Temperature control device for preparing chloropropionyl chloride

Abstract

The invention discloses a temperature control device for preparation of chloropropionyl chloride, relates to the technical field of preparation of chloropropionyl chloride, and aims to solve the problems that flexible switching and accurate control of the temperature cannot be effectively realized by existing equipment, and when temperature zoning control is performed on a reaction environment, due to the fact that heat between adjacent temperature zones is easy to mutually transfer, the temperature of the reaction environment cannot be effectively controlled. The temperature of each area is difficult to maintain in a preset value range, so that the temperature condition in the preparation process is difficult to meet the high-precision requirement, and the quality and the production efficiency of the chloropropionyl chloride product are further influenced. And internal air is continuously updated, heat redundancy is avoided, and heat difference interference of adjacent cabins is reduced. A heat insulation plate and a push plate in the circulation assembly are matched with each other, heat transfer is effectively isolated, and a good circulation air channel is formed to discharge heat.

Description

Technical Field

[0001] The present invention relates to the technical field of chloropropionyl chloride preparation, and specifically to a temperature control device for chloropropionyl chloride preparation. Background Art

[0002] Chloropropionyl chloride is an important organic synthesis intermediate in the chemical industry. During the preparation process of chloropropionyl chloride, precise temperature control is crucial for the quality, yield, and reaction stability of the product.

[0003] In this regard, the published patent CN115353451A discloses a method for preparing 2-chloropropionyl chloride. By cooling the reaction solution and removing the catalyst and free radical scavenger, 2-chloropropionyl chloride is obtained. It can improve the purity and yield of the product while reducing the dosage of the free radical scavenger and the reaction energy consumption.

[0004] Traditional reaction equipment for chloropropionyl chloride preparation usually uses a single reaction chamber, which is difficult to meet the requirements of different temperature environments for different reaction stages simultaneously. In some complex preparation processes, continuous reactions may need to be carried out under different temperature conditions, but existing equipment often cannot effectively achieve flexible switching and precise control of such temperatures. Moreover, when attempting to control the temperature of the reaction environment in zones, due to the easy heat transfer between adjacent temperature zones, it is difficult to stably maintain the temperature of each zone within the preset value range, making the temperature conditions during the preparation process difficult to meet high-precision requirements, thereby affecting the quality and production efficiency of chloropropionyl chloride products.

[0005] In view of the above problems, a temperature control device for chloropropionyl chloride preparation is proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide a temperature control device for chloropropionyl chloride preparation, which solves the problem that the temperature of each zone is difficult to stably maintain in the background art.

[0007] To achieve the above purpose, the present invention provides the following technical solution: A temperature control device for chloropropionyl chloride preparation, the chloropropionyl chloride preparation includes:

[0008] Raw material preparation: Propionic acid, phosphorus trichloride;

[0009] Propionic acid is the main starting material for synthesizing chloropropionyl chloride, and phosphorus chloride is used as a chlorinating agent to react with propionic acid;

[0010] The molar ratio of propionic acid to phosphorus trichloride is 1:1 or 1:1.2;

[0011] S1: Place propionic acid and phosphorus trichloride in two clean, dry raw material storage containers with precise scales and stirring devices respectively. First, add propionic acid to the starting chamber through a pipeline at a slow and stable flow rate. According to a ratio of 1:1 or 1:1.2, add phosphorus trichloride to the starting chamber through the pipeline as well. Then, turn on the stirring device in the starting chamber with a stirring speed of 100 - 150 revolutions per minute to fully mix propionic acid and phosphorus trichloride and start the reaction under the temperature environment of the starting chamber;

[0012] S2: After the preliminary reaction in the starting chamber, transfer the reaction materials to the inside of the intermediate reaction chamber. Inside the intermediate reaction chamber, turn on the stirring device in the intermediate reaction chamber, and the stirring speed can be set to 80 - 100 revolutions per minute to make propionic acid and phosphorus trichloride react again under the temperature environment of the intermediate reaction chamber;

[0013] The preparation of chloropropionyl chloride is also provided with a starting chamber, a transition chamber and an intermediate reaction chamber;

[0014] The starting chamber, the transition chamber and the intermediate reaction chamber are connected. The raw material storage containers are embedded inside the starting chamber, the transition chamber and the intermediate reaction chamber, and a sliding connection is maintained between the raw material storage device and the starting chamber, the transition chamber and the intermediate reaction chamber;

[0015] Isolation components are arranged on the front and back sides of the transition chamber. The isolation components include heat dissipation vents. Inside the heat dissipation vents, circulating plug pieces are embedded. The bottom end of the circulating plug pieces is connected with reciprocating rods. The bottom ends of the starting chamber and the intermediate reaction chamber are connected with support skeletons. Inside the support skeletons, transmission gears are embedded, and the transmission gears are meshed with the reciprocating rods;

[0016] A circulating component is embedded inside the transition chamber. The circulating component includes a backing plate. Heat insulation plates are connected to the left and right sides of the backing plate. A push plate is also connected to the upper surface of the backing plate. The push plate is set in the shape of "]". An integrated circuit box is connected to the inner wall of the push plate. The integrated circuit box is connected with a temperature sensor through a wire. A sealing door is embedded inside the starting chamber. A lifting push rod is connected to the top end of the sealing door. A sealing cover plate is arranged at the top end of the transition chamber. A push plate is connected to the bottom end of the sealing cover plate. A lifting push rod is installed on the side of the starting chamber, and the output end of the lifting push rod is connected to the sealing cover plate to push the sealing cover plate.

[0017] Preferably, before adding propionic acid and phosphorus trichloride to the raw material storage container, preheat propionic acid to raise the temperature of propionic acid to close to the starting reaction temperature of the starting chamber. The preheating temperature of propionic acid = the starting reaction temperature of the starting chamber - 10°C.

[0018] Preferably, propionic acid is added. After it reaches a certain reaction degree in the starting chamber, phosphorus trichloride is added in proportion. Secondly, after the reaction materials are transferred to the intermediate reaction chamber, the materials are briefly allowed to stand still, and the materials are naturally diffused and evenly distributed under the temperature environment of the intermediate reaction chamber, and then the stirring device is started for reaction.

[0019] Preferably, a ventilation block is embedded inside the heat dissipation vent. Uniformly arranged openings are formed on the ventilation block. The circulation plug is embedded inside the heat dissipation vent and is movably connected. There are two groups of circulation plugs. When the two groups of circulation plugs move left and right, only one group of them is embedded inside the heat dissipation vent.

[0020] Preferably, sealing doors are provided on one side of the starting chamber and the intermediate reaction chamber close to the transition chamber. The two sealing doors separate the starting chamber, the transition chamber and the intermediate reaction chamber into three independent spaces. The top of the transition chamber is sealed by a sealing cover plate.

[0021] Preferably, the temperature sensor penetrates through the push plate and the heat insulation plate until it extends into the sealing door. There are two groups of temperature sensors. The detection end of one group of temperature sensors is embedded inside the starting chamber, and the detection end of the other group of temperature sensors is embedded inside the intermediate reaction chamber.

[0022] Preferably, the spacer plate and the push plate are connected in a horizontal sliding manner. A spring is provided at the connection between the push plate and the spacer plate. The spring is used to reset the push plate.

[0023] Preferably, the inside of the push plate is hollow and is made into a vacuum through treatment. The left and right movement of the push plate squeezes the air between the push plate and the heat insulation plate.

[0024] Preferably, the two push plates correspond to each other. A heat dissipation channel for air circulation is left between the push plates. The heat dissipation channel corresponds to the heat dissipation vent.

[0025] Preferably, an integrated circuit box is provided inside each push plate. The two integrated circuit boxes centrally process the collected data, read the data of the two temperature sensors from the buffer area storing the data, compare them one by one, calculate the difference, and use the mean absolute difference algorithm:

[0026]

[0027] where n is the number of data points, T1 is the temperature collected in the starting chamber, and T2 is the temperature collected in the intermediate reaction chamber.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] 1. A temperature control device for the preparation of chloropropionyl chloride provided by the present invention preheats propionic acid and controls the addition sequence, stirring speed, etc. during raw material treatment, making the reaction more stable and efficient. In terms of chamber design, through the settings of the starting chamber, transition chamber, and intermediate reaction chamber, the requirements for different temperature environments in different reaction stages are met, and precise temperature control is flexibly achieved, overcoming the defect that it is difficult for a traditional single chamber to meet multiple temperature requirements. The isolation component in the transition chamber continuously updates the internal air through two groups of circulating plug pieces in cooperation with heat dissipation vents and transmission teeth, avoiding heat redundancy and reducing the interference of heat differences between adjacent chambers. The heat insulation board and push plate in the circulation component cooperate with each other to effectively isolate heat transfer and form a good circulating air duct to discharge heat. Two integrated circuit boxes centrally process the data of two temperature sensors, and use the mean absolute difference algorithm to monitor temperature changes in real time, which can further control the reaction time, and overall improve the stability, repeatability, efficiency, and product quality of the reaction. Description of the Drawings

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 It is a schematic diagram of the structure of the heat dissipation vent and circulating plug piece of the present invention;

[0032] Figure 3 It is a schematic diagram of the structure of the lifting push rod and transmission tooth of the present invention;

[0033] Figure 4 It is a schematic diagram of the structure of the sealing door and backing plate of the present invention;

[0034] Figure 5 It is a schematic diagram of the structure of the reciprocating rod and transmission tooth of the present invention;

[0035] Figure 6 It is a schematic diagram of the structure of the push plate and temperature sensor of the present invention;

[0036] Figure 7 It is a schematic diagram of the structure of the push plate and heat insulation board of the present invention;

[0037] Figure 8 It is a schematic diagram of the structure of the heat dissipation vent and ventilation block of the present invention.

[0038] In the figure: 11, starting chamber; 12, transition chamber; 13, intermediate reaction chamber; 2, isolation component; 21, heat dissipation vent; 22, circulating plug piece; 23, reciprocating rod; 24, lifting push rod; 25, transmission tooth; 26, support skeleton; 27, ventilation block; 3, circulation component; 31, lifting push rod; 32, sealing door; 33, sealing cover plate; 34, backing plate; 35, push plate; 36, heat insulation board; 37, integrated circuit box; 38, temperature sensor. Detailed Embodiments

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0040] To further understand the content of the present invention, the present invention will be described in detail with reference to the accompanying drawings.

[0041] Combined Figures 1-8 , a temperature control device for the preparation of chloropropionyl chloride according to the present invention, the preparation of chloropropionyl chloride includes:

[0042] Raw material preparation: propionic acid, phosphorus trichloride;

[0043] Propionic acid is the main starting material for synthesizing chloropropionyl chloride, and phosphorus chloride is used as a chlorinating agent to react with propionic acid;

[0044] The molar ratio of propionic acid to phosphorus trichloride is 1:1 or 1:1.2;

[0045] S1: Place propionic acid and phosphorus trichloride in two clean, dry and accurately calibrated raw material storage containers with stirring devices respectively. Before adding propionic acid and phosphorus trichloride to the raw material storage containers, preheat propionic acid to make the temperature of propionic acid rise to close to the starting reaction temperature of the starting chamber 11. The preheating temperature of propionic acid = the starting reaction temperature of the starting chamber 11 - 10°C. First, add propionic acid to the starting chamber 11 through a pipeline at a slow and stable flow rate. According to the ratio of 1:1 or 1:1.2, add phosphorus trichloride to the starting chamber 11 through the pipeline in the same way. Then, turn on the stirring device in the starting chamber 11, and the stirring speed is 100 - 150 revolutions per minute, so that propionic acid and phosphorus trichloride are fully mixed and start to react under the temperature environment of the starting chamber 11;

[0046] S2: After the preliminary reaction in the starting chamber 11, transfer the reaction material to the inside of the intermediate reaction chamber 13, add propionic acid, and after it reaches a certain reaction degree in the starting chamber 11, add phosphorus trichloride in proportion. Secondly, after the reaction material is transferred to the intermediate reaction chamber 13, let the material stand briefly, and let the material diffuse evenly naturally under the temperature environment of the intermediate reaction chamber 13, and then turn on the stirring device for reaction. Inside the intermediate reaction chamber 13, turn on the stirring device in the intermediate reaction chamber 13, and the stirring speed can be set to 80 - 100 revolutions per minute, so that propionic acid and phosphorus trichloride react again under the temperature environment of the intermediate reaction chamber 13.

[0047] The preparation of chloropropionyl chloride is also provided with a starting chamber 11, a transition chamber 12 and an intermediate reaction chamber 13;

[0048] The starting chamber 11, the transition chamber 12 and the intermediate reaction chamber 13 are connected in communication. The raw material storage container is embedded inside the starting chamber 11, the transition chamber 12 and the intermediate reaction chamber 13. A sliding connection is maintained between the raw material storage device and the starting chamber 11, the transition chamber 12 and the intermediate reaction chamber 13. When the raw material storage container slides inside the starting chamber 11, the transition chamber 12 and the intermediate reaction chamber 13, the transfer of raw materials is realized. When the raw material storage container is inside the starting chamber 11, the reaction is carried out at the starting temperature of the starting chamber 11. When the raw material storage container is inside the intermediate reaction chamber 13, the raw materials are made to react at the starting temperature of the intermediate reaction chamber 13;

[0049] By setting two chambers with different temperatures, the requirements for different temperature environments in different reaction stages during the preparation of chloropropionyl chloride can be met. When some reaction stages may require a higher temperature to accelerate the reaction rate, while some stages need to be carried out at a lower temperature to improve the product selectivity, precise control of different temperatures can be flexibly achieved;

[0050] In addition, traditional preparation reaction equipment usually uses a single reaction chamber and is difficult to meet the requirements for different temperatures in different reaction stages at the same time. In some existing equipment that attempts to carry out temperature zoning control, heat is easily transferred interactively between adjacent temperature regions, making it difficult to stably maintain the temperature of each region within the preset value range. To solve this problem, a transition chamber 12 is provided between the two chambers and is internally provided with an isolation component 2 and a circulation component 3, effectively avoiding the interactive transfer of heat. In this way, the temperature inside each chamber can be ensured to be more stable and not interfered by the temperature changes of adjacent chambers, thereby improving the stability and repeatability of the reaction. The specific operation is as follows:

[0051] Isolation components 2 are provided on the front and rear sides of the transition chamber 12. The isolation component 2 includes heat dissipation vents 21. A circulation plug 22 is embedded inside the heat dissipation vents 21. The bottom end of the circulation plug 22 is connected to a reciprocating rod 23. The bottom ends of the starting chamber 11 and the intermediate reaction chamber 13 are connected to a support skeleton 26. A transmission gear 25 is embedded inside the support skeleton 26. The transmission gear 25 meshes with the reciprocating rod 23. A ventilation block 27 is embedded inside the heat dissipation vents 21. The ventilation block 27 is provided with uniformly arranged openings. The circulation plug 22 is embedded inside the heat dissipation vents 21 and is movably connected. Two groups of circulation plugs 22 are provided. When the two groups of circulation plugs 22 move left and right, only one group is embedded inside the heat dissipation vents 21;

[0052] First, to ensure that there is no interference from temperature changes between the starting chamber 11 and the intermediate reaction chamber 13, the transition chamber 12 cannot be affected by temperature. Therefore, for heat dissipation inside the transition chamber 12, two sets of heat dissipation vents 21 are provided to dissipate heat inside the transition chamber 12. When the transmission gear 25 is driven by a motor, the rotation of the transmission gear 25 drives the reciprocating rod 23, which in turn drives the movement of the circulating plug 22. In this state, one set of circulating plugs 22 moves outward along the heat dissipation vent 21, while the other set of circulating plugs 22 moves inward along the heat dissipation vent 21. At this time, the hot air inside the transition chamber 12 will be pushed out and discharged from the heat dissipation vent 21. By repeating this process, the air inside the transition chamber 12 is continuously replaced to avoid heat redundancy inside the transition chamber 12. When the temperature of the transition chamber 12 is controlled, the heat generated by the starting chamber 11 is discharged by the transition chamber 12, and the heat generated by the intermediate reaction chamber 13 is also discharged by the transition chamber 12. In this way, the interference caused by the heat difference between the starting chamber 11 and the intermediate reaction chamber 13 is reduced. On the basis of reducing the interference from the external heat difference, the control of the internal temperatures of the starting chamber 11 and the intermediate reaction chamber 13 becomes more precise, which can improve the reaction quality of the preparation of chloropropionyl chloride.

[0053] In addition, to avoid heat transfer, heat insulation is carried out through the transition chamber 12. The specific operation is as follows:

[0054] A circulation component 3 is embedded inside the transition cabin 12. The circulation component 3 includes a backing plate 34. Heat insulation plates 36 are connected to the left and right sides of the backing plate 34. A push plate 35 is also connected to the upper surface of the backing plate 34. The push plate 35 is set in the shape of "]". The push plate 35 is connected to the backing plate 34 in a horizontal sliding manner. A spring is provided at the connection between the push plate 35 and the backing plate 34, and the spring is used to reset the push plate 35. The inside of the push plate 35 is hollow and is made into a vacuum through treatment. When the push plate 35 moves left and right, it squeezes the air between the push plate 35 and the heat insulation plate 36. Two groups of push plates 35 correspond to each other, and a heat dissipation channel for air circulation is left between the push plates 35. The heat dissipation channel corresponds to the heat dissipation opening 21. An integrated circuit box 37 is connected to the inner wall of the push plate 35. The integrated circuit box 37 is connected to a temperature sensor 38 through a wire. The temperature sensor 38 penetrates through the push plate 35 and the heat insulation plate 36 and extends into the sealing door 32. There are two groups of temperature sensors 38. The detection end of one group of temperature sensors 38 is embedded inside the starting cabin 11, and the detection end of the other group of temperature sensors 38 is embedded inside the intermediate reaction cabin 13. A sealing door 32 is embedded inside the starting cabin 11. A sealing cover plate 33 is provided at the top of the transition cabin 12. The bottom end of the sealing cover plate 33 is connected to the push plate 35. A lifting push rod 24 is installed on the side of the starting cabin 11. The output end of the lifting push rod 24 is connected to the sealing cover plate 33 and is used to push the sealing cover plate 33. Sealing doors 32 are provided on one side of the starting cabin 11 and the intermediate reaction cabin 13 close to the transition cabin 12. The two groups of sealing doors 32 separate the starting cabin 11, the transition cabin 12, and the intermediate reaction cabin 13 into three independent spaces. The top of the transition cabin 12 is sealed by the sealing cover plate 33. A lifting push rod 31 is connected to the top end of the sealing door 32.

[0055] During normal operation, the sealed door 32 separates the starting chamber 11, the transition chamber 12, and the intermediate reaction chamber 13 into three independent spaces. To inhibit heat transfer, a heat insulation plate 36 is provided to isolate heat transfer. Since the heat insulation plate 36 is relatively close to the sealed door 32, it is most affected by heat interference, and at this time, the redundant heat in the heat insulation plate 36 is the most. The redundant heat in the heat insulation plate 36 is transferred inside the transition chamber 12 in the form of thermal radiation. At this time, the push plate 35 moves left and right inside the transition chamber 12. The movement of the push plate 35 can be completed by installing an electric push rod. When the push plate 35 approaches the heat insulation plate 36, the hot air between the push plate 35 and the heat insulation plate 36 will be squeezed, and the squeezed air will overflow outward. The overflowed air is finally introduced into the inside of the heat dissipation vent 21, so as to cooperate with the left and right of the heat dissipation vent 21 to be squeezed and discharged. In this way, a good circulating air duct is formed inside, and the heat circulates inside, taking away the internal heat and finally being discharged. In addition, to inhibit the heat interaction between the starting chamber 11 and the intermediate reaction chamber 13, both the provided heat insulation plate 36 and the push plate 35 can play an isolation role, so that the heat can be locked in the transition chamber 12 and finally discharged.

[0056] An integrated circuit box 37 is provided inside each group of push plates 35. The two integrated circuit boxes 37 centrally process the collected data, read the data of the two temperature sensors 38 from the buffer area storing the data, compare them one by one, and calculate the difference. The average absolute difference algorithm:

[0057]

[0058] where n is the number of data points, T1 is the temperature collected in the starting chamber 11, and T2 is the temperature collected in the intermediate reaction chamber 13. By monitoring the temperature changes in the starting chamber 11 and the intermediate reaction chamber 13 in real time, the reaction time is further controlled.

[0059] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0060] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A temperature control device for preparing chloropropionyl chloride, characterized in that, The preparation of chloropropionyl chloride includes: Raw material preparation: propionic acid, phosphorus trichloride; The main starting material for the synthesis of chloropropionyl chloride from propionic acid, phosphorus chloride is used as a chlorinating agent to react with propionic acid; The molar ratio of propionic acid to phosphorus trichloride is 1:1 or 1:1.2; S1: Propionic acid and phosphorus trichloride are placed in two clean, dry raw material storage containers equipped with precise scales and stirring devices, respectively. Propionic acid is first added to the starting chamber (11) through a pipeline at a slow and steady flow rate. Phosphorus trichloride is also added to the starting chamber (11) through a pipeline in a ratio of 1:1 or 1:1.

2. The stirring device in the starting chamber (11) is turned on at a stirring speed of 100-150 revolutions per minute, so that propionic acid and phosphorus trichloride are fully mixed under the temperature environment of the starting chamber (11) and start the reaction; S2: After the initial reaction in the starting chamber (11), the reaction materials are transferred to the interior of the intermediate reaction chamber (13). Inside the intermediate reaction chamber (13), a stirring device in the intermediate reaction chamber (13) is turned on. The stirring speed can be set to 80-100 revolutions per minute, so that propionic acid and phosphorus trichloride react again under the temperature environment of the intermediate reaction chamber (13); The chloropropionyl chloride preparation is also provided with a starting chamber (11), a transition chamber (12) and an intermediate reaction chamber (13); The starting chamber (11), the transition chamber (12) and the intermediate reaction chamber (13) are connected, the raw material storage container is embedded in the starting chamber (11), the transition chamber (12) and the intermediate reaction chamber (13), and the raw material storage device is slidably connected to the starting chamber (11), the transition chamber (12) and the intermediate reaction chamber (13); Isolation components (2) are arranged on both the front and rear sides of the transition chamber (12), the isolation components (2) comprising a heat dissipation vent (21), a circulation plug (22) is embedded inside the heat dissipation vent (21), a reciprocating rod (23) is connected to the bottom end of the circulation plug (22), a support frame (26) is connected to the bottom ends of the starting chamber (11) and the intermediate reaction chamber (13), a transmission tooth (25) is embedded inside the support frame (26), and the transmission tooth (25) is meshed with the reciprocating rod (23); A circulation component (3) is embedded in the transition chamber (12), and the circulation component (3) includes a pad (34). The left and right sides of the pad (34) are connected to heat insulation plates (36). The upper surface of the pad (34) is also connected to a push plate (35). The push plate (35) is arranged in a "]" shape. An integrated circuit box (37) is connected to the inner wall of the push plate (35). The integrated circuit box (37) is connected to a temperature sensor (38) via a wire. A sealing door (32) is embedded inside the starting cabin (11), and the top end of the sealing door (32) is connected to a lifting push rod (31). A sealing cover plate (33) is provided at the top end of the transition cabin (12), and the bottom end of the sealing cover plate (33) is connected to a push plate (35). A lifting push rod (24) is installed on the side of the starting cabin (11), and the output end of the lifting push rod (24) is connected to the sealing cover plate (33) for pushing the sealing cover plate (33).

2. The temperature control device for preparing chloropropionyl chloride according to claim 1, characterized in that: Before adding propionic acid and phosphorus trichloride into the raw material storage container, the propionic acid is preheated to raise the temperature of the propionic acid to a temperature close to the starting reaction temperature of the starting chamber (11), and the propionic acid preheating temperature = the starting reaction temperature of the starting chamber (11) - 10°C.

3. The temperature control device for preparing chloropropionyl chloride according to claim 1, characterized in that: Propionic acid is added, and after it reaches a certain degree of reaction in the starting chamber (11), phosphorus trichloride is added in proportion. Then, the reaction materials are transferred to the intermediate reaction chamber (13), and the materials are briefly allowed to stand to allow the materials to diffuse evenly under the temperature environment of the intermediate reaction chamber (13), and then the stirring device is turned on to react.

4. The temperature control device for preparing chloropropionyl chloride according to claim 1, characterized in that: A ventilation block (27) is embedded in the heat dissipation vent (21), and the ventilation block (27) is provided with evenly spaced openings. The circulation plug (22) is embedded in the heat dissipation vent (21) and is movably connected. Two groups of circulation plugs (22) are provided. When the two groups of circulation plugs (22) move left and right, only one group is embedded in the heat dissipation vent (21).

5. The temperature control device for preparing chloropropionyl chloride according to claim 1, characterized in that: The starting chamber (11) and the intermediate reaction chamber (13) are both provided with sealing doors (32) on one side close to the transition chamber (12); the two sets of sealing doors (32) separate the starting chamber (11), the transition chamber (12) and the intermediate reaction chamber (13) into three independent spaces; the top of the transition chamber (12) is sealed by a sealing cover plate (33).

6. The temperature control device for preparing chloropropionyl chloride according to claim 1, characterized in that: The temperature sensor (38) penetrates the push plate (35) and the heat insulation plate (36) until it extends into the sealed door (32). Two groups of the temperature sensor (38) are provided, wherein the detection end of one group of temperature sensors (38) is embedded in the interior of the starting chamber (11), and the detection end of the other group of temperature sensors (38) is embedded in the interior of the intermediate reaction chamber (13).

7. The temperature control device for preparing chloropropionyl chloride according to claim 1, characterized in that: The pad (34) and the push plate (35) are connected in a transverse sliding manner, and a spring is provided at the connection between the push plate (35) and the pad (34), and the spring is used to reset the push plate (35).

8. The temperature control device for preparing chloropropionyl chloride according to claim 7, characterized in that: The interior of the push plate (35) is hollow and is vacuumed by processing. The push plate (35) moves left and right to squeeze the air between the push plate (35) and the heat insulation plate (36).

9. The temperature control device for preparing chloropropionyl chloride according to claim 8, characterized in that: The two groups of push plates (35) correspond to each other, and a heat dissipation channel for air circulation is reserved between the push plates (35), and the heat dissipation channel corresponds to the heat dissipation opening (21).

10. The temperature control device for preparing chloropropionyl chloride according to claim 9, characterized in that: Each group of push plates (35) is provided with an integrated circuit box (37) inside. The two groups of integrated circuit boxes (37) centrally process the collected data, read the data of the two groups of temperature sensors from the buffer for storing data, compare them one by one, calculate the difference, and use the mean absolute difference algorithm: Where n is the number of data points, T1 is the temperature collected in the starting chamber (11), and T2 is the temperature collected in the intermediate reaction chamber (13).

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