Page 45 - Separation process engineering

L
length of packing in column, m or cm

L MTZ

length of mass transfer zone, Figure 18-23, m or cm
M

molecular weight of solute, g/mol or kg/kmol
M i

multipliers in Eqs. (18-29), dimensionless

N
equivalent number of plates in chromatography, Eq. (18-78)

N Pe

Peclet number, dimensionless, Eq. (18-62)
p A

partial pressure of species A, mm Hg, kPa, or other pressure units

p h

high pressure, mm Hg, kPa, or other pressure units
p L

low pressure, mm Hg, kPa, or other pressure units
Pe
L
Peclet number based on length, dimensionless, Eq. (18-78a)

q A

amount of species A adsorbed, kg/kg adsorbent, mol/kg adsorbent, or kg/L
q A,max

maximum amount of species A that can adsorb, kg/kg adsorbent, mol/kg
adsorbent, or kg/L

amount adsorbed in equilibrium with feed concentration, same units as q A

q i

average amount of species i adsorbed, kg/kg adsorbent, mol/kg adsorbent, or
kg/L

amount adsorbed that would be in equilibrium with fluid of concentration c ,
i
same units as q A

Q
3
volumetric flow rate, m /s, L/min, etc.
r p

pore radius, m or cm