ABSTRACT
Extraction is a process where certain substances of a solid or a liquid mixture are dissolved, washed, or leached by the aid of a liquid solvent. The receiving or extract phase consists of the solvent and key substances transferred by the solvent from the feed or rafnate phase. Compared with other separation processes, regeneration of the solvent and purication of the valuable substances are required (Aguilera 2003, Sancey 2002, Sattler and Feidt 1995).
