Continuous diazotization safety reaction device for synthesizing aryl pyrazoles nitrile

Abstract

The invention belongs to the technical field of microchannel reaction, and particularly relates to a continuous diazotization safety reaction device for synthesizing aryl pyrazoles nitrile, the continuous diazotization safety reaction device comprises a thermal insulation shell and a controller arranged on one side of the thermal insulation shell, a plurality of groups of reaction channel plates are arranged in the thermal insulation shell, a reaction flow channel is arranged between two reaction channel plates in the same group, and the controller is arranged in the thermal insulation shell. Each group of reaction channel plates and the thermal insulation shell are jointly provided with a communication assembly, the plurality of thermal insulation blocks are respectively arranged between two corresponding groups of reaction channel plates, the two ends of each thermal insulation block are provided with mounting grooves, and each mounting groove is internally provided with an ultrasonic machine head. According to the invention, the possibility that the reaction flow channel is blocked by diazonium salt separated out in the reaction can be avoided as much as possible, accurate unblocking can be realized, the anti-blocking effect is good, the reaction flow channel can be inspected in the continuous reaction, and meanwhile, personnel can be reminded in time when the reaction is abnormal based on temperature change.

Description

Technical Field

[0001] The present invention belongs to the technical field of microchannel reaction, and in particular relates to a continuous diazotization safety reaction device for synthesizing arylpyrazole nitrile. Background Art

[0002] In the diazotization reaction for synthesizing arylpyrazole nitrile, the microchannel reactor has the characteristics of efficient mass and heat transfer and strong reaction controllability, and can realize the continuous and safe production of the diazotization reaction, effectively improving the reaction efficiency and safety.

[0003] The microchannel reactor uses channels from micrometers to millimeters, and utilizes a large specific surface area to strengthen mass and heat transfer, achieving efficient control and rapid reaction of the reaction process. It can be used for continuous diazotization reactions, such as the microchannel continuous flow reactor disclosed in the patent publication number CN112973596B; in the synthesis reaction of arylpyrazole nitrile, it is mainly prepared by diazo coupling of 2,6-dichloro-4-trifluoromethylaniline and then cyclization under alkaline conditions. During the diazotization process, due to the precipitation of the diazonium salt, it is easy to block the channels, which not only easily affects the continuity of the reaction, but also causes an increase in the concentration of upstream raw materials due to blockage, which is not conducive to the reaction safety. Ordinary microchannel reactors cannot be applied to this kind of working condition. Summary of the Invention

[0004] The purpose of the present invention is to solve the above problems and provide a continuous diazotization safety reaction device for synthesizing arylpyrazole nitrile.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions: A continuous diazotization safety reaction device for synthesizing arylpyrazole nitrile includes a heat-insulating outer shell and a controller arranged on one side of the heat-insulating outer shell. A plurality of reaction channel plates are arranged inside the heat-insulating outer shell. A reaction flow channel is arranged between two reaction channel plates in the same group. A communication component is installed jointly by each group of reaction channel plates and the heat-insulating outer shell. The device further includes: A plurality of heat-insulating blocks are respectively arranged between the corresponding two groups of reaction channel plates. Installation grooves are opened at both ends of each heat-insulating block, and ultrasonic heads are arranged inside each installation groove. A plurality of driving units are all installed on the top of the heat-insulating outer shell. The driving units are used to drive the corresponding heat-insulating blocks to move along the reaction flow channel on the same side. A plurality of temperature measuring components are all arranged inside the corresponding installation grooves and are used to detect the temperature around the reaction flow channel. A temperature control unit is arranged inside the heat-insulating outer shell and is used to control the temperature of each group of reaction channel plates.

[0006] Preferably, the connecting components include a liquid inlet pipe and a liquid outlet pipe. The liquid inlet pipe is inserted into the top of the heat-insulating housing and is connected to the inlet end of the reaction flow channel on the same side. The liquid outlet pipe is inserted into the side wall of the heat-insulating housing and is connected to the discharge end of the reaction flow channel on the same side. A connecting pipe is fixedly connected between the liquid outlet end and the liquid inlet end of two adjacent reaction flow channels.

[0007] Preferably, each driving unit includes an electric push rod fixedly inserted into the top of the heat-insulating housing. A strip-shaped groove plate is installed at the telescopic end of the electric push rod. A screw rod transmission assembly is installed inside the strip-shaped groove plate and is used to drive the heat-insulating block to move in the horizontal direction. The electric push rod and the screw rod transmission assembly are both electrically connected to the controller.

[0008] Preferably, each temperature measuring component includes an infrared temperature measuring probe fixedly installed at the bottom of the installation groove. A heat-insulating gasket is sleeved outside the infrared temperature measuring probe, and the heat-insulating gasket is installed at the end of the heat-insulating block. The controller controls the operation of the ultrasonic head according to the electrical signal fed back by the infrared temperature measuring probe.

[0009] Preferably, the temperature control unit includes a fixing plate fixedly installed inside the heat-insulating housing. A plurality of evenly distributed holes are formed in the end face of the fixing plate. The fixing plate is arranged below the reaction channel plate. A cooling medium inlet pipe is fixedly inserted into the bottom of the heat-insulating housing, and a cooling medium discharge pipe is fixedly inserted into the upper end of the side wall of the heat-insulating housing.

[0010] Preferably, a shunt pipe is fixedly inserted into the pipe wall of the cooling medium discharge pipe. A flow meter is installed at the discharge end of the shunt pipe. A secondary proportional solenoid valve is installed inside the shunt pipe. A main proportional solenoid valve is installed on one side of the cooling medium discharge pipe close to the discharge end. The controller controls the opening and closing degrees of the secondary proportional solenoid valve and the main proportional solenoid valve according to the electrical signal fed back by the infrared temperature measuring probe. The flow meter is electrically connected to the controller.

[0011] Preferably, each reaction flow channel includes an inlet section, a discharge section, and a diffusion section. The diffusion section is arranged between the inlet section and the discharge section, and the aperture of the diffusion section is larger than the apertures of the inlet section and the discharge section.

[0012] Preferably, the cooling medium discharge pipe and the shunt pipe are fixedly connected to a confluence box, and a tail pipe is fixedly inserted into the bottom of the confluence box.

[0013] Compared with the existing technology, the advantages of a continuous diazotization safety reaction device for synthesizing arylpyrazole nitrile are as follows: By cooperating with each other among the heat-insulating shell, controller, reaction channel plate, reaction flow channel and connecting components, the microchannel reaction structure can be used to carry out continuous diazotization reaction of aromatic pyrazole nitrile. By cooperating with each other among the heat-insulating block, mounting groove, ultrasonic handpiece and driving unit, during the continuous diazotization reaction of aromatic pyrazole nitrile, ultrasonic vibration of the reaction flow channel can be utilized to avoid the diazonium salt precipitated from the reaction from adhering to the inner wall of the reaction flow channel as much as possible, and the diazonium salt crystals can be prevented from being too large, thereby greatly reducing the possibility of the reaction flow channel being blocked.

[0014] By setting up the temperature measuring component, the location of possible crystal blockage inside the reaction channel can be quickly determined based on the temperature changes around the reaction channel, thereby achieving accurate clearing and good anti-blocking effect. The reaction channel can be inspected during continuous reactions.

[0015] The temperature control unit can be used to conveniently control the temperature of the continuous diazotization reaction of aromatic pyrazole nitrile to ensure the stability of the reaction process. In combination with the shunt pipe, flow meter, auxiliary proportional solenoid valve and main proportional solenoid valve, it is possible to quickly determine whether the reaction process and quality of the reaction channel within a certain period of time are abnormal based on the fluctuation frequency and amplitude of the temperature around the reaction channel, and to promptly alert personnel when an abnormality occurs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a continuous diazotization safety reaction device for synthesizing aryl pyrazole nitrile provided by the present invention; Figure 2 It is a schematic diagram of the internal structure of the heat-insulating shell of a continuous diazotization safety reaction device for synthesizing aryl pyrazole nitrile provided by the present invention; Figure 3 It is a schematic diagram of the internal structure of a reaction channel plate of a continuous diazotization safety reaction device for synthesizing aryl pyrazole nitrile provided by the present invention; Figure 4 This is a schematic diagram of the connection structure of multiple groups of reaction channel plates of a continuous diazotization safety reaction device for synthesizing aromatic pyrazole nitrile provided by the present invention; Figure 5 This is a schematic diagram of the connection structure of a temperature insulation block and a driving unit of a continuous diazotization safety reaction device for synthesizing aryl pyrazole nitrile provided by the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of a temperature-insulating block of a continuous diazotization safety reaction device for synthesizing aryl pyrazole nitrile provided by the present invention; Figure 7 It is a schematic diagram of the three-dimensional structure of a fixed plate of a continuous diazotization safety reaction device for synthesizing aryl pyrazole nitrile provided by the present invention; Figure 8It is a schematic three-dimensional structure diagram of a confluence box of a continuous diazotization safety reaction device for synthesizing arylpyrazole nitrile provided by the present invention; Figure 9 It is a continuous diazotization safety reaction device for synthesizing arylpyrazole nitrile provided by the present invention Figure 3 The enlarged structure diagram of part A in it.

[0017] In the figure: 1 heat preservation outer shell, 2 controller, 3 reaction channel plate, 4 reaction flow channel, 41 inlet section, 42 discharge section, 43 diffusion section, 5 connection component, 51 liquid inlet pipe, 52 liquid outlet pipe, 53 connecting pipe, 6 heat insulation block, 7 installation groove, 8 ultrasonic head, 9 driving unit, 91 electric push rod, 92 strip groove plate, 93 screw rod transmission component, 10 temperature measurement component, 101 infrared temperature measurement probe, 102 heat insulation gasket, 11 temperature control unit, 111 fixing plate, 112 equalizing hole, 113 cooling medium inlet pipe, 114 cooling medium discharge pipe, 12 shunt pipe, 13 flowmeter, 14 secondary proportional solenoid valve, 15 main proportional solenoid valve, 16 confluence box, 17 tail pipe. Specific embodiments

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with 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 the embodiments.

[0019] As Figures 1 - 9 shown, a continuous diazotization safety reaction device for synthesizing arylpyrazole nitrile includes a heat preservation outer shell 1 and a controller 2 arranged on one side of the heat preservation outer shell 1. A plurality of reaction channel plates 3 are arranged inside the heat preservation outer shell 1. A reaction flow channel 4 is arranged between two reaction channel plates 3 in the same group. Each reaction flow channel 4 includes an inlet section 41, a discharge section 42 and a diffusion section 43. The diffusion section 43 is arranged between the inlet section 41 and the discharge section 42, and the aperture of the diffusion section 43 is larger than the apertures of the inlet section 41 and the discharge section 42.

[0020] A connection component 5 is jointly installed on each group of reaction channel plates 3 and the heat preservation outer shell 1. The connection component 5 includes a liquid inlet pipe 51 and a liquid outlet pipe 52. The liquid inlet pipe 51 is inserted into the top of the heat preservation outer shell 1, and the liquid inlet pipe 51 is communicated with the inlet end of the reaction flow channel 4 on the same side. The liquid outlet pipe 52 is inserted into the side wall of the heat preservation outer shell 1, and the liquid outlet pipe 52 is communicated with the discharge end of the reaction flow channel 4 on the same side. A connecting pipe 53 is fixedly connected between the discharge ends and the inlet ends of two adjacent reaction flow channels 4.

[0021] A plurality of heat insulation blocks 6 are respectively arranged between two corresponding groups of reaction channel plates 3. Installation grooves 7 are formed at both ends of each heat insulation block 6, and ultrasonic heads 8 are arranged inside each installation groove 7. A plurality of driving units 9 are all installed on the top of the heat insulation housing 1. The driving unit 9 is used to drive the corresponding heat insulation block 6 to move along the reaction flow channel 4 on the same side. Each driving unit 9 includes an electric push rod 91 fixedly inserted into the top of the heat insulation housing 1, and a strip-shaped groove plate 92 is installed at the telescopic end of the electric push rod 91. A screw rod transmission assembly 93 is installed inside the strip-shaped groove plate 92. The screw rod transmission assembly 93 is used to drive the heat insulation block 6 to move in the horizontal direction. The electric push rod 91 and the screw rod transmission assembly 93 are both electrically connected to the controller 2. The screw rod transmission assembly 93 includes components such as a screw rod, a screw nut, a motor, and a bearing.

[0022] A plurality of temperature measurement components 10 are all arranged inside the corresponding installation grooves 7 for detecting the temperature around the reaction flow channel 4. Each temperature measurement component 10 includes an infrared temperature measurement probe 101 fixedly installed at the bottom of the installation groove 7. A heat insulation gasket 102 is sleeved outside the infrared temperature measurement probe 101, and the heat insulation gasket 102 is installed at the end of the heat insulation block 6. The controller 2 controls the operation of the ultrasonic head 8 according to the electrical signal fed back by the infrared temperature measurement probe 101. The ultrasonic head 8 converts electrical energy into vibration, thereby driving the crystal to break away.

[0023] A temperature control unit 11 is arranged inside the heat insulation housing 1 for controlling the temperature of each group of reaction channel plates 3. The temperature control unit 11 includes a fixing plate 111 fixedly installed inside the heat insulation housing 1. A plurality of evenly distributed holes 112 are formed on the end face of the fixing plate 111. The fixing plate 111 is arranged below the reaction channel plate 3. A cooling medium inlet pipe 113 is fixedly inserted into the bottom of the heat insulation housing 1, and a cooling medium outlet pipe 114 is fixedly inserted into the upper end of the side wall of the heat insulation housing 1. The cooling medium inlet pipe 113 is used to input the cooling medium. The cooling medium can be low-temperature cold air. Before use, the cooling medium inlet pipe 113 needs to be connected to the supply end of an external cooling medium supply device. At the same time, a drainage pipeline is left at the bottom of the heat insulation housing 1 to facilitate the drainage of water generated due to condensation and the like.

[0024] A shunt pipe 12 is fixedly inserted into the pipe wall of the cooling medium outlet pipe 114, and a flow meter 13 is installed at the discharge end of the shunt pipe 12. A sub-proportional solenoid valve 14 is installed inside the shunt pipe 12. A main proportional solenoid valve 15 is installed on one side near the discharge end inside the cooling medium outlet pipe 114. The controller 2 controls the opening and closing degrees of the sub-proportional solenoid valve 14 and the main proportional solenoid valve 15 according to the electrical signal fed back by the infrared temperature measurement probe 101. The flow meter 13 is electrically connected to the controller 2. The main proportional solenoid valve 15 and the sub-proportional solenoid valve 14 can control the opening and closing degree of the valve plate by controlling the input current intensity.

[0025] The cooling medium discharge pipe 114 and the shunt pipe 12 are fixedly connected and communicated with a confluence box 16, and a tail pipe 17 is fixedly inserted at the bottom of the confluence box 16, which is convenient for discharging the medium after heat exchange.

[0026] The operating principle of the present invention is described as follows: The liquid inlet pipe 51 is connected to an external static mixer (the static mixer is connected to the liquid supply end of a plunger pump for pumping raw materials), and the mixed raw materials enter the reaction channel 4 through the liquid inlet pipe 51. The raw materials start to react when passing through the inside of the reaction channel 4, and finally, the raw materials are discharged through the liquid outlet pipe 52. When starting the reaction, the controller 2 is started. The controller 2 will control the screw drive assembly 93 to work. The screw drive assembly 93 will drive the heat insulation block 6 to move in the horizontal front and back directions (the screw drive assembly 93 includes components such as a screw, a screw nut, a motor, and a bearing). The heat insulation block 6 will drive the ultrasonic head 8 and the infrared temperature probe 101 to synchronously move along the reaction channel 4 starting from the liquid inlet end. When the heat insulation block 6 moves to the inflection point of the horizontal and vertical directions of the reaction channel 4, the electric push rod 91 will drive the strip groove plate 92 to move down a certain distance. Subsequently, the screw drive assembly 93 controls the heat insulation block 6 to move again, so that the heat insulation block 6 moves along the reaction channel 4. When moving to the liquid outlet end of the reaction channel 4, the electric push rod 91 drives the heat insulation block 6 to move up to the initial position, and then the above steps are repeated to move cyclically along the reaction channel 4 (the moving speed is 0.5 cm per second). When the heat insulation block 6 is moving, the controller 2 will control the infrared temperature probe 101 to work. Therefore, the infrared temperature probe 101 will detect the temperature at the reaction channel 4. When the diazonium salt generated by the reaction starts to precipitate and adhere to the inner wall of the reaction channel 4, since the adhered diazonium salt will block part of the raw materials flowing downstream, the hydraulic pressure of the raw materials upstream of the crystal increases at this time. Therefore, the temperature at the blockage increases. When the infrared temperature probe 101 detects that the temperature exceeds the threshold value (preset according to the diazotization reaction temperature of the set arylpyrazole nitrile, generally exceeding 5 °C is an unsafe reaction temperature), the intensity of the electrical signal fed back to the controller 2 will also exceed the threshold value. At this time, the controller 2 will control the screw drive assembly 93 or the electric push rod 91 to suspend work, and then control the ultrasonic head 8 to start working. The ultrasonic head 8 will emit ultrasonic waves into the reaction channel 4. Under the action of the ultrasonic waves, the crystals adhered to the inner wall of the reaction channel 4 vibrate under the action of the ultrasonic waves, so that the crystals are separated from the reaction channel 4, avoiding the complete blockage of the reaction channel 4 caused by the cumulative adhesion of the crystals (as the crystals are separated from the reaction channel 4, the temperature here gradually recovers. After the temperature is lower than the threshold value, the controller 2 controls the heat insulation block 6 to continue moving through the drive unit 9). Among them, during the reaction process, the external cooling medium enters the heat preservation housing 1 through the cooling medium discharge pipe 114. The cooling medium contacts each reaction channel plate 3 through the equalizing holes 112 on the fixing plate 111. The cooling medium can take away the heat generated during the reaction, thus avoiding the influence of excessive temperature on the reaction safety. The heat-exchanged cooling medium is discharged through the cooling medium discharge pipe 114. Part of the discharged cooling medium is discharged at the main proportional solenoid valve 15, and the other part is discharged at the secondary proportional solenoid valve 14. The discharged cooling medium enters the confluence box 16 and is finally discharged through the tail pipe 17. When the infrared temperature measurement probe 101 detects that the temperature exceeds the threshold value, and the larger the difference between the temperature exceeding the threshold value, the larger the difference between the electrical signal intensity fed back by the infrared temperature measurement probe 101 to the controller 2 and the electrical signal intensity threshold value. At this time, the controller 2 controls the opening degree of the main proportional solenoid valve 15 to become smaller and controls the opening degree of the secondary proportional solenoid valve 14 to become larger. At this time, more cooling medium passes through the flowmeter 13, so the flow rate measured by the flowmeter 13 is larger. The controller 2 receives the value measured by the flowmeter 13 every 2 minutes and controls the measured value to return to zero. If there are more crystals attached to the inner wall of the reaction flow channel 4 within 2 minutes and the point frequency of the attached crystals is higher, then the value measured by the flowmeter 13 within 2 minutes is higher. When the value exceeds the threshold value (this threshold value is set based on the required reaction flow rate), the controller 2 will immediately sound an alarm to remind the personnel to promptly check the reasons for the large amount and high frequency of crystals attached to the reaction flow channel 4 (for example, insufficient or too low temperature of the cooling medium); Among them, when the raw materials for synthesizing arylpyrazole nitrile flow inside the reaction flow channel 4 and flow to the diffusion section 43, when the raw materials flow out from the two diffusion sections 43, due to the expansion of the pore diameter, the flow rate of the raw materials slows down, and when the raw materials converge from the diffusion section 43 to the discharge section 42, the raw materials will form a turbulent flow due to the change in flow rate, which can be more conducive to the detachment of crystals, has a better anti-blocking effect, and is conducive to improving the mixing effect of the raw materials (wherein, a pressure detection sensor is arranged at the pipe end of the liquid inlet pipe 51 to monitor the raw material injection pressure and stop the machine in time when the pressure exceeds the limit to avoid the influence of excessive pressure on the reaction safety).

[0027] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A continuous diazotization safety reaction device for synthesizing arylpyrazole nitrile, comprising a heat preservation outer shell (1) and a controller (2) arranged on one side of the heat preservation outer shell (1). A plurality of groups of reaction channel plates (3) are arranged inside the heat preservation outer shell (1). A reaction flow channel (4) is arranged between two reaction channel plates (3) in the same group. A communication component (5) is jointly installed on each group of reaction channel plates (3) and the heat preservation outer shell (1), characterized in that, Further included are: A plurality of heat insulation blocks (6), which are respectively arranged between corresponding two groups of reaction channel plates (3). Installation grooves (7) are formed at both ends of each heat insulation block (6), and ultrasonic heads (8) are arranged inside each installation groove (7); A plurality of driving units (9), all installed on the top of the heat preservation housing (1), and the driving units (9) are used to drive the corresponding heat insulation blocks (6) to move along the reaction flow channels (4) on the same side; A plurality of temperature measuring components (10), all arranged inside the corresponding installation grooves (7), and used to detect the temperature around the reaction flow channels (4); A temperature control unit (11), arranged inside the heat preservation housing (1), and used to control the temperature of each group of reaction channel plates (3).

2. The continuous diazotization safety reaction device for synthesizing arylpyrazole nitrile according to claim 1, characterized in that, The connection component (5) includes a liquid inlet pipe (51) and a liquid outlet pipe (52). The liquid inlet pipe (51) is inserted into the top of the heat preservation housing (1), and the liquid inlet pipe (51) is communicated with the inlet end of the reaction flow channel (4) on the same side. The liquid outlet pipe (52) is inserted into the side wall of the heat preservation housing (1), and the liquid outlet pipe (52) is communicated with the discharge end of the reaction flow channel (4) on the same side. A connecting pipe (53) is fixedly connected and communicated between the liquid outlet end and the liquid inlet end of two adjacent reaction flow channels (4).

3. The continuous diazotization safety reaction device for synthesizing arylpyrazole nitrile according to claim 1, characterized in that, Each of the driving units (9) includes an electric push rod (91) fixedly inserted into the top of the heat preservation housing (1), and a strip-shaped groove plate (92) is installed at the telescopic end of the electric push rod (91). A screw rod transmission component (93) is installed inside the strip-shaped groove plate (92), and the screw rod transmission component (93) is used to drive the heat insulation block (6) to move in the horizontal direction. The electric push rod (91) and the screw rod transmission component (93) are both electrically connected to the controller (2).

4. A continuous diazotization safety reaction device for synthesizing arylpyrazole nitrile according to claim 1, characterized in that, Each of the temperature measuring components (10) includes an infrared temperature measuring probe (101) fixedly installed at the bottom of the installation groove (7). A heat insulation gasket (102) is sleeved outside the infrared temperature measuring probe (101), and the heat insulation gasket (102) is installed at the end of the heat insulation block (6). The controller (2) controls the operation of the ultrasonic head (8) according to the electrical signal fed back by the infrared temperature measuring probe (101).

5. The continuous diazotization safety reaction device for synthesizing arylpyrazole nitrile according to claim 1, characterized in that, The temperature control unit (11) includes a fixing plate (111) fixedly installed inside the heat preservation housing (1). A plurality of evenly distributed holes (112) are formed on the end face of the fixing plate (111). The fixing plate (111) is arranged below the reaction channel plate (3). A cooling medium inlet pipe (113) is fixedly inserted into the bottom of the heat preservation housing (1), and a cooling medium discharge pipe (114) is fixedly inserted into the upper end of the side wall of the heat preservation housing (1).

6. The continuous diazotization safety reaction device for synthesizing arylpyrazole nitrile according to claim 5, characterized in that, The pipe wall of the cooling medium discharge pipe (114) is fixedly inserted with a shunt pipe (12), and a flow meter (13) is installed at the discharge end of the shunt pipe (12). A secondary proportional solenoid valve (14) is installed inside the shunt pipe (12), and a primary proportional solenoid valve (15) is installed on one side near the discharge end inside the cooling medium discharge pipe (114). The controller (2) controls the opening and closing degrees of the secondary proportional solenoid valve (14) and the primary proportional solenoid valve (15) according to the electrical signal fed back by the infrared temperature measurement probe (101). The flow meter (13) is electrically connected to the controller (2).

7. A continuous diazotization safety reaction device for synthesizing arylpyrazole nitrile according to claim 1, characterized in that, Each of the reaction flow channels (4) includes an inlet section (41), a discharge section (42), and a diffusion section (43). The diffusion section (43) is arranged between the inlet section (41) and the discharge section (42), and the aperture of the diffusion section (43) is larger than the apertures of the inlet section (41) and the discharge section (42).

8. A continuous diazotization safety reaction device for synthesizing arylpyrazole nitrile according to claim 5, characterized in that, The cooling medium discharge pipe (114) and the shunt pipe (12) are fixedly connected and communicated with a confluence box (16) together, and a tail pipe (17) is fixedly inserted at the bottom of the confluence box (16).

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