Estudo do efeito da agua na reação de oxidação catalitica de etanol para acetaldeido, visando redução de VOC

AUTOR(ES)
DATA DE PUBLICAÇÃO

1995

RESUMO

The kinetics of ethanol oxidation to acetaldehyde on Fe-Mo catalyst, was studied in a fixed bed tubular reactor, in the temperature range 235- 260 DEGREES C at atmospheric pressure. A search for the process improvement was made, by means of addition of water in the feed. Water act as vehicle to remove the heat and to reduce emissions of toxic organics in atmosphere. The experimental data were obtained in steady state conditions, with minimum thermal gradient and without mass transfer effects. In this conditions, the Fe-Mo catalyst showed good stability and total selectivity in acetaldehyde. Conversions as high as 80% in acetaldehyde were achieved, and the integral method for data analysis was used. The kinetic of reaction was described by mean of a model that suppose adsorption of molecular oxygen without dissociation, taking in account that part of the sites actives were ever covered by adsorbed water molecules. The rate equation was obtained by Temkin?s method. It was noted that the water inhibit the reaction rate, but increase the temperature range to total selectivity in acetaldehyde. The use of water in the feed, suggests a oxygen recycle, reducing the gaseous waste to the atmosphere... Note: The complete abstract is available with the full electronic digital thesis or dissertations.

ASSUNTO(S)

agua - uso compostos organicos oxidação alcool

ACESSO AO ARTIGO

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