A reaction device for preparing benzyl acetate

Abstract

The utility model discloses a benzyl acetate preparation technical field's reaction unit is used in benzyl acetate preparation, including the reaction kettle, the reaction kettle top and be close to two sides respectively install the feed pipe, the reaction kettle inside rotation is installed with the pivot, the reaction kettle top and be located pivot both sides respectively install the driven shaft, install the driving piece between pivot and driven shaft, pivot outside and driven shaft all are installed with the agitator respectively, a plurality of feed pipes can respectively inject different raw materials to the reaction kettle, and driving piece drives two driven shafts to rotate simultaneously through pivot to make pivot and two driven shafts drive agitator to cooperate and mix, and the residual solution and the wall -hanging raw material solution are scraped and mixed through the scraping piece, improve the rate of material solution mixing reaction and the effect of cleaning material.

Description

Technical Field

[0001] This utility model relates to the field of benzyl acetate preparation, specifically a reaction apparatus for preparing benzyl acetate. Background Technology

[0002] Benzyl acetate is a chemical product widely used in fragrances, solvents and other fields. The mixing uniformity of the reaction system and the utilization rate of raw materials during its preparation are key factors affecting the product yield and purity. In the current benzyl acetate preparation process, the structural design of the reaction device has a significant constraint on the reaction efficiency.

[0003] Currently, most reaction devices for the preparation of benzyl acetate adopt a single-shaft stirring structure, that is, a single stirring shaft drives the blades to stir the solution in the reaction vessel 1. This single stirring method has significant limitations: due to the limited stirring range, the solution is prone to local circulation in the vessel, and the raw materials (such as acetic acid, benzyl alcohol and catalyst) are difficult to diffuse quickly and make sufficient contact, resulting in a low mixing rate and a prolonged time to reach equilibrium. Especially in the later stage of the reaction, as the product benzyl acetate is formed, the solution viscosity changes, and the single-shaft stirring is even more difficult to break the concentration gradient, which not only reduces the reaction efficiency, but may also affect the purity of the product due to incomplete local reaction.

[0004] Meanwhile, the problem of residual solution on the inner wall of reaction vessel 1 has not been effectively solved for a long time. There is a certain gap between the stirring blades of the existing reaction device and the vessel wall, making it impossible to scrape off the solution adhering to the wall surface. These residual solutions contain unreacted raw materials and products, which not only wastes raw materials (especially for high-value raw materials), but also mixes new solution systems into subsequent batches of reactions. If the residual solution deteriorates or undergoes side reactions with new raw materials, it will directly affect the quality of the next batch of products, increasing the difficulty of purification and production costs.

[0005] In addition, the existing reaction equipment has poor compatibility between the stirring structure and the tank wall. Even if some equipment reduces the gap by increasing the length of the stirring blades, the friction between the blades and the tank wall can easily cause equipment wear and shorten the service life of the equipment. Moreover, cleaning the residual solution requires manual rinsing after stopping the machine, which is cumbersome and time-consuming, further reducing the efficiency of continuous production.

[0006] In summary, existing reaction apparatuses for benzyl acetate preparation have shortcomings in terms of solution mixing rate, treatment of residual solution on tank walls, and adaptability to continuous production, failing to meet the demands of efficient and stable industrial production. Therefore, designing a reaction apparatus that can improve mixing efficiency and simultaneously clean residual solution from tank walls is of great significance for optimizing the benzyl acetate preparation process. Utility Model Content

[0007] The purpose of this invention is to provide a reaction apparatus for the preparation of benzyl acetate, so as to solve the problems mentioned in the background art.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a reaction apparatus for preparing benzyl acetate, comprising a reaction vessel, with feed pipes installed on the top and near both sides of the reaction vessel, a rotating shaft rotatably mounted inside the reaction vessel, driven shafts installed on the top of the reaction vessel and on both sides of the rotating shaft, a driving component installed between the rotating shaft and the driven shaft, and agitators installed on the outer side of the rotating shaft and the driven shaft, and a scraper for scraping and cleaning installed on the outer side of the rotating shaft near the lower middle part; the agitator includes three fixed rods fixedly connected to the rotating shaft, three circumferentially arranged support rods fixedly connected to the outer side of the driven shaft, an agitator fixedly connected to one side of each fixed rod, and an agitator column fixedly connected to one side of each support rod, the agitator rod and the agitator column being offset; the agitator also includes three sets of circumferentially arranged mounting rods fixedly connected to the outer side of the driven shaft near the lower middle part, a fixed shaft fixedly connected between each set of mounting rods, a fixed ring fitted on the outer side of each fixed shaft, and three circumferentially arranged agitator plates fixedly connected to the outer side of each fixed ring.

[0009] Preferably, the driving component includes a fixing frame, which is installed on the top of the reaction vessel and located at the top of the rotating shaft. A motor is installed on the top of the reaction vessel and located at the top of the rotating shaft. A first gear is fitted on the top of the rotating shaft, and a second gear is fitted on the outside of the driven shaft. The first gear meshes with the second gear.

[0010] Preferably, the scraper includes three support frames fixedly connected to the outside of the rotating shaft, and a scraper is installed on one side of the support frame through multiple connecting parts.

[0011] Preferably, the scraper further includes three sets of connecting rods fixedly connected to the bottom of the rotating shaft, each set of connecting rods having a scraper blade fixedly installed, and each set of connecting rods including two.

[0012] Preferably, a plurality of external support rods are fixedly connected to the outer side of the rotating shaft and near the lower middle part, and a stirring plate is installed on the outer side of the external support rods.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] 1. Multiple feed pipes can inject different raw materials into the reaction vessel respectively. The drive unit drives two driven shafts to rotate simultaneously through the rotating shaft, so that the rotating shaft and the two driven shafts drive the agitator to stir and mix. The scraper scrapes and stirs the residual solution and raw material solution hanging on the wall, thereby improving the reaction rate of the material solution and the cleaning effect of the material.

[0015] 2. The fixed frame can support the motor, and the rotating shaft passes through the fixed frame and is rotatably connected to it. The motor can drive the first gear on the outside of the rotating shaft to rotate, and the first gear can drive the driven shafts in the two second gears to rotate, so that the rotating shaft and the two driven shafts can simultaneously drive the solution to stir and mix. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 This is a left-side sectional perspective view of the overall structure of this utility model;

[0018] Figure 3 The overall structure of this utility model Figure 2 Enlarged view of point A in the middle;

[0019] Figure 4 The overall structure of this utility model Figure 2 Enlarged view of section B in the middle.

[0020] In the diagram: 1. Reaction vessel; 2. Feed pipe; 3. Rotating shaft; 4. Driven shaft; 5. Fixing frame; 6. Motor; 7. First gear; 8. Second gear; 9. Fixing rod; 10. Support rod; 11. Stirring rod; 12. Stirring column; 13. Mounting rod; 14. Fixing shaft; 15. Fixing ring; 16. Stirring plate; 17. Supporting frame; 18. Scraper; 19. Connecting rod; 20. Scraper strip; 21. External support rod; 22. Stirring plate; 171. Connecting part. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example 1

[0023] Please refer to Figure 1-4 As shown, this utility model provides a reaction apparatus for the preparation of benzyl acetate, including a reaction vessel 1, a feed pipe 2 installed on the top of the reaction vessel 1 and near both sides, a rotating shaft 3 rotatably installed inside the reaction vessel 1, a driven shaft 4 installed on the top of the reaction vessel 1 and on both sides of the rotating shaft 3, a driving component installed between the rotating shaft 3 and the driven shaft 4, an agitator installed on the outside of the rotating shaft 3 and the driven shaft 4, and a scraper for scraping and cleaning installed on the outside of the rotating shaft 3 and near the middle and lower part.

[0024] In addition, multiple feed pipes 2 can inject different raw materials into the reaction tank 1 respectively. The driving component drives two driven shafts 4 to rotate simultaneously through the rotating shaft 3, so that the rotating shaft 3 and the two driven shafts 4 drive the stirring component to stir and mix. The scraper scrapes and stirs the residual solution and the raw material solution hanging on the wall, thereby improving the reaction rate of the material solution and the cleaning effect of the material.

[0025] Specifically, the driving component includes a fixed frame 5 at the top of the reaction vessel 1 and at the top of the rotating shaft 3, a motor 6 is mounted at the top of the reaction vessel 1 and at the top of the rotating shaft 3, a first gear 7 is mounted on the top of the rotating shaft 3, and a second gear 8 is mounted on the outside of the driven shaft 4, with the first gear 7 meshing with the second gear 8.

[0026] The fixed frame 5 supports the motor 6, the rotating shaft 3 passes through the fixed frame 5 and is rotatably connected to it, the motor 6 can drive the first gear 7 on the outside of the rotating shaft 3 to rotate, the first gear 7 can drive the driven shaft 4 in the two second gears 8 to rotate, so that the rotating shaft 3 and the two driven shafts 4 can simultaneously drive the solution to stir and mix.

[0027] More specifically, the agitator includes three fixed rods 9 fixedly connected to the rotating shaft 3, three circumferentially arranged support rods 10 fixedly connected to the outside of the driven shaft 4, an agitator rod 11 fixedly connected to one side of the fixed rods 9, an agitator column 12 fixedly connected to one side of the support rods 10, the agitator rods 11 and the agitator column 12 being staggered, the agitator also includes three sets of circumferentially arranged mounting rods 13 fixedly connected to the outside of the driven shaft 4 near the middle and lower part, a fixed shaft 14 fixedly connected between each set of mounting rods 13, a fixed ring 15 fitted on the outside of the fixed shaft 14, three circumferentially arranged agitator plates 16 fixedly connected to the outside of the fixed ring 15, and multiple external support rods 21 fixedly connected to the outside of the rotating shaft 3 near the middle and lower part, with agitator plates 22 installed on the outside of the external support rods 21.

[0028] It should be added that the fixed rod 9 and the stirring rod 11 form a T-shape, and the support rod 10 and the stirring column 12 form a cross shape. The rotating shaft 3 can drive the fixed rod 9 and the driven shaft 4 to drive the support rod 10 to rotate relative to each other. The fixed rod 9 drives the stirring rod 11 and the support column to drive the stirring column 12 to rotate relative to each other to stir and mix the solution. The driven shaft 4 drives the fixed shaft 14 to rotate through the mounting rod 13. The fixed ring 15 on the outside of the fixed shaft 14 drives the stirring plate 16 to stir the solution. While the solution is being stirred, the stirring plate 16 is pushed to drive the fixed ring 15 to rotate around the fixed shaft 14 to increase the mixing rate of the solution.

[0029] Furthermore, the stirring plate 22 is spiral-shaped, and the rotating shaft 3 drives the stirring plate 22 through multiple external support rods 21 to stir and mix the solution in the middle and lower part of the solution reaction tank 1, which can prevent the solution from separating and affecting the uniformity of solution mixing.

[0030] Furthermore, the scraping component includes three support frames 17 fixedly connected to the outside of the rotating shaft 3. A scraper 18 is installed on one side of the support frame 17 through multiple connecting parts 171. The scraping component also includes three sets of connecting rods 19 fixedly connected to the bottom of the rotating shaft 3. Each set of connecting rods 19 is fixedly equipped with a scraper 20, and each set of connecting rods 19 includes two.

[0031] The support frame 17 has an L-shaped cross section and can support the scraper 18 upward through the connecting part 171 so that the scraper 18 can adapt to the upper part of the reaction tank 1 for scraping. The scraper 20 has an arc-shaped cross section and the rotating shaft 3 drives the scraper 20 to scrape the inner wall of the bottom of the reaction tank 1 through the connecting rod 19, thereby cleaning the inner wall of the reaction tank 1 and avoiding solution residue or raw material adhering to the wall, which would affect the solution mixing and reaction rate.

[0032] Working principle: First, start the motor 6, which drives the first gear 7 on the outside of the rotating shaft 3 to rotate. At this time, the first gear 7 drives the driven shaft 4 in the two second gears 8 to rotate. The rotating shaft 3 and the driven shaft 4 rotate synchronously. At this time, the fixed rod 9 drives the stirring rod 11 and the support column to drive the stirring column 12 to rotate relative to each other, stirring and mixing the solution. While the solution is being stirred, the stirring plate 16 drives the fixed ring 15 to rotate around the fixed shaft 14. At the same time, the rotating shaft 3 drives the stirring plate 22 through multiple external support rods 21 to stir and mix the solution in the middle and lower part of the solution reaction tank 1.

[0033] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0034] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A reaction apparatus for the preparation of benzyl acetate, comprising a reaction vessel (1), characterized in that: Feed pipes (2) are installed on the top and near both sides of the reaction vessel (1). A rotating shaft (3) is rotatably installed inside the reaction vessel (1). A driven shaft (4) is installed on the top of the reaction vessel (1) and on both sides of the rotating shaft (3). A driving component is installed between the rotating shaft (3) and the driven shaft (4). A stirring component is installed on the outside of the rotating shaft (3) and the driven shaft (4). A scraping component for scraping and cleaning is installed on the outside of the rotating shaft (3) and near the middle and lower part. The stirring component includes three fixed rods (9) fixedly connected to the rotating shaft (3). A circumferential row is fixedly connected to the outside of the driven shaft (4). The column has three support rods (10), one side of the fixed rod (9) is fixedly connected to a stirring rod (11), and one side of the support rod (10) is fixedly connected to a stirring column (12). The stirring rod (11) and the stirring column (12) are offset. The stirring component also includes three sets of mounting rods (13) arranged in a circle, which are fixedly connected to the outside of the driven shaft (4) and near the middle and lower part. Each set of mounting rods (13) is fixedly connected to a fixed shaft (14). A fixed ring (15) is fitted on the outside of the fixed shaft (14). Three stirring plates (16) arranged in a circle are fixedly connected to the outside of the fixed ring (15).

2. The reaction apparatus for preparing benzyl acetate according to claim 1, characterized in that: The driving component includes a fixed frame (5), which is installed on the top of the reaction vessel (1) and on the top of the rotating shaft (3). A motor (6) is installed on the top of the reaction vessel (1) and on the top of the rotating shaft (3). A first gear (7) is fitted on the top of the rotating shaft (3), and a second gear (8) is fitted on the outside of the driven shaft (4). The first gear (7) meshes with the second gear (8).

3. The reaction apparatus for preparing benzyl acetate according to claim 1, characterized in that: The scraper includes three support frames (17) fixedly connected to the outside of the rotating shaft (3), and a scraper (18) is installed on one side of the support frame (17) through multiple connecting parts (171).

4. The reaction apparatus for preparing benzyl acetate according to claim 3, characterized in that: The scraper also includes three sets of connecting rods (19) fixedly connected to the bottom of the rotating shaft (3). Each set of connecting rods (19) is fixedly equipped with a scraper (20), and each set of connecting rods (19) includes two.

5. The reaction apparatus for preparing benzyl acetate according to claim 1, characterized in that: Multiple external support rods (21) are fixedly connected to the outer side of the rotating shaft (3) and near the middle and lower part, and a stirring plate (22) is installed on the outer side of the external support rods (21).

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