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. ? = 0.25 log ? 1.67

B. ? = 24.6 (?p/?)

C. ? = 17 61.1 log ?

D. ? = 1.66 0.25 log ?

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