Plant extract crystallization device

Abstract

The utility model provides a plant extract crystallization device, and belongs to the technical field of plant extract processing. Comprising a crystallizing tank, a stirring assembly and an air blowing assembly which are arranged on the crystallizing tank, and a discharging pipe arranged below the crystallizing tank, the stirring assembly comprises a stirring plate arranged in the crystallizing tank, and a plurality of liquid outlet holes are formed in the stirring plate; the air blowing assembly comprises an annular air pipe which is arranged in the crystallizing tank and can move vertically, a plurality of air outlets are formed in the annular air pipe, and the air outlet ends of the multiple air outlets face the stirring plate and the inner wall of the crystallizing tank one by one; the limiting air blowing assembly comprises an annular air pipe capable of moving in the vertical direction, and a plurality of air outlets are formed in the annular air pipe, so that residual crystals on a crystallizing tank and a stirring assembly can be quickly blown off by air in the vertical moving process of the annular air pipe; the stirring assembly is limited to be the stirring plate, the structure is simple, the surface is smooth, dead angles are few, and residual crystals on the surface of the stirring assembly can be rapidly blown off.

Description

Technical Field

[0001] The utility model relates to the technical field of plant extract processing, in particular to a plant extract crystallization device. Background Art

[0002] Betulin, also known as betulin, betulin, and betulin, is a pentacyclic triterpenoid compound widely distributed in a variety of plants, especially in birch bark with the highest content (10-30%, calculated on a dry basis).

[0003] In the prior art, a patent with application number CN202110794259.8 discloses a method for preparing betulin, which uses birch bark as raw material, and obtains crude extract I by ethanol reflux extraction; crude extract I is removed from impurities with ethyl acetate to obtain crude extract II; crude extract II is dissolved in a chloroform / methanol mixed reagent with a volume ratio of 3:1, decolorized by a neutral alumina column, concentrated and crystallized, dissolved in methanol for recrystallization, filtered, and dried to obtain betulin.

[0004] During recrystallization, anhydrous methanol is added to the concentrated filtrate with precipitated white crystals to stir and dissolve, and then the crystallization is carried out by natural cooling and filtration. However, during the natural cooling, crystallization and filtration process, a small amount of crystals will adhere to the stirring shaft and the inner wall of the crystallization tank. If these crystals are not processed, the collection rate of the product will be seriously affected. Utility Model Content

[0005] The utility model aims to provide a plant extract crystallization device, which can effectively reduce the residual crystals in the crystallization tank and thus improve the crystal collection rate.

[0006] The purpose of this utility model is achieved through the following technical solutions:

[0007] A plant extract crystallization device comprises a crystallization tank, a stirring assembly and a blowing assembly arranged on the crystallization tank, and a discharge pipe arranged below the crystallization tank; the stirring assembly comprises a stirring plate arranged in the crystallization tank, and a plurality of liquid outlet holes are arranged on the stirring plate; the blowing assembly comprises an annular air duct arranged in the crystallization tank and capable of vertical displacement, and a plurality of air outlets are arranged on the annular air duct, and the air outlet ends of the plurality of air outlets are respectively oriented toward the stirring plate and the inner wall of the crystallization tank.

[0008] Preferably, the top wall and the bottom wall of the stirring plate are inclined.

[0009] Preferably, the liquid outlet is in the shape of a truncated cone.

[0010] Preferably, the bottom wall of the crystallization tank is arranged to be inclined downward along the direction of the discharge pipe.

[0011] Preferably, the annular air duct is also provided with a plurality of air outlets inclined along the direction of the discharge pipe.

[0012] Preferably, the crystallization device further comprises a hydraulic rod arranged on the inner top wall of the crystallization tank, and the telescopic end of the hydraulic rod is connected to the annular air duct.

[0013] Preferably, a filter box is provided at the bottom end of the discharge pipe, and a filter screen is provided inside the filter box.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] By setting a blowing assembly, gas can be blown into the crystallizer, and then the crystallizer is purged, effectively reducing the residual crystals in the crystallizer; by limiting the blowing assembly to include an annular air duct that can be displaced in the vertical direction, and arranging multiple air outlets on the annular air duct, one by one, facing the stirring assembly and the air outlet of the inner wall of the crystallizer, the annular air duct can reduce the horizontal distance between the air outlet and the inner wall of the crystallizer and the stirring assembly during the up and down movement of the annular air duct in the crystallizer, and then the gas can be evenly blown to the inner wall of the crystallizer and the stirring assembly as the annular air duct moves, so as to quickly blow off the residual crystals on the crystallizer and the stirring assembly, and improve the collection rate of the crystals; by limiting the stirring assembly to a stirring plate, and piercing multiple liquid outlet holes on the stirring plate, this setting can ensure that the stirring plate has a simple structure, a smooth surface, and fewer dead angles, and can quickly blow off the residual crystals on its surface during the gas purging process. In the prior art, a relatively complex stirring assembly such as multiple stirring rods is arranged, and there is a certain obstruction between the stirring rods, and there are many dead angles, which is not convenient for purging. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model in the front view direction;

[0017] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model in the top view direction;

[0018] Figure 3 It is a schematic diagram of the cross-sectional structure of the stirring plate in the utility model when viewed from above;

[0019] In the figure: 100 - crystallization tank, 110 - discharge pipe, 120 - stirring plate, 130 - liquid outlet, 140 - annular air duct, 190 - hydraulic rod, 200 - filter box, 210 - filter screen, 220 - motor, 230 - air inlet pipe. DETAILED DESCRIPTION

[0020] Below in conjunction with the attached Figures 1 to 3, the technical solutions in the embodiments of the utility model are clearly and completely described, but the protection scope of the utility model is not limited to the following.

[0021] Example 1

[0022] A plant extract crystallization device, such as Figure 1 and Figure 2 As shown, it includes a crystallizer 100, a stirring assembly and a blowing assembly arranged on the crystallizer 100, and a discharge pipe 110 arranged below the crystallizer 100, and the discharge pipe 110 is provided with a valve; the stirring assembly includes a stirring plate 120 arranged in the crystallizer 100, and a plurality of liquid outlet holes 130 are provided on the stirring plate 120; the blowing assembly includes an annular air duct 140 arranged in the crystallizer 100 and capable of vertical displacement, and the annular air duct 140 is provided with a plurality of air outlets, and the air outlet ends of the plurality of air outlets are one by one toward the stirring plate 120 and the inner wall of the crystallizer 100, that is, the outer wall and the inner wall of the annular air duct 140 are provided with a plurality of air outlets (prior art, not shown in the figure). Furthermore, the blowing assembly also includes an air inlet pipe 230 (a telescopic pipe that can be retracted to the shortest state when not in use to avoid affecting the stirring operation) connected to the annular air duct 140, a storage tank connected to the air inlet end of the air inlet pipe 230, and an air pump disposed on the storage tank and connected to the air inlet end of the air inlet pipe 230 (the storage tank and the air pump are both existing technologies and are not shown in the figure); the gas stored in the storage tank is liquid nitrogen or compressed rare gas, etc. Further, as Figure 1 and Figure 2 As shown, the stirring assembly further includes a rotating shaft disposed at the center of the top end of the stirring plate 120, and a motor 220 disposed at the top end of the crystallization tank 100 and connected to the top end of the rotating shaft. A feeding pipe with a valve is disposed on the top wall of the crystallization tank 100. Further, as Figure 1 As shown, a filter box 200 is provided at the bottom end of the discharge pipe 110, a filter screen 210 is provided inside the filter box 200, and an exhaust hole (not shown in the figure) is provided in the filter box 200. In addition, in actual implementation, in order to increase the filtering speed, a vacuum pump can be provided on the filter box 200 to achieve the purpose of suction filtration. Furthermore, the filter screen 210 is slidably provided in the filter box 200, and the side wall of the filter box 200 is provided with a box door (not shown in the figure) for facilitating the removal and placement of the filter screen 210.

[0023] Working principle: the concentrated filtrate to be recrystallized and anhydrous methanol are added into the crystallizer 100 through the feed pipe, and then the motor 220 is turned on. Under the action of the motor 220, the rotating shaft and the stirring plate 120 are rotated synchronously, and then the material in the crystallizer 100 is stirred. After it is fully dissolved, it is crystallized by natural cooling. After the crystallization is sufficient, the valve of the discharge pipe 110 is opened to discharge the material along the discharge pipe 110 to the filter box 200 at the discharge end of the discharge pipe 110 for filtration. After the filtration is completed, the crystals are collected. During the natural cooling, crystallization and filtration process, a small amount of crystals will adhere to the stirring shaft and the inner wall of the crystallizer 100. At this time, turn on the air pump to allow the gas in the storage tank to enter the annular air duct 140 along the air inlet pipe 230, and then blow toward the inner wall of the crystallizer 100 and the stirring plate 120 along the air outlet of the annular air duct 140. During this process, the annular air duct 140 is moved up and down to blow off the residual material on the inner wall of the crystallizer 100 and the stirring rod to the greatest extent, and then discharged from the discharge port to the filter screen 210 to improve the crystal collection rate.

[0024] Further, such as Figure 1 and Figure 2 As shown, the top wall and the bottom wall of the stirring plate 120 are inclined. In this solution, by limiting the top wall and the bottom wall of the stirring plate 120 to be inclined, when the gas is blown horizontally toward the top wall and the bottom wall of the stirring plate 120, the gas can directly collide with the top wall and the bottom wall of the stirring plate 120, thereby improving the purge efficiency.

[0025] Further, such as Figure 3 As shown, the liquid outlet hole 130 is in a truncated cone shape. By setting the truncated cone shape, when the gas is blown horizontally toward the liquid outlet hole 130, the gas can directly collide with the inner wall of the liquid outlet hole 130, thereby improving the purging efficiency. If the liquid outlet hole 130 is not limited to a truncated cone shape, but is still set to a cylindrical shape, when the gas is blown horizontally toward the liquid outlet hole 130, the gas is parallel to the inner wall of the cylindrical shape, so that the gas will not collide with the inner wall of the liquid outlet hole 130, the purging power is reduced, and the purging efficiency is reduced.

[0026] Further, such as Figure 1 As shown, the bottom wall of the crystallizer 100 is arranged to be inclined downward along the direction of the discharge pipe 110. In this solution, by limiting the bottom wall of the crystallizer 100 to be arranged to be inclined, it is convenient for the material therein to be discharged into the discharge pipe 110 along the inclined surface.

[0027] Furthermore, the annular air duct 140 is also provided with a plurality of air outlets inclined along the direction of the discharge pipe 110. In this solution, by providing a plurality of inclined air outlets, when the annular air duct 140 moves down to the lower part of the crystallization tank 100, the crystals remaining on the inclined bottom wall can be blown into the discharge pipe 110 to reduce the crystals remaining on the bottom wall.

[0028] Further, such as Figure 1 and Figure 2 As shown, the crystallization device further includes a hydraulic rod 190 disposed on the top wall of the crystallization tank 100, and the telescopic end of the hydraulic rod 190 is connected to the annular air duct 140. In this solution, by providing the hydraulic rod 190, it is convenient to drive the annular air duct 140 to move in the vertical direction, thereby improving the convenience of operation.

[0029] It is worth noting that, although the present invention only takes the crystallization of betulin as an example, the present invention is not only applicable to the crystallization of betulin, but it is reasonable to say that any plant extract that needs to be recrystallized can be applicable.

[0030] In the description of this patent, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "longitudinal", "horizontal" and the like indicate the directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing this patent and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation of this patent.

Claims

1. A plant extract crystallization device, characterized in that: The invention comprises a crystallization tank (100), a stirring assembly and a blowing assembly arranged on the crystallization tank (100), and a discharge pipe (110) arranged below the crystallization tank (100); the stirring assembly comprises a stirring plate (120) arranged in the crystallization tank (100), and a plurality of liquid outlet holes (130) are arranged on the stirring plate (120); the blowing assembly comprises an annular air duct (140) arranged in the crystallization tank (100) and capable of vertical displacement, and a plurality of air outlets are arranged on the annular air duct (140), and the air outlet ends of the plurality of air outlets (150) are oriented one by one toward the stirring plate (120) and the inner wall of the crystallization tank (100).

2. A plant extract crystallization device according to claim 1, characterized in that: The top wall and the bottom wall of the stirring plate (120) are arranged inclined.

3. A plant extract crystallization device according to claim 2, characterized in that: The liquid outlet hole (130) is in the shape of a truncated cone.

4. A plant extract crystallization device according to claim 1, characterized in that: The bottom wall of the crystallization tank (100) is arranged to be inclined downward along the direction of the discharge pipe (110).

5. A plant extract crystallization device according to claim 4, characterized in that: The annular air duct (140) is also provided with a plurality of air outlets inclined along the direction of the discharge pipe (110).

6. A plant extract crystallization device according to claim 1, characterized in that: It also includes a hydraulic rod (190) arranged on the inner top wall of the crystallization tank (100), and the telescopic end of the hydraulic rod (190) is connected to the annular air duct (140).

7. A plant extract crystallization device according to claim 1, characterized in that: A filter box (200) is provided at the bottom end of the discharge pipe (110), and a filter screen (210) is provided inside the filter box (200).

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