Filling Tower: A gas-liquid mass transfer equipment of the differential contact type. The tower uses packing as the basic element for gas-liquid contact and mass transfer. The liquid in
The packing surface flows in a film-like manner from top to bottom, while the gas phase flows continuously from bottom to top against the liquid, and there is counter-current flow between the gas and liquid phases.
Mass and heat transfer. The concentrations or temperatures of the two phases vary continuously along the tower height.

Typical packed tower components include: the tower body, packing and supports, liquid distributors and redistributors, demisters, etc.