Chemical Reaction Engineering
Organic catalysts differ from the inorganic catalyst in the sense that the former is

Active at very high temperature only
Prohibitively costly
Active at cryogenic temperatures only
Proteinous in nature

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Chemical Reaction Engineering
A batch reactor is

Suitable for gas-phase reactions on commercial scale
Least expensive to operate for a given rate
Suitable for liquid phase reactions involving small production rate
Most suitable for very large production rate

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Chemical Reaction Engineering
In case of staged packed bed reactors carrying out exothermic reaction, use

All of these
Cold shot operations for a dilute solution requiring large preheating to bring the stream upto the reaction temperature
Plug flow for dilute liquid requiring no large preheating of feed
High recycle for pure gas

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