Difference between revisions of "Extraction"

In Liquid-liquid extraction two immiscible phases are utilised to separate a desired compound from one phase into the other which is determined by the chemical properties of the compound (the solute) and the chosen solvents. One example for such process is the extraction of organic substances from an aqueous phase into an organic phase. For that the two (organic and aqueous) liquids are mixed to enable substance transfer followed by separating the two liqiuids. The two steps can take place in separate reactors. The solvent has to be chosen in a way that impurities does not dissolve  or only dissolve very limited.  

In solvent-liquid extractions the desired compound is dissolved in an extracting solvent. Thereby the solvent has to be chosen in a way that impurities does not dissolve or only dissolve very limited. The solvent is heated within a reactor utilising the reflux technique. The reflux process  includes the steps of dissolution, heating/distillation, condensation, and  collection which increases its concentration after each cycle.