Beckmann rearrangement feeding automatic control reaction device

Abstract

The utility model discloses a Beckmann rearrangement feeding automatic control reaction device, and belongs to the field of organic chemical synthesis production. The reaction device comprises a reaction kettle, a vibration feeding device connected with a feeding port of the reaction kettle and a PLC control system, a stirring device is arranged in the reaction kettle and comprises a motor, a stirring shaft and at least six stirring paddles, and each stirring paddle is provided with a temperature sensor. And the PLC control system is in communication connection with the vibration feeding device, the stirring device and the temperature sensor. In the reaction feeding process, the vibration frequency and amplitude of the feeding device can be automatically controlled according to the temperature in the reaction kettle and a preset value in the PLC system so as to control the feeding speed, and the stability and safety of the reaction are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of vibration feeding and control, in particular to a Beckmann rearrangement feeding automatic control reaction device. Background Art

[0002] Amide compounds, as important intermediates, are widely used in the chemical and pharmaceutical industries. Amide compounds are typically synthesized through the dehydration condensation reaction of organic acids and amines. However, some amides with specialized structures are difficult to prepare using traditional dehydration condensation reactions. In recent years, researchers have shifted their focus to the Beckmann rearrangement reaction to prepare amide compounds with specialized structures, such as caprolactam. The Beckmann rearrangement reaction involves the rearrangement of ketoximes in the presence of acidic catalysts such as phosphorus pentachloride and phosphorus trichloride to form primary and secondary amides.

[0003] The typical Beckmann rearrangement reaction for preparing amides is often accompanied by strong exotherm and side reactions. Accurate temperature and effective mass transfer control are crucial for process safety and the quality of the amide product. Traditional manual control methods often fail to adjust feed rates in a timely and precise manner, which can easily lead to runaway reactions, reduced product quality, and even serious safety issues. Summary of the Invention

[0004] In order to solve the above technical problems, the utility model provides a Beckmann rearrangement feeding automatic control reaction device.

[0005] The utility model is realized through the following technical solutions: a Beckmann rearrangement feeding automatic control reaction device includes a reactor, a vibration feeding device connected to the reactor feed port and a PLC control system, a stirring device is provided inside the reactor, the stirring device includes a motor, a stirring shaft and at least six stirring paddles, each stirring paddle is provided with a temperature sensor, and the PLC control system is communicatively connected to the vibration feeding device, the stirring device and the temperature sensor.

[0006] The sensors are positioned on the stirring blades, taking into account the uniformity of temperature distribution and potential hot spots during the reaction. They are connected to the PLC control system for real-time temperature monitoring and feedback control. High-temperature-resistant, fast-response temperature sensors ensure accurate sensing of temperature changes within the reactor, providing reliable data support for the control system. Each stirring blade is equipped with at least one temperature sensor.

[0007] The vibratory feeder is connected to a PLC control system, which automatically controls the feed. Vibratory feeding is used to force the dry material from the feed pipe into the reactor. Vibration improves material flow, prevents blockages, and promotes uniform material distribution. The frequency and amplitude of the vibration can be adjusted to control the feed rate.

[0008] Some specific technical solutions include a stirring paddle comprising a transverse stirring blade and a longitudinal stirring blade arranged perpendicular to the transverse stirring blade. The transverse stirring blade is detachably connected to the stirring shaft, and the longitudinal stirring blade adopts a spiral ring structure at one end away from the transverse stirring blade.

[0009] In some specific technical solutions, the spiral annular structure is provided with a plurality of spoiler holes, and the spoiler holes adopt a circular, diamond, pentagonal, hexagonal or star-shaped hole structure.

[0010] In some specific technical solutions, at most four longitudinal stirring blades are arranged on the same circumference of the transverse stirring blade.

[0011] In some specific technical solutions, one or two longitudinal stirring blades are arranged on the same circumference of the transverse stirring blades, and the longitudinal stirring blades on adjacent circumferences are arranged in directions perpendicular to each other.

[0012] Some specific technical solutions are as follows: a groove is provided in the middle of the horizontal stirring blade, a temperature sensor is placed in the groove, and a waterproof cover is provided on the end of the groove.

[0013] Some specific technical solutions include sliding the waterproof cover into the connection groove and performing waterproof treatment on the connection.

[0014] In some specific technical solutions, the reactor body is provided with a jacket, and a heat exchange medium is passed through the jacket.

[0015] The PLC control system uses existing technology and is a key component in automating and precisely controlling the feeding process. The PLC control system can adjust the operation of the vibrator according to preset parameters and programs to achieve the required feeding speed and feeding amount.

[0016] If the temperature sensor detects that the temperature in the reactor is outside the set range, the PLC will reduce the feed rate to reduce the reaction rate and stabilize the temperature. Feedback control can ensure that the reaction conditions are always ideal, maximize the efficiency and stability of the reaction, and ensure the safety and reliability of production.

[0017] Beneficial effects of the present invention: The present invention provides a Beckmann rearrangement feeding automatic control reaction device, which includes a reactor, a vibration feeding device connected to the reactor feed port, and a PLC control system. The reactor is provided with a stirring device, which includes a motor, a stirring shaft, and at least six stirring paddles. Each stirring paddle is provided with a temperature sensor, and the PLC control system is communicatively connected to the vibration feeding device, the stirring device, and the temperature sensor. By arranging a temperature sensor on each paddle, during the reaction feeding process, the vibration frequency and amplitude of the feeding device can be automatically controlled according to the temperature in the reactor and the preset value in the PLC system to control the feeding speed, thereby ensuring the smoothness and safety of the reaction. The stirring paddle adopts a detachable connection method, which can prevent the need to replace the entire stirring component due to damage to a sensor. In addition, by making special structural design of the stirring paddle, the reaction can effectively improve mass transfer, reduce the occurrence of side reactions, and improve the reaction quality. At the same time, it is suitable for Beckmann rearrangement reactions of gas, solid, and liquid three-phase reaction materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The diagram is a structural diagram of a Beckmann rearrangement feed automatic control reaction device.

[0019] Figure 2 yes Figure 1 Front view of the stirring paddle.

[0020] Figure 3 yes Figure 2 AA view in.

[0021] In the figure: 1. Reactor, 2. Motor, 3. Stirring shaft, 4. Stirring paddle, 5. Temperature sensor, 6. Vibrating feeding device, 40. Horizontal stirring blade, 41. Vertical stirring blade, 42. Turbine hole, 43. Groove. DETAILED DESCRIPTION

[0022] The technical solution of the present utility model is further described below.

[0023] Figure 1 The schematic diagram of the structure of a Beckmann rearrangement automatic feeding control reaction device is shown. As shown in the figure, the Beckmann rearrangement automatic feeding control reaction device includes a reactor 1, a vibration feeding device 6 connected to the feed port of the reactor 1, and a PLC control system. The reactor 1 is provided with a stirring device inside, which includes a motor 2, a stirring shaft 3, and ten stirring paddles 3. The stirring shaft is connected to the motor, and the stirring paddles are detachably connected to the stirring shaft. Each stirring paddle 3 includes a horizontal stirring blade 40 and a vertical stirring blade 41 arranged perpendicular to the horizontal stirring blade 40. The horizontal stirring blade 40 is threadedly connected to the connecting end of the stirring shaft. Two vertical stirring blades 41 are arranged on the same circumference of the horizontal stirring blade 40, and the longitudinal stirring blades 41 on adjacent circumferences are arranged in a perpendicular direction (such as Figure 2 and 3 As shown), the end of the longitudinal stirring blade 41 away from the transverse stirring blade 40 adopts a spiral ring structure, a groove 43 is provided in the middle of the transverse stirring blade 40, the temperature sensor 5 is placed in the groove 43, the end of the groove 43 is slidably connected to the waterproof cover, the temperature sensor 5 is placed in the groove 43, and the PLC control system is communicatively connected to the vibration feeding device 6, the stirring device and the temperature sensor 5.

[0024] A plurality of flow-turbulating holes are arranged on the spiral ring structure, and the flow-turbulating holes adopt a circular hole structure.

[0025] During the Beckmann rearrangement reaction, temperature sensors on the various stirring blades detect the temperature of the reactants at various locations within the reactor and transmit this temperature data to the controller. After comprehensively analyzing the temperatures at various locations within the reactor, the controller automatically controls feeding device 2 according to preset parameters. If the temperature is too high, the feeding speed of feeding device 2 is reduced, while the stirring speed of the glue stick device is increased to ensure sufficient heat transfer, thereby avoiding accidents caused by excessive temperature and potential safety hazards. If the temperature is too low, the feeding speed is increased, the frequency of feeding is increased, and the stirring speed is appropriately reduced to maintain the reaction temperature within the appropriate range.

[0026] The temperature sensor uses a high-temperature resistant, highly sensitive wireless temperature sensing element, which forms a data transmission path with the control device. Each blade has a wireless temperature sensing element, which allows the wireless temperature sensor to monitor the reaction liquid temperature at different locations and depths in real time.

Claims

1. A Beckmann rearrangement feed automatic control reaction device, comprising a reactor (1), a vibration feed device (6) connected to the feed port of the reactor (1), and a PLC control system, wherein the reactor (1) is provided with a stirring device, and is characterized in that: The stirring device comprises a motor (2), a stirring shaft (3) and at least six stirring paddles (4), each stirring paddle (4) is provided with a temperature sensor (5), and a PLC control system is communicatively connected to the vibration feeding device (6), the stirring device and the temperature sensor (5); The stirring paddle (4) includes a transverse stirring blade (40) and a longitudinal stirring blade (41) arranged perpendicular to the longitudinal stirring blade (41). The transverse stirring blade (40) is detachably connected to the stirring shaft, and the longitudinal stirring blade (41) has a spiral ring structure at one end away from the longitudinal stirring blade (41).

2. The Beckmann rearrangement feed automatic control reaction device according to claim 1, characterized in that: The spiral annular structure is provided with a plurality of flow-turbulating holes, and the flow-turbulating holes adopt a circular, diamond-shaped, pentagonal, hexagonal or star-shaped hole structure.

3. The Beckmann rearrangement feed automatic control reaction device according to claim 2, characterized in that: A maximum of four longitudinal stirring blades (41) are provided on the same circumference of the transverse stirring blade (40).

4. The Beckmann rearrangement feed automatic control reaction device according to claim 2, characterized in that: One or two longitudinal stirring blades (41) are arranged on the same circumference of the transverse stirring blade (40), and the longitudinal stirring blades (41) on adjacent circumferences are arranged in perpendicular directions.

5. The Beckmann rearrangement automatic feed control reaction device according to any one of claims 1 to 4, characterized in that: A groove (43) is provided in the middle of the horizontal stirring blade (40), a waterproof cover is provided on the groove (43), and a temperature sensor (5) is placed in the groove (43).

6. The Beckmann rearrangement feed automatic control reaction device according to claim 5, characterized in that: The waterproof cover is slidably connected to the groove (43).

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