Process Equipment and Plant Design
Optimum reflux ratio in a continuous distillation column is determined by the

None of these
Total cost consideration (fixed cost of the column plus the cooling water & steam cost)
Maximum permissible vapour velocity
Flooding limit of the column

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Process Equipment and Plant Design
Weep holes provided in the plates of a distillation column

All of these
Facilitate draining out liquid from a tray when the unit is not in operation
Are normally located near the overflow weir so that any delivery of liquid during operation follows approximately the same path as the overflow fluid
Must be large enough (usually 1/4" to 5/8" dia) to prevent plugging but should not deliver excessive amount of fluid during operation

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