Multi-stage semi-continuous extraction process multi-tank reverse
Tank type countercurrent extraction is actually a multi-stage semi-continuous extraction process. Aiming at the shortcomings of conventional extraction methods such as large solvent dosage, high extraction temperature, and low production efficiency, multiple extraction units are reasonably combined to realize the solid-liquid contact mass transfer process simultaneously in multiple leaching units. Through process configuration and adjustment, the concentration layer of each unit is reasonably arranged, and the principle of countercurrent mass transfer is introduced, so that the fresh solvent first enters the extraction unit with the lowest active ingredient content, and moves forward in sequence, thereby shortening the extraction time, reducing the solvent dosage, and maximizing theExtraction of traditional Chinese medicineThe active ingredient in the material.
The characteristics of the multi-tank countercurrent extraction method are as follows:
1. The system is flexible in use, and each extraction unit can be used independently or in combination for continuous countercurrent extraction.
2. Solid-liquid contact of tank group countercurrent extraction is carried out in different extraction units at the same time. Although the raw materials of traditional Chinese medicine do not move between the tanks, the countercurrent operation can still be realized as a whole through process configuration and process adjustment. Each extraction unit obtains an appropriate concentration layer.
3. Under the combined process, the solvent of each extraction unit participates in the extraction process of all extraction tanks, which not only ensures the concentration layer required for mass transfer, but also realizes the application of the solvent, reduces the amount of solvent, greatly reduces the volume of the leaching liquid, and reduces the workload of the subsequent separation and concentration process.
4. The requirements for raw material pretreatment are roughly the same as those for single-stage leaching. Through flexible process configuration and adjustment, better raw material adaptability and operating parameters can be obtained, and the best extraction effect can be obtained. Each operating unit can flexibly adopt suitable leaching processes, such as mechanical mixing, warm dipping, and soaking.
5. Suitable for the upgrading of old factories, appropriate changes in the direction of the pipeline can be achieved.
6. Suitable for large-scale production of traditional Chinese medicine raw materials such as rhizomes, seeds, minerals, and animals.
