Q (1): Choose the correct answer: I. The rate equation for the elementary reacti
ID: 703701 • Letter: Q
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Q (1): Choose the correct answer: I. The rate equation for the elementary reaction, B+2D-3R is: (a) 2. In finite recycle ratio indicates that the reactor is: (a) batch; (b) plug flow (c) mixed flow. 3. For any number of reactions in series, the step that has the greatest influence on the overall reaction rate is: (a) the slowest step; (b) the 4. For constant density system, the holding time equals to the :(a) 5. For flow reactors connected in parallel the space time must be: (a) 6. For all nth order reactions, n > 0, and for any given duty; mixed final step; (c) the fastest step. batch time; (b) space time; (c) space velocity. the same; (b) non identical; (c) doubled for each parallel line. flow reactor always needs: (a) larger volume; (b) smaller volume than does plug flow reactor, (c) the same volume. 7. When the number of mixed flow reactors goes to infinity (N-oo) the rate equation reduces to: (a) batch; (b) mixed; (c) plug flow equation 8. For zero order reaction carried out in mixed flow reactor, the volume required: (a) equals; (b) does not equal; (c) larger than that required for plug flow reactor.Explanation / Answer
1) Rate equation for elementry reaction say aA+bB -> cD
then -rA = KCA^a CB^b
so answer is b =- rB= K*CB*CD^2
2) For mixed Flow Recycle ratio will be infinity and For plug flow this will be zero
3)Since reaction cannot be faster than the slowest step ,Rate determing step will be always the slowest step answer is a
4)Holding time = Space time for constant density system
5)Flow reactors connected in parallel,space time must be same else convesion will be different
6)n>0 ,mixed flow reactor always need same volume
7)Plug flow equation
8)For zero order reation in mixed flow reactor ,volume required equal to that required for plug flow reactor
For cstr ,V(CSTR) =(Fout -F in)/ rA
& for PFR , dV(PFR) =dFA/rA
hence for zero order both will be of equal volume
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