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Question: Methylene chloride, a solvent used in the photographic and drug industries, is a major pollutant and a potent carcinogen. Accordingly, there is currently a national effort aimed at finding substitutes for this solvent. Failing this, there is interest in designing packed towers using excess dry air to strip this solvent out of water and feed the resulting vapor stream to an incinerator. The problem is that the methylene chloride is to be stripped under conditions where large quantities of water evaporate simultaneously. In other words, the mass transfer of the methylene chloride may be altered by the mass transfer of the water.
(a) Present equations giving the water flux under these conditions. Use these to calculate the diffusion-induced convection.
(b) Show how this convection alters the flux of methylene chloride, even though the methylene chloride is dilute.
(c) To make this quantitative, assume the maximum water concentration in the vapor is half the total concentration and that both mass transfer coefficients are equal. What is the change in methylene chloride flux?
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