# Assignment on Mass Transfer Coefficient Determination PPT

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ASSIGNMENT ON MASS TRANSFER COEFFICIENT DETERMINATION Problem 1: Wetted Wall Column β  Air-ammonia mixture containing 4% NH3 by volume is being absorbed counter currently with H2SO4 in a wetted wall column of 20 mm diameter and a length of 1 m. The gas enters the column at a rate of 0.25 kmol/hr. The column has a temperature of 25Β°C and a pressure of 101.325 kN/m2. 85 % of the of the entering NH3 is absorbed. Estimate kG. Ammonia-air H2SO4 Solution y1 = 0.04 (mole fraction of NH3) 0.04 πππ ππ»3 π1 = = 0.04167 1 β 0.04 πππ πππ πππ ππ»3 π2 = 0.04167 0.15 = 0.00625 πππ πππ π¦2 = Rate of air entering = 0.000625 = 0.00621 1.000625 0.25 ππππ 1 βπ ππππ Γ Γ 1 β 0.04 = 6.667 Γ 10β5 βπ 3600 π  π  Solution πππ‘π ππ ππ»3 πππ πππππ, πΈ = 6.667 Γ = 2.36 Γ 10β6 10β5 ππππ πππ π  πππ ππ»3 0.04167 β 0.00625 πππ πππ ππππ ππ»3 π  ππ π2 ππ = 101.325 0.00621 = 0.629 2 π ππ΄1 = 101.325 0.04 = 4.053 ππ΄2 πππ = 4.053 β 0.629 ππ = 1.838 2 4.053 π ππ 0.629 Solution πΈ ππΊ = π΄ β πππ 20 π΄ = ππ·πΏ = π π 1000 1m = 0.0628 π2 Substituting, 2.36 Γ 10β6 ππππ β5 ππΊ = = 2.04459 Γ 10 0.0628 β 1.838 π  β π2 β ππ ...
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