Analysis of the characteristics of modern Chinese medicine extraction and automatic control

How to integrate traditional Chinese medicine with the world medicine is a problem that Chinese medicine industry must solve From the characteristics of traditional Chinese medicine, the extraction and refining of traditional Chinese medicine is the primary problem to be solved The extraction of Chinese medicine is the process of "preserving its essence and removing its dross", and it is also the key to Chinese medicine Traditional Chinese medicine extraction is usually water decocting method, boiling twice, decocting temperature is high, time is long, energy consumption is big, waste is much In order to solve these problems, the dynamic extraction technology of traditional Chinese medicine is a better choice The characteristics of dynamic extraction of traditional Chinese medicine the so-called dynamic extraction of traditional Chinese medicine is to first treat the extracted traditional Chinese medicine to the size of about 0.5-1.0cm, put it into preheated water and soak it for 30min, stir it at 95-98 ℃ and extract it for 1h, centrifugal filtration, slag pressing, combined filtrate and concentration This dynamic extraction process has the following characteristics: ① the specification of medicinal materials is small, the extraction is sufficient, the extraction time is shortened, and the production efficiency is greatly improved ② Under the dynamic condition, the extracted material is heated evenly, the temperature of the material in the tank is the same, and the whole extraction process maintains a constant temperature, which improves the quality of the liquid medicine ③ After multistage separation, high quality extract was obtained, which created good conditions for subsequent concentration, alcohol precipitation and drying ④ The water content of the residue is less than 15% after being pressed by the centrifuge, which is 15% - 20% more than that of the multi-functional extraction tank Therefore, the recovery rate can be improved ⑤ Because there is no need to boil the medicinal materials, the energy consumption is reduced by more than 50% ⑥ The material of the whole production line adopts the pipeline vacuum pumping method, which can avoid the material sticking in the pipeline and meet the GMP requirements ⑦ Advanced technology, full automatic control of the whole process ⑧ It can be used for water extraction, alcohol extraction, multiple extraction, aromatic oil extraction and so on 2 The configuration of dynamic extraction production line generally speaking, the main equipment of the full-automatic control dynamic extraction production line includes: 1 water preheater, 2 dynamic extraction tanks, 1 high-level extraction tank, 1 lower discharge centrifuge, 1 filter, 1 storage tank, 1 overspeed centrifuge, 1 intermediate storage tank, 2 double effect concentrators, 1 concentration tank and 1 clean hot water tank The advantages of dynamic extraction automation there are many advantages of dynamic extraction technology It is very important for the modernization of traditional Chinese medicine industry to realize automatic control This is because the automatic control of traditional Chinese medicine extraction can bring the following advantages: ① increase the output, shorten the production cycle, improve the utilization rate of equipment; ② improve the quality, reduce the human error; ③ reduce the cost, improve the utilization rate of raw materials, energy and equipment, reduce the unqualified products; ④ ensure the safety, make the production process safer; ⑤ increase the flexibility, make the production line safer Better operating environment 4 Layout plan of detection control points of dynamic extraction process 4.1 dynamic water extraction process Temperature control of water preheater, equipped with thermal resistance and steam on-off valve; vacuum feeding control, equipped with real air operated on-off valve and medicine pneumatic on-off valve; extraction tank water adding control, distribution magnetic flowmeter and water pneumatic on-off valve; extraction tank constant temperature timing control, equipped with resistance and steam regulating valve; extraction tank jacket pressure detection alarm, equipped with pressure transmitter; extraction tank frequency conversion control, equipped with transformer Frequency controller; extraction tank discharging control, equipped with discharging pneumatic on-off valve, compressed air pneumatic on-off valve, tuning fork level meter and distillation liquid pneumatic on-off valve 4.2 liquid inlet control of centrifuge in solid separation process, equipped with liquid level transmitter, hydraulic control valve, slag discharge pneumatic on-off valve; filter liquid level control, voice fork level gauge, compressed air pneumatic on-off valve, slag discharge pneumatic on-off valve, discharge pneumatic on-off valve 4.3 double effect concentration process Detection alarm of concentrated liquid storage tank, equipped with liquid level transmitter; detection of liquid phase temperature of primary evaporator with thermal resistance; pressure distribution transmitter and steam regulating valve of primary evaporator; pressure distribution transmitter of primary evaporator: flow control of primary inlet liquid with electromagnetic flowmeter; level detection of primary evaporator with radar liquid level meter; detection of liquid phase temperature of secondary evaporator with thermal resistance; secondary evaporation The pressure control is equipped with pressure transmitter and pneumatic control valve; the pressure detection of the second effect evaporator is equipped with pressure transmitter; the liquid level detection of the second effect evaporator is equipped with radar liquid level gauge and pneumatic liquid level control valve; the density detection of the second effect medicine liquid is equipped with the existing density gauge The dynamic extraction of traditional Chinese medicine is a new and modern extraction technology, which not only does not change the original characteristics of traditional Chinese medicine extraction, but also ensures that the effective components of extracted traditional Chinese medicine remain basically the same Dynamic extraction can save energy, improve the extraction rate, and realize full-automatic control Therefore, it is the development trend of the modernization of extraction technology of traditional Chinese medicine Now, many domestic enterprises have tried, including Jiangxi Jiangzhong Pharmaceutical Co., Ltd and Shandong LVYE Pharmaceutical Co., Ltd to apply fully automatic dynamic extraction to production practice, with good results Since dynamic extraction of traditional Chinese medicine is a new technology, there are also some shortcomings Not all Chinese herbal medicines are suitable for dynamic extraction technology, for example, some Chinese herbal medicines which are rich in starch and easy to gelatinize are not suitable In addition, because the traditional Chinese medicine extraction method is water decoction, its extraction temperature and time are different from dynamic extraction, so when the traditional extraction process is changed to dynamic extraction, the equivalence test of its effective components should be carried out to eliminate the possible quality differences caused by different extraction methods.