Asphaltene
Mostrando 13-24 de 25 artigos, teses e dissertações.
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13. Montagem e validação de unidade piloto para processo de desasfaltação em diferentes condições de operação / Assembly and experimental validadtion of deasphalting pilot plant at different operating conditions
A crescente demanda por óleos leves nas últimas décadas está forçando a indústria de petróleo a desenvolver processos novos e mais eficientes, além de adaptar e otimizar os existentes no processamento dos óleos crus pesados, extra-pesados e seus resíduos. A extração com diferentes solventes na região do supercrítico apresenta-se como alternativ
Publicado em: 2011
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14. Effect of the structure of commercial poly(ethylene oxide-b-propylene oxide) demulsifier bases on the demulsification of water-in-crude oil emulsions: elucidation of the demulsification mechanism
Water-in-crude oil emulsions are formed during petroleum production and asphaltenes play an important role in their stabilization. Demulsifiers are added to destabilize such emulsions,however the demulsification mechanism is not completely known. In this paper, the performances of commercial poly(ethylene oxide-b-propylene oxide) demulsifiers were studied us
Química Nova. Publicado em: 2010
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15. Development of a supercritical extraction pilot plant for upgrading of heavy oils and study of the asphaltene aggregation process / Desenvolvimento de uma planta piloto de desasfaltação supercritica para valoração de petroleos pesados e estudo do processo de agregação dos asfaltenos
Alphaltenes are complex aromatic macro-cycle molecules, with a molecular structure that varies depending on the origin of the crude oil. Apart from heir contribution to the properties of petroleum, the study of the asphaltic fraction asbecome more important, due to the problems encountered during petroleum Pro cessing caused by asphaltene precipitation, whic
Publicado em: 2009
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16. Simulação do processo de desasfaltação de petroleo pesado para obtenção de asfaltenos e oleo lubrificante / Simulation of a heavy oil deasphalting process to obtain asphaltenes and lube oil
Petroleum deasphalting is one of the major primary processes in crude oil refining. The study of deasphalting has gained considerable attention in the last few decades due to the increase in heavy crude oil reserves. In Brazil, the majority of the explored reserves produce heavy oils. The increasing reduction in the processing of light oils, added to the inc
Publicado em: 2009
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17. Polymer solution and lattice theory applications for modeling of asphaltene precipitation in petroleum mixtures
Here asphaltene precipitation in petroleum reservoirs during natural depletion and miscible gas injection is modeled via two distinct and new methods (polymer solution and lattice theories). The first model is based on the polymer solution theory, which is a combination of Miller's combinatorial term with a modified residual term of the original Flory-Huggin
Brazilian Journal of Chemical Engineering. Publicado em: 2008-09
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18. Caracterización y clasificación geoquímica de asfaltitas cubanas
Traditional biomarker parameters and aromatic compounds were applied to characterize and classify ten Cuban asphaltites (asphaltene-rich petroleum occurring as seeps or filling veins, joints, cavities and fissures). Genetic molecular parameters were compared in order to establish oil-oil correlations between samples. Thermal evolution was investigated using
Química Nova. Publicado em: 2008
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19. CaracterizaÃÃo de ligante asfÃltico brasileiro e avaliaÃÃo da presenÃa de hidrocarbonetos policÃclicos aromÃticos (HPAs) / Characterization of brazilian binder processed and evaluation of the presence of hydrocarbons polycyclic aromatics (HPAs)
The Brazilian binder processed at Petrobras/Lubnor from a crude of the state of EspÃrito Santo was investigated using the following procedures: spectrometric methods (RMN and FTIR), chromatographic (GPC), thermal analysis (TGA) and atomic microscopy (AFM). The two main fractions of the binder, maltenes and asphaltenes, were also analyzed. Hydrocarbons polyc
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/07/2007
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20. DETERMINING THE START OF PRECIPITATION ASPHALTENES IN BRAZILIAN CRUDE OIL AND THE IMPLICATIONS OF THE STABILITY IN CRUDE OILS MIXTURES / DETERMINAÇÃO DO INÍCIO DE PRECIPITAÇÃO DOS ASFALTENOS EM PETRÓLEOS BRASILEIROS E IMPLICAÇÕES NA ESTABILIDADE DE MISTURAS DE PETRÓLEOS
The crude oil can be understood as a mixture sufficiently polydisperse where its diverse components form a dispersion and/or solution whose original state can be modified in function of variations of temperature, pressure and composition causing, for example, the formation of organic deposits. The asphaltene constitutes heavy fractions of oils with great cap
Publicado em: 2006
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21. An experimental study of asphaltene particle sizes in n-heptane-toluene mixtures by light scattering
The particle size of asphaltene flocculates has been the subject of many recent studies because of its importance in the control of deposition in petroleum production and processing. We measured the size of asphaltene flocculates in toluene and toluene - n-heptane mixtures, using the light-scattering technique. The asphaltenes had been extracted from Brazili
Brazilian Journal of Chemical Engineering. Publicado em: 2004-12
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22. Espectroscopia de RPE no estudo da fotodegradação de asfaltenos em petróleo árabe e colombiano
It was investigated by Electron Paramagnetic Resonance Spectroscopy (EPR) at X band (~9GHz), the chemical nature and the interaction of free radicals in Arab, Colombian and Brazilian petroleum asphaltenes, under natural photodegradation conditions. The EPR spectra showed a single signal for organic free radicals. From this line were determined spectroscopic
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/02/2002
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23. Evaluation of Inoculum Addition To Stimulate In Situ Bioremediation of Oily-Sludge-Contaminated Soil
A full-scale study evaluating an inoculum addition to stimulate in situ bioremediation of oily-sludge-contaminated soil was conducted at an oil refinery where the indigenous population of hydrocarbon-degrading bacteria in the soil was very low (103 to 104 CFU/g of soil). A feasibility study was conducted prior to the full-scale bioremediation study. In this
American Society for Microbiology.
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24. Lignin Peroxidase Oxidation of Aromatic Compounds in Systems Containing Organic Solvents
Lignin peroxidase from Phanerochaete chrysosporium was used to study the oxidation of aromatic compounds, including polycyclic aromatic hydrocarbons and heterocyclic compounds, that are models of moieties of asphaltene molecules. The oxidations were done in systems containing water-miscible organic solvents, including methanol, isopropanol, N, N-dimethylform