Pseudocomponents
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. QUADRATURE ALGORITHMS FOR PHASE EQUILIBRIUM OF CONTINUOUS MIXTURES
Abstract Several methods for computing the Gauss-Christoffel quadrature used for the adaptive characterization of continuous mixtures were compared as to their efficiency and robustness. Two mixtures with molar fraction distribution given by truncated gamma distributions were used. We analyzed the Product-Difference, the Golub-Welsch, the Long Quotient-Modif
Braz. J. Chem. Eng.. Publicado em: 09/12/2019
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2. Experimental density data and excess molar volumes of coconut biodiesel + n-hexadecane and coconut biodiesel + diesel at different temperatures
The density of the pure component (n-hexadecane), pure pseudo-components (coconut biodiesel and diesel) and pseudo-binary mixtures of coconut biodiesel with n-hexadecane (or + diesel) were measured at temperatures 293.15, 313.15, 333.15, 353.15 and 373.15 K and atmospheric pressure, over the entire composition range (mole fractions from 0.1 to 0.9, with a st
Braz. J. Chem. Eng.. Publicado em: 2014-06
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3. Inovações na produção de hidrolisados de soja : modelagem e análise econômica de processo
Soybean and its derivatives have the desired properties for food either for humans or various animals because of its high protein content, which is associated to a good balance of amino acids. However, when the protein is hydrolyzed into smaller peptides, the nutritional value can increase further. A product with high nutritional value added but which does n
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/04/2012
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4. Estudo de sistemas multicomponentes no processo de injeção cíclica de vapor
No Nordeste brasileiro existem reservatórios de óleos pesados, nos quais se utiliza a injeção de vapor como método de recuperação. Este processo permite diminuir a viscosidade do óleo, aumentando a sua mobilidade e melhorando o volume de óleo a ser recuperado. A injeção de vapor é um método térmico e ocorre na forma contínua ou cíclica. A inj
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/09/2010
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5. 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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6. Dispersing chemicals in the granulometric analysis of latosols / Dispersantes químicos na análise granulométrica de latossolos
The most accurate textural analysis result is dependent on the soil samples complete dispersal and maintenance of the dispersed phases stability. The solutions high pH can be considered to be determinant in the dispersion of soils with pH dependent loads. Under the same pH and osmotic pressure conditions, the higher the ions ionic hydrated radius, the more e
Publicado em: 2008
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7. Avaliação do método Wavelet-Galerkin multi-malha para caracterização das propriedades de petróleo e subprodutos. / Wavelet-Galerkin multigrid methods evaluation for characterization of the properties of petroleum and subproducts.
Atualmente, restrições ambientais impostas à industria de refino de petróleo estão fazendo com que se procure otimizar os seus processos. Uma das maneiras de se alcançar este objetivo é através da melhoria dos métodos analíticos de caracterização e dos métodos de representação, cuja finalidade é permitir maior precisão na simulação. O mét
Publicado em: 2007
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8. Aplicação de simulated annealing para o calculo de equilibrio de fases de misturas complexas / Simulated annealing applied to the calculation of phase equilibria for a complex misture
In many industrial processes, during the phase of refining and separation, products form very complex mixtures. It is the case, for example, of the vegetal oil and citric acid industries. As these mixtures are formed by many components, determination and calculation of thermodynamic properties and phase equilibrium are very complicated. In this way, the use
Publicado em: 2007
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9. O modelamento estatístico de misturas: experimento tutorial usando voltametria de redissolução anódica
This work illustrates the modeling procedure for a solvent mixture using the simplex- centroid approach. The selected experiment was the optimization of the peak current observed in the direct determination of nickel by anodic stripping voltammetry (ASV) in a solvent mixture composed of N,N-dimethylformamide, ethanol and water. The text is presented in a tut
Química Nova. Publicado em: 2005-12
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10. Modeling and simulation of a pseudo-two-phase gas-liquid column reactor for thermal hydrocracking of petroleum heavy fractions
This work presents a model to predict the behavior of velocity, gas holdup and local concentration fields in a pseudo-two-phase gas-liquid column reactor applied for thermal hydrocracking of petroleum heavy fractions. The model is based on the momentum and mass balances for the system, using an Eulerian-Eulerian approach. Using the k-epsilon model,fluid dyna
Brazilian Journal of Chemical Engineering. Publicado em: 2002-07
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11. Modeling and simulation of hydrodemetallation and hydrodesulfurization processes with transient catalytic efficiency
A model is presented for the description of the concentration behavior of organometallic and sulfurated compounds in hydrodemetallation and hydrodesulfurization catalytic processes, where catalyst effectiveness decreases with time. Due to the complexity of the mixture, an approach based on pseudocomponents was adopted. The system is modeled as an isothermal
Brazilian Journal of Chemical Engineering. Publicado em: 2000-06
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12. Modelling and simulation of the hydrocracking of heavy oil fractions
This work presents a model to describe the behavior of the concentration of constituents of heavy fractions from petroleum during the hydrocracking process. An approximation based on pseudocomponents or lumps is adopted due to the complexity of the mixture. The system is modeled as an isothermal tubular reactor with an axial dispersion, where the hydrogen fl
Brazilian Journal of Chemical Engineering. Publicado em: 2000-03