Chemical Reaction Engineering
Batch process is preferred over continuous process, when the

Product yields and quality can not be achieved in continuous process, because of long residence time
All of these
Sales demand of product is not steady
Same equipment can not be used for several processes of the same nature

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Chemical Reaction Engineering
A batch reactor is

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

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