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The tower is a process equipment with a cylindrical welded structure, consisting of a cylinder, a head (or cover) and a support. It is a non-standard equipment specially designed and manufactured for a certain production process requirement. The tower is an upright equipment used for chemical unit operations such as distillation, purification, absorption, and rectification. It is widely used for mass transfer and heat transfer between gas-liquid and liquid-liquid phases. According to the internal structure of the tower, the tower can be divided into plate tower and packed tower. If the inside of the container only contains materials without chemical reactions and other physical and chemical processes, there are no facilities or only simple auxiliary structures, also known as tanks. The container is divided into two types: vertical (the axis is vertical) and horizontal (the axis is horizontal). Most of the towers are pressure vessels.
Equipment for material transfer between gas phase and liquid phase or between liquid phase and liquid phase. According to the structure, it is divided into two categories: plate tower and packed tower. A certain number of trays are arranged in the plate tower, and the gas contacts the liquid layer on the trays in the form of bubbling or spraying for material transfer. The packed tower is equipped with a certain height of packing, the liquid flows from top to bottom along the packing, and the gas comes into countercurrent contact with the liquid film from bottom to top to carry out material transfer. It is often used in distillation, water absorption, extraction and other operations.