PROBLEM: A chemical plant produces an ammonia-rich waste gas that cannot be rele

Question

PROBLEM: A chemical plant produces an ammonia-rich waste gas that cannot be released as-is into the environment. One method to reduce the ammonia concentration in the waste gas is to bubble the waste gas through a liquid solvent Components of the gas that are highly soluble, like ammonia, will dissolve into the liquid phase. Water is an appropriate liquid solvent for this process. The chemical plant produces 115.0 m3/hr of waste gas (rho = 0.0407 mol/L) initially having a mole fraction of 0.190 NH3, and wishes to remove 90.0% of the initial amount of NH3. The maximum concentration of ammonia in water at this temperature is 0.4500 mol NH3/ mol water. Neglect the absorption of other waste gas components into the water, and the evaporation of water into the waste gas stream. What rate is NH3 is being removed from the feed gas? What is the minimum flow rate of water (rho = 0.990 g/mL) required to scrub out 90.0% of the incoming NH3? What is the mole fraction of NH3 in the scrubbed waste gas stream? SOLUTION OVERVIEW: You want to find the rate NH3 is removed from the feed gas, the minimum flow rate of water required to scrub 90.0% of the incoming NH3 from the gas, and the mole fraction of NH3 in the scrubbed gas stream. The first step is to draw and label the process flow diagram. Perform a degrees of freedom analysis to confirm that it is possible to find the process conditions. Convert the volumetric flow rate of the unscrubbed waste gas to a molar flow rate using its density, and find the mole fraction of ammonia in the effluent stream. Write out the mass balance equations for this process. Solve them simultaneously to find quantities requested. Convert the molar flow rate of water into the scrubber into a volumetric flow rate. This tutorial will walk you through the above steps. In future tutorial steps, the original problem statement and above solution overview will be in the hint panel as a reference. What is the shape of the correct flow diagram for this process?

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