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Abstract(s)
A aplicação da adsorção como um meio de separar misturas é hoje considerada uma
técnica competitiva entre outras clássicas como a destilação, extracção, etc. O método recorre
geralmente à coluna de adsorção contendo um sólido microporoso com propriedades
específicas para separar as misturas em causa.
Nesse aspecto, a presente dissertação foi dedicada à formulação de um modelo matemático
para simular o comportamento de adsorção de misturas gasosas que fluem através de
um leito fixo contendo adsorventes microporosos.
Determinou-se a solução numérica das equações diferenciais parciais acopladas dos balanços
de massa e energia resultantes do modelo, através da aplicação do método numérico
das linhas (MOL) em linguagem de programação MATLAB.
Os parâmetros físicos do modelo foram determinados com base em resultados de equilíbrio
e cinética de adsorção e também de correlações disponíveis na literatura. O efeito
dos vários parâmetros do modelo também foi estudado através de exemplos numéricos de
simulação como: Dispersão axial no leito, resistência à transferência de massa através do
modelo "Linear Driving Force - LDF", e tipo de isotérmica de adsorção.
Finalmente o modelo foi validado com a solução numérica de várias experiências de
adsorção do CO2 em zeólito 4A em leito fixo.
The application of adsorption as a means of separating mixtures is today considered a competitive technique among other classics such as distillation, extraction, etc. The method generally involves the adsorption column containing a microporous solid with specific properties for separating the mixtures concerned. In this aspect, the present dissertation was dedicated to the formulation of a mathematical model to simulate the adsorption behavior of gaseous mixtures that flow through a fixed bed containing microporous adsorbents. We determined the numerical solution of the coupled partial differential equations of the mass and energy balance resulting from the model, by applying the numerical method of lines (MOL) in MATLAB programming language. The physical parameters of the model were determined based on equilibrium and adsorption kinetics results and also on correlations available in the literature. The effect of the various parameters of the model were also studied through simulation as: Axial dispersion in the bed, resistance to mass transfer through the "Linear Driving Force - LDF"model, and type of adsorption isotherm. Finally, the model was validated through the numerical simulation of fixed bed adsorption experiments of CO2 in zeolite 4A.
The application of adsorption as a means of separating mixtures is today considered a competitive technique among other classics such as distillation, extraction, etc. The method generally involves the adsorption column containing a microporous solid with specific properties for separating the mixtures concerned. In this aspect, the present dissertation was dedicated to the formulation of a mathematical model to simulate the adsorption behavior of gaseous mixtures that flow through a fixed bed containing microporous adsorbents. We determined the numerical solution of the coupled partial differential equations of the mass and energy balance resulting from the model, by applying the numerical method of lines (MOL) in MATLAB programming language. The physical parameters of the model were determined based on equilibrium and adsorption kinetics results and also on correlations available in the literature. The effect of the various parameters of the model were also studied through simulation as: Axial dispersion in the bed, resistance to mass transfer through the "Linear Driving Force - LDF"model, and type of adsorption isotherm. Finally, the model was validated through the numerical simulation of fixed bed adsorption experiments of CO2 in zeolite 4A.
Description
Keywords
Modelação matemática Simulação numérica Curvas de Breakthrough Adsorção de CO2 Zeólito 4A