Asphaltene
Mostrando 1-12 de 25 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. THERMODYNAMIC ANALYSIS AND MODELING OF BRAZILIAN CRUDE OIL AND ASPHALTENE SYSTEMS: AN EXPERIMENTAL MEASUREMENT AND A PC-SAFT APPLICATION
ABSTRACT Asphaltenes represent the heaviest fraction of crude oils, being recognized by their tendency to self-associate and precipitate. Asphaltene precipitation and subsequent deposition can cause problems in all stages of production. The objective of this paper is to model Brazilian crude oil and asphaltene systems using the PC-SAFT equation of state. Asp
Braz. J. Chem. Eng.. Publicado em: 15/07/2019
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3. Synthesis and characterization of asphalt composite precursors using amorphous rice husk silica
Resumo Nesta pesquisa, compósitos asfálticos foram produzidos misturando asfalto com sílica extraída da casca de arroz, com relação asfalto:sílica de 1:0, 1:1,7 e 1:2, e calcinados a 150 ºC. O desenvolvimento das estruturas foi caracterizado por espectroscopia no infravermelho com transformada de Fourier (FTIR), difração de raios X (XRD), microscop
Cerâmica. Publicado em: 06/06/2019
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4. Model Molecules for Evaluating Asphaltene Precipitation Onset of Crude Oils
Predicting the compatibility of crude oils from different streams can be done by applying models that use the solubility parameter of the oils. The approximate solubility parameter value of a given crude oil can be calculated by observing the asphaltene precipitation onset caused by titration with n-heptane. For oils whose precipitation onset is not well def
J. Braz. Chem. Soc.. Publicado em: 23/05/2019
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5. Optimization of Atmospheric Pressure Photoionization for the Crude Oil Analysis Using Ultra-High Resolution Mass Spectrometry
Design of experiments (DOE) applied to mass spectrometry (MS), mainly focusing on the optimization of ionization techniques, has been applied to optimize experiments in order to provide the highest amount of information with the lowest number of experiments. However, DOE has not been used in petroleomics. For the first time, we applied DOE to optimize the ma
J. Braz. Chem. Soc.. Publicado em: 2019-04
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6. COMPARISON BETWEEN ASPHALTENES (SUB)FRACTIONS EXTRACTED FROM TWO DIFFERENT ASPHALTIC RESIDUES: CHEMICAL CHARACTERIZATION AND PHASE BEHAVIOR
Asphaltenes are blamed for various problems in the petroleum industry, especially formation of solid deposits and stabilization of water-in-oil emulsions. Many studies have been conducted to characterize chemical structures of asphaltenes and assess their phase behavior in crude oil or in model-systems of asphaltenes extracted from oil or asphaltic residues
Quím. Nova. Publicado em: 2016-01
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7. Chemical modification of cobalt ferrite nanoparticles with possible application as asphaltene flocculant agent
Asphaltenes can cause enormous losses in the oil industry, because they are soluble only in aromatic solvents. Therefore, they must be removed from the petroleum before it is refined, using flocculant agents. Aiming to find new materials that can work as flocculant agents to asphaltenes, cobalt ferrite nanoparticles were chemically modified through acid-base
Mat. Res.. Publicado em: 02/04/2013
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8. A study of asphaltene-resin interactions
Foi realizado um estudo para investigar a interação entre asfaltenos (em soluções de tolueno) e resinas (em soluções de n-heptano). Para entender melhor o tipo de interação entre essas frações, quantificou-se o consumo de resina quando asfaltenos (dissolvidos em tolueno) foram precipitados com uma solução de n-heptano contendo resina. Os resultad
J. Braz. Chem. Soc.. Publicado em: 26/10/2012
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9. Investigation of asphaltene precipitation in miscible gas injection processes: experimental study and modeling
Asphaltene precipitation during natural depletion and miscible gas injection is a common problem in oilfields throughout the world. In this work, static precipitation tests are conducted to investigate the effects of pressure, temperature and gas type and concentration on asphaltene instability. Three different oil samples have been studied under reservoir c
Braz. J. Chem. Eng.. Publicado em: 2012-09
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10. Valoração dos produtos ultrapesados provenientes da destilação molecular de petróleo / Assessment of petrolem molecular distillation ultra-heavy products
Esta dissertação baseia-se na valoração da corrente de destilado e da corrente de resíduo geradas na destilação molecular (DM) do petróleo as quais são obtidas a partir do resíduo de vácuo (RV) proveniente da unidade de destilação a vácuo (UDV). Primeiramente se separou os asfaltenos da corrente ultrapesada do resíduo da DM (RDM), seguido do t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/10/2011
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11. Caracterização prévia de petróleo com vistas à otimização de processos / Previus crude oil characterization in order to optimize refinning processes
Esta tese tem como objetivo apresentar um estudo detalhado para a caracterização de petróleos, tanto no âmbito do desenvolvimento de modelos capazes de prever propriedades físico-químicas clássicas, como também avaliar os fenômenos associados a instabilidades decorrentes de características químicas. Para alcançar este objetivo, duas ações foram
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/06/2011
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12. Estudo da influência dos particulados no fenômeno de agregação dos asfaltenos por espectrometria de varredura óptica
The processing of national petroleums causes many operational problems due to the asphaltene aggregation phenomena. To evaluate the behavior of these phenomena, a study based on optical scan technique was carried out to understand the behavior of pure oils and their mixtures. The evaluation according to criteria established by ASTM D7061-06¹ gives a result
Química Nova. Publicado em: 2011