1. I
y, molar
x, molar
T1
T2
T3
T4
Operating Line Equilibrium Line
y1
x1
x*1,y*1
Isothermal Gas Absorption
If usedfor non-isothermal case, the number of stages
estimatedwill be less than needed. Here, T3 is chosen
as the average temperature. Only two stages are needed,
according to this approach.
x, molar
T1
T2
T3
T4
Operating Line
Equilibrium Line
y1
x1
x*1,y*1
Non-Isothermal Gas Absorption
Either the temperatures must be known for each stage or
estimated.
y, molar
y, molar
x, molar
T1
T2
T3
T4
Operating Line 1
Equilibrium Line 1
Non-Isothermal Gas Absorption with Rinse Stream
Adding a secondstream, usually one containing a strong concentration of acid
andat an elevatedtemperature complicates the calculation by requiring two
operating lines anda "broken" equilibrium line. Additional stages are probably
required.
Operating Line 2 Equilibrium Line 2
L G
L
GL