VACUUM DRYING KINETICS OF ACTIVATED CARBON-SUPPORTED ZINC ACETATE CATALYST

The influence of drying parameters including temperature, vacuum degree and thickness of material etc. on vacuum drying catalyst of zinc acetate/activated carbon were studied. The results showed that vacuum drying was fit for the catalyst of zinc acetate/activated carbon drying. The vacuum drying of catalyst only had falling drying rate period. the induction and constant drying rate period did not exist. Vacuum degree and temperature both affected the drying kinetics, but the effect of vacuum degree was in terms with drying temperature. The higher temperature, higher was the drying rate and the vacuum degree had obviously effect on initial drying rate. The higher thickness, higher was the drying time, but drying intensity was slightly increased. The drying temperature of catalyst should at 60°C-80°C for vacuum drying in order to avoid surface pulverization and get higher drying rate. Through the orthogonal experiment of temperature, vacuum degree and bed height, it was concluded that the temperature had the most important effect for the drying intensity. Comprehensive analysis that including drying quality and drying economy showed the drying process of at 40mm bed height, 9000Pa and 80°C was very meaningful for designing the tower continuous dryer of catalyst.