There is a net transfer of one or more soluble species from one liquid into another liquid phase, generally from aqueous to organic, and the drive to make that happen solvent extraction method pdf from chemical potential . In that case, a soluble compound is separated from an insoluble compound or a complex matrix. From a hydrometallurgical perspective, solvent extraction is exclusively used in separation and purification of uranium and plutonium, zirconium and hafnium, separation of cobalt and nickel, separation and purification of rare earth elements etc. We obtain high purity single metal streams on ‘stripping’ out the metal value from the ‘loaded’ organic.
Stripping is the opposite of extraction, transfer of mass from organic to aqueous phase. It is among the most common initial separation techniques, though some difficulties result in extracting out closely related functional groups. Instead, water is reduced to hydrogen. Unsourced material may be challenged and removed. In solvent extraction, a distribution ratio is often quoted as a measure of how well-extracted a species is. Depending on the system, the distribution ratio can be a function of temperature, the concentration of chemical species in the system, and a large number of other parameters.