Heavy Petroleum Fractions
Mostrando 1-12 de 17 artigos, teses e dissertações.
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1. The Stabilization of Asphaltenes in Different Crude Fractions: A Molecular Approach
The conditions of petroleum extraction may allow asphaltenes to precipitate, causing deposition that clogs wells, pipes and equipment, consequently reducing productivity. In this work, the solubility parameters and precipitation onset of polar fractions of heavy crudes from Brazilian fields were estimated using a simplified system of n-heptane/toluene mixtur
J. Braz. Chem. Soc.. Publicado em: 2021-04
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2. AVALIAÇÃO DE ASFALTENOS PRECIPITADOS EM DIFERENTES CONDIÇÕES DE COMPOSIÇÃO, TEMPERATURA E PRESSÃO
Asphaltenes are a heavy fraction of petroleum with the ability for self-association, a phenomenon that can occur spontaneously in the reservoirs or in any of the various stages of production and processing, depending on variations in pressure, temperature, composition and shearing, among others. In this work, it was evaluated the precipitation of asphaltenes
Quím. Nova. Publicado em: 2018-02
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3. Avaliação de tecnologia para redução da viscosidade de resíduos pesados de petróleo utilizando laser / Assessing technology for reducing the viscosity of heavy petroleum residues using laser
The use of infrared radiation produced by a CO2 laser in visbreaking of heavy fractions of petroleum was assessed. The main criterion used to evaluate the technology was to compare the viscosities of atmospheric distillation residues before and after being irradiated under different operating conditions of the laser. A suitable profile for comparison was dev
Publicado em: 2011
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4. Utilização de prototipo nacional de destilador molecular para caracterização de frações pesadas de petroleo / Use of national molecular distiller prototype for characterization of heavy oil fractions
The characterization through TBP (True Boiling Point) curve is one of the most common experimental techniques for determination of petroleum properties. This curve defines the yield of petroleum products as function of their true boiling points, supplying important information on decisions of refinery process control and on the quality of the produced oil. D
Publicado em: 2009
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5. 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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6. Development of a computaciona model for thermal cracking processes / Desenvolvimento de modelo computacional para craqueamento termico
The mathematical modeling and the computational simulation of a process furnace for thermal conversion of heavy oil fractions is developed in this work. Kinetics of conversion reactions is from Sugaya (1993). It is based in a first order irreversible reaction with 9 lumps and 24 pseudocomponents. The 24 pseudocomponents are characterized and their properties
Publicado em: 2008
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7. Caracterização das correntes do processo de destilação molecular aplicado a frações pesadas de petroleo e desenvolvimento de correlações da curva PEV / Characterization of molecular distillation process applied to petroleum heavy factions and development of TBP curve correlation
O etanol perdido por evaporacao durante o processo de producao por fermentação pode ser recuperado por uma coluna de absorcao, a qual requer um sistema de controle robusto de acordo com sua complexidade. Este equipamento tambem e utilizado no tratamento do CO2, um co-produto deste processo. Neste sentido, no presente trabalho foi proposto e testado, o empr
Publicado em: 2008
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8. Simulação, analise e otimização das colunas atmosferica e debutanizadora da unidade de destilação do refino de petroleo / Simulation, analysis and optimization of the atmospheric and debutanizer columns of the petroleum distillation unit
The crude distillation unit is the most important in the refining process. Its importance is due to the fact that this unit is responsible for the first fractionation of the petroleum in various products (fractions) as naphtha, kerosene, diesel and others. Some of these fractions obtained are removed as final product and others can be processed in other unit
Publicado em: 2007
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9. Obtenção de Propriedades Físico-Químicas de Misturas de Hidrocarbonetos em Baixa e Alta Pressão Visando a Caracterização e a Modelagem
The composition of petroleum may change from well to well and its resulting characteristics influence significantly the refine products. Therefore, it is important to characterize the oil in order to know its properties and send it adequately for processing. Since petroleum is a multicomponent mixture, the use of synthetic mixtures that are representative of
Publicado em: 2007
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10. Caracterização de frações ultra pesadas de petroleo nacional por meio do processo de destilação molecular / Characterization of petroleum heavy fractions through molecular distillation process
No Brasil, grandes reservas de petróleo encontradas são de óleos pesados. As altas viscosidades destes óleos dificultam a exploração, escoamento, transferência, processamento primário e refino. Se por um lado, a realidade brasileira de óleos pesados é grande, por outro, a necessidade por produtos mais leves na indústria petrolífera vem aumentando
Publicado em: 2007
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11. 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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12. Extension of the true boiling point curve for national heavy petroleums through nolecular distillation process / Extensão da curva de ponto de ebulição verdadeiro para petroleos pesados nacionais atraves do processo de destilação molecular
Molecular Distillation is a separation process which explores high vacuum, operation at reduced temperatures and brief exposition of the material to the operating temperature. The term vacuum residue (heavy petroleum fractions) refers to the bottom of the vacuum distillation, which has an atmospheric equivalent temperature (AET) above 540°C. The determinati
Publicado em: 2005