Homework Answers
When the particle size is decreased by 15 %, the surface area available for the catalyst increases, as a result of this conversion should increase. But the interesting thing is this area effect is counteracted by the pressure drop effects.
When the particle size decreased by 15 %, the void fraction in the reactor decreases, as a result, the pressure drop increases, because of that the flow rate also increases( since all conditions are same)
, as a result of this, the residence time decreases. As a consequence, the conversion decreases.
When the particle size is decreased by 15% these two effects are counteracting and canceling exactly each other. As a result of this, the conversion remains constant.
But when the particle size again decreased by 20% the pressure drop effect is more prominent here and it is canceling the increasing of conversion by area effect and results in a decrease of conversion.
When the particle size is increased, both the effect will acts in the same direction for the decrement of conversion. They are not counteracting they are unidirectional acting.
So as a result when the particle size is increased the conversion gets decreased.
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