Chemical Reaction Engineering
In a semi-batch reactor

Residence time is constant
Both the reactants flow counter-currently
Velocity of reaction can be controlled
Maximum conversion can be controlled

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Chemical Reaction Engineering
For the same residence time, which one will give the maximum conversion?

Single stirred tank (v = 5 litres)
Two stirred tank (each of 2.5 litres) in series
Single tubular flow reactor (v = 5 litres)
Stirred tank followed by tubular flow reactor (each of 2.5 litres)

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Chemical Reaction Engineering
For a heterogenous catalytic reaction, A + B → C, with equimole feed of A and B, the initial rate - rA0 is invariant with total pressure. The rate controlling step is

Desorption of C
Surface reaction between absorbed A and absorbed B
Surface reaction between A in the gas phase and absorbed B
Surface Kc/(1 + TS) reaction between absorbed A and B in the gas phase

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