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Problem 2 (20 pts) Acetone vapor in air is to be cleaned using pure water as the absorbent liquid. The process will operate at 20C and 1 atm. Two different designs will be tested, a trayed tower that operates at equilibrium conditions and a packed tower where local mass transport coefficients have been measured. Equilibrium data indicate that at 20C and latm y=2x (where y and x are mole fractions of acetone in the air and water, respectively). The feed stream is 2 mol% of acetone and can be considered very dilute. The feed flow rate is 120 kmolhr. The exiting gas needs to have less than 0.1% acetone so use this value as the exiting stream of the gas. Using the assumption that the system is very dilute, calculate the minimum flowrate of pure water needed to remove 95% of the acetone from the air (10p). If you use a water flow rate that is 1.5 times the minimum, calculate the number of equilibrium stages needed to accomplish the required separation. (10p) Problem 2 (20 pts) Acetone vapor in air is to be cleaned using pure water as the absorbent liquid. The process will operate at 20C and 1 atm. Two different designs will be tested, a trayed tower that operates at equilibrium conditions and a packed tower where local mass transport coefficients have been measured. Equilibrium data indicate that at 20C and latm y=2x (where y and x are mole fractions of acetone in the air and water, respectively). The feed stream is 2 mol% of acetone and can be considered very dilute. The feed flow rate is 120 kmolhr. The exiting gas needs to have less than 0.1% acetone so use this value as the exiting stream of the gas. Using the assumption that the system is very dilute, calculate the minimum flowrate of pure water needed to remove 95% of the acetone from the air (10p). If you use a water flow rate that is 1.5 times the minimum, calculate the number of equilibrium stages needed to accomplish the required separation. (10p)