Select between the use of a flash or an absorption column to recover 80% of the ammonia in a stream consisting of 211, 70.4, 9.12, and 62.1 kmol/s of H2, N2, Ar, and NH3, respectively. The initial temperature and pressure are 400C and 100 bar. For the absorption column, it operates at 100C and 100 bar with a liquid flow twice the minimum and an efficiency of 57% for the stages.

Cost of cooling 1h/kW (cp(kJ/kg K): H2514; N251; Ar50.52;

NH352.2; λ51369 kJ/kg). Recovering ammonia from liquid, 1500h/

(kg/s). Cost of vessels, 25,000h/stage. The flash is 1 stage.