Chemical Engineering Question In ammonia plant traces of argon and methane are a

Question

Chemical Engineering Question In ammonia plant traces of argon and methane are absorbed from a nitrogen stream using liquid ammonia. Operation is at 253.2 K and 175.0 atm pressure. Feed flow rate of gas containing 0.024 mol% argon and 0.129 mol% methane is 100.0 kmol/h. We remove 95.0% of the methane. Entering liquid ammonia is pure. Operate with, l/V = 1.4(L/V)_min. Total gas and liquid rates are constant. Equilibrium data at 253.2 K are. Methane: partial pressure methane atm = 3600.0 times (methane mole fraction in liquid). Argon: partial pressure argon atm = 7700.0 times (argon mole fraction in liquid) (Alexandrina et al., 1972). Find the outlet methane mole fraction in the gas. h. Find (L/V)_min and actual L/V. Find the outlet methane mole fraction in the liquid. Find the number of equilibrium stages required. Find the outlet argon mole fractions in liquid and gas. and the percentage of recovery of argon in liquid.

Explanation / Answer

Mole fraction of Argon in gas

=0.024 /0.024 +0.129

0.024/0.153

=0.1568

Rounding off gives 0.16 mole fraction in gas

Total pressure ,P =175 atm pressure

Partial pressure of Ar= P * x (mole fraction )

=175 *0.16

=28 atm

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