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An absorption tower containing wooden grids is to be used for absorbing SO, in a sodium sulfite solution. A mixture of air and SO, will enter the tower at a rate of 70,000 ft3/min, temperature of 250°F, and pressure of 1.1 atm. The concentration of SO2, in the entering gas is specified, and a given fraction of the entering SO, must be removed in the absorption tower. The molecular weight of the entering gas mixture may be assumed to be 29.1. Under the specified design conditions, the number of transfer units necessary varies with the superficial gas velocity as follows:
where Gs is the entering gas velocity as lb/(h)(ft2) based on the cross-sectional area of the empty tower. The height of a transfer unit is constant at 15 ft. The cost for the installed tower is $1 per cubic foot of inside volume, and annual tied charges amount to 20 percent of the initial cost. Variable operating charges for the absorbent, blower power, and pumping power are represented by the following equation:
The unit is to operate 8000 h/year. Determine the height and diameter of the absorption tower at conditions of minimum annual cost.
Develop a mass balance for a continuous diafiltration step and indicate the volumetric flow rates and concentrations of different species in the different streams obtained.
A lime-soda softening plant treats a flow of 150 MGD, and the water has 86mg/l Ca2+, 35 mg/L Mg2+, 299 mg/L HCO3- and 6mg/l CO2. The commercial grade of quicklime has a purity of 85% and the soda ash has a purity of 95%. Determine the pounds of qu..
You have a heat pump that takes in 256 kW of heat and puts out 604 kW of heat. What is the coefficient of performance (C.O.P.) of the system ( express this value as a fraction)?
The product may bemobile or immobile; since the reaction is irreversible, it does not matter. Thisreaction shows the solute's penetration across the film. Write mass balancesfor the solute and the immobile reagent.
When dilute nitric acid was added to a solution of one of the following chemicals, a gas was evolved, This gas turned a drop of limewater, Ca(OH)2, cloudy, due to the formation of a white precipitate. The chemical was
Express the diameters in inches and use inside diameters.
The March 1979 accident at the Three Mile Island nuclear plant occurred due to a series of operator errors and equipment failures, which reduced the flow of cooling water to the reactor core. As a result, the water began to boil and the core reached ..
Steam in a closed system is compressed by reversible isothermal process in a heat bath at 250 °C, starting from an initial pressure of 15 bar. During the process, the steam receives 400 kJ/kg of work. Determine the final state and the amount of he..
From among the following, choose one which is not an exothermic process. 1. Ammonia synthesis 2. Methanol synthesis
question 1a with the help of a labeled drawing discriminate between the first-stage biochemical oxygen demand bod and
task onesummarize at least 4 methods of measuring temperature. only one of these methods may be one that was discussed
Dry ice is placed in the bottom of a capillary tube 6.2 cm long. Air is blown across the top of the tube.
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