Animation demonstrates the working principles and characteristics of various tower equipment---packed extraction tower.

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Extraction column (English name extraction column), also known as extraction tower, is a liquid-liquid mass transfer equipment commonly used in chemical industry, petroleum refining, environmental protection and other industrial sectors. Liquid-liquid extraction is a method of mass transfer. One or several compound components in a mixture solution are extracted with another liquid (called a solvent, which is immiscible with the solvent of the mixture solution), so that it can be separated, enriched, and purified. This process is called extraction, extraction, liquid-liquid extraction, solvent extraction process. The equipment used is called an extractor. There are single and multiple extractions, and there are gap and continuous extraction processes. The extractor used for continuous multiple extractions is a tower type equipment, called an extraction tower. Its internal structure uses gravity or mechanical action to break a liquid into droplets and disperse them in another continuous liquid for liquid-liquid extraction. Performance characteristics: There are many types of extraction equipment, and the packed extraction tower is one of the most widely used extraction equipment. It not only has the advantages of simple structure and easy manufacturing and installation, but also due to the development of new scraping packing, the processing capacity of the packed extraction tower has been greatly improved, and the mass transfer efficiency has been improved; therefore, the research and application of packed extraction towers have been rapidly developed in recent years. However, in the sub-liquid-liquid extraction process, the density difference between the two phases is small, the viscosity of the continuous phase is large, the axial back-mixing of the two phases is serious, and the interface phenomena are complex. There are many factors that influence the extraction process, many of which are not fully understood. Most of the available data are measured in small-bar experimental setups, which are typically only a few inches in diameter and a few feet tall. Therefore, the obtained relationship can only be used as a rough estimate, and sufficient room should be left in the design." Compared with gas-liquid mass transfer processes such as distillation and absorption, the design of packed extraction towers has some different characteristics.