Design of an Absorber

1
Design of an Absorber
Gmt,yt
Lmt,xt
Lm,x
Op. line
?Z
ZT
y/1-y (or) y
Gm,y
Eq. line
Lmb,xb
Gmb,yb
x/1-x (or) x
2
Absorber Design -- Continued
Rate of mass transfer
Written in terms of overall mass transfer
coefficients
Individual and overall related
3
Number of transfer units
For dilute solutions (gas and liquid
concentrations small)
Log mean driving force
If both operating and equilibrium lines are
straight
where
General method is graphical.
4
Height of a Transfer Unit
Or as in text
Obtain individual heights from
Table 6-3
Table 6-5