Points to note when using the hot reflux extraction and concentration unit

When using the hot reflux extraction and concentration unit, consider the following points:

1. **Feed Rate**: Adjust the feed rate according to the unit's specific principle, which differs from the multifunctional extraction tank.

2. **Start Reflux Timing**: Begin reflux after 1 hour of extraction (once the material boils), ensuring some liquid enters the concentration tank. Avoid early reflux to prevent low extract concentration and extended extraction time. Late reflux can saturate the extract, wasting energy and reducing effectiveness.

3. **Temperature Control**: Maintain a reflux liquid temperature that is not too low, while keeping the extraction tank temperature constant. Cold extraction (below 90°C) results in fewer impurities and better clarity but may leach large molecular impurities during boiling.

4. **Extraction Time and Concentration**: Determine the optimal extraction time to balance complete extraction and minimize impurities. Over-extraction increases impurity separation difficulty, while under-extraction wastes raw materials. Regularly check the solution concentration during extraction.

5. **Avoid Residue Build-Up**: Prevent drug formation at the bottom of the reaction tank, which reduces active ingredient extraction and leads to medicinal material waste.