Intelligent temperature control device for producing o-fluorobenzoyl chloride

Abstract

The application discloses an intelligent temperature control device for o-fluorobenzoyl chloride production and belongs to the technical field of reaction kettle temperature control, which comprises a temperature control lining body arranged in a reaction kettle, a continuously electrically heated bottom layer arranged at the bottom of the reaction kettle, a liquid cooling heat dissipation assembly arranged in the temperature control lining body and used for continuously controlling materials in the reaction kettle, a temperature control adjusting main shaft arranged in the reaction kettle, and a temperature measuring assembly arranged at the bottom of the temperature control adjusting main shaft and used for measuring the temperature of the materials at different heights. The temperature measuring assembly arranged at the bottom of the temperature control adjusting main shaft can capture the temperature gradient in the vertical and horizontal directions of the reaction kettle in real time, and the misjudgment caused by single-point temperature measurement is avoided. In combination with a rapid temperature control plate driven by double push linkages, the heat exchange distance and position can be rapidly adjusted according to the actually measured temperature distribution, accurate and uniform temperature control is realized, the side reaction in the production of o-fluorobenzoyl chloride is effectively inhibited, and the product yield and purity are improved.

Description

Technical Field

[0001] This invention relates to the field of reactor temperature control technology, and in particular to an intelligent temperature control device for the production of o-fluorobenzoyl chloride. Background Technology

[0002] o-Fluorobenzoyl chloride is an important organic synthesis intermediate widely used in pharmaceuticals, pesticides, dyes, and fine chemicals. Its production process typically uses o-fluorobenzoic acid or o-fluorobenzonitrile as raw materials, through a chlorination reaction. This reaction process is highly exothermic, and the reaction temperature significantly affects the product yield and purity: excessively high temperatures can easily trigger side reactions (such as hydrolysis, polymerization, or over-chlorination), generating colored impurities or tar; excessively low temperatures result in a slow reaction rate and insufficient conversion. Therefore, precise, rapid, and uniform control of the internal temperature of the reactor throughout the entire production process is crucial to ensuring product quality and production safety.

[0003] Currently, the temperature control devices commonly used in industrial production for reaction vessels mainly include the following types: Jacketed temperature control structure: A jacket is installed on the outer wall of the reactor, through which steam or cooling water is introduced for heating or cooling. This method has a simple structure, but since heat exchange only occurs through the reactor wall, there is a significant temperature gradient. The temperature changes rapidly near the reactor wall, while the temperature response in the center of the reactor lags behind, which can easily lead to local overheating or overcooling, affecting the consistency of the reaction.

[0004] Coil-type temperature control structure: A spiral coil is installed inside the reactor, through which a heat medium or a coolant is introduced. This method has a relatively large heat exchange area, but the coil occupies the effective volume inside the reactor and interferes with the arrangement of the agitator, making cleaning and maintenance difficult; at the same time, scale easily forms on the surface of the coil, reducing heat exchange efficiency.

[0005] Bottom electric heating + natural heat dissipation: This method raises the temperature by setting an electric heating layer at the bottom of the reactor, relying on natural heat dissipation from the reactor body or simple fan cooling. This method has low temperature control accuracy and cannot withstand severe exothermic shocks, making it particularly unsuitable for production scenarios like o-fluorobenzoyl chloride, which require rapid cooling to terminate side reactions.

[0006] Single-point temperature measurement feedback control: One or a few temperature sensors are installed inside the reactor to control the start and stop of the heating or cooling device based on the temperature at the measuring point. Because the temperature distribution of the reactants is not uniform at different heights and radial directions (especially when stirring is insufficient or the viscosity of the materials changes), single-point temperature measurement is difficult to reflect the true temperature field inside the reactor, which can easily lead to errors in temperature control decisions and cause fluctuations in product quality.

[0007] In summary, existing temperature control devices generally suffer from the following technical problems: The temperature response is lag, making it difficult to achieve rapid and abrupt cooling or heating interventions; Uneven temperature distribution, lacking the ability to accurately measure and differentiate the temperature at different heights and radial positions inside the vessel; The heating and cooling functions are relatively independent and have poor coordination, making it impossible to achieve a two-way rapid response of "rapid cooling + rapid heating" under narrow temperature window conditions; Traditional heat exchange structures (jacket, coil) occupy a large space, have low heat exchange efficiency, and are prone to interference with stirring devices.

[0008] Therefore, developing an intelligent temperature control device that can achieve multi-point temperature measurement across the entire area, rapid bidirectional temperature interference, and has a compact structure that does not interfere with stirring is of great practical significance for the efficient, safe, and stable production of o-fluorobenzoyl chloride. Summary of the Invention

[0009] The purpose of this invention is to solve the problems existing in the prior art and to propose an intelligent temperature control device for the production of o-fluorobenzoyl chloride.

[0010] To achieve the above objectives, the present invention adopts the following technical solution: A smart temperature control device for the production of o-fluorobenzoyl chloride includes a temperature control liner installed inside a reactor. A continuously electrically heated bottom layer is provided at the bottom of the reactor. A liquid-cooled heat dissipation component for continuously controlling the materials inside the reactor is installed inside the temperature control liner. A temperature control adjustment spindle is installed inside the reactor. A temperature measuring component for measuring the temperature of the material at different heights is installed at the bottom of the temperature control adjustment spindle. The temperature control adjustment spindle is connected to a rapid temperature control plate via a double-push linkage. A rapid temperature interference component is installed inside the rapid temperature control plate. A temperature-sensing heating device for rapidly heating the material is installed on the double-push linkage.

[0011] As a preferred embodiment, the liquid cooling heat dissipation assembly includes a heat dissipation cavity disposed inside the temperature control liner, and heat dissipation fins are densely arranged on the outer wall of the temperature control liner. The heat dissipation fins are hollow inside and connected to the heat dissipation cavity.

[0012] As a preferred embodiment, the temperature measurement assembly includes a temperature measurement mounting ring fixedly mounted on the temperature control adjustment spindle. The outer wall of the temperature measurement mounting ring is provided with multiple temperature measurement support rods, and multiple temperature sensors of different heights are provided on the temperature measurement support rods.

[0013] As a preferred embodiment, the dual-push linkage includes an adjustment disc that is sleeved on the temperature control adjustment main shaft. The outer wall of the adjustment disc is rotatably connected to multiple temperature control support rods via a rotating shaft. The back of the rapid temperature control plate is provided with a rotating connecting hinge that is rotatably connected to the temperature control support rods.

[0014] As a preferred embodiment, the rapid temperature interference component includes multiple rapid heat exchange seats disposed on the temperature control liner. The rapid heat exchange seats are sealed to the rapid temperature control plate, which is made of flexible metal thermally conductive material and is arranged in a pleated layered manner.

[0015] As a preferred embodiment, an outer jacket and an inner delivery pipe are provided within the space formed by the rapid heat exchange base and the rapid temperature control plate. A refrigerant inlet pipe is connected to the outside of the inner delivery pipe, and a refrigerant outlet pipe is connected to the outside of the outer jacket. The outer jacket and the inner delivery pipe form a heat exchange channel for transporting refrigerant to achieve rapid cooling.

[0016] As a preferred embodiment, the temperature-sensing heating device includes a resistance heating layer disposed inside the temperature control support rod, the resistance heating layer being heated according to the temperature change measured by the temperature sensing component.

[0017] As a preferred embodiment, a cover is provided on the top of the reactor, a turntable is provided on the cover, the top of the temperature control adjustment spindle is connected to the turntable, and two sets of drive push rods for controlling the movement of the adjustment disc are provided at the bottom of the turntable.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention, through a multi-height, multi-radial temperature measurement assembly (multiple temperature measuring supports and temperature sensors at different heights) located at the bottom of the temperature control regulating spindle, can capture the temperature gradient in the vertical and horizontal directions within the reactor in real time, avoiding misjudgments caused by single-point temperature measurement. Combined with a rapid temperature control plate driven by a dual-push linkage, the heat exchange spacing and position can be quickly adjusted according to the measured temperature distribution, achieving precise and uniform temperature control, effectively suppressing side reactions in the production of o-fluorobenzoyl chloride, and improving product yield and purity.

[0019] 2. This invention utilizes a counter-current heat exchange channel formed by a flexible, layered metal temperature control plate and inner and outer jackets. This channel allows for rapid release of refrigerant within tens of seconds, achieving rapid localized cooling (10-20°C) to promptly address overheating or terminate side reactions. Furthermore, a resistance heating layer integrated within the temperature control support rod provides rapid heat replenishment based on temperature measurements, preventing material crystallization or reaction stagnation. The combined effect of these two components enables a sub-second response to abnormal temperature conditions, significantly improving production safety and process adaptability. Attached Figure Description

[0020] Figure 1 This invention presents the structural configuration of an intelligent temperature control device for the production of o-fluorobenzoyl chloride. Figure 1 ; Figure 2 This invention presents the structural configuration of an intelligent temperature control device for the production of o-fluorobenzoyl chloride. Figure 2 ; Figure 3This is a schematic diagram of the structure of the dual-push linkage and the rapid temperature interference component in the intelligent temperature control device for the production of o-fluorobenzoyl chloride proposed in this invention. Figure 4 for Figure 3 Enlarged structural diagram at point A; Figure 5 This is a schematic diagram showing the connection relationship between the temperature control liner and the heat dissipation fins in an intelligent temperature control device for the production of o-fluorobenzoyl chloride proposed in this invention.

[0021] In the diagram: 1. Reactor; 2. Temperature-controlled liner; 3. Continuous electric heating bottom layer; 4. Temperature control adjustment spindle; 5. Rapid temperature control plate; 6. Heat dissipation cavity; 7. Heat dissipation fins; 8. Temperature sensor mounting ring; 9. Temperature sensor support rod; 10. Temperature sensor; 11. Adjustment disc; 12. Temperature control support rod; 13. Rotary connecting hinge; 14. Rapid heat exchange seat; 15. Outer jacket; 16. Inner conveying pipe; 17. Turntable; 18. Drive push rod. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0023] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] Example, refer to Figures 1 to 5A smart temperature control device for the production of o-fluorobenzoyl chloride includes a temperature control liner 2 installed inside a reactor 1. A continuously electrically heated bottom layer 3 is provided at the bottom of the reactor 1. The continuously electrically heated bottom layer 3 is a prior art technology and serves to heat the materials inside the reactor 1. A liquid cooling heat dissipation component is provided inside the temperature control liner 2 to continuously control the materials inside the reactor 1. The liquid cooling heat dissipation component is connected to an external circulating cooling system and can automatically adjust the flow rate of the cooling medium according to process requirements to achieve stable cooling or constant temperature maintenance. By combining bottom electric heating with liquid cooling of the inner lining, the reactor 1 achieves full-range temperature regulation capability, which not only meets the heating requirements but also removes excess heat in time to prevent local overheating and ensure the production stability of o-fluorobenzoyl chloride.

[0026] Furthermore, the liquid cooling heat dissipation component includes a heat dissipation cavity 6 disposed inside the temperature control liner 2. Heat dissipation fins 7 are densely arranged on the outer wall of the temperature control liner 2. The heat dissipation fins 7 are hollow inside and connected to the heat dissipation cavity 6. The heat dissipation cavity 6 is connected to a circulation pipeline. The temperature of the heat dissipation cavity 6 is regulated by continuously circulating and injecting coolant (such as low-temperature heat transfer oil or chilled water). When the coolant flows through the hollow cavity inside the heat dissipation fins 7, it can quickly remove the heat from the surface of the temperature control liner 2, thereby indirectly cooling the reaction material.

[0027] The heat dissipation fins 7 are made of high thermal conductivity aluminum alloy and are arranged in a ring or longitudinal direction to increase the heat exchange area. The hollow heat dissipation fins 7 and the heat dissipation liner 6 form an internal cooling circuit, which greatly improves the heat exchange efficiency and makes the surface temperature distribution of the temperature control liner 2 more uniform, avoiding the problem of local cold or hot areas in traditional jacket cooling.

[0028] The reactor 1 is equipped with a temperature control adjustment spindle 4. At the bottom of the spindle 4 is a temperature measuring component for measuring the temperature of materials at different heights. Further, the temperature measuring component includes a temperature measuring mounting ring 8 fixedly mounted on the spindle 4. Multiple temperature measuring support rods 9 are mounted on the outer wall of the mounting ring 8, and multiple temperature sensors 10 (such as PT100 resistance thermometers or thermocouples) at different heights are mounted on the support rods 9. This enables real-time acquisition of temperatures at different liquid levels and radial positions within the reactor 1. The signals from the temperature sensors 10 are transmitted to the controller wirelessly or via wired connection. This multi-height, multi-point temperature measurement layout accurately captures the temperature gradients in the vertical and horizontal directions within the reactor 1, providing a comprehensive data foundation for the intelligent temperature control system and effectively avoiding misjudgments caused by single-point temperature measurement. This is particularly suitable for temperature-sensitive reaction systems such as o-fluorobenzoyl chloride.

[0029] The temperature control adjustment spindle 4 is connected to the rapid temperature control plate 5 through a double push linkage component. A cover is set on the top of the reactor 1, and a turntable 17 is set on the cover. The top of the temperature control adjustment spindle 4 is connected to the turntable 17. Two sets of drive push rods 18 for controlling the movement of the adjustment disc 11 are set at the bottom of the turntable 17. Furthermore, the double-push linkage includes an adjustment disc 11 that is relatively sleeved on the temperature control adjustment main shaft 4. The outer wall of the adjustment disc 11 is rotatably connected to multiple temperature control support rods 12 via a rotating shaft. The back of the fast temperature control plate 5 is provided with a rotating connecting hinge 13 that is rotatably connected to the temperature control support rods 12. When the adjusting plate 11 moves closer or further away, the temperature control support rod 12 pushes the rapid temperature control plate 5 to expand outward or retract inward, thereby adjusting the distance between the rapid temperature control plate 5 and the inner outer sleeve 15, thus achieving precise temperature control. Furthermore, when the temperature control adjusting main shaft 4 rotates, it can achieve precise contact with the material and continuously change the contact position, thereby obtaining temperature detection at different positions.

[0030] The rapid temperature control plate 5 is equipped with a rapid temperature interference component. This component can quickly release refrigerant to rapidly cool the materials in the reactor 1 when a rapid temperature intervention is required during the production of o-fluorobenzoyl chloride. The double-push linkage is equipped with a temperature-sensing heating device for rapid heating of the materials.

[0031] Furthermore, the rapid temperature interference component includes multiple rapid heat exchange seats 14 disposed on the temperature control liner 2. The rapid heat exchange seats 14 are sealed to the rapid temperature control plate 5. The rapid temperature control plate 5 is made of flexible metal thermally conductive material and is arranged in a pleated layered shape, similar to the folding structure of an accordion bellows. It can maintain a large heat exchange area while freely bending and deforming with the extension and retraction of the double-push linkage component. Small gaps are left between the folded layers to facilitate the flow of refrigerant and heat exchange. The pleated flexible metal plate not only ensures good thermal conductivity but also has the advantages of being foldable and adaptable to the shape of materials. After being sealed to the rapid heat exchange seats 14, it forms an independent heat exchange chamber, avoiding direct contact between the refrigerant and the material, which is safe and reliable.

[0032] An outer jacket 15 and an inner delivery pipe 16 are installed in the space formed by the rapid heat exchange base 14 and the rapid temperature control plate 5. The inner delivery pipe 16 is connected to a refrigerant inlet pipe, and the outer jacket 15 is connected to a refrigerant outlet pipe. The outer jacket 15 and the inner delivery pipe 16 form a heat exchange channel for transporting refrigerant to achieve rapid cooling. The counter-current heat exchange channel formed by the inner and outer pipes greatly improves the refrigerant utilization efficiency and cooling speed, and can reduce the temperature of a local area by 10-20°C within tens of seconds, meeting the emergency cooling needs in the production of o-fluorobenzoyl chloride.

[0033] The temperature-sensing heating device includes a resistance heating layer disposed inside the temperature control support rod 12, which heats the device according to the temperature change measured by the temperature sensing component.

[0034] The rapid temperature control plate 5 is equipped with a rapid temperature interference component. This component allows for the rapid release of refrigerant to quickly cool the materials in the reactor 1 during the o-fluorobenzoyl chloride production process, when drastic temperature intervention is required (e.g., when the reaction experiences a temperature runaway or rapid cooling is needed to terminate side reactions). Simultaneously, the dual-push linkage is equipped with a temperature-sensing heating device that rapidly heats the materials. This heating device, linked to the temperature sensing component, can immediately replenish heat when a localized low temperature is detected, preventing material crystallization or reaction stagnation. The two components work together to provide a dual-directional temperature interference capability of "rapid cooling + rapid heating."

[0035] After the device is started, the continuous electric heating layer 3 at the bottom of the reactor 1 begins to work (such as resistance wire or electromagnetic heating) to initially heat the o-fluorobenzoyl chloride reactant in the reactor 1 to the required reaction start temperature. The liquid cooling heat dissipation component in the temperature-controlled liner 2 is in standby mode, and the external circulating cooling system maintains a low flow rate or is turned off according to the preset temperature curve. When excess heat is generated during the reaction or when it is necessary to stabilize at a certain temperature, the circulation pipeline begins to inject coolant (low-temperature heat transfer oil or chilled water) into the heat dissipation liner 6. After the coolant enters the heat dissipation liner 6, because the heat dissipation fins 7 are hollow and connected to the heat dissipation liner 6, the coolant will quickly fill the hollow cavities of all the heat dissipation fins 7. As the coolant flows through the fins, it quickly absorbs the heat from the surface of the temperature-controlled liner 2 and carries the heat out of the reactor 1 through the circulation pipeline, thus achieving indirect cooling of the reactant.

[0036] During this process, the temperature control adjustment spindle 4 can be driven to rotate or move up and down by the top motor. The temperature measurement mounting ring 8 fixed at its bottom moves with the spindle, and multiple temperature measurement support rods 9 on the outer wall and temperature sensors 10 (PT100 or thermocouples) at different heights on the support rods collect temperature data in real time at different liquid levels and radial positions inside the reactor 1.

[0037] When the controller detects that the temperature in a certain area deviates from the set value (but does not reach the drastic intervention threshold), it will drive the adjustment disk 11 on the temperature control adjustment spindle 4 to move closer to or further away from the main body of the reactant material. The adjustment disk 11, through the temperature control support rod 12 and the rotating connecting hinge 13, pushes the rapid temperature control plate 5 to expand outward or retract inward, so that it moves closer to or further away from the main body of the reactant material.

[0038] The heat exchange efficiency is controlled by adjusting the distance between the rapid temperature control plate 5 and the outer jacket tube 15 (i.e., the refrigerant heat exchange structure). At the same time, the rotation of the temperature control adjustment spindle 4 allows the rapid temperature control plate 5 to continuously change its contact position with the material, achieving uniform temperature control in different areas and assisting the temperature sensor in obtaining a more comprehensive temperature distribution.

[0039] When the temperature sensing component detects a sharp rise in reaction temperature, exceeding the safety limit or requiring rapid termination of the side reaction, the controller immediately activates the rapid temperature interference component. The controller opens the refrigerant inlet pipe, and the low-temperature refrigerant (liquid nitrogen, low-temperature brine, or chilled water) enters the sealed space formed by the rapid heat exchange seat 14 and the rapid temperature control plate 5 through the inner delivery pipe 16. The refrigerant flows in the inner delivery pipe 16, and after turning back at the end, it flows through the annular gap between the outer sleeve 15 and the inner delivery pipe 16, forming a counter-current heat exchange channel, thereby achieving rapid and effective temperature intervention on the material.

[0040] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A smart temperature control device for the production of o-fluorobenzoyl chloride, comprising a temperature control liner (2) installed inside a reaction vessel (1), wherein a continuously electrically heated bottom layer (3) is provided at the bottom of the reaction vessel (1), characterized in that, The temperature-controlled liner (2) is equipped with a liquid-cooled heat dissipation component that continuously controls the material inside the reactor (1). The reactor (1) is equipped with a temperature-controlled adjustment spindle (4). The bottom of the temperature-controlled adjustment spindle (4) is equipped with a temperature measuring component for measuring the material at different heights. The temperature-controlled adjustment spindle (4) is connected to a rapid temperature control plate (5) through a double-push linkage component. The rapid temperature control plate (5) is equipped with a rapid temperature interference component. The double-push linkage component is equipped with a temperature-sensing heating device for rapidly heating the material.

2. The intelligent temperature control device for the production of o-fluorobenzoyl chloride according to claim 1, characterized in that, The liquid cooling heat dissipation assembly includes a heat dissipation cavity (6) disposed inside the temperature control liner (2). Heat dissipation fins (7) are densely arranged on the outer wall of the temperature control liner (2). The heat dissipation fins (7) are hollow inside and connected to the heat dissipation cavity (6).

3. The intelligent temperature control device for the production of o-fluorobenzoyl chloride according to claim 1, characterized in that, The temperature measurement component includes a temperature measurement mounting ring (8) fixedly mounted on the temperature control adjustment spindle (4). Multiple temperature measurement support rods (9) are provided on the outer side wall of the temperature measurement mounting ring (8), and multiple temperature sensors (10) of different heights are provided on the temperature measurement support rods (9).

4. The intelligent temperature control device for the production of o-fluorobenzoyl chloride according to claim 1, characterized in that, The dual-push linkage includes an adjustment disc (11) that is sleeved on the temperature control adjustment main shaft (4). The outer wall of the adjustment disc (11) is rotatably connected to multiple temperature control rods (12) via a rotating shaft. The back of the rapid temperature control plate (5) is provided with a rotating connecting hinge (13) that is rotatably connected to the temperature control rods (12).

5. The intelligent temperature control device for the production of o-fluorobenzoyl chloride according to claim 1, characterized in that, The rapid temperature interference component includes multiple rapid heat exchange seats (14) disposed on the temperature control liner (2). The rapid heat exchange seats (14) are sealed to the rapid temperature control plate (5). The rapid temperature control plate (5) is made of flexible metal thermal conductive material and is arranged in a pleated layered manner.

6. The intelligent temperature control device for the production of o-fluorobenzoyl chloride according to claim 5, characterized in that, The space formed by the rapid heat exchange base (14) and the rapid temperature control plate (5) is provided with an outer tube (15) and an inner delivery tube (16). The inner delivery tube (16) is connected to a refrigerant inlet pipe, and the outer tube (15) is connected to a refrigerant outlet pipe. The outer tube (15) and the inner delivery tube (16) form a heat exchange channel for delivering refrigerant to achieve rapid cooling.

7. The intelligent temperature control device for the production of o-fluorobenzoyl chloride according to claim 1, characterized in that, The temperature-sensing heating device includes a resistance heating layer disposed inside the temperature control support rod (12), which heats the temperature according to the temperature change measured by the temperature measuring component.

8. The intelligent temperature control device for the production of o-fluorobenzoyl chloride according to claim 1, characterized in that, The reactor (1) is provided with a cover, and a turntable (17) is provided on the cover. The top of the temperature control adjustment spindle (4) is connected to the turntable (17), and the bottom of the turntable (17) is provided with two sets of drive push rods (18) for moving the control adjustment discs (11).

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