Guidelines for Selecting Batch Processes

Douglas [7] gives an excellent comparison of batch and continuous processes. The factors that favor batch operations are summarized as follows:
• Production rates
• Sometimes batch process, if the plants have a production capacity of less than 10 × 106 lb/yr. (5 × 106 kg/h).
• Usually batch process, if the plants have a production capacity of less than 1 × 106 lb/yr. (0.5 × 106 kg/h)
• Where multi-product plants are produced using the same processing equipment.
• Market forces:
Where products are seasonal (e.g. fertilizers).
Short product lifetime (e.g. organic pigments).
• Operational problems:
Long reaction times (i.e. when chemical reactions are slow).
Handling slurries at low flowrates.
Rapidly fouling ...

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