Method and system for preparing fluorobenzonitrile

Abstract

The invention relates to the technical field of preparation of fluorobenzonitrile, in particular to a method and system for preparing fluorobenzonitrile. Comprising a raw material processing module, a preprocessing module, a fluorination reaction end, a separation and purification module, a control module and a master control room, the fluorination reaction end comprises a temperature detection module, a pressure detection module and a timing module, and the temperature detection module comprises a temperature sensor unit, a high-temperature early warning prompt unit, a temperature adjusting unit and a comparison module; the comparison module comprises an execution unit, a temperature sensing unit, a controller unit, a feedback unit and a temperature display and output unit, the temperature is accurately detected through the temperature sensor unit, the controller unit carries out processing according to a preset temperature value and a control algorithm, and the feedback unit outputs the temperature display and output unit when the temperature sensor unit detects that the actual temperature is higher than a set value. And the controller unit continues to instruct the execution unit to reduce the heat input until the set temperature is reached, so that the damage to the material is reduced, and the yield is improved.

Description

Technical Field

[0001] The invention relates to the technical field of preparing fluorobenzonitrile, and in particular to a method and a system for preparing fluorobenzonitrile. Background Art

[0002] Fluorobenzonitrile is an organic compound with the molecular formula C7H4FN. It is liquid at room temperature and soluble in solvents such as ethanol, ether, and acetone. Fluorobenzonitrile is widely used in the fields of medicine and pesticides. It can be used as a drug intermediate to synthesize a variety of drugs, such as anti-tumor drugs, antifungal drugs, and antiviral drugs; in addition, it can also be used as a pesticide intermediate to synthesize a variety of pesticides, such as insecticides, fungicides, and herbicides.

[0003] However, in the prior art, a relatively high temperature is maintained during the fluorination process, which causes more damage to the material and affects the yield. Summary of the invention

[0004] The object of the present invention is to provide a method and system for preparing fluorobenzonitrile, aiming to solve the technical problem that in the fluorination process of the original process in the prior art, a relatively high temperature is always maintained, which leads to more damage to the material and affects the yield.

[0005] To achieve the above-mentioned purpose, the present invention adopts a system for preparing fluorobenzonitrile, comprising a raw material processing module, a pretreatment module, a fluorination reaction end, a separation and purification module, a control module and a general control room, wherein the fluorination reaction end comprises a temperature detection module, a pressure detection module and a timing module, wherein the temperature detection module comprises a temperature sensor unit, a high temperature warning prompt unit, a temperature adjustment unit and a comparison module, wherein the comparison module comprises an execution unit, a temperature sensing unit, a controller unit, a feedback unit and a temperature display and output unit, wherein the pressure detection module comprises a pressure sensor unit, a high and low pressure warning prompt unit and a pressure adjustment unit, wherein the timing module comprises a time base unit, an input and output unit, a control unit and an interrupt and DMA processing unit, wherein the raw material processing module, the pretreatment module, the fluorination reaction end, the separation and purification module and the control module are all connected to the general control room;

[0006] The raw material processing module is responsible for receiving and preparing raw materials, and the raw materials include fluorobenzonitrile and anhydrous potassium fluoride;

[0007] The pretreatment module is used for drying and purification;

[0008] The fluorination reaction end is used to carry out a fluorination reaction under specific reaction conditions to generate benzonitrile and a fluorinated mixed salt;

[0009] The temperature sensor unit is used to accurately detect the temperature;

[0010] The high temperature warning prompt unit is used to give a warning prompt when the temperature is too high;

[0011] The temperature adjustment unit is used to adjust the temperature.

[0012] The execution unit is used to control the signal to adjust the input and discharge of heat;

[0013] The temperature sensing unit is used to sense the temperature change of the environment and convert it into an electrical signal to transmit to the controller unit;

[0014] The controller unit is used to receive signals from the temperature sensing element and process them according to a preset temperature value and a control algorithm;

[0015] The feedback unit is used to continuously adjust the control strategy. When the temperature sensor unit detects that the actual temperature is higher than the set value, the controller unit will continue to instruct the execution unit to reduce the heat input until the set temperature is reached;

[0016] The temperature display and output unit is used to display the detected stability and transmit it to the PLC via industrial standard signals;

[0017] The pressure detection module is used to detect, warn and adjust the pressure;

[0018] The separation and purification module is used to process the product after the fluorination reaction;

[0019] The main control room is used to control the entire system.

[0020] Wherein, the raw material processing module includes a raw material receiving unit and a material preparation unit, and both the raw material receiving unit and the material preparation unit are connected to the main control room;

[0021] The raw material receiving unit is used to add and receive raw materials through a conveyor belt;

[0022] The material preparation unit is used for storing raw materials.

[0023] Wherein, the pretreatment module includes a drying unit and a purification unit, and both the drying unit and the purification unit are connected to the main control room;

[0024] The drying unit is used to remove moisture and other volatile substances in the raw materials;

[0025] The purification unit is used to improve the purity and yield of raw materials.

[0026] Wherein, the separation and purification module includes a cooling unit and a filtration unit, and both the cooling unit and the filtration unit are connected to the main control room;

[0027] The cooling unit is used to cool the raw material after fluorination;

[0028] The suction filtration unit is used to remove impurities in the raw material.

[0029] Wherein, the separation and purification module further comprises a distillation unit, and the distillation unit is connected to the general control room;

[0030] The distillation unit is used to purify and separate raw materials.

[0031] Wherein, the control module includes a monitoring unit and an operating unit, and both the monitoring unit and the operating unit are connected to the main control room;

[0032] The monitoring unit is used to monitor key parameters in the chemical reaction process in real time;

[0033] The operation unit is used to ensure that the reaction is carried out safely and efficiently according to the established route.

[0034] The present invention also provides a method for preparing fluorobenzonitrile, which is applied to the above-mentioned system for preparing fluorobenzonitrile, comprising the following steps:

[0035] S1: First, the raw material is delivered to the raw material receiving unit through the material preparation unit; at the same time, the drying process and the purification process are completed under the action of the drying unit and the purification unit;

[0036] S2: Subsequently, the raw material is sent to the fluorination reaction end, the temperature and pressure of the preparation environment are accurately detected by the temperature detection module and the pressure detection module, and the accurate fluorination reaction process is realized under the action of the timing module;

[0037] S3: Finally, the fluorinated reactants are passed through the cooling unit, the filtration unit and the distillation unit to complete the processes of cooling, filtration of impurities and purity distillation.

[0038] A method and system for preparing fluorobenzonitrile of the present invention comprises a raw material processing module, a pretreatment module, a fluorination reaction end, a separation and purification module, a control module and a general control room, wherein the fluorination reaction end comprises a temperature detection module, a pressure detection module and a timing module, wherein the temperature detection module comprises a temperature sensor unit, a high temperature warning prompt unit, a temperature adjustment unit and a comparison module, wherein the comparison module comprises an execution unit, a temperature sensing unit, a controller unit, a feedback unit and a temperature display and output unit, wherein the pressure detection module comprises a pressure sensor unit, a high and low pressure warning prompt unit and a pressure adjustment unit, wherein the timing module comprises a time base unit, an input and output unit, a control unit and an interrupt and DMA processing unit, wherein the raw material processing module, the pretreatment module, the fluorination reaction end, the separation and purification module and the control module They are all connected to the main control room, and are used to accurately detect the temperature through the temperature sensor unit. The high temperature early warning prompt unit is used to give an early warning when the temperature is too high. The temperature adjustment unit is used to adjust the temperature. The execution unit is used to control the signal to adjust the input and discharge of heat. The temperature sensing unit is used to sense the temperature change of the environment and convert it into an electrical signal to transmit to the controller unit. The controller unit is used to receive the signal from the temperature sensing element and process it according to the preset temperature value and control algorithm. The feedback unit is used to continuously adjust the control strategy. When the temperature sensor unit detects that the actual temperature is higher than the set value, the controller unit will continue to instruct the execution unit to reduce the heat input until the set temperature is reached, thereby effectively reducing the damage to the material and improving the yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 It is a schematic diagram of the principle of the system for preparing fluorobenzonitrile of the present invention.

[0041] Figure 2 The present invention is a flow chart of the steps of a method for preparing fluorobenzonitrile.

[0042] 1-Raw material processing module, 2-Pretreatment module, 3-Fluorination reaction end, 4-Separation and purification module, 5-Control module, 6-General control room, 7-Temperature detection module, 8-Pressure detection module, 9-Timing module, 10-Temperature sensor unit, 11-High temperature warning prompt unit, 12-Temperature adjustment unit, 13-Comparison module, 14-Execution unit, 15-Temperature sensing unit, 16-Controller unit, 17-Feedback unit, 18-Temperature display and output unit, 19-Pressure sensor unit, 20-High and low pressure warning prompt unit, 21-Pressure force regulation unit, 22-time base unit, 23-input and output unit, 24-control unit, 25-interrupt and DMA processing unit, 26-raw material receiving unit, 27-material preparation unit, 28-drying unit, 29-purification unit, 30-cooling unit, 31-filtration unit, 32-distillation unit, 33-monitoring unit, 34-operation unit, 35-recovery module, 36-safety module, 37-washing unit, 38-water treatment unit, 39-evaporation unit, 40-emergency shutdown unit, 41-pressure relief protection unit, 42-alarm unit. DETAILED DESCRIPTION

[0043] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0044] See also Figure 1 The present invention provides a system for preparing fluorobenzonitrile, comprising a raw material processing module 1, a pretreatment module 2, a fluorination reaction end 3, a separation and purification module 4, a control module 5 and a general control room 6, wherein the fluorination reaction end 3 comprises a temperature detection module 7, a pressure detection module 8 and a timing module 9, wherein the temperature detection module 7 comprises a temperature sensor unit 10, a high temperature warning prompt unit 11, a temperature adjustment unit 12 and a comparison module 13, wherein the comparison module 13 comprises an execution unit 14, a temperature sensing unit 15, a controller unit 16, a feedback unit 17 and a temperature display and output unit 18, wherein the pressure detection module 8 comprises a pressure sensor unit 19, a high and low pressure warning prompt unit 20 and a pressure adjustment unit 21, wherein the timing module 9 comprises a time base unit 22, an input and output unit 23, a control unit 24 and an interrupt and DMA processing unit 25, wherein the raw material processing module 1, the pretreatment module 2, the fluorination reaction end 3, the separation and purification module 4 and the control module 5 are all connected to the general control room 6;

[0045] The raw material processing module 1 is responsible for receiving and preparing raw materials, and the raw materials include fluorobenzonitrile and anhydrous potassium fluoride;

[0046] The pretreatment module 2 is used for drying and purification;

[0047] The fluorination reaction end 3 is used to carry out a fluorination reaction under specific reaction conditions to generate benzonitrile and a fluorinated mixed salt;

[0048] The temperature sensor unit 10 is used to accurately detect the temperature;

[0049] The high temperature warning prompt unit 11 is used to give a warning prompt when the temperature is too high;

[0050] The temperature adjustment unit 12 is used to adjust the temperature;

[0051] The execution unit 14 is used to control the signal to adjust the input and discharge of heat;

[0052] The temperature sensing unit 15 is used to sense the temperature change of the environment and convert it into an electrical signal to transmit to the controller unit 16;

[0053] The controller unit 16 is used to receive signals from the temperature sensing element and process them according to a preset temperature value and a control algorithm;

[0054] The feedback unit 17 is used to continuously adjust the control strategy. When the temperature sensor unit 10 detects that the actual temperature is higher than the set value, the controller unit 16 will continue to instruct the execution unit 14 to reduce the heat input until the set temperature is reached;

[0055] The temperature display and output unit 18 is used to display the detected stability and transmit it to the PLC via industrial standard signals;

[0056] The pressure detection module 8 is used to detect, warn and adjust the pressure;

[0057] The separation and purification module 4 is used to process the product after the fluorination reaction;

[0058] The main control room 6 is used to control the entire system.

[0059] In this embodiment, the temperature sensor unit 10 is used to accurately detect the temperature, the high temperature warning prompt unit 11 is used to give a warning when the temperature is too high, the temperature adjustment unit 12 is used to adjust the temperature, the execution unit 14 is used to control the signal to adjust the input and discharge of heat, the temperature sensing unit 15 is used to sense the temperature change of the environment, and convert it into an electrical signal to transmit to the controller unit 16, the controller unit 16 is used to receive the signal from the temperature sensing element, and process it according to the preset temperature value and control algorithm, the feedback unit 17 is used to continuously adjust the control strategy, when the temperature sensor unit 10 detects that the actual temperature is higher than the set value, the controller unit 16 will continue to instruct the execution unit 14 to reduce the heat input until the set temperature is reached, thereby effectively reducing the damage to the material and improving the yield.

[0060] Further, the raw material processing module 1 includes a raw material receiving unit 26 and a material preparation unit 27, and both the raw material receiving unit 26 and the material preparation unit 27 are connected to the main control room 6;

[0061] The raw material receiving unit 26 is used to add and receive raw materials through a conveyor belt;

[0062] The material preparation unit 27 is used to store raw materials.

[0063] In this embodiment, during the feeding process, high-precision weighing equipment is first used to complete the weighing operation. At the same time, automated equipment is used to realize feeding and feeding, and through program-controlled equipment such as pumps and valves, precise control and continuous addition of raw materials can be achieved; in the preparation area, the raw materials need to be pretreated, including checking the purity and state of the raw materials to ensure that they meet the quality standards required by production; pretreatment may also include crushing, screening and mixing of the raw materials to ensure uniform reaction during the reaction process to avoid a decrease in yield or danger due to uneven materials.

[0064] Further, the pretreatment module 2 includes a drying unit 28 and a purification unit 29, and both the drying unit 28 and the purification unit 29 are connected to the main control room 6;

[0065] The drying unit 28 is used to remove moisture and other volatile substances in the raw materials;

[0066] The purification unit 29 is used to improve the purity and yield of the raw materials.

[0067] In this embodiment, after the reaction of chlorobenzonitrile and anhydrous potassium fluoride, the reaction mixture often contains a large amount of wet solvent and other volatile components; after the chemical reaction is completed, the mixed solution is usually separated from the solid and liquid by a filter press or centrifugal separation. This step is mainly to remove insoluble impurities and part of the water to reduce the load for subsequent drying. At this time, vacuum drying is used; this method reduces the pressure of the drying system so that the solvent can evaporate quickly at low temperatures, thereby avoiding damage to the product caused by high temperature; at the same time, through column chromatography separation technology, impurities such as 3,4-dichlorobenzonitrile can be effectively removed to obtain a high-purity product.

[0068] Furthermore, the separation and purification module 4 includes a cooling unit 30 and a filtration unit 31, and both the cooling unit 30 and the filtration unit 31 are connected to the main control room 6;

[0069] The cooling unit 30 is used to cool the raw material after fluorination;

[0070] The suction filtration unit 31 is used to remove impurities in the raw material.

[0071] In this embodiment, preliminary cooling is completed by circulating cooling water or cooling medium to quickly absorb and take away the heat generated by the reaction. After preliminary cooling, the raw materials are transported to a heat exchanger for more precise temperature control; the heat exchanger achieves precise control of the material temperature by adjusting the flow and temperature of the cooling medium; the suction filtration bottle is fixed in an appropriate position, the filter paper and the filter medium are placed, and then the suction filtration bottle is connected to the vacuum pump through a vacuum pipeline; the reaction mixture is slowly poured into the suction filtration device, and the vacuum pump is turned on at the same time, and the vacuum degree is adjusted so that the filtrate can evenly pass through the filter paper and be collected in the suction filtration bottle.

[0072] Furthermore, the separation and purification module 4 further includes a distillation unit 32, and the distillation unit 32 is connected to the main control room 6;

[0073] The distillation unit 32 is used to purify and separate the raw materials.

[0074] In this embodiment, a continuous distillation method is adopted to achieve high-purity separation through multiple partial vaporizations and multiple partial condensations; the distillation tower is equipped with multiple layers of tower plates or fillers so that the rising steam and the descending liquid can fully contact to achieve mass transfer and heat transfer, and the distillation effect can be controlled by adjusting the reflux ratio, that is, the ratio of reflux liquid to produced liquid.

[0075] Furthermore, the control module 5 includes a monitoring unit 33 and an operating unit 34, and both the monitoring unit 33 and the operating unit 34 are connected to the main control room 6;

[0076] The monitoring unit 33 is used to monitor key parameters in the chemical reaction process in real time;

[0077] The operation unit 34 is used to ensure that the reaction proceeds safely and efficiently according to the established route.

[0078] In this embodiment, the monitoring unit 33 ensures the controllability and safety of the production process and improves the quality and yield of the product by means of real-time data collection, component analysis, video monitoring, security monitoring, data recording and analysis; the operating unit ensures that the reaction is carried out safely and efficiently along the established route by precisely controlling the reaction conditions, strictly following the process flow and implementing real-time monitoring.

[0079] Furthermore, the system for preparing fluorobenzonitrile further comprises a recovery module 35 and a safety module 36, and both the recovery module 35 and the safety module 36 are connected to the main control room 6;

[0080] The recovery module 35 is used to separate and recover the oxidized mixed salt including potassium fluoride and potassium chloride;

[0081] The security module 36 is used to monitor the security protection of the entire system in real time.

[0082] In this embodiment, the recovery module 35 first performs heat treatment on the oxidized mixed salt to remove organic waste in the mixture, and then achieves preliminary separation by controlling the temperature and concentration according to the difference in solubility of potassium chloride and potassium fluoride at different temperatures. The solubility of potassium chloride in water increases with increasing temperature, so potassium chloride can be enriched by heating a solution rich in potassium chloride and cooling it; after potassium fluoride and potassium chloride mixture is dissolved in water, quartz sand and fluorosilicic acid are added in proportion to react, the reaction temperature and pH value are controlled, and potassium fluorosilicate solid and potassium chloride clear liquid are obtained by solid-liquid separation; chlorine in potassium chloride is replaced by hydrofluoric acid to obtain potassium hydrogen fluoride, and potassium fluoride is recovered by steps such as concentration, crystallization and high-temperature drying; potassium fluoride is reacted with boron trifluoride in a certain proportion in an acetonitrile solution, and reacted under reflux conditions for 5 to 24 hours to convert potassium fluoride into potassium tetrafluoroborate; the mixed solution after the reaction is filtered to remove unreacted potassium chloride, and the filtrate containing potassium tetrafluoroborate is further concentrated, crystallized, dried or spray-dried to finally obtain pure potassium tetrafluoroborate, and potassium chloride is separated at the same time; finally, the temperature and concentration of the solution are adjusted to achieve further purification of potassium chloride, and the purity of potassium chloride can be further improved by using the double decomposition reaction of potassium chloride with other compounds (such as magnesium sulfate).

[0083] In this embodiment, the security module comprehensively ensures the security protection of the entire system through a variety of technologies and methods; from network isolation, access control to the application of encryption technology, to authentication mechanism, security audit and real-time monitoring, as well as anti-attack mechanism and system security enhancement technology.

[0084] Further, the recovery module 35 is connected to a washing unit 37, a water treatment unit 38 and an evaporation unit 39;

[0085] The washing unit 37 is used to remove impurities in the reaction mixture to improve the purity and yield of the product;

[0086] The water treatment unit 38 is used to treat and purify wastewater generated during the production process to ensure that the wastewater meets environmental protection standards before being discharged into the environment;

[0087] The evaporation unit 39 is used to remove the solvent and unreacted substances in the reaction mixture to promote the purification of the product and improve the purity of the final product.

[0088] In this embodiment, the washing unit 37 is used to remove impurities in the reaction mixture and improve the purity and yield of the product; the water treatment unit 38 is used to treat and purify the wastewater generated in the production process to ensure that the wastewater meets environmental protection standards before being discharged into the environment; the evaporation unit 39 is used to remove the solvent and unreacted substances in the reaction mixture to promote the purification of the product and improve the purity of the final product.

[0089] Furthermore, the safety module 36 includes an emergency stop unit 40 , a pressure relief protection unit 41 and an alarm unit 42 , and the emergency stop unit 40 , the pressure relief protection unit 41 and the alarm unit 42 are all connected to the main control room 6 .

[0090] The emergency stop unit 40 is used to quickly stop the production process in the event of an emergency or abnormality to ensure personnel safety and equipment protection;

[0091] The pressure relief protection unit 41 is used to automatically release the pressure when the system pressure exceeds the safety range to prevent equipment damage or safety accidents caused by overpressure;

[0092] The alarm unit 42 is used to monitor key parameters in the production process and issue an alarm when an abnormal situation is detected so that the operator can take timely measures.

[0093] In this embodiment, the emergency stop unit 40 is used to quickly stop the production process in an emergency or abnormality to ensure personnel safety and equipment protection; the pressure relief protection unit 41 is used to automatically release pressure when the system pressure exceeds a safe range to prevent equipment damage or safety accidents caused by overpressure; the alarm unit 42 is used to monitor key parameters in the production process and issue an alarm when an abnormal situation is detected so that the operator can take timely measures.

[0094] Based on the present invention, please refer to Figure 2 The present invention also provides a method for preparing fluorobenzonitrile, which is applied to the above-mentioned system for preparing fluorobenzonitrile, comprising the following steps:

[0095] S1: First, the raw material is delivered to the raw material receiving unit 26 through the material preparation unit 27; at the same time, the drying process and the purification process are completed under the action of the drying unit 28 and the purification unit 29;

[0096] S2: Subsequently, the raw material is sent to the fluorination reaction end 3, and the temperature and pressure of the preparation environment are accurately detected by the temperature detection module 7 and the pressure detection module, and the accurate fluorination reaction process is realized under the action of the timing module 9;

[0097] S3: Finally, the fluorinated reactants are passed through the cooling unit 30, the filtration unit 31 and the distillation unit 32 to complete the processes of cooling, filtering impurities and purity distillation.

[0098] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A system for preparing fluorobenzonitrile, characterized in that: It includes a raw material processing module, a pretreatment module, a fluorination reaction end, a separation and purification module, a control module and a general control room, the fluorination reaction end includes a temperature detection module, a pressure detection module and a timing module, the temperature detection module includes a temperature sensor unit, a high temperature warning prompt unit, a temperature adjustment unit and a comparison module, the comparison module includes an execution unit, a temperature sensing unit, a controller unit, a feedback unit and a temperature display and output unit, the pressure detection module includes a pressure sensor unit, a high and low pressure warning prompt unit and a pressure adjustment unit, the timing module includes a time base unit, an input and output unit, a control unit and an interrupt and DMA processing unit, the raw material processing module, the pretreatment module, the fluorination reaction end, the separation and purification module and the control module are all connected to the general control room; The raw material processing module is responsible for receiving and preparing raw materials, and the raw materials include fluorobenzonitrile and anhydrous potassium fluoride; The pretreatment module is used for drying and purification; The fluorination reaction end is used to carry out a fluorination reaction under specific reaction conditions to generate benzonitrile and a fluorinated mixed salt; The temperature sensor unit is used to accurately detect the temperature; The high temperature warning prompt unit is used to give a warning prompt when the temperature is too high; The temperature adjustment unit is used to adjust the temperature. The execution unit is used to control the signal to adjust the input and discharge of heat; The temperature sensing unit is used to sense the temperature change of the environment and convert it into an electrical signal to transmit to the controller unit; The controller unit is used to receive signals from the temperature sensing element and process them according to a preset temperature value and a control algorithm; The feedback unit is used to continuously adjust the control strategy. When the temperature sensor unit detects that the actual temperature is higher than the set value, the controller unit will continue to instruct the execution unit to reduce the heat input until the set temperature is reached; The temperature display and output unit is used to display the detected stability and transmit it to the PLC via industrial standard signals; The pressure detection module is used to detect, warn and adjust the pressure; The separation and purification module is used to process the product after the fluorination reaction; The main control room is used to control the entire system.

2. The system for preparing fluorobenzonitrile according to claim 1, characterized in that: The raw material processing module includes a raw material receiving unit and a material preparation unit, and both the raw material receiving unit and the material preparation unit are connected to the main control room; The raw material receiving unit is used to add and receive raw materials through a conveyor belt; The material preparation unit is used for storing raw materials.

3. The system for preparing fluorobenzonitrile according to claim 2, characterized in that: The pretreatment module includes a drying unit and a purification unit, and both the drying unit and the purification unit are connected to the main control room; The drying unit is used to remove moisture and other volatile substances in the raw materials; The purification unit is used to improve the purity and yield of raw materials.

4. The system for preparing fluorobenzonitrile according to claim 3, characterized in that: The separation and purification module includes a cooling unit and a filtration unit, and both the cooling unit and the filtration unit are connected to the main control room; The cooling unit is used to cool the raw material after fluorination; The suction filtration unit is used to remove impurities in the raw material.

5. The system for preparing fluorobenzonitrile according to claim 4, characterized in that: The separation and purification module also includes a distillation unit, which is connected to the main control room; The distillation unit is used to purify and separate raw materials.

6. The system for preparing fluorobenzonitrile according to claim 5, characterized in that: The control module includes a monitoring unit and an operating unit, and both the monitoring unit and the operating unit are connected to the main control room; The monitoring unit is used to monitor key parameters in the chemical reaction process in real time; The operation unit is used to ensure that the reaction is carried out safely and efficiently according to the established route.

7. A method for preparing fluorobenzonitrile, applied to the system for preparing fluorobenzonitrile as claimed in claim 6, characterized in that: The steps include: S1: First, the raw material is delivered to the raw material receiving unit through the material preparation unit; at the same time, the drying process and the purification process are completed under the action of the drying unit and the purification unit; S2: Subsequently, the raw material is sent to the fluorination reaction end, the temperature and pressure of the preparation environment are accurately detected by the temperature detection module and the pressure detection module, and the accurate fluorination reaction process is realized under the action of the timing module; S3: Finally, the fluorinated reactants are passed through the cooling unit, the filtration unit and the distillation unit to complete the processes of cooling, filtration of impurities and purity distillation.

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