liquid-liquid solvent extraction
Quick Summary
Liquid-liquid solvent extraction is a chemical process used to separate components of a mixture. It involves using two immiscible or partially immiscible solvents. The mixture is dissolved in one solvent, and then brought into contact with the second solvent. The components of the mixture distribute themselves between the two solvents based on their relative affinities. The solvent containing the desired component is called the extract, while the remaining solvent is the raffinate.1
This process can be single-stage, where one equilibration is sufficient for separation if the separation factor is large. However, for components with smaller separation factors, a multistage process is required, where the equilibration is repeated many times to achieve higher purity. This technique is crucial in industries like rare-earth element processing, where it's used to separate individual elements with high purity.21
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- separation and purificationSeparations based on equilibria
…previously cited involved extraction (liquid-liquid). The other methods are described below.
Read More…previously cited involved extraction (liquid-liquid). The other methods are described below.
Read More - separation and purificationSingle-stage versus multistage processes
Consider a liquid-liquid extraction experiment in which the volumes of the two liquid phases (A and B) are equal and in which equal amounts of two components, 1 and 2, are present in one of the phases (say A). If K1 = 0.5 and K2 = 2.5,…
Read MoreConsider a liquid-liquid extraction experiment in which the volumes of the two liquid phases (A and B) are equal and in which equal amounts of two components, 1 and 2, are present in one of the phases (say A). If K1 = 0.5 and K2 = 2.5,…
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rare-earth elementSeparation chemistry…Ridge National Laboratory developed the liquid-liquid solvent extraction method for separating rare earths in the mid-1950s. This method is used by all rare-earth producers to separate mixtures into the individual elements with purities ranging from 95 to 99.9 percent. The ion-exchange process is much slower, but higher purities of more…
Read More…Ridge National Laboratory developed the liquid-liquid solvent extraction method for separating rare earths in the mid-1950s. This method is used by all rare-earth producers to separate mixtures into the individual elements with purities ranging from 95 to 99.9 percent. The ion-exchange process is much slower, but higher purities of more…
Read More- rare-earth elementSolvent extraction
The liquid-liquid solvent extraction process uses two immiscible or partially immiscible solvents containing dissolved rare earths. The two liquids are mixed, the solutes are allowed to distribute between the two phases until equilibrium is established, and then the two liquids are separated. The…
Read MoreThe liquid-liquid solvent extraction process uses two immiscible or partially immiscible solvents containing dissolved rare earths. The two liquids are mixed, the solutes are allowed to distribute between the two phases until equilibrium is established, and then the two liquids are separated. The…
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