Dynamic cocurrent and countercurrent extraction device

Abstract

A dynamic cocurrent and countercurrent extraction device belongs to the technical field of extraction equipment and comprises a cocurrent extraction tank, a countercurrent extraction tank and a transition extraction tank, a first stirring shaft is arranged in the down-flow extraction tank, a spiral stirring propelling blade is arranged on the first stirring shaft, the outer end of the first stirring shaft is externally connected with a first stepping motor, and an extracting solution outlet is formed in the tank wall of the inner end of the down-flow extraction tank; a second stirring shaft is arranged in the countercurrent extraction tank, a spiral stirring push-out blade is arranged on the second stirring shaft, the outer end of the countercurrent extraction tank is externally connected with a second stepping motor, a slag outlet and a solvent injection port are formed in the tank wall of the outer end of the countercurrent extraction tank, and the transition extraction tank is communicated with the downstream extraction tank and the countercurrent extraction tank; the device has the beneficial effects that the flowing direction of a solvent is opposite to the entering direction of materials, so that the solvent is in full contact with medicinal materials, the extraction efficiency is improved, the extraction period is shortened, and the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to an extraction device, in particular to a dynamic co-current and counter-current extraction device. Background Art

[0002] Solvent extraction is an important operation in the production process of traditional Chinese medicine. Its process method, process flow selection and equipment configuration will directly affect the quality and clinical effect of traditional Chinese medicine. At present, traditional Chinese medicine extraction methods mostly use decoction, maceration and percolation, but there are many shortcomings. For example, the decoction method has low extraction efficiency, large amount of solvent and long extraction time; the maceration method has too long extraction time and low solvent utilization; the percolation method requires a large amount of solvent and complex equipment.

[0003] For example, the more popular single-tank extraction is to introduce the Chinese medicine and the corresponding solvent into the extraction tank, and heat and stir. In order to improve the extraction rate of Chinese medicine, 1-2 additional solvents are generally added for re-extraction after the first extraction. The extraction device is generally a vertical extraction tank with mechanical stirring, and the Chinese medicinal materials are fed from the upper feed port; the slag discharge door is at the bottom of the tank body, and the filter plate covers the slag discharge door, and rotates synchronously with the slag discharge door to open or close. This extraction process has the problems of insufficient contact between the solvent and the medicinal materials, incomplete extraction of the medicinal materials, and a long extraction cycle, resulting in low production efficiency; and the extract is directly output from the lower end of the device, which may cause mud or some impurities to enter the storage tank with the extract, resulting in unclean extract. In general, the extraction method has problems such as low extraction efficiency, large solvent consumption, and long extraction time. Therefore, it is necessary to develop an efficient extraction device. Summary of the invention

[0004] The purpose of the present invention is to provide a dynamic co-current and counter-current extraction device, which can effectively improve the extraction efficiency, reduce energy consumption and reduce solvent consumption.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is a dynamic co-current and countercurrent extraction device, including a co-current extraction tank, a countercurrent extraction tank, a transition extraction tank, a solvent injection pipe, a solvent bridge pipe and an extract collecting pipe, wherein a first stirring shaft is provided in the co-current extraction tank, and a spiral stirring propulsion blade is provided on the first stirring shaft, and a rotating shaft stabilizing frame is respectively provided at the outer end and the inner end of the co-current extraction tank, and the two ends of the first stirring shaft are installed on the rotating shaft stabilizing frame, and the outer end of the first stirring shaft passes through the outer end tank wall of the co-current extraction tank and is externally connected to a first stepper motor, a feed port is provided at a position on the outer end tank wall of the co-current extraction tank, and a bridge pipe inlet is provided at another position on the outer end tank wall of the co-current extraction tank, the liquid outlet end of the solvent bridge pipe is connected to the bridge pipe inlet, and an extract outlet is provided on the inner end tank wall of the co-current extraction tank. The collecting pipe is connected to the liquid outlet of the extract; a second stirring shaft is provided in the countercurrent extraction tank, and a spiral stirring and pushing blade is provided on the second stirring shaft. A rotating shaft stabilizing frame is respectively provided at the outer end and the inner end of the countercurrent extraction tank, and both ends of the second stirring shaft are installed on the rotating shaft stabilizing frame. The outer end of the second stirring shaft passes through the outer end tank wall of the countercurrent extraction tank and is externally connected to a second stepping motor. A slag outlet is provided at a position on the outer end tank wall of the countercurrent extraction tank, and a solvent injection port is provided at another position on the outer end tank wall of the countercurrent extraction tank, and the solvent injection pipe is connected to the solvent injection port; the head end of the transition extraction tank is directly connected to the inner end of the downstream extraction tank, and the tail end of the transition extraction tank is directly connected to the inner end of the countercurrent extraction tank. A bridge pipe outlet is provided on the tank wall at the head end of the transition extraction tank, and the liquid inlet end of the solvent bridge pipe is connected to the bridge pipe outlet.

[0006] Furthermore, the solvent injection pipe is provided with an injection pump, the solvent bridge pipe is provided with a bridge pump, and the extraction liquid collection pipe is provided with an extraction pump.

[0007] Furthermore, a solvent heating device is provided, and the solvent heating device is installed on the solvent injection pipeline between the solvent raw material tank and the injection pump.

[0008] Furthermore, the stepper motor is a forward and reverse stepper motor. When the material needs to be pushed forward, the stepper motor is adjusted to always rotate in the forward direction. When the material needs to be stirred, the stepper motor is adjusted to intermittent forward and reverse rotation.

[0009] Furthermore, the downstream extraction tank, the upstream extraction tank and the transition extraction tank are in the shape of circular tubes.

[0010] Furthermore, the downstream extraction tank and the countercurrent extraction tank are installed horizontally, and the transition extraction tank is installed vertically.

[0011] Furthermore, the circular tubular tank body of the transition extraction tank is semicircular, one end of which is connected to the downstream extraction tank, and the other end of which is connected to the upstream extraction tank.

[0012] Furthermore, the feed inlet is arranged on the upper tank wall of the outer end of the downstream extraction tank, and the bridge pipe inlet is arranged on the lower tank wall of the outer end of the downstream extraction tank.

[0013] Furthermore, the slag outlet is arranged on the tank wall below the outer end of the countercurrent extraction tank, and the solvent injection port is arranged on the tank wall below the outer end of the countercurrent extraction tank.

[0014] When in use, the material is put into the feed port of the downstream extraction tank, and the first stepper motor is turned on at the same time to rotate the first stirring shaft so that the spiral stirring propulsion blade pushes the material from the outer end to the inner end of the downstream extraction tank, and the material passes through the gap in the rotating shaft stabilizing frame into the transition extraction tank, and then enters the countercurrent extraction tank, and the second stepper motor is turned on and the second stirring shaft is rotated so that the spiral stirring propulsion blade pushes the material from the inner end to the outer end of the countercurrent extraction tank; while the material is put in, the solvent tank is turned on to make the solvent flow into the solvent heating device for heating; after the material fills the downstream extraction tank, the transition extraction tank and the countercurrent extraction tank, the slag outlet on the countercurrent extraction tank is closed at this time, and then the valve on the solvent injection pipe is opened, and the injection pump is turned on to inject the heated solvent into the countercurrent extraction tank and the transition extraction tank, so that the solvent is fully immersed in the material to form a countercurrent extraction; and then the bridge is opened The pump pumps the solvent that has been immersed and extracted in the countercurrent extraction tank and the transition extraction tank into the solvent bridge pipe through the bridge pipe outlet, and injects it into the downstream extraction tank through the bridge pipe inlet, until the downstream extraction tank is filled and the solvent is fully immersed in the material in the downstream extraction tank, thus forming a downstream extraction; then the valve on the extract collection pipe is opened, the extraction pump is opened, and the solvent that has been immersed and extracted in the downstream extraction tank is pumped out to obtain the material extract; then the extract is filtered and purified; in this process, the pumping speed of the solvent is adjusted according to the setting, and the pumping speed is made the same, and the extraction time of the material in the entire tank body is set. At the end of the extraction, the valves on the injection pump and the solvent injection pipe are closed, and the extraction pump is used to completely extract the flowable liquid in the tank body, and then the gate on the slag outlet is opened to take out the material residue, and put it into the squeezer for drying and recovering the solvent.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: three directly connected extraction tanks are provided, and the inlet and outlet positions of the material are opposite to the inlet and outlet positions of the solvent, so that the flow direction of the solvent can be opposite to the entry direction of the material, and the solvent injected from the solvent injection port can be fully in contact with the medicinal materials in the extraction tank, and the extraction yield can be improved by the slow flow of the solvent, shortening the entire extraction cycle and improving production efficiency; the bottom-in and top-out extraction method can also effectively reduce the impurities extracted with the extract, thereby achieving the effect of effective impurity removal and improving the solvent recovery rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the dynamic co-current and counter-current extraction device of the present invention.

[0017] In the figure: 1. downstream extraction tank, 2. countercurrent extraction tank, 3. transition extraction tank, 4. solvent injection pipe, 5. solvent bridge pipe, 6. extract collection pipe, 7. first stirring shaft, 8. spiral stirring propulsion blade, 9. rotating shaft stabilizing frame, 10. first stepper motor, 11. feed inlet, 12. bridge pipe inlet, 13. extract outlet, 14. second stirring shaft, 15. spiral stirring push blade, 16. second stepper motor, 17. slag outlet, 18. solvent injection inlet, 19. bridge pipe outlet, 20. injection pump, 21. bridge pump, 22. extraction pump, 23. solvent heating device. DETAILED DESCRIPTION

[0018] The present invention will be further described below in conjunction with examples. The following examples are intended to illustrate the present invention rather than to further limit the present invention, and should not be used to limit the protection scope of the present invention.

[0019] like Figure 1As shown, a dynamic co-current and countercurrent extraction device is manufactured, which includes a co-current extraction tank 1, a countercurrent extraction tank 2, a transition extraction tank 3, a solvent injection pipe 4, a solvent bridge pipe 5 and an extract collection pipe 6. The co-current extraction tank 1 is provided with a first stirring shaft 7, and the first stirring shaft 7 is provided with a spiral stirring propulsion blade 8. The outer end and the inner end of the co-current extraction tank 1 are each provided with a rotating shaft stabilizing frame 9, and the two ends of the first stirring shaft 7 are respectively installed on the two rotating shaft stabilizing frames 9. The outer end of the first stirring shaft 7 passes through the outer end tank wall of the co-current extraction tank 1 and is externally connected to a first stepper motor 10. A feed port 11 is provided at a position on the outer end tank wall of the extraction tank 1, a bridge pipe inlet 12 is provided at another position on the outer end tank wall of the downstream extraction tank 1, the liquid outlet end of the solvent bridge pipe 5 is connected to the bridge pipe inlet 12, an extract liquid outlet 13 is provided on the inner end tank wall of the downstream extraction tank 1, and the extract liquid collecting pipe 6 is connected to the extract liquid outlet 13; a second stirring shaft 14 is provided in the countercurrent extraction tank 2, and a spiral stirring and pushing blade 15 is provided on the second stirring shaft 14, and a rotating shaft stabilizing frame 9 is also provided at the outer end and the inner end of the countercurrent extraction tank 2; in this embodiment, the The rotating shaft stabilizing frame 9 includes a bearing, a bearing ring seat and four support rods. The inner ring of the bearing is mounted on the stirring shaft, and the outer ring of the bearing is mounted on the bearing ring seat. The four support rods are evenly distributed in a radial shape and fixedly mounted on the bearing ring seat, and the other ends of the four support rods are fixedly mounted on the inner ring wall of the inner end of the downstream extraction tank 1 or the countercurrent extraction tank 2, that is, there are a lot of gaps between the support rods on the rotating shaft stabilizing frame, so that the material can pass through easily; the two ends of the second stirring shaft 14 are respectively mounted on the two rotating shaft stabilizing frames 9, and the outer end of the second stirring shaft 4 passes through the countercurrent extraction tank 1 or the countercurrent extraction tank 2. Outside the outer end tank wall of the tank 2 and externally connected to a second stepping motor 16, a slag outlet 17 is provided at a position on the outer end tank wall of the countercurrent extraction tank 2, a solvent injection port 18 is provided at another position on the outer end tank wall of the countercurrent extraction tank 1, and the solvent injection pipe 4 is connected to the solvent injection port 18; the head end of the transition extraction tank 3 is directly connected to the inner end of the downstream extraction tank 1, the tail end of the transition extraction tank 3 is directly connected to the inner end of the countercurrent extraction tank 2, a bridge pipe outlet 19 is provided on the tank wall at the head end position of the transition extraction tank 3, and the liquid inlet end of the solvent bridge pipe 5 is connected to the bridge pipe outlet 19.

[0020] The solvent injection pipe 4 is provided with an injection pump 20, the solvent bridge pipe 5 is provided with a bridge pump 21, and the extracting liquid collecting pipe 6 is provided with an extraction pump 22. A solvent heating device 23 is provided on the solvent injection pipe 4 between the injection pump 20 and the solvent raw material tank. The first stepper motor 10 and the second stepper motor 16 are both forward and reverse stepper motors. When the material needs to be pushed forward, the stepper motor is adjusted to always rotate forward. When the material needs to be stirred, the stepper motor is adjusted to intermittent forward and reverse rotation.

[0021] Furthermore, the downstream extraction tank 1, the countercurrent extraction tank 2, and the transition extraction tank 3 are in the shape of circular tubes; the downstream extraction tank 1 and the countercurrent extraction tank 2 are installed horizontally, and the transition extraction tank 3 is installed vertically; the circular tubular tank body of the transition extraction tank 3 is semicircular, one end of which is connected to the downstream extraction tank 1, and the other end is connected to the countercurrent extraction tank 2.

[0022] Furthermore, the feed port 11 is arranged on the upper tank wall of the outer end of the downstream extraction tank 1, and the bridge pipe inlet 12 is arranged on the lower tank wall of the outer end of the downstream extraction tank 1; the slag outlet 17 is arranged on the lower tank wall of the outer end of the countercurrent extraction tank 2, and the solvent injection port 18 is arranged on the lower tank wall of the outer end of the countercurrent extraction tank 2.

[0023] When in use, the medicinal material is put into the feed port 11 of the downstream extraction tank 1, and the first stepper motor 10 is turned on at the same time, and the first stirring shaft 7 is rotated forwardly, so that the spiral stirring propulsion blade 8 pushes the medicinal material from the outer end to the inner end of the downstream extraction tank 1, and the medicinal material passes through the gap in the rotating shaft stabilizing frame 9 into the transition extraction tank 3, and then enters the countercurrent extraction tank 2, and then the second stepper motor 16 is turned on, and the second stirring shaft 14 is rotated forwardly, so that the spiral stirring propulsion blade 15 pushes the medicinal material from the inner end to the outer end of the countercurrent extraction tank 2; When the medicinal material raw materials are put in, the solvent tank is opened to allow the solvent to flow into the solvent heating device 23 for heating; after the medicinal material raw materials fill the downstream extraction tank 1, the transition extraction tank 3 and the countercurrent extraction tank 2, the slag outlet 17 on the countercurrent extraction tank 2 is closed, and then the valve on the solvent injection pipe 4 is opened, and the injection pump 20 is turned on to inject the heated solvent into the countercurrent extraction tank 2 and the transition extraction tank 3, so that the solvent is fully immersed in the medicinal material raw materials, forming a countercurrent extraction; then the bridge pump 21 is turned on to inject the solvent immersed in the countercurrent extraction tank 2 and the transition extraction tank 3. The solvent that has been soaked and extracted is pumped into the solvent bridge pipe 5 through the bridge pipe outlet 19, and is injected into the downstream extraction tank 1 through the bridge pipe inlet 12, until the downstream extraction tank 1 is filled and the solvent is fully immersed in the medicinal material raw material in the downstream extraction tank 1, thus forming a downstream extraction; then the valve on the extract collection pipe 6 is opened, and the extraction pump 22 is turned on to pump out the solvent that has been soaked and extracted in the downstream extraction tank 1, so as to obtain a medicinal material raw material extract; then the extract is filtered and purified; in this process, the pumping speed of the solvent in and out is adjusted according to the setting. , and make the pumping speed the same as the pumping speed, set the extraction time of the medicinal material raw material in the whole tank body according to the setting, during the extraction process, adjust the first stepper motor 10 and the second stepper motor 16 to the intermittent forward rotation and reverse rotation mode, so that the blades on the two stirring shafts are repeatedly stirred, and at the end of the extraction, close the valves on the injection pump 20 and the solvent injection pipe 4, and make the extraction pump completely extract the flowable liquid in the tank body, and then open the gate on the slag outlet 17, take out the medicinal material raw material residue, and put it into the squeezer to dry and recover the solvent. After inspection, the use of this equipment can reduce the extraction time when extracting artemisinin, not only with low energy consumption, but also only 180 minutes to complete a 99% yield, while the existing static extraction method needs to be divided into four times, each time for 60 minutes for extraction, which not only has high energy consumption but also has a yield of only 95%.

Claims

1. A dynamic co-current and counter-current extraction device, characterized in that It comprises a downstream extraction tank, a countercurrent extraction tank, a transition extraction tank, a solvent injection pipe, a solvent bridge pipe and an extract collecting pipe, wherein a first stirring shaft is arranged in the downstream extraction tank, the first stirring shaft is provided with a spiral stirring propulsion blade, a rotating shaft stabilizing frame is respectively arranged at the outer end and the inner end of the downstream extraction tank, the two ends of the first stirring shaft are mounted on the rotating shaft stabilizing frame, the outer end of the first stirring shaft is externally connected to a first stepper motor, a feed port is arranged at a position on the outer end tank wall of the downstream extraction tank, a bridge pipe inlet is arranged at another position on the outer end tank wall of the downstream extraction tank, the liquid outlet end of the solvent bridge pipe is connected to the bridge pipe inlet, an extract outlet is arranged on the inner end tank wall of the downstream extraction tank, and the extract collecting pipe is connected to the extract outlet; the countercurrent extraction tank A second stirring shaft is provided in the extraction tank, and a spiral stirring and pushing blade is provided on the second stirring shaft. A rotating shaft stabilizing frame is respectively provided at the outer end and the inner end of the countercurrent extraction tank, and both ends of the second stirring shaft are mounted on the rotating shaft stabilizing frame. The outer end of the second stirring shaft is externally connected to a second stepping motor. A slag outlet is provided at a position on the outer end tank wall of the countercurrent extraction tank, and a solvent injection port is provided at another position on the outer end tank wall of the countercurrent extraction tank, and the solvent injection pipe is connected to the solvent injection port; the head end of the transition extraction tank is directly connected to the inner end of the downstream extraction tank, and the tail end of the transition extraction tank is directly connected to the inner end of the countercurrent extraction tank, and a bridge pipe outlet is provided on the tank wall at the head end of the transition extraction tank, and the liquid inlet end of the solvent bridge pipe is connected to the bridge pipe outlet.

2. The dynamic co-current and counter-current extraction device according to claim 1, characterized in that The solvent injection pipe is provided with an injection pump, the solvent bridge pipe is provided with a bridge pump, and the extraction liquid collection pipe is provided with an extraction pump.

3. The dynamic co-current and counter-current extraction device according to claim 2 is characterized in that A solvent heating device is also provided, and the solvent heating device is installed on the solvent injection pipeline between the solvent raw material tank and the injection pump.

4. The dynamic co-current and counter-current extraction device according to claim 3 is characterized in that The stepper motor is a forward and reverse stepper motor.

5. The dynamic co-current and counter-current extraction device according to claim 4, characterized in that The downstream extraction tank, the upstream extraction tank and the transition extraction tank are in the shape of circular tubes.

6. The dynamic co-current and counter-current extraction device according to claim 5, characterized in that The downstream extraction tank and the upstream extraction tank are installed horizontally, and the transition extraction tank is installed vertically.

7. The dynamic co-current and counter-current extraction device according to claim 6, characterized in that The cylindrical tank body of the transition extraction tank is semicircular, one end of which is connected to the downstream extraction tank, and the other end of which is connected to the upstream extraction tank.

8. The dynamic co-current and counter-current extraction device according to claim 7, characterized in that The feed inlet is arranged on the upper tank wall of the outer end of the downstream extraction tank, and the bridge pipe inlet is arranged on the lower tank wall of the outer end of the downstream extraction tank.

9. The dynamic co-current and counter-current extraction device according to claim 8, characterized in that The slag outlet is arranged on the tank wall below the outer end of the countercurrent extraction tank, and the solvent injection port is arranged on the tank wall below the outer end of the countercurrent extraction tank.

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