Page 40 - Separation process engineering

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permeability of species A in the membrane, cc(STP) cm/[cm s cm Hg]
R
rejection coefficient in wt frac units, dimensionless, Eq. (17-24a)

R°
inherent rejection coefficient (M = 1), dimensionless

R c

rejection coefficient in conc. units, dimensionless, Eq. (17-48)
R

tube radius, cm
Re

Reynolds number, dimensionless, Eq. (17-35b)
Sc

Schmidt number, dimensionless, Eq. (17-35c)
Sh

Sherwood number, dimensionless, Eq. (17-35a)
t ms

thickness of membrane skin doing separation, μm, mm, cm, or m

T
temperature, °C

T ref

reference temperature, °C
u b

bulk velocity in tube, cm/s

v solvent
3
partial molar volume of the solvent, cm /gmole
x

wt frac of retentate in pervaporation. In binary system refers to more permeable
species.
x
g
wt frac at which solute gels in UF

x p
wt frac solute in liquid permeate in RO and UF

x r

wt frac solute in retentate in RO and UF
y

wt frac of permeate in pervaporation. In binary system refers to more
permeable species.

y p