Packed Absorption Column - Solving for min water rate and transfer units.

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SUMMARY

The discussion centers on designing a packed absorption column to reduce ammonia concentration in a waste gas stream from 0.045 mole per mole of carrier gas to a maximum of 600 ppm. The inlet ammonia flow rate is specified as 2000 ft³/min at 1 atm and 77°F. The system operates in a counterflow configuration, with the operating slope line set at 33.3% greater than the equilibrium line, defined by the equation y = 0.75x. The objective is to calculate the required water rate and the number of theoretical transfer units for the packed column.

PREREQUISITES
  • Understanding of absorption column design principles
  • Familiarity with mass transfer operations
  • Knowledge of equilibrium line equations in gas-liquid systems
  • Experience with counterflow absorption processes
NEXT STEPS
  • Calculate the water rate required for ammonia absorption in packed columns
  • Determine the number of theoretical transfer units (NTU) for the packed column
  • Explore the impact of varying the operating slope on absorption efficiency
  • Review case studies on packed column design for gas absorption applications
USEFUL FOR

Chemical engineers, process design engineers, and students studying mass transfer operations will benefit from this discussion, particularly those focused on gas absorption and column design methodologies.

stanley.b
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Having much difficulty with the problem below. Any direction would be greatly appreciated.

A waste gas stream contains .045 mole of ammonia per mole of carrier gas. Its desired to design an absorber using water which will reduce the ammonia concentration in the exit gas from the absorber to a max value of 600 ppm. The inlet ammonia flow is 2000 ft^3/min when measured at 1 atm and 77 degrees F. The system is to be counter flow and the operating slope line is to be 33.3 percent greater than the slope of the equilibrium line. Assume the equilibrium line is represented by y = .75x. Determine the water rate required and the number of theoretical transfer units for the packed column.
 
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This is a homework problem, and should have been submitted to the engineering homework forum.
 

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