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A random-packed tower is to be used for contacting 3000 lb/h of air with 4000 lb/h of water. The tower will be packed with l-in. chemical porcelain Raschig rings. The operating pressure is 1 atm, and the temperature is 70°F. Assuming column operation is in the preloading range, estimate the optimum diameter per foot of packed height to give minimum annual cost for fixed charges and blower operating charges. The following additional data apply:
Annual fixed charges = 0.2 times cost of installed unit
Cost of installed unit, complete with distributor plates, supports, and all auxiliaries = 2.0 times purchased cost of shell and packing
Cost of delivered power = $0.08/kWh
Operating time = 8000 h/year
Purchased cost of shell = $40/ft3 of packed volume
Purchased cost of packing = $22.00/ft3
For a reversible liquid phase reaction A-^R, the conversion is 33.3% after 8 minutes and equilibrium conversion is 66.7%. Find the rate equation for the reaction.
Plot the system curve on the pump characteristic given in Figure and determine the operating point and pump efficiency. Properties of the fluid: density 900 kg/m3, viscosity 1.36 mN m-2 s.
Using the data on equipment costs given in this chapter or commercial cost estimating software, estimate the cost of the following equipment:
the path followed by a fixed amount of a perfect gas during a reversible process is described by the following
Calculate the work done in the isothermal reversible expansion of one mole of CH4 (g) from 1.00 dm3 to 10.00 dm3 at 300 K. Treat methane as a van der Waals gas. The van der Waals gas constants for methane are: a=2.3026 dm6⋅bar⋅mol−2 and b=0.043067 dm..
Estimate relative errors in the calculation of free carriers concentration when the Maxwell-Boltzman n statistics is applied for semiconductors with Ferm i energy wi thin the energy gap, if the Fenni level is 3kbT, 2k1,T, k,,T away from the ban..
Compute graphically the flowrate and the pump head at the operation conditions - Repeat the question for the case of two identical pumps in series
Draw another diagram overlaying the Pourbaix diagrams for nickel and silver and use this diagram to explain the likely outcome of holding a solution of nickel ions in a silver container.
Why is it important - where does galvanising fit into possible corrosion protection strategies?)
Hydrogen is manufactured from methane by either steam reforming (reaction with steam) or partial oxidation (reaction with oxygen). Both processes are endothermic. What reactor temperature and pressure would you expect to be optimal for these proce..
Calculate the mass of the metal in gr than can be prepared from 150 grams of aluminum and 250 grams of iron (iii) oxide
One type of commercial smoke detector contains a minute amount of radioactive americium-241 (241Am), which decays by -particle production.
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