Avaliação da capacidade de adsorção do CO2 em zeólita 12X com gases sintéticos e originados da pirólise do lodo de esgoto
This work depicts a study of the adsorption of carbon dioxide on zeolite 13X. The activities were divided into four stages: study batch adsorption capacity of the adsorbent with synthetic CO2 (4%), fixed bed dynamic evaluation with the commercial mixture of gases (4% CO2, 1.11% CO, 1 2% H2, 0.233% C...
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Formato: | Dissertação |
Idioma: | por |
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Universidade Federal do Rio Grande do Norte
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Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/15836 |
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Resumo: | This work depicts a study of the adsorption of carbon dioxide on zeolite 13X. The
activities were divided into four stages: study batch adsorption capacity of the adsorbent
with synthetic CO2 (4%), fixed bed dynamic evaluation with the commercial mixture of
gases (4% CO2, 1.11% CO, 1 2% H2, 0.233% CH4, 0.1% C3, 0.0233% C4 argon as inert
closing balance), fixed bed dynamic modeling and evaluation of the breakthrough curve
of CO2 originated from the pyrolysis of sewage sludge. The sewage sludge and the
adsorbent were characterized by analysis TG / DTA, SEM, XRF and BET. Adsorption
studies were carried out under the following operating conditions: temperature 40 °C
(for the pyrolysis of the sludge T = 600 °C), pressures of 0.55 to 5.05 bar (batch
process), flow rate of the gaseous mixture between 50 - 72 ml/min and the adsorbent
masses of 10, 15 and 20 g (fixed bed process). The time for the adsorption batch was 7
h and on the fixed bed was around 180 min. The results of this study showed that in
batch adsorption process step with zeolite 13X is efficient and the mass of adsorbed
CO2 increases with the increases pressure, decreases with temperature increases and
rises due the increase of activation temperature adsorbent. In the batch process were
evaluated the breakthrough curves, which were compared with adsorption isotherms
represented by the models of Langmuir, Freündlich and Toth. All models well adjusted
to the experimental points, but the Langmuir model was chosen in view of its use in the
dynamic model does not have implications for adsorption (indeterminacy and larger
number of parameters such as occurred with others) in solving the equation. In the fixed
bed dynamic study with the synthetic gas mixture, 20 g of mass adsorbent showed the
maximum adsorption percentage 46.7% at 40 °C temperature and 50 mL/min of flow
rate. The model was satisfactorily fitted to the three breakthrough curves and the
parameters were: axial dispersion coefficient (0.0165 dm2/min), effective diffusivity
inside the particle (dm2/min 0.0884) and external transfer coefficient mass (0.45
dm/min). The breakthrough curve for CO2 in the process of pyrolysis of the sludge
showed a fast saturation with traces of aerosols presents in the gas phase into the fixed
bed under the reaction process |
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