Oxidação catalitica de etanol a acetaldeido sobre catalisador de oxido de ferromolibdenio

AUTOR(ES)
DATA DE PUBLICAÇÃO

1985

RESUMO

In order to improve the oxidation process for obtaining acetaldehyde, testes of new catalysts with better activity, stability and selectivity are necessary. This work studies the kinetic of ethanol oxidation to acetaldehyde over Fe-Mo catalyst. The kinetic data, in the integral reactor, was obtained in the range of 180 to 240ºC by means of synthetic air and absolute ethanol at the atmospheric pressure, in the fixed bed of catalyst, diluted with stainless steel particles. It was necessary to dilute the catalytic bed, in order to reduce the apparent rate of reaction per unit of volume, considering that the reactor could operate in isothermal conditions. The thermostatic bath with thermal fluid, with good heat transfer properties was used to control the tcmperature of the reactor. The interpretation of the kinetic data for obtaining a rate equation was accomplished by Temkin s mechanism. The proposed mechanism considers the adsorption of the molecular oxygen in a single active site. The Fe-Mo catalyst cxhibits better performance than the best known catalysts by showing high conversions, good stability and a total yield in acetaldehyde. By means of the rate equation, a reactor simulation was possible under industrial conditions in order to evaluate the effects of temperature feed, of air/ethanol molar ratio and of the superficial mass rate or flow in the parametric sensitivity of the reactor. We have used reactor internal diameters of 9,3 and 17 mm. The control of the reactor temperature was possible by changing the ethanol rate of flow. Also, we have used high values of air/ethanol molar ratio in order to prevent the inflammability ranges of the mixtures in the reactor

ASSUNTO(S)

alcool oxidação

ACESSO AO ARTIGO

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