Seminar 6 (Spring-Summer 2019) with solutions.pdf -...

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DEPARTMENT OF CHEMICAL & MATERIALS ENGINEERING ChE 316 Equilibrium Stage Processes Spring-Summer 2019 Seminar 6 (June 26, 2019) 1 Q1. Gas-Liquid System, Absorption An absorber is being employed to absorb CO 2 from air into a dilute-caustic solution. The entering gas containing 3 mol % CO 2 with a flow rate of 792 lbmol/h at 60° F, 1 atm where equilibrium is given as y = 1.75 x (units are in mole fractions). Assume caustic solution has the properties of water. It is desired to recover 97% CO 2 in the liquid outlet stream. The solvent rate is 1.4 times the minimum solvent rate. The equilibrium data can also be found in figure 1. Determine: i) Maximum possible concentration of CO 2 in the caustic solution ii) Minimum caustic solution-to-air molar flow rate ratio iii) Caustic solution rate iv) The number of equilibrium stages required ( both graphically and analytically by Kremser equation ) Q2. Gas-Liquid System, Stripping A stripping column uses air to regenerate a liquid stream containing 1 mol % of a solute. It is expected to remove 98% of this solute. The air stream used for stripping is free of the solute and the equilibrium distribution of the solute in the liquid and the air stream is given by y = 0.1x + 0.01x 2 (y and x are mole fractions of the solute in the gas and liquid phase respectively). The equilibrium data can also be found in figure 2. Answer the following: (a) What is the minimum amount of air stream needed to achieve the necessary separation? (b) If in the real operation, the air flow rate used is 1.5 times more than the minimum amount, what is the number of plates needed for the given operation?

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