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Course: Medicinal Plants Technique: Soxhlet Extraction and Rotary Evaporator

Course: Medicinal Plants Technique: Soxhlet Extraction and Rotary Evaporator. Dr. Muhammad Qasim Hayat. Soxhlet Extractor. A piece of laboratory apparatus invented in 1879 by Franz von Soxhlet. Originally designed for the extraction of a lipid from a solid material.

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Course: Medicinal Plants Technique: Soxhlet Extraction and Rotary Evaporator

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  1. Course: Medicinal PlantsTechnique: Soxhlet Extraction and Rotary Evaporator Dr. Muhammad QasimHayat

  2. Soxhlet Extractor • A piece of laboratory apparatusinvented in 1879 by Franz von Soxhlet. • Originally designed for the extraction of a lipid from a solid material. • However, a Soxhlet extractor is not limited to the extraction of lipids. • Typically, a Soxhlet extraction is only required where the desired compound has a limited solubility in a solvent, and the impurity is insoluble in that solvent.

  3. Parts of Soxhlet extractor • Stirrer bar  •  Still pot •  Distillation path  • Thimble • Solid • Siphon top • Siphon exit • Expansion adapter  • Condenser  • Cooling water in • Cooling water out

  4. THE SOXHLET EXTRACTORContinuous extraction of a component from a solid mixture.Boiling solvent vapors rise up through the larger side-arm

  5. Condensed drops of solvent fall into the porous cup, dissolving out the desired component from a solid mixture

  6. When the smaller side-arm fills to overflowing, it initiates a siphoning action.

  7. Residual solvent then drains out of the porous cup, as fresh solvent drops continue to fall into the porous cup.

  8. . . . and the cycle repeats . . .

  9. It should look something like THIS:

  10. The solvent, containing the dissolved component, is siphoned into the boiler below

  11. ROTARY EVAPORATOR

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