Estudo da influencia da diluição dos reagentes com agua na oxidação de etanol a acetaldeido sobre catalisadores de ferro - molibdenio

AUTOR(ES)
DATA DE PUBLICAÇÃO

1988

RESUMO

The use of water vapor as vehicle to remove the heat in highly exotermic reactions needs more understanding of the effect produced by the diluent on the reaction rate. This work studies the influence of the reagents ditution with water on ethanol oxidation to acetaldeyde over iron-molibdenum catalyst. The kinetics data was obtained at atmosphere pressure, in a isothermal, integral, fixed bed reactor, with the addition of water vapor in the reactor feed, in the range of temperature from 180 to 240 DEGREES C. Good isothermicity was obtained by dilution of catalytic bed with stainless steel particles. A reaction mechanism was proposed considering the molecular adsorption of oxygen on a single active site and reaction with vaporous ethanol. The rate equation obtained represented satisfactory the water inibition effect on the reaction. The behavior of the multitube fixed bed reactor, with external countercurrent cooling, was simulated using unidimensional homogeneous and heterogeneous models, operation with introduction of water and removal of equal volume of nitrogen from the feed. The water influence on the reactor temperature profiles and on the parametric sensitivity about the inlet thermal fluid temperature, the superficial mass velocity and the feed oxygen/ ethanol molar ratio was analysed. The addition of water showed to be suitable help for the reactor temperature control.

ASSUNTO(S)

catalisadores de ferro testes quimicos e reagentes

ACESSO AO ARTIGO

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