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Comportamento Interfacial de Asfaltenos Em Sistemas Óleo/Água
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ISBN10: 6208841445
ISBN13: 9786208841447
Publisher: Novas Edicoes Academicas
Published: Apr 15 2025
Pages: 100
Weight: 0.32
Height: 0.24 Width: 6.00 Depth: 9.00
Language: Portuguese
ISBN13: 9786208841447
Publisher: Novas Edicoes Academicas
Published: Apr 15 2025
Pages: 100
Weight: 0.32
Height: 0.24 Width: 6.00 Depth: 9.00
Language: Portuguese
No presente trabalho, a técnica de tensiometria de gota pendente foi usada para uma melhor descrição das propriedades interfaciais reológicas de asfaltenos, extraídos de dois petróleos brasileiros, em interfaces tolueno/água e heptol (heptano+tolueno)/água, variando-se as proporções de solventes orgânicos em 1:1 e 1,5:1 e a concentração de asfaltenos. Isotermas de adsorção e equações de estado de Gibbs e Langmuir foram investigadas. Para sistemas contendo tolueno como solvente, a atração entre as moléculas do solvente e moléculas de asfalteno é forte devido a sua alta solubilidade, reduzindo assim a atividade interfacial de moléculas de asfalteno. Para sistemas contendo heptol como solvente a interação entre a molécula de asfalteno e as moléculas do solvente é fraca, resultando em um incremento na atividade interfacial das moléculas de asfaltenos. As propriedades interfaciais reológicas dilatacionais dos sistemas estudados (IFT, pressão de superfície e módulo de elasticidade) dependem exclusivamente da cobertura interfacial. Tais resultados são úteis para entender como ocorrem os processos de adsorção de asfaltenos em interfaces fluido/fluido à nível microscópico.
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