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

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

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Process Equipment and Plant Design
For a cylindrical shell, (subject to the thickness of uppermost course being more than the minimum for diaofthe tank in question), the thickness of the courses of shell

May decrease or increase upwards depending upon whether vacuum or positive pressure would be maintained inside the shell
Increases upwards
Remains same throughout
Decreases upwards

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