Naphthenic Acids
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Characterization of Acidic Compounds in Brazilian Tar Sand Bitumens by LTQ Orbitrap XL: Assessing Biodegradation Using Petroleomics
A set of eight tar sand samples with identical source, from sedimentary facies of the Pirambóia Formation, Paraná Basin, provides an interesting opportunity to assess the biodegradation extent of bitumens using high-resolution mass spectrometry with Orbitrap mass analyzer. The results suggest that acidic compounds have been degraded by microorganisms, sinc
J. Braz. Chem. Soc.. Publicado em: 2017-05
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2. CERIUM INCORPORATED INTO A MESOPOROUS MOLECULAR SIEVE (MCM-41)
Abstract The synthesis and characterization of a mesoporous molecular sieve (MCM-41) was studied due to its high surface area and large pore volume and to target potential applications in adsorption and catalysis. Rare earth elements have special chemical properties and are efficient promoters for supports. In this study, a mesoporous molecular sieve that in
Braz. J. Chem. Eng.. Publicado em: 2016-09
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3. Ácidos naftênicos no petróleo
Brazilian petroleum is known by its high acidity due to the presence of acidic constituents, especially naphthenic acids (NA). The total characterization of the NA in petrochemical samples has been receiving special attention in research and comprises an analytical challenge, mainly due to the complexity of their mixtures. Gas chromatography with mass detect
Química Nova. Publicado em: 2012
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4. RemoÃÃo de Ãcidos naftÃnicos presentes na mistura modelo de querosene de aviaÃÃo utilizando adsorventes tipo perovsquitas modificadas
In this work were prepared adsorbents of type perovsquitas La1-xMgxNiO3, where x = 0, 0.25, 0.5, 0.75, 1.0. The addition of magnesium resulted in increased basicity of the material and consequently the affinity of the acids. The adsorbents prepared materials were characterized by atomic absorption espectrofometria (AA), X-ray diffraction (XRD) measurement of
Publicado em: 2009
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5. Estudo de adsorção de ácidos naftênicos a partir de correntes de hidrocarbonetos / Study of adsorption of naphthenic acids from hydrocarbon stream
Ácidos naftênicos correspondem à complexa mistura de ácidos carboxílicos presentes no petróleo, responsáveis diretamente pela sua acidez e pela sua corrosividade em fase líquida durante o refino. Tais compostos também estão presentes nas frações destiladas do petróleo, causando diversos problemas na qualidade final do produto. Uma possível form
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 04/05/2007
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6. Characterization of commercial ceramic adsorbents and its application on naphthenic acids removal of petroleum distillates
The mixture of carboxylic acids present in petroleum oil and directly responsible for its acidity and corrosiveness in liquid phase during the refine process is denominated "naphthenic acids". These acids are also present in distilled fraction of petroleum, causing several problems in final products quality. A possible way to remove the carboxilic acids from
Materials Research. Publicado em: 2007-06
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7. Estudo da fração acida do querosene de aviação (QAV) e sintese de padrões sesquiterpenicos e acidos carboxilicos para analise em CG-EM
Little attention has been devoted to the composition of the acidic fractions of the Brazilian petroleum. On the other hand, during the course of our previous studies, we observed the occurence of a considerable concentration of naphthenic acids in Cabiunas crude oil. The above facts have motivated our group to start a research line on the study of the acidic
Publicado em: 1990
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8. Common Components of Industrial Metal-Working Fluids as Sources of Carbon for Bacterial Growth
Water-based metal-working fluids used in large-scale industrial operations consist of many components, but in the most commonly used formulations only three classes of components are present in high enough concentrations that they could, in principle, provide enough carbon to support the high bacterial densities (109 CFU/ml) often observed in contaminated fa
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9. Structure of Some Cyclohexyl Compounds as Related to Their Ability to Stimulate Plant Growth 1
Aqueous solution, 10 mm, of cyclohexanecarboxylic, cyclohexylacetic, cyclohexylpropionic, cyclohexylbutyric acids (all components of naphthenic acid); cis-1,2-, and trans-1, 4-cyclohexyldicarboxylic acids; 3-cyclohexene-1-carboxylic and cyclohexylsulfamic acids; and cyclohexyl mercaptan were applied to 14-day-old bush bean plants, Phaseolus vulgaris L. cv. T
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10. Mechanism of Plant Growth Stimulation by Naphthenic Acid: Effects on Nitrogen Metabolism of Phaseolus Vulgaris L. 1
Fourteen-day-old Phaseolus vulgaris L. cv. Top Crop (bush bean) plants were sprayed with the plant growth stimulant, potassium naphthenate (20 mm). Seven days after treatment the contents of glutamic acid dehydrogenase, glutamic-oxaloacetic transaminase, nitrate reductase, glutamine synthetase, and cytochrome oxidase in the trifoliate leaf blades of treated