Solid-liquid extraction techniques
Table of Contents
In practice, the methods listed below with their advantages and disadvantages are mainly used for solid-liquid extraction. Other processes such as ultrasonic extraction or extraction with supercritical fluids play a subordinate role or are only used for special applications.
| Technology | Advantages | Disadvantages |
|---|---|---|
| Soxhlett | The classic procedure and therefore widely used simple inexpensive well established and recognized | High solvent consumption long extraction times of several hours extraction at boiling point No agitation |
| Pressure extraction with classic heating | Higher temperatures than boiling point possible Shorter extraction times Lower solvent consumption | High equipment costs Complicated filling of extraction cells Sequential sample processing No stirring |
| Pressure extraction with microwave heating | Higher temperatures than boiling point possible Shorter extraction times Lower solvent consumption Stirring possible Parallelised,16 samples per run Moderate equipment costs Easy handling |
Special safety precautions required for working with organic solvents Non-polar solvents require special heating elements for microwave absorption |