Continuous countercurrent extraction method using dynamic overflow and apparatus thereof

Abstract

The invention relates to a method for extracting effective component of traditional Chinese medicine, with dynamic overflow continuous reverse-flow method, wherein said method uses several extractors, while each extractor works independently and they use active overflow method, to transfer liquid continuously. Compared with traditional method, the invention improves extracting speed, reduce solvent consumption, reduce following energy consumption and improve efficiency. The invention can reduce extracting temperature, etc. And the invention comprise several pots, heater, condenser, tubes, pump and value which control the active overflow between pots, and the meter element controlling the balance of whole device.

Description

technical field [0001] The invention relates to an extraction process of effective components of traditional Chinese medicines, in particular to a dynamic overflow continuous countercurrent extraction process of traditional Chinese medicines and a device used therein. Background technique [0002] The existing traditional Chinese medicine extraction process usually uses extraction methods such as decoction, dipping, and heat reflux. Most of them use a single extraction tank for extraction operations. Generally, 2 to 3 extractions are required. The amount of solvent used is as high as 10 times the weight of the medicinal material. The extraction temperature up to the boiling point of the solvent. Mainly there are the following problems: ①Excessive temperature will lead to the excessive cracking and gelatinization of starch and the loss of azeotropic distillation components with solvent in medicinal materials, increase the content of non-effective components, reduce product qu...

AI Technical Summary

Problems solved by technology

The main problems are as follows: ①Excessive temperature will lead to excessive cracking and gelatinization of starch and the loss of azeotropic distillation components in medicinal materials, increasing the content of non-effective components and reducing product quality. It is not suitable for the extraction of heat-sensitive active components.

②A single extraction tank performs multiple intermittent extraction operations and uses a large amount of solvents, not only the production efficiency is low, but also the energy consumption of subsequent concentration is greatly increased. For extraction with organic solvents, the production cost will be greatly increased

③Whether it is decoction, dipping or heat reflux extraction method, the medicinal material and the solvent keep a relatively static state, and the concentration difference of the active ingredient in the medicinal material and the solvent is small when the active ingredient in the medicinal material and the solvent is close to equilibrium, resulting in long extraction time and low extraction rate of the active ingredient. Low cost, waste of precious medicinal resources, according to Chinese patents 93237130.2, 98230191.X, even if repeated decoction 5-8 times, only 50% of the active ingredients can be extracted

In order to improve the extraction rate of active ingredients, it is often used to prolong the extraction time, increase the amount of solvent and increase the extraction temperature, but prolonging the extraction time will affect the production efficiency, and increasing the amount of solvent will increase the production cost

[0003] Chinese patents 95104823.6, 96119720.X, 97247550.8, 98230191.X, 99232171.9, 00219081.8, etc., have introduced extraction techniques and methods such as dynamic, continuous, countercurrent, and ultrasonic waves, which have improved extraction production efficiency and effective ingredient extraction rate to a certain extent, and reduced Production cost, but can not fundamentally further improve the dissolution rate of active ingredients in medicinal materials, reduce the amount of solvent and extraction temperature, the extraction rate of active ingredients is still low, feeding or slag removal is mainly manual, and can not be realized in the true sense. There are many technical problems that are difficult to solve in the implementation process of some technologies and methods, such as the use of organic solvents as extraction solvents, which reduces the safety of the production environment when the fully enclosed extraction operation cannot be realized. The screw type continuous countercurrent extraction is used to shorten the contact time between the material and the solvent, which affects the extraction rate of active ingredients, and the lubricating oil in the mechanical transmission will pollute the extraction solution, etc.

At the same time, the original tank group countercurrent extraction adopts the method of pouring the cans, and the number of times of pouring liquid is large, resulting in a longer overall time. Taking 4 cans as an example: because the pouring of the cans is carried out in sequence, each can needs to wait for the previous can to be poured. , before the next pouring can be carried out. At the end of each extraction, it is necessary to pour the tank 4 times. The time required is the cumulative time of all stages

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