An esterification kettle for butyl acetate reaction

Abstract

This invention discloses an esterification reactor for butyl acetate reaction, comprising an esterification reactor body with an opening at the top. A cover plate is rotatably connected to a first region of the opening, and a drive box is fixed above a second region. A motor is located outside the drive box, and two coaxially nested stirring shafts are rotatably connected inside the drive box. The drive box contains a power distribution mechanism composed of a pulley set and a gear set, enabling coaxial bidirectional independent stirring of the two stirring shafts driven by a single motor. The first stirring shaft is equipped with stirring blades, and the second stirring shaft is equipped with a stirring frame with a scraper and stirring rod. The second region of the opening has a feed pipe and an exhaust pipe. This invention effectively eliminates mixing dead zones, improves mixing efficiency and reaction effect, the scraper can remove adhering substances from the reactor wall in real time, and the partitioned opening design takes into account both closed production and convenient cleaning. The structure is reasonable and the operation is convenient.

Description

Technical Field

[0001] This invention relates to the field of chemical reaction equipment technology, and in particular to an esterification reactor for butyl acetate reaction. Background Technology

[0002] Butyl acetate is obtained by esterification of acetic acid and n-butanol in the presence of sulfuric acid. Butanol, acetic acid, and sulfuric acid are added to an esterification reactor in a specific ratio, and the esterification reaction is carried out at approximately 120°C. After reflux dehydration, neutralization, and distillation, the final product is obtained. The esterification reactor is the core equipment in butyl acetate production, and its stirring performance directly affects the mixing uniformity of the materials inside the reactor, the mass and heat transfer efficiency, and the final product yield. In actual production, a powerful, high-speed rotating stirring shaft is needed to drive the raw materials for stirring. The raw materials generate vortices as the stirring shaft rotates, accelerating the mixing of the reactants.

[0003] However, existing butyl acetate esterification reactors still have certain structural defects. For example, a search reveals that Chinese Patent Publication No. CN217042495U discloses an esterification reactor for butyl acetate production. This reactor uses a drive motor to rotate the transmission shaft and stirring rod to stir the raw materials, while simultaneously using a worm gear drive to move a push plate up and down to promote the flow of the raw materials at the bottom. However, this design is structurally complex, and the reciprocating motion range of the push plate is limited, making it difficult to effectively circulate and disturb the materials within the entire reactor cavity. Another example is Chinese Patent Publication No. CN219150112U, which discloses a butyl acetate esterification reactor. This reactor uses a rotating stirring rod to stir the raw materials, and a moving spiral rod to move up and down to tumble the raw materials and increase the flowability of the bottom materials. However, this design requires two separate drive systems for the rotating and moving devices, resulting in a complex structure and high energy consumption. Furthermore, existing esterification reactors also suffer from problems such as material adhesion to the reactor walls and difficulty in cleaning during long-term operation. The conventional closed structure of the reactor body makes internal cleaning and maintenance difficult. Summary of the Invention

[0004] The purpose of this invention is to provide an esterification reactor for the reaction of butyl acetate, so as to solve the above-mentioned problems.

[0005] To achieve the above objectives, an esterification reactor for butyl acetate reaction is provided, comprising an esterification reactor body, an opening at the top of the esterification reactor body, a cover plate rotatably connected to a first region of the opening for closing the first region, a drive box for accommodating transmission components fixedly connected above a second region of the opening, a motor for providing rotational driving force fixedly connected to the outside of the drive box, and a stirring shaft one and a stirring shaft two arranged in a nested manner rotatably connected to the inside of the drive box, the output end of the motor being drivenly connected to the stirring shaft one, both the stirring shaft one and the stirring shaft two extending through into the internal cavity of the esterification reactor body, and the stirring shaft coaxially passing through the inside of the stirring shaft two to achieve coaxial dual-speed rotational stirring; The drive box is equipped with a power diversion mechanism for diverting the power of the motor to the first stirring shaft and the second stirring shaft. The power diversion mechanism includes a pulley 1 fixedly mounted on the first stirring shaft, a rotating shaft rotatably mounted inside the drive box, and a pulley 2 and a gear 2 fixedly mounted on the rotating shaft. A belt for transmitting power is sleeved between the pulley 1 and the pulley 2. A gear 1 is fixedly mounted on the second stirring shaft, and the gear 1 and the gear 2 mesh with each other.

[0006] According to the esterification reactor for butyl acetate reaction, a plurality of stirring blades for shearing and mixing the materials inside the reactor are fixedly connected to a section of the stirring shaft located inside the esterification reactor body.

[0007] According to the esterification reactor for butyl acetate reaction, the stirring shaft is fixedly connected to a stirring frame that rotates synchronously with it in the section located inside the esterification reactor body. The outer edge of the stirring frame is fixedly connected to a scraper for adhering to the reactor wall to remove adhering substances, and the inner edge of the stirring frame is fixedly connected to a stirring rod for disturbing the flow of materials to enhance the mixing effect.

[0008] According to the esterification reactor for butyl acetate reaction, a fixing member is fixedly provided on the outer wall of the esterification reactor body, and a barb is fixedly provided on the side of the cover plate corresponding to the fixing member. A rotating member is rotatably connected to the fixing member, and a U-shaped locking rod for engaging and locking with the barb and a handle for controlling the movement of the rotating member are respectively rotatably connected to the rotating member. The U-shaped locking rod and the barb are adapted to engage to achieve a pressure seal between the cover plate and the opening.

[0009] According to the esterification reactor for butyl acetate reaction, a discharge pipe for discharging reaction products is provided through the middle of the bottom side of the esterification reactor body, and a support for providing support height is fixedly connected to the bottom outer edge of the esterification reactor body.

[0010] According to the esterification reactor for butyl acetate reaction, a feed pipe for introducing reaction raw materials and an exhaust pipe for balancing the gas pressure inside the reactor are respectively provided through the second region of the opening above the esterification reactor body.

[0011] According to the esterification reactor for butyl acetate reaction, the outline of the stirring rack is adapted to the inner wall outline of the esterification reactor body, and the scraper is arranged along the rotational circumference of the stirring rack and always maintains a sliding contact state with the inner wall of the reactor body.

[0012] According to the esterification reactor for butyl acetate reaction, the stirring rod is disposed in the inner middle region of the stirring frame, and the stirring rod is staggered in axial height from the stirring area where the stirring blade is located.

[0013] According to the esterification reactor for butyl acetate reaction, the second stirring shaft is a hollow tubular structure, the first stirring shaft passes through the hollow tube, and the two are supported by bearings to achieve independent relative rotation.

[0014] According to the esterification vessel for butyl acetate reaction, the outer peripheral wall of the esterification vessel body is further covered with a heat exchange jacket structure for regulating the reaction temperature inside the vessel.

[0015] The above-mentioned solution has the following beneficial effects: 1. This invention achieves coaxial bidirectional independent stirring by setting up a coaxial nested double stirring shaft and a power diversion mechanism, driven by a single motor, which effectively eliminates the mixing dead zone and improves the mass and heat transfer efficiency and mixing uniformity of the esterification reaction; at the same time, the cooperation between the scraper and the stirring rod on the stirring rack can not only remove the deposits on the reactor wall in real time to prevent adhesion and coking, but also further disrupt the material flow direction to enhance the mixing effect. 2. This invention features a partitioned layout at the opening of the esterification reactor body. The cover is placed in the first area for opening during cleaning and maintenance, while the feed pipe, exhaust pipe, and drive box are placed in the second area to meet the closed operation requirements of normal production. This ensures both the continuity and safety of production operations and facilitates thorough cleaning of the equipment's interior. Furthermore, the locking and sealing structure, composed of a fixing component, a rotating component, a U-shaped locking rod, a barb, and a handle, allows operators to quickly open and close the cover and reliably seal it simply by operating the handle, simplifying the operation process and improving the ease of use of the equipment.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1 This is a schematic diagram of the overall structure of an esterification reactor for butyl acetate reaction according to the present invention. Figure 2 This is a cross-sectional view of an esterification reactor for butyl acetate reaction according to the present invention. Figure 3 This is a schematic diagram of the stirring assembly of an esterification reactor for butyl acetate reaction according to the present invention. Figure 4 This invention relates to an esterification reactor for the reaction of butyl acetate. Figure 1 A schematic diagram of the structure of A in the middle.

[0018] Legend: 1. Esterification reactor body; 2. Support frame; 3. Discharge pipe; 4. Feed pipe; 5. Drive box; 6. Motor; 7. Exhaust pipe; 8. Stirring rack; 9. Scraper; 10. Stirring rod; 11. Stirring blade; 12. Cover plate; 13. Stirring shaft one; 14. Gear one; 15. Stirring shaft two; 16. Pulley one; 17. Belt; 18. Pulley two; 19. Rotating shaft; 20. Gear two; 21. Bar; 22. Rotating component; 23. Handle; 24. Fixing component; 25. U-shaped locking rod. Detailed Implementation

[0019] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0020] Reference Figure 1 and Figure 2 This invention provides an esterification reactor for butyl acetate reaction, comprising an esterification reactor body 1, which serves as the core container for containing butyl acetate reactants and carrying out the esterification reaction. A support 2 is fixedly connected to the bottom outer edge of the esterification reactor body 1 to provide support height and maintain a certain distance between the reactor body and the ground. At least three supports 2 are provided and are circumferentially distributed at equal angles at the bottom of the esterification reactor body 1 to ensure stability. A discharge pipe 3 for discharging reaction products is provided through the center of the bottom side of the esterification reactor body 1, and a valve assembly for controlling the discharge flow is connected in series in the discharge pipe 3.

[0021] An opening is provided on the top of the esterification reactor body 1, which is divided into a first region and a second region. A cover plate 12 is rotatably connected to the first region to close the region, maintaining the reactor's airtightness or facilitating opening and maintenance. The cover plate 12 covers a smaller area than the second region, meaning it only occupies a portion of the opening. A drive housing 5 is fixedly connected above the second region of the opening to house and protect internal transmission components. The drive housing 5 is fixed to the upper surface of the esterification reactor body 1 by bolts or welding. A motor 6, providing rotational driving force, is fixedly connected to the outside of the drive housing 5, with the output shaft of the motor 6 extending into the drive housing 5.

[0022] The second region of the opening above the esterification reactor body 1 is provided with a feed pipe 4 for introducing reaction raw materials and an exhaust pipe 7 for balancing the gas pressure inside the reactor and discharging the gas generated by the reaction. Both the feed pipe 4 and the exhaust pipe 7 are connected to the inside of the reactor cavity.

[0023] Reference Figure 2 and Figure 3 The drive housing 5 has a rotatably connected inner side to a first stirring shaft 13 and a second stirring shaft 15 arranged in a nested configuration. Specifically, the second stirring shaft 15 is a hollow tubular structure, and the first stirring shaft 13 is coaxially inserted inside the second stirring shaft 15. The two are supported by bearings installed in the gap between them, allowing for independent relative rotation. The output end of the motor 6 is connected to the upper end of the first stirring shaft 13, thereby driving the first stirring shaft 13 to rotate around its own axis. Both the first stirring shaft 13 and the second stirring shaft 15 penetrate the bottom plate of the drive housing 5 and extend into the internal cavity of the esterification reactor body 1 to apply a stirring action to the materials inside the reactor.

[0024] Inside the drive housing 5, a power splitting mechanism is provided to divert the single power output from the motor 6 to the first stirring shaft 13 and the second stirring shaft 15. This power splitting mechanism includes a pulley 16 fixedly mounted on the section of the first stirring shaft 13 located inside the drive housing 5, a rotating shaft 19 rotatably mounted on the other end of the drive housing 5, and a second pulley 18 and a second gear 20 fixedly mounted on the rotating shaft 19. A belt 17 for transmitting rotational power is fitted between the first pulley 16 and the second pulley 18. A gear 14 is fixedly mounted on the section of the second stirring shaft 15 located inside the drive housing 5. This gear 14 meshes with the second gear 20 on the rotating shaft 19 to transmit power from the rotating shaft 19 to the second stirring shaft 15.

[0025] Therefore, when motor 6 drives stirring shaft 13 and pulley 16 to rotate, stirring shaft 13 directly drives the lower stirring component to rotate, and pulley 18 and shaft 19 to rotate synchronously via belt 17. Gear 20 on shaft 19 then drives stirring shaft 15 to rotate through meshing with gear 14. Stirring shaft 13 and stirring shaft 15 achieve bidirectional independent rotational stirring under coaxial nesting, effectively enhancing the disturbance and mixing effect of materials in the vessel.

[0026] A number of stirring blades 11 for shearing and mixing the materials in the reactor are fixedly connected to the section of the stirring shaft 13 located inside the esterification reactor body 1. The stirring blades 11 are distributed along the axial and / or radial direction of the stirring shaft 13, and their shape can be conventional stirring forms such as straight blades, oblique blades or spiral blades.

[0027] A stirring frame 8, which rotates synchronously with the stirring shaft 15, is fixedly connected to the section located inside the esterification vessel body 1. The overall outline of the stirring frame 8 is adapted to the inner wall outline of the esterification vessel body 1, and is usually U-shaped or frame-shaped. A scraper 9 for scraping off adhering materials by adhering to the vessel wall is fixedly connected to the outer edge of the stirring frame 8. The scraper 9 is arranged along the circumferential rotation of the stirring frame 8 and maintains sliding contact with the inner wall of the esterification vessel body 1 during rotation, thereby effectively preventing the reactants from sticking or coking on the vessel wall. A stirring rod 10 for disrupting the flow of materials to enhance the mixing effect is fixedly connected to the inner edge of the stirring frame 8, i.e., the side near the rotation area of ​​the stirring shaft 13. The stirring rod 10 is staggered in axial height from the stirring area where the stirring blade 11 is located, avoiding motion interference and forming a more complex flow field inside the vessel, thereby improving mass and heat transfer efficiency.

[0028] Reference Figure 4 A fixing member 24 is fixedly installed on the outer wall of the esterification reactor body 1, and a barb 21 is fixedly installed on one side edge of the cover plate 12 corresponding to the fixing member 24. A rotating member 22 is rotatably connected to the fixing member 24, and the rotation axis of the rotating member 22 is parallel to the mounting surface of the fixing member 24. A U-shaped locking rod 25 for engaging and locking with the barb 21 and a handle 23 for controlling the movement of the rotating member 22 are respectively rotatably connected to the rotating member 22. Specifically, the open end of the U-shaped locking rod 25 is hinged to the eccentric position of the rotating member 22, and an movable gap is reserved between the barb 21 and the fixing member 24 for the U-shaped locking rod 25 to wedge into. When the operator turns handle 23 to rotate the rotating component 22 towards the cover plate 12, the front crossbar of the U-shaped locking rod 25 passes over the hook of the barb 21. Subsequently, under the action of the reverse torque, the U-shaped locking rod 25 is embedded in the hook groove of the barb 21 and generates pre-tightening pressure, thereby achieving a tight seal between the cover plate 12 and the edge of the first area of ​​the opening. When it is necessary to open the cover plate 12, turning handle 23 in the opposite direction will release the lock.

[0029] When cleaning or maintenance of the esterification reactor is required, the operator only needs to pull handle 23 to unlock cover 12, flipping it open to expose the first area of ​​the opening. This allows cleaning equipment or the operator's arm to easily enter the reactor cavity for thorough cleaning of the stirring components and reactor walls, avoiding the drawbacks of incomplete cleaning via feed pipe 4. During normal production, cover 12 remains tightly closed, and both reactants and products are transported through dedicated feed pipe 4 and discharge pipe 3, ensuring the airtightness and safety of the production process.

[0030] Working principle: During the butyl acetate reaction, the esterification reactor body 1 is in a closed state. The raw material is quantitatively introduced into the reactor cavity through the feed pipe 4 located in the second area of ​​the opening. The volatile gases generated during the reaction are discharged through the exhaust pipe 7 to maintain the pressure balance inside the reactor. The motor 6 is started, and its output drives the stirring shaft 13 to rotate. The stirring shaft 13 drives the pulley 16 fixed thereon and several stirring blades 11 located in the vessel cavity to rotate synchronously, performing shearing and mixing on the material inside the vessel. At the same time, the pulley 16 transmits power to the pulley 18 through the belt 17, driving the rotating shaft 19 and the gear 20 fixed thereon to rotate. The gear 20 transmits power to the stirring shaft 15 through meshing with the gear 14, thereby driving the stirring shaft 15 to rotate independently and driving the stirring frame 8 fixed thereon to move synchronously. During this power transmission process, the stirring shaft 13 and the stirring shaft 15 are coaxially nested and driven by the power diversion mechanism respectively, realizing coaxial bidirectional stirring. The stirring rod 10 set on the inner edge of the stirring frame 8 disturbs the flow of material to enhance the mixing effect, and the scraper 9 set on the outer edge of the stirring frame 8 rotates against the inner wall of the vessel to continuously remove the reaction material adhering to the wall. After the reaction is completed, the valve assembly set on the discharge pipe 3 is opened to discharge the product. When it is necessary to clean or maintain the inside of the esterification reactor body 1, the operator can turn the handle 23 to rotate the rotating part 22, so that the U-shaped locking rod 25 is disengaged from the hook 21, and the cover plate 12 can be flipped open to expose the first area of ​​the opening, allowing personnel or equipment to enter for operation.

[0031] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. An esterification vessel for butyl acetate reaction, comprising an esterification vessel body (1), characterized in that, An opening is provided above the esterification reactor body (1). A cover plate (12) for closing the first area of ​​the opening is rotatably connected to the first area. A drive box (5) for accommodating transmission components is fixedly connected above the second area of ​​the opening. A motor (6) for providing rotational driving force is fixedly connected to the outside of the drive box (5). A stirring shaft one (13) and a stirring shaft two (15) arranged in a nested manner are rotatably connected to the inside of the drive box (5). The output end of the motor (6) is connected to the stirring shaft one (13) for transmission. Both the stirring shaft one (13) and the stirring shaft two (15) extend through into the internal cavity of the esterification reactor body (1). The stirring shaft one (13) is coaxially inserted into the inside of the stirring shaft two (15) to achieve coaxial bidirectional rotational stirring. The drive box (5) is provided with a power diversion mechanism for diverting the power of the motor (6) to the stirring shaft one (13) and the stirring shaft two (15). The power diversion mechanism includes a pulley one (16) fixedly mounted on the stirring shaft one (13), a rotating shaft (19) rotatably mounted inside the drive box (5), and a pulley two (18) and a gear two (20) fixedly mounted on the rotating shaft (19). A belt (17) for transmitting power is sleeved between the pulley one (16) and the pulley two (18). A gear one (14) is fixedly mounted on the stirring shaft two (15), and the gear one (14) and the gear two (20) mesh with each other.

2. The esterification reactor for butyl acetate reaction according to claim 1, characterized in that, The stirring shaft (13) is fixedly connected to a number of stirring blades (11) for shearing and mixing the materials in the reactor on the section inside the esterification reactor body (1).

3. The esterification reactor for butyl acetate reaction according to claim 1, characterized in that, The stirring shaft 2 (15) is fixedly connected to a stirring frame (8) that rotates synchronously with it on the section inside the esterification vessel body (1). The outer edge of the stirring frame (8) is fixedly connected to a scraper (9) for adhering to the vessel wall to scrape off the attached material. The inner edge of the stirring frame (8) is fixedly connected to a stirring rod (10) for disturbing the flow of material to enhance the mixing effect.

4. The esterification reactor for butyl acetate reaction according to claim 1, characterized in that, A fixing member (24) is fixedly provided on the outer side wall of the esterification reactor body (1). A barb (21) is fixedly provided on one side of the cover plate (12) corresponding to the fixing member (24). A rotating member (22) is rotatably connected to the fixing member (24). A U-shaped locking rod (25) for hooking and locking with the barb (21) and a handle (23) for controlling the movement of the rotating member (22) are respectively rotatably connected to the rotating member (22). The U-shaped locking rod (25) and the barb (21) are adapted to hook and engage to achieve a tight seal between the cover plate (12) and the opening.

5. The esterification reactor for butyl acetate reaction according to claim 1, characterized in that, The bottom side of the esterification reactor body (1) is provided with a discharge pipe (3) for discharging reaction products, and the bottom outer edge of the esterification reactor body (1) is fixedly connected with a support (2) for providing support height.

6. The esterification reactor for butyl acetate reaction according to claim 1, characterized in that, The second region of the opening above the esterification reactor body (1) is respectively provided with a feed pipe (4) for introducing reaction raw materials and an exhaust pipe (7) for balancing the gas pressure inside the reactor.

7. The esterification reactor for butyl acetate reaction according to claim 1, characterized in that, The outline of the stirring rack (8) is adapted to the inner wall outline of the esterification vessel body (1), and the scraper (9) is arranged along the rotational circumference of the stirring rack (8) and always maintains a sliding contact state with the inner wall of the vessel.

8. The esterification reactor for butyl acetate reaction according to claim 1, characterized in that, The stirring rod (10) is located in the inner middle area of ​​the stirring frame (8), and the stirring rod (10) is staggered from the stirring area where the stirring blade (11) is located in the axial height.

9. The esterification reactor for butyl acetate reaction according to claim 1, characterized in that, The stirring shaft 2 (15) is a hollow tubular structure, and the stirring shaft 1 (13) is inserted inside the hollow tube. The two are supported by bearings to achieve independent relative rotation.

10. An esterification reactor for butyl acetate reaction according to claim 1, characterized in that, The outer peripheral wall of the esterification vessel body (1) is also covered with a heat exchange jacket structure for regulating the reaction temperature inside the vessel.

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