Question

Question 3 [16 Marks ] Flue gas being discharged at 3600 kg/m2h contains 2% by volume of a toxic gas that has to be cleaned by absorption in w ater in a countercurrent packed column. Environmental regulations require that this value be reduced by 99% before discharge into the atmosphere. The clean! ng water flows at 5760 kg/m2h. The molar mass of the gas mixture is approximately equal to that of air and for such a dilute solution, Henrys law applies, ye 1.8x, where y, is the mole fraction of the toxic gas in the vapour in equilibrium with a mole fraction x in the liquid phase. (a) Give a sketch of the system (b) What is the concentration of the toxic gas in the liquid exit stream? (c) How many overall transfer units are required?

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Answer 1

Ls 5160 gnhr a) Sketth- ets ,Ls - mass fouw nah gas and n on toxic gas free baris 2. toxic gas bais Packed Coum wab on toxic gas free banis 2.9 G1s ahlying the matavial balanas squation 93 05125- 0.005)320 XI ItX ito 012 (c) for mula ove aoD trans fer unit 4

Yに0.25 129 t-yt)び 0.0025 :25-0 . 0025 с 12. g b 129-0 00 25 0 2475 In (51.6 012 65