Which of the following is correct for the off-centre impellers?
Options
A. Off-centre impellers can be used with any size reactor
B. Off-centre impellers should only be used with reactors with volumes less than 10 m3
C. The impeller should never be placed in an off-centre position
D. Off-centre impellers can be used when volume is greater than 10 m3
Correct Answer
Off-centre impellers should only be used with reactors with volumes less than 10 m3
Agitation and Aeration problems
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1. A cylindrical reactor fitted with Rushton Turbine has a liquid volume of 100,000 litres. It has an aspect ratio (the ratio of the channel height to the width) of 2:1. The diameter of the impeller should be approximately:
Correct Answer: The air escapes without being distributed by the agitator
7. For aerated mixing vessels in an aqueous solution, the mass transfer coefficient (kL) co-relating power consumption (Pm) and fermenter volume (V) can be expressed as
9. A fermentation system has a KLa of 3 s-1 and a C0* of 5 ppm of O2. If the bulk liquid is completely depleted of oxygen, then the oxygen transfer rate will be equal to