Page 38 - Separation process engineering
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permeate concentration of solute, g/L
c
w
concentration of solute at wall, g/L
c′
water concentration in permeate in Figure 17-17
C PL,p
liquid heat capacity of permeate, kJ/(kg °C)
C PV,p
vapor heat capacity of permeate, kJ/(kg °C)
d t
diameter of tube, cm
d tank
tank diameter, cm
D
2
diffusivity in solution, cm /s
D m
2
diffusivity in the membrane, cm /s
F p
3
volumetric flow rate of permeate, cm /s
F out
3
volumetric flow rate of exiting retentate, cm /s
F
solv
3
volumetric flow rate of solvent in RO, cm /s
molar flow rate, mol/s, mol/min, etc.
F′
mass flow rate, g/s, g/min, kg/min, etc.
h
½ distance between parallel plates, cm
h in
enthalpy of inlet liquid stream in pervaporation, kJ/kg
h out
enthalpy of outlet liquid retentate stream in pervaporation, kJ/kg
H A
3
solubility parameter, cc(STP)/[cm (cm Hg)]
H p
enthalpy of vapor permeate stream in pervaporation, kJ/kg
