100 kg-mol/hr of a SO2/air mixture containing 45 mole% SO2, and 55 mole% air is
ID: 736109 • Letter: 1
Question
100 kg-mol/hr of a SO2/air mixture containing 45 mole% SO2, and 55 mole% air is contacted with liquid water in a continuous absorber. You analyze the liquid leaving the absorber and find that it contains 2 grams of SO2 per 100 grams of water. The outlet gas stream from the absorber has been calculated to contain 4.2 mole% water and 23.1 mole% SO2, and the rest air.(The MW of air is 29.) (a) How much water (in kg/hr) is required to operate this separation? (b) What percentage of the SO2 entering the absorber leaves in the exiting liquid stream?Explanation / Answer
A. The initial reaction (1) consumes sodium hydroxide and produces both hydrogen gas and an aluminate byproduct. Upon reaching its saturation limit, the aluminate compound decomposes (2) into sodium hydroxide and a crystalline precipitate of aluminum hydroxide. This process is similar to the reactions inside an aluminium battery. (1) Al + 3 H2O + NaOH ? NaAl(OH)4 + 1.5 H2 (2) NaAl(OH)4 ? NaOH + Al(OH)3 Overall: Al + 3 H2O ? Al(OH)3 + 1.5 H2 B. 42 %
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