Absorption operations in packed column
A packed column is a cylindrical vessel under pressure, filled with a suitable packing material between the internal section 1 and 2.
The liquid flows down by gravity through the surface of the packing elements forming a thin film layer around it. The gas rises in counter-current mode with the liquid stream.
The mass transfer takes place through the interface film present between the gas and the liquid.
The column is now a continuous differential contacting devices. There is no distinguishable stage (like the plates in a tray column) present anymore.