Differential extraction - Purification of organic compounds

This technique is employed for the separation of an organic compound that solid or liquid from its aqueous solution by shaking along with a appropriate solvent (for example ether, benzene, chloroform, carbon tetrachloride etc.) in a separating funnel. The chosen solvent must be immiscible with water but must dissolve the organic compound to an substantial extent.

It is significant to note that extraction is more efficient (that is more complete) while a given volume of the extracting solvent is employed in several installments.This method is generally applied to nonvolatile compounds. For instance, benzoic acid can be extracted from its water solution by using benzene.