Desenvolvimento de leitos fixos a base de crisotila para reatores continuos

AUTOR(ES)

Luis Melchert Faber Schmutzler

DATA DE PUBLICAÇÃO

1998

RESUMO

The addition of fiber glass, admixed with activated chrysotile improves the structural properties of packed-beds, resulting in highlys stable bases for use as continuous reactor nucleus. The oxidizing capacity of MnO2 and TiO2 immobilized onto chrysotile in continuous reactors stabilized with fiber glass was investigated. Methanol, ethanol, n- propanol, i-propanol, n-butanol, 2-butanol, were tested. No oxidation was detected. However, the fixed bed remained intact despite of the gas flow. Different values of the Fanning friction factor were found for the different alcohols. A computerized system was built to measure the temperature in 14 points inside the reactor, and 1 in the bath. A series of experiments were done to evaluate the quality of the data acquired by the system. Two packed-bed nucleus for two main series of sucrose fermentation experiments were made, one with 5% chrysotile / fiber glass w/w, and other with 10% w/w. Both had 538 mL of total volume, and 120 mL of void volume. The yeast cells were immobilized after complete assembling of the reactor. Different temperature, feed flow rate, and sucrose concentration where applied. A maximum volumetric productivity of 12.3 gLh was obtained. The gas hold up was nearly zero, and the head loss was less than 5 mmHg. A volumetric effectiveness experiments runned with red grape juice showed that a part of the reactor was not participating of the reactions. Despite of the problems of axial dispersion and preferential flow ways, the admixture of fiber glass to chrysotile for yeast immobilized continuous fermentation reactors showed advances optimizing the CO2 flow and the head loss through the fixed bed , with low loss of fibers and cells. The resolution of the electronic data acquisition system allowed the measure of heterogeneities in the heat profiles of the reaction in the inner space of the reactor.

ASSUNTO(S)

crisotila

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