Abstract
The contact time distribution (CTD) is required in order to predict the performance of gas/solid fluidized-bed reactors. By using certain plausible assumptions, the CTD can be determined from two total residence time decay functions for an adsorbable tracer corresponding to different extents of adsorption. The gas-phase residence time distribution (RTD) can also be determined. The total residence time decay functions were measured using a 6 inch diameter fluidized bed of commercial cracking catalyst with air as the fluidizing gas and nitrous oxide as the tracer. The determinations of the CTD and RTD were carried out at various flow rates and temperatures. The fraction bypassing can be obtained from the CTD curves.
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