d) Gas mixture containing H;S and air from a petroleum distillation column, has its concentration of...

 

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d) Gas mixture containing H;S and air from a petroleum distillation column, has its concentration of H;S reduced from 4.0 mol % to 0.1 mol % by scrubbing with a triethanolamine-water solvent in a counter-current tower, operating at 300 K and at atmospheric pressure. H;S is soluble in such a solution and the equilibrium relation may be taken as Y. = 2.2X. The solvent enters the tower free of H;S and leaves containing 0.015 kmol of H,S/kmol of solvent. The overall coefficient for absorption K,a may be taken as 0.05 kmol'sm' of tower volume (unit driving force in Y). If the flow of inert air is 0.75 kg/m's of tower cross-section and assuming that the H;S and air solution is not dilute, calculate i) the height of the absorber necessary ii) the height of transfer units required. iii) Write down the physical significance of height of transfer units d) Gas mixture containing H;S and air from a petroleum distillation column, has its concentration of H;S reduced from 4.0 mol % to 0.1 mol % by scrubbing with a triethanolamine-water solvent in a counter-current tower, operating at 300 K and at atmospheric pressure. H;S is soluble in such a solution and the equilibrium relation may be taken as Y. = 2.2X. The solvent enters the tower free of H;S and leaves containing 0.015 kmol of H,S/kmol of solvent. The overall coefficient for absorption K,a may be taken as 0.05 kmol'sm' of tower volume (unit driving force in Y). If the flow of inert air is 0.75 kg/m's of tower cross-section and assuming that the H;S and air solution is not dilute, calculate i) the height of the absorber necessary ii) the height of transfer units required. iii) Write down the physical significance of height of transfer units