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:
Options
A. 1.3 m
B. 3.3 m
C. 5.3 m
D. 7.3 m
Correct Answer
1.3 m
Agitation and Aeration problems
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1. Pure oxygen, if used instead of air will increase oxygen transfer rates because
Options
A. the saturation concentration of oxygen is higher
B. the bubble size is smaller
C. the oxygen transfer coefficient is larger
D. the partial pressure of oxygen in the gas phase is lower
Correct Answer: The air escapes without being distributed by the agitator
8. 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
10. 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