Views:114 Author:Site Editor Publish Time: 2020-05-20 Origin:Site
Extractors are equipment used for extraction operations, generally referring to liquid-liquid extraction equipment. There are stirring extraction tower, pulse extraction tower, spray extraction tower, packing extraction tower, etc.
The mixing and clarifying tank (or mixing clarifier) is the earliest step-by-step contact extraction equipment used by people. The two liquid phases that are not miscible in each stage of the equipment will be stirred and clarified to separate phases to achieve the goal Mass transfer and separation of solutes in different liquid phases.
The mixing clarification tank has the following characteristics: high-level efficiency, strong adaptability, simple amplification, strong operability, large footprint and large material retention.
Although the mixing clarifier appeared earlier, it is still widely used in petroleum, chemical, metallurgy, nuclear industry and other fields, and it is currently the most commonly used extraction equipment. Mixing and clarifying tanks commonly used in industrial production include MSPI (Mixing-settler based on phase inversion) mixing and clarifying tanks, submerged chamber-free mixing and clarifying tanks, double-mixing shallow tanks, Hanson vertical tanks, and micro-mixing clarifiers.
The role of the extraction tower is to achieve mass transfer between the two liquid phases. Its role is to allow the two liquid phases of the extraction system to be fully mixed, intimately contacted, and accompanied by high-intensity turbulence to obtain a high mass transfer efficiency. At the same time, the extraction phase and the raffinate phase are separated well. Common extraction towers include stirred extraction towers, spray extraction towers, packed extraction towers and vibrating plate extraction towers.
The extraction column can be classified according to the two-phase dispersion method and the two-phase contact mode. At the same time, different extraction columns can be selected according to different occasions. The following figure shows the characteristics and application scope of the extraction column.
Typical extraction column structure includes gravity extraction column, mechanically stirred extraction column and pulse extraction column.
The gravity extraction column further includes a spray column, a packing column and a multi-layer sieve plate in a vertical column body, and an arched overflow pipe is installed on one side of each sieve plate. Among them, the spray column is the simplest continuous countercurrent extraction equipment, which is composed of an empty column shell and a two-phase guide and discharge device. The mass transfer efficiency of the packed column is relatively high, followed by its simple structure, low cost, convenient operation, and suitable for processing corrosive fluids.
Mechanically agitated extraction columns include rotary disk extraction columns and Scheibel extraction columns.
The structure of the pulse extraction column is similar to that of a general packing column. Packing is installed in a vertical cylindrical column, and the packing is wetted with the continuous phase before use. The addition of pulse energy in the pulse packing column can cause the pulsation of droplets, which is beneficial to mass transfer. Mass transfer efficiency depends largely on the dispersion of droplets. The average droplet diameter is an important factor in determining column performance.
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