethane was identified as linolenic acid. The liberation of ethane was optimum at pH 4.2 and was highest from homogenates of leaves and apical buds. When roots were homogenized in linolenic acid solution, ethane and ethylene production were stimulated. In cor
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34. Oxidation of ethane by an Acremonium species.
Ethane oxidation was studied in ethane-grown resting cells (mycelia) of an Acremonium sp. and in cell-free preparations of such mycelia. From resting cell experiments evidence was found for a pathway of ethane oxidation via ethanol, acetaldehyde, and acetic acid. In vitro studies indicated that ethane-oxidizing activity in such mycelia occurred predominantly
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35. Microbial Formation of Ethane in Anoxic Estuarine Sediments
Estuarine sediment slurries produced methane and traces of ethane when incubated under hydrogen. Formation of methane occurred over a broad temperature range with an optimum above 65°C. Ethane formation had a temperature optimum at 40°C. Formation of these two gases was inhibited by air, autoclaving, incubation at 4 and 80°C, and by the methanogenic inhib
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36. Ethylene and Ethane Production from Sulfur Dioxide-injured Plants 1
After alfalfa (Medicago sativa) seedlings were exposed to approximately 0.7 microliter per liter SO2 for 8 hours, elevated ethylene and ethane production was observed. Ethylene production peaked about 6 hours and returned to control levels by about 24 hours following the fumigation, while ethane production peaked about 36 hours and was still above control le