Liquid-liquid extraction is an important separation technology for a wide range of applications in the chemical process industries (CPI). Unlike distillation, which is based on boiling point differences, extraction separates components based on their relative solubilities in two immiscible liquids. Extraction is typically chosen over distillation for separation applications that would not be cost-effective, or even possible, with distillation.
Centrifugal extractor is a new type of liquid-liquid extraction and separation equipment, with fast and efficient advantages, it has essential difference in principle with traditional extraction equipments such as mixer settler, extraction column and so on. Centrifugal extractor adopt motor to drive the drum with high-speed rotation, under the shear force generated by drum or blade rotation condition, two different density and immiscible liquids complete mixing and mass transfer, and separated rapidly under the centrifugal force action which generated by high-speed rotation of drum.
Mixing and mass transfer process
Light and heavy phases of solution enter in the internal mixing zone of shell from two feed inlets separately in a certain ratio, mixed and separated rapidly, to complete mixing and mass transfer process.
Separation process
Under the action of the feeder or turbine disc, the mixed liquor enter in drum, in the cavity formed by web, it soon rotated with drum synchronously, under the condition of centrifugal force, during the upward flow process, the heavier liquid flow away from the drum center and towards to the drum wall, while the lighter liquid flow away from the drum wall and towards to the drum center, clarified liquids enter in collecting chamber through their respective weirs and discharged from light and heavy phase outlets, to complete separation process.
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