Chemical Reaction Engineering
The space time is equivalent to the holding time in a steady state mixed reactor for

Gas reactions with changing no. of moles
Variable fluid density systems
Constant fluid density systems
Non-isothermal gas reaction

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Chemical Reaction Engineering
For reactions in parallel viz A → P (desired product) and A → Q (unwanted product), if the order of the desired reaction is higher than that of the undesired reaction, a

Single CSTR is the most suitable
Both A and B
Tubular reactor is preferred over a single CSTR for high yield
Batch reactor is preferred over a single CSTR for high yield

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Chemical Reaction Engineering
In the reversible reaction of the type, A + B ⇋ AB, in general

The combination reaction will be endothermic, while the dissociation reaction will be exothermic
Neither of the reactions will be en-dothermic
Both forward and backward reactions will be exothermic
The combination reaction will be exothermic, while the dissociation reaction will be endothermic

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