Overall distillation column efficiency for most of the refinery columns can be given by (for μ = 0.07 – 1.4 cp and relative volatility < 4) (where ε = overall column efficiency, % μ = molal average viscosity of feed at average column temperature and pressure, cp Δp = pressure drop per tray, psi) ?
(A) η = 17 – 61.1 log μ
(B) η = 24.6 (Δp/μ)
(C) η = 1.66 – 0.25 log μ
(D) η = 0.25 log μ – 1.67
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