The tower equipment through its internal components to gas (steam) - liquid and liquid - liquid phase between the full contact

For mass transfer and heat transfer. Unit operations performed by tower equipment are usually rectification

Absorption, desorption, extraction, etc., can also be used for medium cooling, gas purification and drying

And humidification. Tower equipment according to the operating pressure is divided into: pressure tower, pressurized tower; according to the production unit points

As: absorption tower, distillation tower, extraction tower, drying tower, washing tower; according to the tower's internal structure is divided into:

Plate tower, packing tower