Page 31 - Separation process engineering

mass raffinate, kg

Holdup raffinate phase in tank plus settler, kg

R e

dimensionless Reynolds number, Eq. (15-33b)
Re
settler
Reynold’s number for settler, Eq. (13-60a)

S
solvent flow rate kmol/h or lbmol/h

S
tray spacing, inches, Eq. (10-47)

S
moles second solvent in constant-level batch distillation

mass of solvent, kg
S

solvent flow rate, kg/h
Sc L

Schmidt number for liquid = μ/(ρD)

Sc v

Schmidt number for vapor = μ/(ρD)
Sh , Sh , Sh y
x
c
dimensionless Sherwood numbers, Eq. (15-33a)

St , St , St y
c
x
dimensionless Stanton numbers, Eq. (15-33d)
t
time, s, min, or h

t batch

period for batch distillation, Eq. (9-28)
t down

down time in batch distillation

(t – t )
f,95 0
residence time in extractor for 95% extraction, Eq. (16-105), s
t , t
L V
average residence time per pass for liquid and vapor, s

,residence
liquid residence time, Eq. (16-111c), s