Download PDF by Unknown Author Unknown Author: Powtech '83 Particle Technology. Event No. 280 of the EFCE

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ISBN-10: 0080287859

ISBN-13: 9780080287850

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Extra info for Powtech '83 Particle Technology. Event No. 280 of the EFCE

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Ultimately, expressions are needed to allow calculation of rate coefficients from properties of the process materials, proposed operating conditions and equipment design parameters. Experimental studies are in progress to obtain some of the data needed for such expressions for granulation. E. SYMPOSIUM SERIES NO. 69 CONCLUSIONS Population balance modelling techniques have been developed to allow prediction of the effects of several simultaneous growth and competing mechanisms in granulation. Limited comparison with experimental data appears promising.

The start-up of a continuous process is also similar to this case. 1 in (b). Growth by layering is occurring simultaneously in both cases. With increased agglomeration, larger sizes are reached in a given time, but the distribution is broader. E. SYMPOSIUM SERIES NO. 69 same size distribution as the contents at the time of removal. The predicted effect of size dependent growth for a solely layering process, operated batchwise, can be seen in Figures 4 and 5. With the layering growth velocity directly proportional to particle size (Figure 5 ) , the upper ends of the product size distributions are extended and the distributions broaden, as expected.

The combined effects of growth and competing mechanisms are taken into account. At this stage, the rate coefficients for these mechanisms are set arbitrarily or on the basis of previous experimental work. Inversion of exp­ erimental particle size data can provide values for the coeff­ icients under specified conditions. In the longer term expressions are needed for these rate coefficients in terms of materials properties, equipment design parameters and operating conditions. The work is presently directed at granulation processes, especially spouted bed and fluidized bed granulation, but the population balance models could be applicable to some other particle formation processes.

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Powtech '83 Particle Technology. Event No. 280 of the EFCE by Unknown Author Unknown Author


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