Flory Huggins Theory
Mostrando 1-5 de 5 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. 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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3. Calculation of liquid-liquid equilibrium of aqueous two-phase systems using a chemical-theory-based excess Gibbs energy model
Mixtures containing compounds that undergo hydrogen bonding show large deviations from ideal behavior. These deviations can be accounted for through chemical theory, according to which the formation of a hydrogen bond can be treated as a chemical reaction. This chemical equilibrium needs to be taken into account when applying stability criteria and carrying
Brazilian Journal of Chemical Engineering. Publicado em: 2004-09
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4. APPROCHE THERMODYNAMIQUE ET CINETIQUE DE L EXTRACTION A DEUX PHASES AQUEUSES À L AIDE DE TENSIOACTIFS NON IONIQUES / A THERMODYNAMIC AND KINETIC APPROACH OF TWO-AQUEOUS PHASE EXTRACTION WITH NON-IONIC SURFACTANTS
The present work forms a part of the study of a two-aqueous phase extraction process using the occurrence of a cloud point (Tc) in the phase diagrams of water/polyethoxylated nonionic surfactant systems. Its main goals were: modelling and predicting the corresponding cloud point curves, investigating the mechanism controlling the mass transfer between phases
Publicado em: 2004
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5. Equilibrio de fase liquido-liquido entre poli(etilenoglicol) e hidrocarbonetos aromaticos / Liquid-liquid phase equilibrium of poly(ethylene glycol) and aromatics hidrocarbons
Este trabalho envolve o estudo do equilíbrio de fase líquido-líquido apresentado pelo sistema poli(etileno glicol), (PEG) e hidrocarbonetos aromáticos (HA). Os diagramas de fase são do tipo UCST (upper critical solution temperature), sendo que o grau de miscibilidade é fortemente dependente da massa molar do PEG e do número de CH2 presentes na cadeia
Publicado em: 2001