Question 4: A second order liquid phase reaction can be represented by: 2A-R The

Question

Question 4: A second order liquid phase reaction can be represented by: 2A-R The reaction rate expression for the reaction is given by The plant has two spare tanks available of volumes V1 and V2 where V-2V2These tanks are to be operated in series at steady state and can be assumed to be well mixed. The reactant stream entering the first reactor contains no product. a) Determine quantitatively in which order these two tanks should be connected in order to give the highest conversion to product R b) Determine quantitatively if there is any merit in putting the two tanks in parallel. 1 F2 F6 F7 F8

Explanation / Answer

a. It is a thumb rule that always connect CSTR in increasing order of Volume for positive order reaction. Late mixing is desire because as per the rate equation the rate of reaction is directly proposonal to C2a.

So, If we use small CSTR V1 first the outlet concetratoin of Ca is higher (small volume = less dilution = more concentration) and rate will become faster.

If Big CSTR V2 is used first then the outlet concerntration will lesser than above arrangement. (Large volume = More dilution = less concentration) and rate will become Slower.

B. Merits of putting 2 tanks in parallel

1. When Total Volumetric flowrate is very high

2. For better heat removing and mixing

3. Very small conversion is desirable

b.

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