The characteristics of the hot reflux extraction and concentration unit are:
1. The rate of removal of the paste is 10 to 15% higher than that of the multi-energy can, and the active ingredient contained in the ointment is more than 1 times higher. In the extraction process, the hot solvent is continuously added to the medicine surface, and the medicinal material layer is passed through from the top to the bottom to dissolve the solute in the medicinal material. The solute content in the medicinal material maintains a high gradient with the solute content in the solvent, and the solute in the medicinal material Dissolved at a high speed until it is completely dissolved, the extraction rate of the active ingredient is high, so the rate of removal of the paste is high, and the content of the active ingredient in the ointment is high.
2. Due to the high-speed dissolution of solute, the extraction time is short, and the concentration and extraction are carried out simultaneously. Therefore, it takes only 7-8 hours for the medicinal material to concentrate the ointment, and the equipment utilization rate is high.
3. The equipment is single, the land occupation is small, and the equipment utilization rate is high, so the investment is saved.
4, extraction only add 1 solvent, recycling in a set of sealed equipment, the solvent in the dregs can be basically recovered, so the solvent dosage is less than 30% less than the multi-energy extraction tank, the consumption rate can be reduced by 50 to 70% This paves the way for the extraction and purification of active ingredients from traditional Chinese medicines with organic solvents.
5. Because the concentrated secondary steam is used as the heat source for extraction, the extract liquid pumped into the concentrator and the concentrated temperature can save more than 50% of the steam, the operation is very simple, and the working principle is reduced:
Put the medicinal material into the extraction tank, and add 5-10 times of the solvent of the medicinal material such as water, ethanol, methanol, acetone, etc. (according to the process requirements). Open the extraction tank straight-through and jacketed steam valve, and then heat the extract to boiling for 20 to 30 minutes, then pump 1/3 of the extract into the concentrator with a suction filter. Close the extraction tank straight through and jacket steam, open the heater valve to concentrate the liquid. When concentrated, secondary steam is generated, which is sent to the extraction tank through the evaporator riser tube for extraction of the heat source and solution to maintain boiling in the extraction tank.
The secondary steam continues to rise, condenses into a hot condensate through the condenser, and falls back into the extraction tank as a new solvent to be added to the drug surface. The new solvent passes through the medicinal material layer from the top to the bottom and flows to the bottom of the extraction tank. The soluble active ingredient in the medicinal material Dissolved in the solvent in the extraction tank. The extract is pumped into the concentrator through the suction filter, and the secondary steam generated by the concentration is sent to the extraction tank as a heat source and a new solvent. The new solvent thus formed is greatly refluxed, so the solute density in the medicinal material and the solute density in the solvent are kept high. Gradient, the solute in the medicinal material is dissolved at high speed until it is completely dissolved (the extract is colorless). At this time, the extract is stopped and pumped into the concentrator, and the concentrated secondary steam is transferred to the cooler, and the concentration is continued until concentration is required (1.2 The ointment of ~1.34) is released and used. The colorless liquid in the extraction tank can be put into the storage tank for reuse in the next batch, and the dregs are drained from the slag gate. If the organic solvent is used for extraction, the appropriate amount of water is first added, and the straight through and the jacketed steam are opened to recover the solvent. , drain the slag.
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