Degassing and homogenizing device for glycerol triacetate

Abstract

The utility model provides a degassing and homogenizing device for glycerol triacetate, and relates to the technical field of additives for cigarettes. The utility model aims at fully mixing glycerol, acetic acid and other raw materials before reaction and degassing glycerol triacetate after reaction so as to improve the production efficiency and quality of the product. The device comprises raw material homogenizing treatment equipment, esterification reaction equipment and finished product degassing treatment equipment, the raw material homogenizing treatment equipment and the finished product degassing treatment equipment are respectively arranged at the front end and the rear end of the esterification reaction equipment, the raw material homogenizing treatment equipment is communicated with the inlet end of the esterification reaction equipment through a conveying pipeline, and the finished product degassing treatment equipment is communicated with the outlet end of the esterification reaction equipment through a conveying pipeline; the homogenizing equipment disclosed by the utility model can effectively promote the mixing uniformity of raw materials such as glycerol and acetic acid, improve the esterification reaction degree and reaction efficiency and shorten the reaction time; and the degassing treatment can effectively improve the transparency and purity of the product.

Description

Technical Field

[0001] This application relates to the field of tobacco additive technology, specifically to a visually color-changing filter rod based on self-assembled ordered microporous spherical activated carbon particles. Background Technology

[0002] Triacetin is a colorless and odorless oily liquid at room temperature and pressure. It does not contain gas, but a small amount of gas may be present inside it under certain specific conditions.

[0003] Air, nitrogen, and oxygen mixed in with the raw materials used to prepare triacetin will enter the triacetin production process along with the raw materials. Triacetin is usually produced by the esterification reaction of glycerol and acetic acid under the action of a catalyst. Water is generated during the reaction, and under certain conditions, the water will vaporize into water vapor. Under high temperature conditions, a small amount of water vapor will be mixed into the triacetin product. In addition, during the reaction, due to the volatility of acetic acid, especially under heating conditions, acetic acid molecules will escape from the reaction system to form acetic acid vapor, which exists in the triacetin. These gases have a significant impact on the production of triacetin. The properties and uses of triacetin are affected in many ways. When gases are dissolved in triacetin, the density of the system changes; the presence of gases interferes with the intermolecular forces of triacetin, leading to a decrease in its viscosity; it alters the overall volatility of triacetin; oxygen, being an oxidizing agent, can trigger the oxidation reaction of triacetin, causing it to decompose or deteriorate and reducing its stability; gases dissolved in triacetin can interact with catalysts or reactants, thereby changing the reaction rate and selectivity, and also affecting the reactivity of triacetin.

[0004] In the tobacco industry, triacetin is commonly used as a plasticizer to improve the flexibility and stability of cigarette filters. However, excessive gas content can lead to the formation of air bubbles during filter production, affecting the filter's texture and appearance, and reducing its quality and filtration efficiency. Furthermore, the presence of gas can also affect the penetration and distribution of triacetin within the filter material, thus impacting its plasticizing effect and making the filter more prone to cracking during use.

[0005] In other fields, the gases contained in triacetin also have adverse effects. For example, as a food additive, the presence of gases in triacetin can damage the texture of food, affecting its taste and appearance; as a drug carrier, the presence of gases may affect the stability and release performance of the drug; and as a plasticizer in plastic processing, the presence of gases can create pores or defects in plastic products, reducing their mechanical properties and appearance quality.

[0006] Therefore, degassing of triacetin is essential to improve product quality, prevent oxidation, reduce impurities, optimize performance, improve flowability, enhance stability, prevent foaming, and improve product performance and quality.

[0007] In addition, in order to improve the efficiency of the esterification reaction, it is necessary to fully mix raw materials such as glycerol and acetic acid in the reactor, which greatly takes up the esterification reaction time in the reactor and affects the production efficiency. Summary of the Invention

[0008] To address the problems mentioned in the background art, this application provides a degassing and homogenizing device for triacetin, which, in conjunction with esterification reaction equipment, homogenizes the raw materials at the front end of the esterification process to improve the efficiency of the esterification reaction. At the rear end of the esterification reaction, the triacetin is degassed to remove dissolved or mixed gases, providing a good foundation for subsequent refining reactions and improving the purity and quality of the triacetin.

[0009] To achieve the above objectives, this application adopts the following technical solution: a degassing and homogenizing device for triacetin, characterized in that it includes a raw material homogenizing treatment device, an esterification reaction device, and a finished product degassing treatment device.

[0010] The raw material homogenization equipment and the finished product degassing equipment are respectively located at the front end and the rear end of the esterification reaction equipment. The raw material homogenization equipment is connected to the inlet end of the esterification reaction equipment through a conveying pipeline, and the finished product degassing equipment is connected to the outlet end of the esterification reaction equipment through a conveying pipeline.

[0011] The esterification reaction equipment includes an esterification reactor 1, which is connected to a raw material homogenization treatment equipment and a finished product degassing treatment equipment, respectively.

[0012] The raw material homogenization equipment includes a glycerol storage tank 2, an acetic acid storage tank 3, a catalyst storage tank 4, and a water-carrying agent storage tank 5, as well as suction devices installed on each storage tank, including matching suction pumps 6 and pipelines, and a homogenization tank 7; wherein, the glycerol storage tank 2 has a heating layer on the outside, and the pipelines of the suction devices on each storage tank are connected to a self-sealing feed inlet on the homogenization tank 7. The connected pipeline is a telescopic structure that can extend into the feed inlet for feeding. After feeding is completed, it retracts and detaches from the homogenization tank 7, and the self-sealing feed inlet immediately closes automatically;

[0013] The homogenizing tank 7 consists of two hollow cylindrical tubes of different diameters coaxially mounted together. The larger cylindrical tube 7-1 is on the outside, and the smaller cylindrical tube 7-2 is on the inside. The two are mounted together on a support frame 8 with a base 7-3. The base 7-3 is positioned on the support frame 8 at a position coinciding with the axis of the larger cylindrical tube 7-1. A rotary motor 9 and a matching gearbox 10 are mounted below the base 7-3, and a protective cover is provided on the outside of the rotary motor 9 and the gearbox 10. The larger cylindrical tube 7-1 is fixed to the base 7-3. At least three columns 11 are also provided around the periphery of the support frame 8, and a rotating wheel 12 that fits against the outer wall of the larger cylindrical tube 7-1 is mounted on the columns 11. The larger cylindrical tube 7-1 rotates around its axis under the support of the rotating wheel 12 on the columns 11 and the base 7-3, and driven by the rotary motor 9.

[0014] The inner wall of the large cylindrical tube 7-1 is smooth, and several inclined blades are provided on the bottom surface, which are transversely traversed and intersect at the center of the bottom surface. A closable return port 7-4 is provided on the bottom surface of the large cylindrical tube 7-1 at a location offset from the base 7-3, and can be connected to a corresponding pipe. A small cylindrical tube 7-2 is coaxially fitted inside the large cylindrical tube 7-1, and a connecting frame 7-5 is provided on its top for fixation. A rotating lifting shaft 13, which passes through the top of the large cylindrical tube 7-1 and extends into the interior, is movably installed on the connecting frame 7-5. A rotating sealing structure 14 is provided at the contact point between the rotating lifting shaft 13 and the large cylindrical tube 7-1. The top of the rotating lifting shaft 13 is connected to a gearbox 10 on the outside of the large cylindrical tube 7-1. The gearbox 10 is driven by a rotary motor 9, which enables the small cylindrical tube 7-2 to move within the large cylindrical tube 7-1. The cylinder 7-1 rotates inside; the gearbox 10 and the rotary motor 9 are mounted on the platform 15 at the top of the support frame 8. A telescopic cylinder 17 is set between the platform 15 and the outer column 16 of the support frame 8. The telescopic cylinder 17 drives the entire platform 15, as well as the gearbox 10, the rotary motor 9, the rotary lifting shaft 13, and the small cylindrical cylinder 7-2 to rise and fall; the bottom of the small cylindrical cylinder 7-2 has a downward liquid outlet 7-6 connected to a rigid pipe. The rigid pipe passes downward through the bottom of the large cylindrical cylinder 7-1. The two are in a relatively movable state, and a rotary sealing structure 14 is set between the rigid pipe and the bottom of the large cylindrical cylinder 7-1; the cylinder wall of the small cylindrical cylinder 7-2 is divided into upper and lower parts. The lower part is kept sealed, and the upper part has evenly distributed leakage holes 7-7. The length of the upper part is greater than the length of the lower part.

[0015] The degassing equipment for the finished product is located at the rear end of the entire device. It uses pipelines to introduce the triacetin product generated in the esterification reactor 1 for degassing. The equipment includes a vacuum tank 18, an inlet, an outlet, a vacuum pump 19, and a distribution mechanism. The vacuum tank 18 is mounted on a support. A vacuum pump 19 is installed on the upper outer wall of the vacuum tank 18 to evacuate it to a predetermined vacuum state. A pressure gauge 20 is also provided to detect the pressure parameters inside the vacuum tank 18. The top of the vacuum tank 18 has an inlet, and the bottom has an outlet. Inside the vacuum tank 18, a distribution mechanism is provided, connected to the inlet, to continuously and evenly distribute the input triacetin onto the inner wall of the vacuum tank 18 to form a thin film. The distribution mechanism includes an inlet pipe 21, a rotating pipe 22, a distributor 23, distribution fins 24, and a rotating scraper 25. The inlet pipe 21 is connected to the inlet to draw out the triacetin, and the rotating pipe 22 is connected to the inlet pipe 21. A rotary sealing structure 14 is used for connection; the rotary tube 22 is connected to the rotary motor 9 located on the top of the vacuum tank 18 via gear meshing, and is driven to rotate by it; a distributor 23 is installed at the lower end of the rotary tube 22, and the distributor 23 is connected to several fabric fins 24 attached to the inner wall of the vacuum tank 18 via a support pipe. The fabric fins 24 have material holes 24-1 of different heights distributed on them, and the material holes 24-1 connected on two adjacent fabric fins 24 are at different heights; at least three rotary scrapers 25 are fixed below the distributor 23 by a connecting rod. The rotary scrapers 25 are close to the inner wall of the vacuum tank 18, and the gap between them can be adjusted; the rotary motor 9 drives the rotary shaft to rotate, which in turn drives the fabric fins 24 to rotate against the inner wall of the vacuum tank 18. At the same time, the triacetin flowing out of the material holes 24-1 flows continuously downward along the inner wall of the vacuum tank 18, and the rotary scrapers 25 below spread these triacetins into a uniform film, increasing its surface area.

[0016] Preferably, blades are evenly distributed on the inner wall of the large cylindrical tube 7-1 and the lower part of the inner wall of the small cylindrical tube 7-2, so that the material inside the large cylindrical tube 7-1 and the small cylindrical tube 7-2 is sheared by rotating and changing speed.

[0017] Preferably, the length ratio of the upper and lower parts of the wall of the small cylindrical tube 7-2 is 5:1.

[0018] Preferably, the rotary sealing structure 14 at the contact point between the rotary lifting shaft 13 and the large cylindrical tube 7-1, the rotary sealing structure 14 between the rigid tube on the small cylindrical tube 7-2 and the bottom of the large cylindrical tube 7-1, and the rotary sealing structure 14 between the rotary tube 22 and the feed tube 21 in the vacuum tank 18 are selected from any one of the following: double-end mechanical seal structure, hydrodynamic seal structure, and bellows mechanical seal structure. Beneficial effects

[0019] The degassing and homogenizing devices for triacetin esters described in this application are respectively installed before and after the triacetin ester esterification reaction section. The homogenizing devices can effectively promote the uniformity of mixing of raw materials such as glycerol and acetic acid, improve the degree and efficiency of the esterification reaction, and shorten the reaction time. After the esterification reaction is completed, the triacetin ester product is degassed, which can effectively remove the mixed gases in the triacetin ester, prevent oxidation and deterioration, and improve the transparency and purity of the product after removing the internal gases. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the degassing and homogenizing device.

[0021] Figure 2 This is a plan view of the degassing and homogenizing device.

[0022] Figure 3 This is a schematic diagram of the fabric mechanism.

[0023] Figure 4 This is a schematic diagram of the raw material homogenization equipment.

[0024] Figure 5 This is a schematic diagram of the structure of the finished product degassing treatment equipment.

[0025] In the diagram, the components are: 1. Reactor; 2. Glycerin storage tank; 3. Acetic acid storage tank; 4. Catalyst storage tank; 5. Water-carrying agent storage tank; 6. Suction pump; 7. Homogenizing tank; 7-1. Large cylindrical cylinder; 7-2. Small cylindrical cylinder; 7-3. Base; 7-4. Reflux port; 7-5. Connecting frame; 7-6. Liquid outlet; 7-7. Leakage hole; 8. Support frame; 9. Rotary motor; 10. Gearbox; 11. Column; 12. Rotary lifting shaft; 13. Rotary sealing structure; 14. Platform; 15. External column; 16. Telescopic cylinder; 17. Vacuum tank; 18. Vacuum pump; 19. Pressure gauge; 20. Feed pipe; 21. Rotary pipe; 22. Distributor; 23. Fabric fins; 24. Material hole; 24-1. Rotary scraper; 25. Detailed Implementation Example 1

[0026] like Figure 1 , 2As shown in Figures 4 and 5, the degassing and homogenizing device for triacetin esters described in this embodiment includes a raw material homogenizing device, an esterification reaction device, and a finished product degassing device. The raw material homogenizing device and the finished product degassing device are respectively located at the front and rear ends of the triacetin esterification reaction device. The raw material homogenizing device is connected to the inlet end of the reaction vessel 1 through a conveying pipe, and the finished product degassing device is connected to the outlet end of the esterification reaction device through a conveying pipe. The esterification reaction device includes an esterification reaction unit, which is connected to both the raw material homogenizing device and the finished product degassing device. The finished product degassing device is located at the rear end of the entire device, and the finished triacetin ester product generated by the esterification reaction device is introduced into the device through a pipe for degassing.

[0027] First, the raw material homogenization equipment includes a glycerol storage tank 2, an acetic acid storage tank 3, a catalyst storage tank 4, and a water-carrying agent storage tank 5, as well as suction devices installed on each storage tank, including matching suction pumps 6 and pipelines, and a homogenization tank 7. The glycerol storage tank 2 has an external heating layer, and the pipelines of the suction devices on each storage tank are connected to the feed inlet on the homogenization tank 7. The connected pipeline is a telescopic structure, capable of extending into the feed inlet for feeding, and retracting out of the homogenization tank 7 after feeding. The homogenization tank 7 consists of two hollow cylindrical tubes of different diameters coaxially mounted together, with the larger cylindrical tube 7-1 on the outside and the smaller cylindrical tube 7-2 on the inside, both installed as a whole on a support with a base 7-3. On the support frame 8, the base 7-3 is positioned on the support frame 8 at a position coinciding with the axis of the large cylindrical tube 7-1. A rotary motor 9 and a matching gearbox 10 are installed below it, and a protective cover is provided outside the rotary motor 9 and gearbox 10. The large cylindrical tube 7-1 is fixed to the base 7-3. Four columns 11 are also provided around the periphery of the support frame 8, and rotating wheels 12 that fit against the outer wall of the large cylindrical tube 7-1 are installed on the columns 11. The large cylindrical tube 7-1 rotates around its axis under the support of the rotating wheels on the columns 11 and the base 7-3, and driven by the rotary motor 9 and gearbox 10. The inner wall of the large cylindrical tube 7-1 is smooth, and several inclined blades are provided on the bottom surface, traversing the entire bottom surface and intersecting at the center of the bottom surface. A closable return port 7-4 is provided at the part of the bottom surface offset from the base 7-3, which can be connected to the corresponding pipe; a small cylindrical tube 7-2 is coaxially installed inside the large cylindrical tube 7-1, and a connecting frame 7-5 is provided at its top for fixation. A rotating lifting shaft 13 that passes through the top of the large cylindrical tube 7-1 and extends into the interior is movably installed on the connecting frame 7-5; a rotating sealing structure 14 is provided at the contact part between the rotating lifting shaft 13 and the large cylindrical tube 7-1; the top of the rotating lifting shaft 13 outside the large cylindrical tube 7-1 is connected to the gearbox 10, which is driven by the rotary motor 9 to realize the rotation of the small cylindrical tube 7-2 inside the large cylindrical tube 7-1; the gearbox 10 and the rotary motor 9 are mounted on the platform 15 on the top of the support frame 8. Above, a telescopic cylinder 17 is installed between the platform 15 and the outer column 16 of the support frame 8, which can drive the entire platform 15 and the connected gearbox 10, rotary motor 9, rotary lifting shaft 13 and small cylindrical cylinder 7-2 to rise and fall; the bottom of the small cylindrical cylinder 7-2 has a downward liquid outlet 7-6 connected to a rigid pipe, which passes downward through the bottom of the large cylindrical cylinder 7-1. The two are in a relatively movable state, and a rotary sealing structure 14 is installed between the rigid pipe and the bottom of the large cylindrical cylinder 7-1; the cylinder wall of the small cylindrical cylinder 7-2 is divided into upper and lower parts, wherein the lower part is kept sealed, and the upper part has evenly distributed leakage holes 7-7. Under the action of the telescopic cylinder, the small cylindrical cylinder 7-2 can move up and down inside the large cylindrical cylinder 7-1.

[0028] The finished product degassing equipment includes a vacuum tank 18, an inlet, an outlet, a vacuum pump 19, and a fabric distribution mechanism. The vacuum tank 18 is mounted on a support. A vacuum pump 19 is installed on the upper outer wall of the vacuum tank 18 to evacuate the tank to a predetermined vacuum state. A pressure gauge 20 is also provided to detect the pressure parameters inside the vacuum tank 18. The top of the vacuum tank 18 has an inlet, and the bottom has an outlet. Inside the vacuum tank 18, there is a fabric distribution mechanism that communicates with the inlet and continuously and evenly distributes the input triacetin onto the inner wall of the vacuum tank 18 to form a thin film. The fabric distribution mechanism includes an inlet pipe 21, a rotating pipe 22, a distributor 23, fabric fins 24, and a rotating scraper 25. The inlet pipe 21 is connected to the inlet and distributes the triacetin... The rotating tube 22 is connected to the feed tube 21 by a rotating sealing structure 14. The rotating tube 22 is driven to rotate by the rotating shaft of the rotating motor 9 installed on the top of the vacuum tank 18 through gear meshing. A distributor 23 is installed at the lower end of the rotating tube 22. The distributor 23 is connected to several fabric fins 24 attached to the inner wall of the vacuum tank 18 through a support pipe. The fabric fins 24 have material holes 24-1 of different heights. The material holes 24-1 connected on two adjacent fabric fins 24 are at different heights. The line connecting the positions of the material holes 24-1 on all fabric fins 24 is distributed in a stepped or wavy shape. At least three rotating scrapers 25 are fixed below the distributor 23 by a connecting rod. The rotating scrapers 25 are close to the inner wall of the vacuum tank 18 and the gap between them can be adjusted.

[0029] Workflow:

[0030] First, control the extension of the telescopic cylinder 17 to drive the entire platform 15, gearbox 10, rotary motor 9, rotary lifting shaft 13, and small cylindrical cylinder 7-2 to rise and fall, raising the small cylindrical cylinder 7-2 in the large cylindrical cylinder 7-1. Then, preheated glycerol from the glycerol storage tank 2 and acetic acid from the acetic acid storage tank 3 are introduced into the large cylindrical cylinder 7-1 in proportion. After that, the catalyst and water-carrying agent from the catalyst storage tank 4 and the water-carrying agent storage tank 5 are added to the large cylindrical cylinder 7-1. The total amount of various mixtures added does not exceed the lower part of the small cylindrical cylinder 7-2, ensuring that the mixtures in the large cylindrical cylinder 7-1 do not overflow the leakage hole 7-7 in the upper part of the small cylindrical cylinder 7-2 and enter it.

[0031] The rotary motor 9 located below the support frame 8 is activated. The large cylindrical tube 7-1, supported by the rotating wheel 12 on the column 11 and the base 7-3, and driven by the rotary motor 9 and the gearbox 10, rotates around the axis to perform preliminary homogenization of the mixture inside.

[0032] After a period of initial homogenization, the telescopic cylinder 17 is shortened, causing the small cylindrical cylinder 7-2 inside the large cylindrical cylinder 7-1 to fall. This allows most of the mixture in the large cylindrical cylinder 7-1 to overflow through the drain hole 7-7 in the upper part of the small cylindrical cylinder 7-2 and enter the interior of the small cylindrical cylinder 7-2. The remaining mixture inside the large cylindrical cylinder 7-1 can enter the small cylindrical cylinder 7-2 through the feed pipe 21 via the return port 7-4, or be discharged directly. Then, the small cylindrical cylinder 7-2 is raised again, and the rotation and speed change of the small cylindrical cylinder 7-2 are driven by the gearbox 10 and the rotary motor 9 on the platform 15 to shear the material inside, thus achieving secondary homogenization.

[0033] The mixture after two homogenization processes enters the esterification reactor 1 through a pipeline for esterification reaction to obtain triacetin ester product, which then enters the product degassing equipment through a pipeline for degassing treatment.

[0034] Triacetin enters the vacuum tank 18 through the feed pipe 21, rotating pipe 22, distributor 23, and fabric fins 24. The vacuum pump 19 operates to maintain the vacuum inside the tank. The rotating pipe 22 is driven to rotate by the rotating shaft of the rotating motor 9 located on the top of the vacuum tank 18 through gear meshing. The triacetin flows continuously downward along the inner wall of the vacuum tank 18 through the feed holes 24-1 on the distributor 23 and fabric fins 24. The rotating scraper 25 below spreads the triacetin into a uniform film, increasing its surface area. Under the vacuum state of the vacuum tank 18, the gas is separated from the triacetin. Example 2

[0035] like Figure 1 , 2 As shown in Figure 3, the degassing and homogenizing device for triacetin described in this embodiment has a structure that is basically the same as that in Embodiment 1, except that: blades are evenly distributed on the inner wall of the large cylindrical cylinder 7-1 and the lower part of the inner wall of the small cylindrical cylinder 7-2, and the material inside is sheared by the rotation and speed change of the large cylindrical cylinder 7-1 and the small cylindrical cylinder 7-2; the length ratio of the upper and lower parts of the wall of the small cylindrical cylinder 7-2 is 4:1.

[0036] In addition, the rotary sealing structure 14 at the contact point between the rotary lifting shaft 13 and the large cylindrical tube 7-1, the rotary sealing structure 14 between the rigid tube on the small cylindrical tube 7-2 and the bottom of the large cylindrical tube 7-1, and the rotary sealing structure 14 between the rotary tube 22 and the feed tube 21 in the vacuum tank 18 can be selected from any one of the following: double-end mechanical seal structure, hydrodynamic seal structure, and bellows mechanical seal structure.

Claims

1. A degassing and homogenizing device for triacetin, characterized in that, This includes raw material homogenization equipment, esterification reaction equipment, and finished product degassing equipment; The raw material homogenization equipment and the finished product degassing equipment are respectively located at the front end and the rear end of the esterification reaction equipment. The raw material homogenization equipment is connected to the inlet end of the esterification reaction equipment through a conveying pipeline, and the finished product degassing equipment is connected to the outlet end of the esterification reaction equipment through a conveying pipeline. The raw material homogenization equipment includes a glycerol storage tank (2), an acetic acid storage tank (3), a catalyst storage tank (4), and a water-carrying agent storage tank (5), as well as a suction pump (6) and pipelines installed on each storage tank, and a homogenization tank (7). The esterification reaction equipment includes an esterification reactor (1), which is connected to a raw material homogenization treatment equipment and a finished product degassing treatment equipment, respectively. The finished product degassing equipment is located at the rear end of the whole set of equipment. It uses pipelines to introduce the triacetin ester product generated in the esterification reactor (1) and degas it; it includes a vacuum tank (18), a vacuum pump (19) and a fabric feeding mechanism.

2. The degassing and homogenizing apparatus for triacetin according to claim 1, characterized in that, The glycerin storage tank (2) has a heating layer on the outside, and the pipes of the suction devices on each storage tank are connected to the self-sealing feed inlet on the homogenizing tank (7). The connected pipes are telescopic structures.

3. The degassing and homogenizing apparatus for triacetin according to claim 1, characterized in that, The homogenizing tank (7) consists of two hollow cylindrical tubes of different diameters coaxially mounted together. The larger cylindrical tube (7-1) is on the outside, and the smaller cylindrical tube (7-2) is on the inside. The two are mounted together on a support frame (8) with a base (7-3). The base (7-3) is located on the support frame (8) at a position that coincides with the axis of the larger cylindrical tube (7-1). A rotary motor (9) is installed below the base (7-3), and a protective cover is installed on the outside of the rotary motor (9). The larger cylindrical tube (7-1) is fixed to the base (7-3). At least three columns (11) are also provided on the periphery of the support frame (8), and a rotating wheel (12) that fits against the outer wall of the larger cylindrical tube (7-1) is installed on the columns (11). The inner wall of the large cylindrical tube (7-1) is smooth, and several inclined blades are provided on the bottom surface, which cross the entire bottom surface and intersect at the center of the bottom surface; the bottom surface of the large cylindrical tube (7-1) is provided with an openable and closable return port (7-4) and connected to the corresponding pipe; a small cylindrical tube (7-2) is coaxially mounted inside the large cylindrical tube (7-1), and a connecting frame (7-5) is provided on its top and fixed thereto. A rotating lifting shaft (13) that passes through the top of the large cylindrical tube (7-1) and extends into the interior is movably installed on the connecting frame (7-5); a rotating sealing structure (14) is provided at the contact part between the rotating lifting shaft (13) and the large cylindrical tube (7-1); the top of the rotating lifting shaft (13) is connected to the gearbox (10) outside the large cylindrical tube (7-1), and the gearbox (10) is driven by a rotary motor (9) to drive the small cylindrical tube (7-2) to rotate; The gearbox (10) and the rotary motor (9) are mounted on the platform (15) at the top of the support frame (8). A telescopic cylinder (17) is set between the platform (15) and the outer column (16) of the support frame (8). The telescopic cylinder (17) drives the entire platform (15), as well as the gearbox (10), the rotary motor (9), the rotary lifting shaft (13), and the small cylindrical tube (7-2) to rise and fall. The bottom of the small cylindrical tube (7-2) has a downward liquid outlet (7-6) and is connected to a rigid tube. The rigid tube passes downward through the bottom of the large cylindrical tube (7-1). A rotary sealing structure (14) is set between the rigid tube and the bottom of the large cylindrical tube (7-1). The cylinder wall of the small cylindrical tube (7-2) is divided into upper and lower parts. The lower part is sealed, and the upper part has evenly distributed leakage holes (7-7). The length of the upper part is greater than the length of the lower part.

4. The degassing and homogenizing apparatus for triacetin according to claim 1, characterized in that, The vacuum tank (18) is mounted on a bracket. A vacuum pump (19) and a pressure gauge (20) are provided on the upper outer wall of the vacuum tank (18). The top of the vacuum tank (18) has a feed inlet and the bottom has a discharge outlet. A fabric feeding mechanism connected to the feed inlet is provided inside the vacuum tank (18). The fabric feeding mechanism includes a feed pipe (21), a rotating pipe (22), a distributor (23), fabric fins (24), and a rotating scraper (25). The feed pipe (21) is connected to the feed inlet, and the rotating pipe (22) is connected to the feed pipe (21) by a rotating sealing structure (14). The rotating pipe (22) is connected to the rotating shaft of a rotating motor (9) located on the top of the vacuum tank (18) by gear meshing, and is driven to rotate by the rotating motor. A distributor (25) is installed at the lower end of the rotating pipe (22). 3) The distributor (23) is connected to several fabric fins (24) attached to the inner wall of the vacuum tank (18) through a support pipe. The fabric fins (24) have material holes (24-1) of different heights. The material holes (24-1) connected on two adjacent fabric fins (24) are at different heights. At least three rotating scrapers (25) are fixed below the distributor (23) by a connecting rod. The rotating scrapers (25) are close to the inner wall of the vacuum tank (18) and the gap between them can be adjusted. The rotating motor (9) drives the rotating shaft to rotate, which in turn drives the fabric fins (24) to rotate against the inner wall of the vacuum tank (18). At the same time, the triacetin flowing out of the material holes (24-1) flows continuously downward along the inner wall of the vacuum tank (18). The rotating scrapers (25) below spread the triacetin into a uniform film.

5. The degassing and homogenizing apparatus for triacetin according to claim 3, characterized in that, Blades are evenly distributed on the inner wall of the large cylindrical tube (7-1) and the lower part of the inner wall of the small cylindrical tube (7-2).

6. The degassing and homogenizing apparatus for triacetin according to claim 3, characterized in that, The length ratio of the upper and lower parts of the wall of the small cylindrical tube (7-2) is 5:

1.

7. The degassing and homogenizing apparatus for triacetin according to claim 3, characterized in that, The rotary sealing structure (14) at the contact point between the rotary lifting shaft (13) and the large cylindrical tube (7-1), the rotary sealing structure (14) between the rigid tube on the small cylindrical tube (7-2) and the bottom of the large cylindrical tube (7-1), and the rotary sealing structure (14) between the rotary tube (22) and the feed tube (21) in the vacuum tank (18) can be selected from any one of the following: double-end mechanical seal structure, hydrodynamic seal structure, and bellows mechanical seal structure.

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