Process Equipment and Plant Design
In case of a continuous distillation column, increase in reflux ratio may result in the

Greater cost for the reboiler heat supply
All of these
Greater cost for the condenser coolant
Lower fixed charges for the column

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Process Equipment and Plant Design
When one of the fluids is highly corrosive and has fouling tendency, it should

Flow outside the tube, when the flow is counter-current and inside the tube when the flow is co-current
Preferably flow inside the tube for its easier internal cleaning
Perferably flow outside the tube
Flow at a very slow velocity

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