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contact equilibrium and gas adsorption

From the case of a rather more difficult taint to remove in which the equilibrium concentration of the taint in the steam is only 4 times as great as that in the cream. If the relative flow rates of cream and steam are given in the ratio 1: 1.5, how many contact stages would be required to reduce the taint concentration in the cream to 1 ppm assuming (a) 100 % stage efficiency and (b) 50% stage efficiency? The initial concentration of the taint is 20 ppm. 

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