An apparatus for preparing acetoxyisobutyryl chloride
By combining transverse mechanical stirring and gas stirring in the acetoxyisobutyryl chloride preparation equipment, the problem of uneven material mixing was solved, achieving a highly efficient and uniform reaction process and improving the yield and purity of the product.
Patent Information
- Application Number
- CN202522297640.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-30
- Publication Date
- 2026-11-06
- Estimated Expiration
- 2035-10-30
AI Technical Summary
Existing equipment for preparing acetoxyisobutyryl chloride suffers from a lack of a single stirring device, resulting in uneven material mixing, incomplete reaction, and reduced product yield and purity.
The mixing method combines horizontal mechanical stirring and gas stirring. The hollow stirring shaft drives the stirring blades to rotate to achieve horizontal mechanical stirring, and the gas is ejected through the L-shaped round tube jet hole to form vertical convection, thus achieving multi-dimensional mixing that combines horizontal and vertical mixing.
This significantly improves the uniformity and efficiency of raw material mixing, ensures a complete reaction, and increases product yield and purity.
Smart Images
Figure CN224938191U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of acetoxyisobutyryl chloride preparation technology, specifically to an acetoxyisobutyryl chloride preparation device. Background Technology
[0002] Acetoxyisobutyryl chloride, as an important organic synthesis intermediate, is widely used in pharmaceuticals, pesticides, and polymer materials. In the pharmaceutical field, it can be used to synthesize key active ingredients such as antibiotics and anti-inflammatory drugs. In the pesticide field, it is an important raw material for preparing highly efficient and low-toxicity insecticides and herbicides. In the polymer materials field, it can participate in the polymerization reaction of resins, coatings, and other products to improve product performance. With the continuous growth of downstream industries' demand for high-quality and high-purity acetoxyisobutyryl chloride, the efficiency, safety, and product quality control of its preparation process have received increasing attention from the industry. Efficient and stable preparation equipment has become a key support for promoting the large-scale production of this intermediate. Currently, the preparation of acetoxyisobutyryl chloride mostly adopts the acyl chlorination reaction process. Existing preparation equipment usually takes a reactor as the core, equipped with basic components such as feeding, stirring, temperature control, and discharge. During operation, isobutyric acid, acetic anhydride, and other raw materials are first added to the reactor in proportion through the feeding device, followed by the addition of a chlorinating agent (such as phosphorus trichloride, phosphorus pentachloride, etc.) to initiate the reaction. During the reaction, the materials are mixed by the stirring device inside the reactor, and hot or cold water is circulated through the jacket outside the reactor to adjust the reaction temperature and maintain the reaction within a suitable range. The acetoxyisobutyryl chloride product generated by the reaction is discharged through the bottom discharge valve after the reaction is completed, completing one preparation cycle. However, existing preparation equipment has obvious shortcomings in practical applications. Most of the stirring devices are single paddle structures, which can only achieve lateral stirring of materials. This can easily lead to uneven mixing of materials in some parts of the vessel, resulting in insufficient reaction of raw materials. This not only reduces the product yield but may also produce by-products that affect the purity of the product. Therefore, we propose an acetoxyisobutyryl chloride preparation device. Utility Model Content
[0003] The technical problem to be solved by this utility model is to overcome the existing defects and provide an acetoxyisobutyryl chloride preparation device. By using a combination of horizontal and vertical mixing methods of "horizontal mechanical stirring + gas stirring", the problems in the background technology can be effectively solved.
[0004] To achieve the above objectives, the present invention provides the following technical solution: an acetoxyisobutyryl chloride preparation device, comprising a shell, a jacket fixedly connected to the outer arc surface of the shell, a partition fixedly connected to the upper end of the inner side of the shell, a feed pipe fixedly connected to the feed inlet of the partition, the upper end of the feed pipe penetrating the upper side wall of the shell, a drain valve provided on the upper side of the outer arc surface of the shell, and a mixing mechanism. The mixing mechanism includes a hollow stirring shaft, stirring blades, an L-shaped tube, jet holes, and an L-shaped gas pipe. The hollow stirring shaft is rotatably connected to the middle of the partition plate. The stirring blades are fixedly connected to the lower side of the outer arc surface of the hollow stirring shaft. The L-shaped gas pipe is fixedly connected to the top wall of the hollow stirring shaft. The right end of the outer arc surface of the L-shaped tube is rotatably connected to the lower side of the outer arc wall of the hollow stirring shaft. The right end of the L-shaped tube and the lower end of the L-shaped gas pipe are fitted together. The jet holes are evenly opened on the outer arc wall of the left end of the L-shaped tube. The mixing uniformity and efficiency of the raw materials are greatly improved by the combination of "transverse mechanical stirring + gas stirring".
[0005] Furthermore, a microcontroller is provided on the right side of the housing, and the input terminal of the microcontroller is electrically connected to an external power supply for stable control.
[0006] Furthermore, the mixing mechanism also includes a rotary joint, through which the right end of the L-shaped tube is connected to the lower end of the L-shaped gas tube, and the gas is constantly transmitted when the L-shaped tube rotates.
[0007] Furthermore, the mixing mechanism also includes a gear and a rack plate. The gear is fixedly connected to the outer arc surface of the right end of the L-shaped tube. The top wall of the hollow stirring shaft is slidably connected to the rack plate via a slide rod. The rack plate meshes with the gear. A limit plate is fixedly connected to the upper side of the hollow stirring shaft. A tightening screw is threadedly connected to the rear side of the limit plate. The front end of the tightening screw contacts the rear side of the slide rod to adjust the angle.
[0008] Furthermore, the mixing mechanism also includes an air inlet pipe, which is fixedly connected to the upper side of the hollow stirring shaft and connected to the upper end of the L-shaped air pipe, serving as an external gas inlet.
[0009] Furthermore, a driven gear is fixedly connected to the upper end of the outer arc surface of the hollow stirring shaft, and a large gear is rotatably connected to the top wall of the outer shell through a rotating shaft. The large gear meshes with the driven gear. A motor is installed on the upper side of the outer shell, and the output shaft of the motor is fixedly connected to the center of the upper end face of the rotating shaft. The input end of the motor is electrically connected to the output end of the microcontroller for stable driving.
[0010] Furthermore, a discharge valve is connected in series in the middle of the material discharge pipe at the lower end of the outer shell. The input end of the discharge valve is electrically connected to the output end of the microcontroller for discharging materials.
[0011] Furthermore, the lower end of the outer arc surface of the housing is provided with uniformly distributed temperature sensors, all of which are bidirectionally electrically connected to the microcontroller to detect the temperature in real time.
[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: This acetoxyisobutyryl chloride preparation equipment has the following advantages: The mixing mechanism of this acetoxyisobutyryl chloride preparation equipment can achieve multi-dimensional and efficient mixing. It achieves horizontal mechanical stirring by rotating the stirring blades through the hollow stirring shaft, breaking up the material stratification. It also uses L-shaped round tube jet holes to spray gas to form vertical convection. The combination of horizontal and vertical mixing methods greatly improves the uniformity and efficiency of raw material mixing. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a structural schematic diagram showing a cross-section of the outer casing of this utility model; Figure 3 This is a schematic diagram of the structure of the right side plane of the outer shell of this utility model; Figure 4 This is an enlarged structural schematic diagram of point A of this utility model; Figure 5 This is a partial structural schematic diagram of the hollow stirring shaft of this utility model; Figure 6 This is an enlarged structural schematic diagram of section B of this utility model.
[0014] In the diagram: 1. Outer shell, 2. Mixing mechanism, 21. Hollow stirring shaft, 22. Stirring blade, 23. L-shaped tube, 24. Jet nozzle, 25. L-shaped air pipe, 26. Air inlet pipe, 27. Rotary joint, 28. Gear, 29. Rack plate, 3. Slide rod, 4. Limiting plate, 5. Partition plate, 6. Feed pipe, 7. Drain valve, 8. Jacket, 9. Motor, 10. Temperature sensor, 11. Discharge valve, 12. Microcontroller, 13. Driven gear, 14. Large gear. Detailed Implementation
[0015] 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.
[0016] Please see Figure 1-6This embodiment provides a technical solution: an acetoxyisobutyryl chloride preparation device, including a shell 1, a microcontroller 12 on the right side of the shell 1, the input terminal of the microcontroller 12 being electrically connected to an external power source, a jacket 8 fixedly connected to the outer arc surface of the shell 1 (an inlet pipe is fixedly connected to the inlet of the jacket 8, and a outlet pipe is fixedly connected to the outlet of the jacket 8), a partition 5 fixedly connected to the upper end of the interior of the shell 1, a feed pipe 6 fixedly connected to the feed inlet of the partition 5, the upper end of the feed pipe 6 penetrating the upper side wall of the shell 1, a drain valve 7 provided on the upper side of the outer arc surface of the shell 1, a discharge valve 11 connected in series in the middle of the material discharge pipe at the lower end of the shell 1, the input terminal of the discharge valve 11 being electrically connected to the output terminal of the microcontroller 12, and uniformly distributed temperature sensors 10 provided at the lower end of the outer arc surface of the shell 1, the temperature probes of the temperature sensors 10 extending into the shell 1. Inside, temperature sensors 10 are bidirectionally electrically connected to microcontroller 12. If excess gas (such as hydrogen chloride) is generated during the reaction, it can be discharged through the drain valve 7 on the upper side of the outer shell 1 to avoid excessive pressure inside the shell. During this process, the temperature sensor 10 on the outer arc surface of the outer shell 1 monitors the temperature of the reaction system inside the shell in real time and transmits the data to microcontroller 12. If the temperature is lower than the preset value, hot water or steam can be introduced through the inlet pipe of the jacket 8 to raise the system temperature through heat exchange between the jacket 8 and the outer shell 1. If the temperature is higher than the preset value, cold water can be introduced through the inlet pipe of the jacket 8 to lower the temperature through heat exchange between the jacket 8 and the outer shell 1. After the reaction is completed, microcontroller 12 controls the discharge valve 11 on the material discharge pipe at the lower end of the outer shell 1 to open, and the acetoxyisobutyryl chloride product flows out along the material discharge pipe to complete the collection. It also includes a mixing mechanism 2. Mixing mechanism 2: It includes a hollow stirring shaft 21, stirring blades 22, an L-shaped tube 23, jet holes 24, and an L-shaped air pipe 25. The hollow stirring shaft 21 is rotatably connected to the middle of the partition plate 5 (the hollow stirring shaft 21 is rotatably connected to the middle of the partition plate 5 through a sealed bearing). The uniformly distributed stirring blades 22 are fixedly connected to the lower side of the outer arc surface of the hollow stirring shaft 21. The L-shaped air pipe 25 is fixedly connected to the top wall of the hollow stirring shaft 21. The right end of the outer arc surface of the L-shaped tube 23 is rotatably connected to the lower side of the outer arc wall of the hollow stirring shaft 21 (the right end of the outer arc surface of the L-shaped tube 23 and the lower side of the outer arc wall of the hollow stirring shaft 21 are rotatably connected through a first sealed bearing). The right end of the L-shaped tube 23 is matched with the lower end of the L-shaped air pipe 25 (the lower end of the outer shell 1 is provided with an observation window, which can observe the angle of the left end of the L-shaped tube 23). The jet holes 24 are evenly opened on the outer arc wall of the left end of the L-shaped tube 23. The mixing mechanism 2 also includes a rotary joint 27, through which the right end of the L-shaped tube 23 is connected to the lower end of the L-shaped air tube 25. The mixing mechanism 2 also includes an air inlet pipe 26, which is fixedly connected to the upper side of the hollow stirring shaft 21 and connected to the upper end of the L-shaped air tube 25. The central axis of the air inlet pipe 26 coincides with the central axis of the hollow stirring shaft 21. The mixing mechanism 2 also includes a gear 28 and a rack plate 29. The gear 28 is fixedly connected to the outer arc surface of the right end of the L-shaped tube 23. The rack plate 29 is slidably connected to the top wall of the hollow stirring shaft 21 via a slide rod 3. The rack plate 29 meshes with the gear 28. A limit plate 4 is fixedly connected to the upper side of the hollow stirring shaft 21. A tightening screw is threaded to the rear side of the limit plate 4. The front end of the tightening screw contacts the rear side of the slide rod 3. (The upper side wall of the outer casing 1 is provided with an adjustment chamber, and the rear of the adjustment chamber...) The regulating door is hinged to the end via a hinge. A rubber sealing strip is provided at the edge of the regulating door. A locking mechanism is installed between the regulating door and the regulating chamber. This locking mechanism is a commonly used push-button spring latch lock, which mainly consists of a fixed end and a movable end. The fixed end is a "U-shaped latch seat" welded to the side wall of the regulating chamber. The movable end is an "L-shaped latch rod" (with a spring nested in the middle of the rod and an arc-shaped protrusion at the end that matches the latch groove) hinged to the end of the regulating door via a pivot. When the regulating door is closed, press the L-shaped latch rod. The arc-shaped protrusion at its end will be inserted into the slot of the U-shaped latch seat under the action of the spring force, thus locking the door. When opening, pull the end of the L-shaped latch rod outward to compress the spring and disengage the protrusion from the slot, so that the regulating door can be easily opened. (The outer arc surface of the air inlet pipe 26 is rotatably connected to the top wall of the regulating chamber through the second sealed bearing. The output pipe of the external air pump can be connected to the upper end of the air inlet pipe 26 through the external rotary joint.) The gear 28 and the rack plate 29 are located inside the sealed space inside the hollow stirring shaft 21. If it is necessary to adjust the coverage of the gas stirring, the regulating door of the regulating chamber at the top of the equipment can be opened, the top screw on the limit plate 4 can be loosened, and the slide rod 3 can be pushed to drive the rack plate 29 to slide up and down. The rack plate 29 meshes with the gear 28 at the right end of the L-shaped tube 23, driving the L-shaped tube 23 to rotate until the angle of the jet hole 24 meets the mixing requirements. Then tighten the top screw to fix the position, flexibly adapting to the mixing requirements of different reaction stages. A driven gear 13 is fixedly connected to the upper end of the outer arc surface of the hollow stirring shaft 21. A large gear 14 is rotatably connected to the top wall of the outer shell 1 via a rotating shaft. The large gear 14 meshes with the driven gear 13. A motor 9 is installed on the upper side of the outer shell 1. The output shaft of the motor 9 is fixedly connected to the center of the upper end face of the rotating shaft. The input end of the motor 9 is electrically connected to the output end of the microcontroller 12. The driven gear 13 and the large gear 14 are located inside the sealed space formed between the upper side of the partition 5 and the top wall of the outer shell 1. Raw materials are injected into the interior of the outer shell 1 through the feed pipe 6. Then, the external sealing cap is threaded to the upper end of the feed pipe 6. Next, the microcontroller 12 controls the motor 9 to operate. The output shaft of the motor drives the large gear 14 to rotate. The large gear 14 meshes with the driven gear 13, thereby driving the hollow stirring shaft. When the hollow stirring shaft 21 rotates, the stirring blades 22 on its outer arc surface rotate synchronously, mechanically stirring the raw materials inside the shell, breaking up the material stratification, and achieving preliminary mixing. An external air pump (which needs to be configured separately) delivers inert gas (such as nitrogen to avoid reaction with acyl chloride raw materials) to the L-shaped air pipe 25 inside the hollow stirring shaft 21 through the air inlet pipe 26 at the top of the equipment. The gas flows downward through the L-shaped air pipe 25 and enters the L-shaped round pipe 23 through the rotary joint 27 (to ensure that the gas does not leak when the L-shaped round pipe 23 rotates). Finally, the gas is evenly sprayed out from the jet hole 24 on the outer arc wall at the left end of the L-shaped round pipe 23. As the bubbles rise, they drive the surrounding materials to form longitudinal convection, forming a "crisscrossing" mixing flow field with the transverse mechanical stirring of the stirring blades 22.
[0017] The working principle of the acetoxyisobutyryl chloride preparation device provided by this utility model is as follows: Raw materials are injected into the interior of the outer shell 1 through the feed pipe 6. Then, the external sealing cap is threadedly connected to the upper end of the feed pipe 6. Next, the microcontroller 12 controls the motor 9 to operate. The motor output shaft drives the large gear 14 to rotate. The large gear 14 meshes with the driven gear 13, thereby driving the hollow stirring shaft 21 to rotate. When the hollow stirring shaft 21 rotates, its outer arc-shaped stirring blades 22 rotate synchronously, mechanically stirring the raw materials inside the shell, breaking up material stratification, and achieving preliminary mixing. An external air pump... (Additional configuration required) Inert gas (such as nitrogen, to avoid reaction with acyl chloride raw materials) is delivered through the air inlet pipe 26 at the top of the equipment to the L-shaped gas pipe 25 inside the hollow stirring shaft 21. The gas flows downward through the L-shaped gas pipe 25 and enters the L-shaped circular pipe 23 through the rotary joint 27 (ensuring no gas leakage when the L-shaped circular pipe 23 rotates). Finally, the gas is evenly ejected from the jet hole 24 on the outer arc wall of the left end of the L-shaped circular pipe 23. As the bubbles rise, they drive the surrounding materials to form longitudinal convection, creating a "crisscrossing" mixing flow field with the transverse mechanical stirring of the stirring blades 22. To adjust the gas mixing coverage, open the adjustment door of the top adjustment chamber of the equipment, loosen the tightening screw on the limit plate 4, and push the slide rod 3 to drive the rack plate 29 to slide up and down. The rack plate 29 meshes with the gear 28 at the right end of the L-shaped tube 23, driving the L-shaped tube 23 to rotate until the angle of the jet hole 24 meets the mixing requirements. Then tighten the tightening screw to fix the position, flexibly adapting to the mixing requirements of different reaction stages. If excess gas (such as hydrogen chloride) is generated during the reaction, it can be discharged directionally through the drain valve 7 on the upper side of the outer shell 1 to avoid excessive pressure inside the shell. Temperature sensor 10 on the outer arc surface of shell 1 monitors the temperature of the reaction system inside the shell in real time and transmits the data to microcontroller 12. If the temperature is lower than the preset value, hot water or steam can be introduced through the inlet pipe of jacket 8 to raise the system temperature through heat exchange between jacket 8 and shell 1. If the temperature is higher than the preset value, cold water can be introduced through the inlet pipe of jacket 8 to lower the temperature through heat exchange between jacket 8 and shell 1. After the reaction is completed, microcontroller 12 controls the discharge valve 11 on the material discharge pipe at the lower end of shell 1 to open, and the acetoxyisobutyryl chloride product flows out along the material discharge pipe to complete the collection.
[0018] It is worth noting that the motor 9 disclosed in the above embodiments can be model YE2-100L1-4, the temperature sensor 10 can be a PT100 platinum resistance sensor, the discharge valve 11 can be model Q941F-16P, and the microcontroller 12 can be model STM32F103C8T6. The microcontroller 12 controls the operation of the motor 9, the temperature sensor 10, and the discharge valve 11 using methods commonly used in the prior art.
[0019] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.
Claims
1. An acetoxyisobutyryl chloride preparation device, comprising a shell (1), wherein a jacket (8) is fixedly connected to the outer arc surface of the shell (1), a partition (5) is fixedly connected to the upper end of the inner side of the shell (1), a feed pipe (6) is fixedly connected to the feed inlet of the partition (5), the upper end of the feed pipe (6) penetrates the upper side wall of the shell (1), and a drain valve (7) is provided on the upper side of the outer arc surface of the shell (1), characterized in that: It also includes a hybrid mechanism (2); Mixing mechanism (2): It includes a hollow stirring shaft (21), stirring blades (22), an L-shaped tube (23), a jet hole (24) and an L-shaped air pipe (25). The hollow stirring shaft (21) is rotatably connected to the middle of the partition plate (5). The lower side of the outer arc surface of the hollow stirring shaft (21) is fixedly connected with uniformly distributed stirring blades (22). The L-shaped air pipe (25) is fixedly connected to the top wall of the hollow stirring shaft (21). The right end of the outer arc surface of the L-shaped tube (23) is rotatably connected to the lower side of the outer arc wall of the hollow stirring shaft (21). The right end of the L-shaped tube (23) is matched with the lower end of the L-shaped air pipe (25). The jet hole (24) is evenly opened on the outer arc wall of the left end of the L-shaped tube (23).
2. The acetoxyisobutyryl chloride preparation apparatus according to claim 1, characterized in that: A microcontroller (12) is provided on the right side of the outer casing (1), and the input terminal of the microcontroller (12) is electrically connected to an external power supply.
3. The acetoxyisobutyryl chloride preparation apparatus according to claim 1, characterized in that: The mixing mechanism (2) also includes a rotary joint (27), through which the right end of the L-shaped tube (23) is connected to the lower end of the L-shaped air tube (25).
4. The acetoxyisobutyryl chloride preparation apparatus according to claim 1, characterized in that: The mixing mechanism (2) also includes a gear (28) and a rack plate (29). The gear (28) is fixedly connected to the outer arc surface of the right end of the L-shaped tube (23). The top wall of the hollow stirring shaft (21) is slidably connected to the rack plate (29) through the slide rod (3). The rack plate (29) meshes with the gear (28). The upper side of the hollow stirring shaft (21) is fixedly connected to a limiting plate (4). The rear side of the limiting plate (4) is threaded with a tightening screw. The front end of the tightening screw contacts the rear side of the slide rod (3).
5. The acetoxyisobutyryl chloride preparation apparatus according to claim 1, characterized in that: The mixing mechanism (2) also includes an air inlet pipe (26), which is fixedly connected to the upper side of the hollow stirring shaft (21) and connected to the upper end of the L-shaped air pipe (25).
6. The acetoxyisobutyryl chloride preparation apparatus according to claim 2, characterized in that: A driven gear (13) is fixedly connected to the upper end of the outer arc surface of the hollow stirring shaft (21). A large gear (14) is rotatably connected to the top wall of the outer shell (1) through a rotating shaft. The large gear (14) meshes with the driven gear (13). A motor (9) is installed on the upper side of the outer shell (1). The output shaft of the motor (9) is fixedly connected to the center of the upper end face of the rotating shaft. The input end of the motor (9) is electrically connected to the output end of the microcontroller (12).
7. The acetoxyisobutyryl chloride preparation apparatus according to claim 2, characterized in that: A discharge valve (11) is connected in series in the middle of the material discharge pipe at the lower end of the outer shell (1). The input end of the discharge valve (11) is electrically connected to the output end of the microcontroller (12).
8. The acetoxyisobutyryl chloride preparation apparatus according to claim 2, characterized in that: Temperature sensors (10) are evenly distributed at the lower end of the outer arc surface of the outer shell (1), and the temperature sensors (10) are all bidirectionally electrically connected to the microcontroller (12).