Solid-liquid extraction with solvent regeneration
In solid-liquid extraction or leaching, target substances in a solid raw material are leached by solvents. The process is mainly used for natural product extraction and leaching of ores. A high-efficient and total solid extraction is promoted by high surface areas and short diffusion methods for the solvent.
In a laboratory scale, Soxhlet-extractors are used for a continuous extraction of solids and the determination of the product quality, e.g. for amount of free fatty acids and impurifications.
In pilot scale units, the solid-liquid extraction is combined with a distillation unit to separate the target substance from the solvent.