Determine by the Kremser method the separation that can be achieved for the absorption operation indicated in Figure for the following combinations of conditions:

(a) Six equilibrium stages and 75 psia operating pressure,

(b) Three equilibrium stages and 150 psia operating pressure,

(c) Six equilibrium stages and 150 psia operating pressure. At 90°F and 75 psia, the K-value of nC10 =0.0011.

Lean gas 90 F Ibmol/h 10 500 Absorber 90 F Ibmol/h C, 1,660 C2 C nC5 Rich oil 168 96 52 24 2,000