(1a)

(1b)

(1c)

a) Fill in the blank spaces The purpose of any distillation system is to separate a components. The separation takes place in a distillation mixture into mixture is called or and the components to which it is separated are called or Gas from a petroleum distillation column, has its concentration of H2S reduced from 0.03kmol H2S/kmol of inert hydrocarbon gas to 1 per cent of this value, by scrubbing with a triethanolamine-water solvent in a countercurrent tower, operating at 300K and at atmospheric pressure. H2S is soluble in such a solution and the equilibrium relation may be taken as Y=2X2. where Y is kmol of H2S/kmol inert gas and X is kinol of H2S/kmol of solvent. The solvent enters the tower free of H2S and leaves containing 0.013kmol of H2S/kmol of solvent. If the flow of inert hydrocarbon gas is 0.015kmol/m2 s of tower cross-section and the gas-phase resistance controls the process, calculate: (a) The height of the absorber necessary (b) The number of transfer units required. The overall coefficient for absorption K,a may be taken as 0.04kmol/sm of tower volume cunit driving force in Y ). A mixture of ammonia and air is scrubbed in a packed tower with fresh water. If the ammonia concentration is reduced from 5 mole per cent to 0.01 mole per cent, and the water and air rates are 0.65 and 0.40kg/m2, respectively, how many overall gas phase and liquid phase transfer units are required? The equilibrium relationship may be written as y=x, where y is the mole fraction of ammonia in the vapour in equilibrium with a mole fraction x in the liquid