Deep oxidation preparation equipment for edible theabrownin
By designing a reaction vessel with a venturi tube and damping plate structure, the problem of insufficient contact between oxygen and tea polyphenols was solved, achieving efficient extraction of theaflavins and reducing production costs.
Patent Information
- Application Number
- CN202423008227.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-06
- Publication Date
- 2025-10-24
- Estimated Expiration
- 2034-12-06
AI Technical Summary
In the current process of producing theabrownin, the contact between oxygen and tea polyphenols is insufficient, resulting in a slow and uneven oxidation reaction, and the use of high-purity oxygen increases costs.
The reaction vessel design employs a Venturi tube and damping plate structure. The solution is mixed with air through a suction pipe and a return pipe. The Venturi effect is used to achieve a tight combination of air and tea polyphenols, and the damping plate extends the contact time to improve the oxidation reaction efficiency.
This method achieves rapid and thorough oxidation, increases the yield of theaflavins, improves production efficiency, and reduces costs.
Smart Images
Figure CN223464812U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a kind of mechanical devices, i.e. BACKGROUND
[0002] Theaflavins are the main components of tea health function, and have good preventive and rehabilitation effects on hyperlipidemia, hypertension, angina pectoris, gout, fatty liver, obesity, diabetes, cardiovascular and cerebrovascular diseases, and tumors, etc. Studies have shown that theaflavins are the products formed by the oxidation and polymerization of tea polyphenols in tea. In the existing process of theaflavins preparation, tea polyphenols are first dissolved in water to form an aqueous solution in a reaction tank, and then the aqueous solution is heated and input with oxygen. After a period of time, the various components of tea polyphenols can be converted into theaflavins. Obviously, this process requires sufficient contact between oxygen and tea polyphenols. However, since the specific gravity of oxygen is much smaller than that of water, oxygen is always above water and is not easy to combine with water. Therefore, the oxidation reaction mainly occurs on the surface of the solution, and the oxygen content inside the solution is very low, resulting in slow and uneven oxidation process and poor effect. In order to solve this problem, two methods are currently used: one is to stir to increase the contact opportunity between water and oxygen; and the other is to use high-purity oxygen to obtain stronger reaction effect within the contact time with the solution.
[0003] Experiments have shown that the combination of solution and oxygen during stirring is very uneven, and the reaction is not easy to complete. In addition, continuous high-intensity stirring destroys the stability of the solution, which is not conducive to the oxidation and polymerization reaction. Moreover, the use of high-purity oxygen increases the cost and limits the production and application of the product. SUMMARY
[0004] The utility model aims to provide a kind of edible theaflavins deep oxidation preparation equipment that can make oxygen and tea polyphenols fully combine, oxidation and polymerization reaction is fast and thorough, and the structure is simple, and the cost is low.
[0005] The above-mentioned purpose is realized by the following technical scheme: a kind of edible theaflavins deep oxidation preparation equipment is provided, which includes a reaction tank that can hold tea polyphenol aqueous solution, characterized in that: the reaction tank is provided with a water suction pipe and a water return pipe, the inner ends of the water suction pipe and the water return pipe are in the reaction tank, the outer end of the water suction pipe is connected to the water inlet of a venturi tube, and the outer end of the water return pipe is connected to the water outlet of the venturi tube.
[0006] The water inlet of the venturi tube has a large-diameter pipe, the lower end of the large-diameter pipe is connected to the large end of a conical reducing pipe, the small end of the reducing pipe is opposite to the air inlet of the venturi tube on the outside, the small end of the reducing pipe is opposite to the large end of a conical mixing pipe, the small end of the mixing pipe is connected to the small end of a conical expansion pipe, the large end of the expansion pipe is connected to the water outlet of the venturi tube, and the water outlet is connected to the water return pipe.
[0007] The inner end of the water suction pipe is in the middle of the reaction tank, and the inner end of the water return pipe is in the lower part of the reaction tank.
[0008] The reaction tank is internally provided with multiple damping plates.
[0009] The damping plate is a flat closed plate surface, the outer peripheral edge of which is connected to the inner wall of the reaction tank, and a water passage is formed near one side edge of the plate surface, and the water passage positions of adjacent two damping plates are staggered or opposite.
[0010] The damping plate is a flat plate surface, the outer peripheral edge of which is connected to the inner wall of the reaction tank, and multiple small water permeable holes are arranged on the plate.
[0011] The beneficial effect of the utility model is that the solution in the reaction tank is extracted by the water suction pipe, is accelerated by the variable diameter in the venturi pipe, and simultaneously inhales ambient air, the solution and the air are forced to mix, and then are sent back to the reaction tank, the oxygen in the air is in close contact with the tea polyphenol, the oxidation reaction is more sufficient and rapid, the yield and production efficiency of the thearubigin are greatly improved, the product cost is greatly reduced, and the utility model can be expected to become the preferred equipment for thearubigin production. BRIEF DESCRIPTION OF DRAWINGS
[0012] Figure 1 is the front view of the first embodiment;
[0013] Figure 2 is the structural view of the component venturi pipe of the first embodiment;
[0014] Figure 3 is the front view of the second embodiment;
[0015] Figure 4 is the front view of the component damping plate of the second embodiment;
[0016] Figure 5 is the top view of the component damping plate of the second embodiment;
[0017] Figure 6 is the front view of the component damping plate of the third embodiment;
[0018] Figure 7 is the top view of the component damping plate of the third embodiment.
[0019] It can be seen from the drawing that: the reaction tank 1, the venturi pipe 2, the water inlet 2-1, the large diameter pipe 2-2, the variable diameter pipe 2-3, the air inlet 2-4, the mixing pipe 2-5, the expansion pipe 2-6, the water outlet 2-7, the water suction pipe 3, the water suction pump 4, the water return pipe 5, the one-way valve 6, the damping plate 7, the water passage 8, and the water permeable hole 9. DETAILED DESCRIPTION
[0020] The first embodiment is: Figure 1A kind of equipment for preparing tea polyphenol by deep oxidation is introduced. The main body of the equipment is a reaction tank for containing tea polyphenol solution. Of course, a smaller hydrolysis tank can be used to hydrolyze tea polyphenol first, and then the prepared tea polyphenol solution is sent to the larger reaction tank for oxidation polymerization reaction. The structure of the reaction tank can be various, and one of them is shown in the figure. As shown in the figure, the tank body of the reaction tank is preferably provided with a sandwich, and the sandwich is punched into steam through the gas inlet pipe and the gas outlet pipe to control the temperature in the tank. The upper end of the tank body is provided with a gland, and the gland is provided with a safety valve and a feeding port. The lower end of the tank body is provided with a discharge port. Since the reaction tank is a conventional equipment, it will not be described in detail here. Different from the ordinary reaction tank, the reaction tank 1 is provided with a water suction pipe 3 and a water return pipe 5. The inner ends of the water suction pipe and the water return pipe are both in the reaction tank. A venturi tube 2 is arranged outside the reaction tank, the outer end of the water suction pipe is connected to the water inlet 2-1 of the venturi tube 2, and the outer end of the water return pipe is connected to the water outlet 2-7 of the venturi tube.
[0021] As known in the art, the venturi tube is a common device, although its structure is various, but its structural principle is that the inner diameter of the tube is gradually reduced, the fluid enters from the large diameter end and flows out from the small diameter end. Since the amount of inflow and outflow is equal, the flow rate of the fluid at the outflow end must be accelerated, and the pressure is increased, thereby causing a local vacuum around, and the fluid outside is sucked in and forced to mix with the fluid in the tube.
[0022] In combination Figure 2 As can be seen, the water inlet 2-1 of the venturi tube used in this example is a large-diameter pipe 2-2 with a larger diameter, the lower end of the large-diameter pipe is connected to a tapered variable-diameter pipe 2-3, the large end of the variable-diameter pipe is connected to the lower end of the large-diameter pipe, and the small end of the variable-diameter pipe is opposite to the large end of a conical mixing pipe 2-5, but not connected. The small end of the mixing pipe is connected to the small end of a conical expansion pipe 2-6, and the large end of the expansion pipe is connected to the water outlet 2-7 of the venturi tube. The water outlet is connected to the water return pipe 5, and the water return pipe enters the reaction tank. The outer side of the variable-diameter pipe is opposite to the air inlet 2-4 of the venturi tube, and the air inlet is communicated with the ambient air. Of course, the air should be clean air treated by artificial treatment. Generally, the natural air can be treated by using filtering device, ultraviolet disinfection device, etc. to reach the sanitary standard. For food professional workshop, the air entering has reached the standard, which can be used directly.
[0023] Further, the inner ends of the water suction pipe 3 and the water return pipe of the reaction tank are both in the reaction tank, but the position of the water suction pipe is higher than that of the water return pipe. As shown in the figure, the inner end of the water suction pipe is arranged at the middle upper part of the reaction tank, and the inner end of the water return pipe 5 is arranged at the lower part of the reaction tank.
[0024] The specific use steps of the equipment are as follows:
[0025] 1, Select tea polyphenols raw materials, according to the national standard "GB / T 31740.2-2015" (part 2), select tea polyphenols. Tea polyphenols contain catechin content ≥80%.
[0026] 2, add water process, first in the jacketed hydrolysis tank 5-10 times the water, heating, in the stirring tea polyphenols into solution. Then the solution is transported to the reaction tank, heating and keeping 50-95 ℃, air oxidation polymerization reaction.
[0027] 3, start water suction pump 4, through the water suction pipe solution in the reaction tank, into the water inlet of the venturi, the solution down path from big to small, in the small end of the flow rate increases, the outlet pressure is higher than the surrounding air pressure and form a local vacuum, the air outside the venturi by the air inlet into the tube, with the tube solution convergence. Subsequently, the combined fluid into the mixing tube of the large end of the small end, the flow rate and pressure further increase, the mixing is more fully. Finally, through the tapered expansion tube to the water outlet, and then through the backwater pipe into the reaction tank.
[0028] 4, the color of the solution in the reaction tank gradually dark, eventually become black brown theabrownin material liquid, the theabrownin material liquid dehydration drying, the theabrownin is prepared. The extracted theabrownin product and tea polyphenols raw material quality ratio ≥85%.
[0029] Experiments show that the effect of the above technical solutions is very significant. Through the action of the venturi, the air and tea polyphenol solution are combined closely. Through the venturi into the reaction tank, the fluid is affected by the force of the air and the solution will continue to combine. After a period of time, although the gas will produce the tendency of separation from the solution. However, due to the low position of the backwater pipe, the solution entering the tank needs to run up to supplement the space in the upper part, so it will still travel with the air for a period of time. As can be seen, after the mixing effect of the venturi, the contact time of air and tea polyphenol solution is greatly prolonged, and the effect of oxidation reaction is also enhanced. In addition to air instead of oxygen, the cost is lower. According to the oxygen content of 21% in the air, compared with oxygen with a purity of more than 90%, the theoretical amount of air should be 5 times that of oxygen. However, the actual use is only about 3 times that of oxygen. Only this one, can save a lot of spending.
[0030] Furthermore, in the prior art, oxygen needs to be stirred after entering the reaction tank in order to combine with the solution. This disrupts the order in which the solution and oxygen come into contact through stirring, failing to achieve the sequential combination of solution and air within the Venturi tube. To achieve optimal stirring results, the intensity of the stirring must be increased. This not only consumes a large amount of electricity, but also creates an unstable solution, hindering the reaction and significantly prolonging the reaction time. In contrast, the suction pump in this device consumes less power, and the interaction between the solution and air primarily occurs within the Venturi tube. This results in a relatively stable solution within the reaction tank, optimizing the reaction conditions.
[0031] The second embodiment: Figure 3 As shown, the main body of this device is similar to the first embodiment, with its main components also being a reaction tank 1 and a venturi tube 2. The reaction tank's suction pipe 3 is connected to the venturi tube's water inlet 2-1, and the return pipe is connected to the venturi tube's water outlet 2-7. The venturi tube structure includes a water inlet 2-1, a large-diameter pipe 2-2, a reducing pipe 2-3, an air inlet 2-4, a mixing pipe 2-5, an expansion pipe 2-6, and a water outlet 2-7. To prevent solution from entering the return pipe when the suction pump is shut down, a one-way valve 6 is installed on the return pipe. There are many different types of one-way valves, but the figure illustrates only a simple one. A baffle is hinged on the opening of the return pipe. When liquid in the return pipe flows into the tank, the baffle opens. When liquid in the tank flows into the return pipe, the baffle is impacted by the liquid and closes, preventing the solution in the tank from entering the return pipe.
[0032] In addition, the most important improvement of this example is that a multi-layer damping plate 7 is installed in the reaction tank.
[0033] Combine Figure 4 、 Figure 5 As can be seen, the damping plate is a flat, sealed plate with its outer edge connected to the inner wall of the reactor tank. A water inlet 8 is provided near the edge of the plate. The water inlets of two adjacent damping plates should be staggered, preferably opposite. "Opposite" means a 180° difference. In practice, this does not necessarily have to be 180°, but should be at least 120°.
[0034] At the start of operation, the tea polyphenol solution can enter the reaction tank through the water inlets of the layers of damping plates. After the water suction pump is started, the mixed solution passes through the venturi tube and enters the lower part of the reaction tank through the return pipe. With the damping plate blocking it, the entering mixed solution cannot move upward on its own. Instead, it can only move parallel to one side, then flow upward from the water inlet on one side and enter the bottom of the damping plate on the upper layer. Similarly, the mixed solution entering the upper layer must also move horizontally to the other side before flowing upward from the water inlet of the higher damping plate. In this way, the mixed solution repeatedly turns back and forth, significantly extending the time it takes for air and tea polyphenol solution to combine. At the same time, the impact of the mixed solution entering the tank on the liquid in the tank is cushioned. Although the liquid in the tank has some tumbling, its stability is still very good, which is conducive to the progress of the oxidative polymerization reaction.
[0035] According to actual production statistics, the above technical solution can further improve the yield of theabrownin. The following is a set of actual production data:
[0036] Take 50kg of tea polyphenols raw material and add 400kg of water to a 500L jacketed tank. Start steam heating in the jacket to raise the water temperature to 50-60°C. Stirring is initiated, and the tea polyphenols are slowly added to dissolve into a phenolic compound solution. The solution is pumped to a 1000L reaction tank, where it is heated through the jacket to maintain a temperature of 50-95°C. Clean air is then fed into the oxidative polymerization reactor through a feed pipe. Simultaneously, a water suction pump is activated to pump the solution into a venturi, which then delivers it to the bottom of the reactor. Maintain an air flow rate of 5m³ / h, and allow the oxidative polymerization reaction to proceed for 4-6 hours. When the color of the solution deepens from light yellow, dark yellow, brownish red, reddish brown, and finally dark brown, it becomes the theabrownin feed solution and the oxidative polymerization reaction is complete. Then, the water suction pump and the jacket heat source were turned off, and the discharge port pipe at the bottom of the reaction tank was connected to the feed pipe of the spray drying tower. The liquid passed through the filter device while hot and entered the spray drying tower. All the theabrownin liquid was sprayed in hot air at 150℃-180℃. A total of 47kg of theabrownin product dry powder was collected, with a product yield of 94%.
[0037] The third embodiment: Based on the above embodiment, the structure of the damping plate is improved. Figure 6 、 Figure 7 As shown, the damping plate 7 is a flat plate surface, the outer edge of which is connected to the inner wall of the reaction tank. The plate is provided with a plurality of tiny water-permeable holes 9. The diameter of these water-permeable holes is very small, which can allow the solution to pass through slowly, thereby reducing the speed of the mixed solution rising and enhancing the stability of the liquid in the reaction tank.
Claims
1. A device for preparing tea polyphenol deep-oxidation, comprising a reaction tank capable of containing a tea polyphenol aqueous solution, characterized in that: The reaction tank (1) is provided with a water suction pipe (3) and a water return pipe (5), the inner ends of the water suction pipe and the water return pipe are in the reaction tank, the outer end of the water suction pipe is connected with the water inlet (2-1) of the venturi pipe (2), and the outer end of the water return pipe is connected with the water outlet (2-7) of the venturi pipe. 2. The equipment for the production of edible theasinensin by advanced oxidation according to claim 1, characterized by the fact that: The water inlet (2-1) of the venturi pipe (2) is provided with a large-diameter pipe (2-2), the lower end of the large-diameter pipe is connected with the large end of a tapered variable-diameter pipe (2-3), the outer side of the small end of the variable-diameter pipe is opposite to the air inlet (2-4) of the venturi pipe (2), the small end of the variable-diameter pipe (2-3) is opposite to the large end of a conical mixing pipe (2-5), the small end of the mixing pipe (2-5) is connected with the small end of a conical expansion pipe (2-6), the large end of the expansion pipe (2-6) is connected with the water outlet (2-7) of the venturi pipe (2), and the water outlet (2-7) is connected with the water return pipe.
3. The equipment for the production of edible theabrowns by their intensive oxidation according to claim 1, characterized by the fact that: The inner end of the water suction pipe (3) is in the middle part of the reaction tank (1), and the inner end of the water return pipe is in the lower part of the reaction tank (1).
4. The equipment for the production of edible theasinensin by advanced oxidation according to claim 1, characterized by the fact that: The reaction tank (1) is provided with a plurality of damping plates (7).
5. The equipment for the production of edible theabrowns by their intensive oxidation according to claim 4, characterized by the fact that: The damping plate (7) is a flat closed plate surface, the outer peripheral edge of the plate surface is connected with the inner wall of the reaction tank (1), a water passage (8) is formed in the plate surface close to one side edge, and the positions of the water passages (8) of adjacent two damping plates (7) are staggered or opposite.
6. The equipment for the production of edible theabrowns by their intensive oxidation according to claim 4, characterized by the fact that: The damping plate (7) is a flat plate surface, the outer peripheral edge of the plate surface is connected with the inner wall of the reaction tank (1), and a plurality of small water permeable holes (9) are arranged on the damping plate (7).