D

Diffusion coefficient for key component, ft2/s

D'

Distillate flow rate, lb-mole/h

da

Outer diameter of packing particle, in

dH

Fractional height element, ft

dy

Difference in mole fraction of the more volatile component across a fractional height element (Eq. 9.1) j

<

Equivalent diameter of structured-packing flow channel, in, j values given in Table 8.1

dp

Packing diameter, in

Dp

Packing diameter, ft

d.

Same as DT

Dt

Tower diameter, ft

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