In a uniform environment 4mm solid particles are 87.5% converted to product in 5 min . the solids are unchanged in size during reaction , and the ash diffusion step is known to be controlling .What mean conversion is obtainable in a fluidized bed reactor operating with he same environment but using a feed consisting of equal weights of 2-mm and 1-mm particles . the mean residence time of solids in the reactor is 30mins

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