Absorption Columns: Interactive Simulation
This simulation was prepared using Mathematica. Download the free Wolfram player, and then download the simulation CDF file (link given below or click on figure to download).
In this Demonstration, a trayed absorption column is used to remove an impurity solute (chloroform) from a gas feed by absorbing the impurity in a liquid solvent. The number of trays/stages needed to obtain a desired outlet solute mole ratio in the gas stream is calculated. A stage is a plate that contacts the liquid solvent and the gas to promote mass transfer. The slope of the pink operating line, L/V, is shown on the column on the right. The equilibrium line is orange.
Try to answer these questions before determining the answer with the simulation. We suggest that you write down the reasons for your answers.
- As the temperature increases, how does the slope of the equilibrium line change? How does the slope of the operating line change? How does the number of stage for a given separation change? Why?
- As the pressure increases, how does the slope of the equilibrium line change? How does the slope of the operating line change? How does the number of stage for a given separation change? Why?
