Overall distillation column efficiency for most of the refinery columns can be given by (for = 0.07 - 1.4 cp and relative volatility < 4) (where = overall column efficiency, % = molal average viscosity of feed at average column temperature and pressure, cp p = pressure drop per tray, psi)

Overall distillation column efficiency for most of the refinery column

1.	Overall distillation column efficiency for most of the refinery columns can be given by (for = 0.07 - 1.4 cp and relative volatility < 4) (where = overall column efficiency, % = molal average viscosity of feed at average column temperature and pressure, cp p = pressure drop per tray, psi)
A.	= 17 - 61.1 log
B.	<img src="/_files/images/chemical-engineering/process-equipment-and-plant-design/565-83-1.png">
C.	= 1.66 - 0.25 log
D.	= 0.25 log - 1.67
Answer» B. <img src="/_files/images/chemical-engineering/process-equipment-and-plant-design/565-83-1.png">