The extraction tank is a leaching extraction equipment commonly used in pharmaceutical chemicals, and is particularly suitable for leaching extraction of components contained in plant products. The extraction tank can be used for water extraction, alcohol extraction, hot reflux extraction, circulation extraction, extraction of volatile oil, recovery of organic solvent in the residue.

The decoction method is a kind of extract from the Chinese medicine extraction tank, which means placing the treated medicine in the extraction tank, adding appropriate amount of water to heat and boil, so that the active ingredient of the medicine is diffused into the water to form a leachate, the leachate is poured out, and then the water is decoctioned. Boil for two or three times and discard the dregs to obtain a leachate from which the active ingredient is extracted.

a. Decoction extraction operation:

(1) The amount of water should be processed in general for about 10% of the medicine.

(2) The temperature of the heating is high at the beginning, and after boiling, the temperature can be lowered to make the liquid slightly boil.

(3) The time of boiling is determined according to the hardness and particle size of the pieces.

For the high hardness and large particle size, the decoction time is slightly longer. Generally, the boiling time is 20~40min after boiling; the number of decoction varies mainly depending on the type of decoction, such as ginseng antler and the like. Some, the number of times is more, in general, you have to fry twice.

b. Note:

1 The medicinal material should be a processed net medicinal material.

2 The amount of water added should be 6-8 times the amount of the medicine.

3 should be heated to boiling before starting to time.

c. Advantages:

1 This method is simple and easy to use, and can cook most of the active ingredients.

2 Especially suitable for medicinal materials whose active ingredients are soluble in water and stable to temperature and heat.

d. Disadvantages:

1 The selectivity to the active ingredient is poor, and there are many impurities, and the refining is difficult.

2 Easy to mold, spoilage, and difficult to preserve.

3 Some heat-labile and volatile components are easily destroyed during the boiling process, and are volatilized and lost.