Automatic cooling device in production process of o-methylbenzoylformic acid

Abstract

The utility model discloses an automatic cooling device in the production process of o-methylbenzoyl formic acid, which relates to the technical field of packaging bags and comprises a reaction kettle, a cooling device and a control system. The stirring motor is mounted in the reaction kettle and is used for stirring the reaction medium; the stirring motor current sensor is configured in a stirring motor circuit and is used for monitoring the current of the working stirring motor; the decentralized control system is connected with the current sensor and is used for receiving and processing the current signal; the cooling water inlet switch valve is mounted on the cooling water inlet pipeline and connected with the decentralized control system; the cooling water outlet switch valve is positioned in the cooling water loop; according to the utility model, the working current of the stirring motor is directly monitored, so that the change of the reaction thermal load can be sensed earlier and more accurately, the instant cooling response is realized, and the real-time performance and accuracy of temperature control are greatly improved. The quick-response pneumatic valve and the automatically-adjusted cooling water flow control ensure that the cooling water can be quickly led in and out as required.

Description

Technical Field

[0001] The utility model relates to the technical field of packaging bags, in particular to an automatic cooling device in the production process of o-methylbenzoylformic acid. Background Art

[0002] Oxime ether, also known as (E)-2-(2-methylphenyl)-2-methoxyiminoacetic acid methyl ester, is a key intermediate mainly used in methoxyacrylate fungicides such as trifloxystrobin, enoxamyl, and kresoxim-methyl.

[0003]

[0004] Its synthesis uses o-toluic acid as the starting material to react with thionyl chloride to prepare o-toluoyl chloride, which reacts with sodium cyanide to prepare o-toluoyl cyanide, which is then hydrolyzed and esterified to obtain o-methyl keto acid methyl ester, and finally reacts with methoxyamine hydrochloride to replace the keto carbonyl position with an oxime methyl to obtain an oxime ether. The synthetic route is shown in the figure

[0005]

[0006] The advantage of this route is that the synthesis yield of each step is high, all at 85% to 90%, and high-content oxime ether can be obtained. Among them, keto acid must be synthesized first when synthesizing keto esters. When synthesizing keto acid, it will instantly crystallize from the liquid phase reaction system to generate a large amount of solids. At the same time, a large amount of heat is released in a very short time, causing the temperature in the reactor to rise sharply. Since keto acid is extremely unstable, when the temperature in the reactor rises to 50 degrees, it will react with oxygen in the presence of concentrated sulfuric acid to become benzoic acid and carbon dioxide. The reaction formula is as follows:

[0007]

[0008] In order to reduce side reactions, the amount of feed can only be greatly reduced during production. The reactor jacket uses constant temperature water to maintain the reaction temperature while preventing the reactor temperature from rising too quickly. Since keto acid crystallization releases heat too quickly, for safety and process requirements, manufacturers use small-volume equipment in this step of the reaction, and the amount of feed is less than half of the reactor volume. This seriously restricts production capacity, and the conversion rate of this step of the reaction is also below 90%, and the safety factor is not high. Utility Model Content

[0009] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide an automatic cooling device in the production process of o-toluylformic acid to solve the problems in the background technology.

[0010] In view of this, the utility model provides an automatic cooling device in the production process of o-toluylformic acid, comprising:

[0011] A reaction kettle, used to carry the reaction medium;

[0012] A stirring motor is installed inside the reactor to stir the reaction medium;

[0013] The stirring motor current sensor is configured in the stirring motor circuit and is used to monitor the working stirring motor current;

[0014] A distributed control system connected to the current sensor for receiving and processing the current signal;

[0015] The cooling water inlet switch valve is installed on the cooling water inlet pipeline and connected to the distributed control system;

[0016] The cooling water outlet switch valve is located in the cooling water loop and is also connected to the distributed control system. The built-in program of the distributed control system instructs the cooling water inlet switch valve and the cooling water outlet switch valve to interlock according to the step change of the stirring motor current to achieve rapid cooling control.

[0017] Preferably, the stirring motor current sensor is used to accurately capture small and step changes in current.

[0018] Preferably, the cooling water inlet switch valve ensures that it can be opened immediately after receiving the control signal of the distributed control system to quickly introduce cooling water.

[0019] Preferably: the cooling water outlet switch valve is equipped with an automatic regulating device.

[0020] Preferably, the reactor further comprises a reactor jacket, and the reactor jacket comprises:

[0021] The jacket layer is arranged around the reactor body to form a cooling water circulation channel;

[0022] Cooling water inlet interface, connected to the cooling water inlet switch valve;

[0023] The cooling water outlet interface is connected to the cooling water outlet switch valve.

[0024] It can be seen from the above technical solutions that the embodiments of the utility model have the following advantages:

[0025] 1. The automatic cooling device in the production process of o-methylbenzoylformic acid of the utility model can sense the change of reaction heat load earlier and more accurately by directly monitoring the working current of the stirring motor instead of the traditional temperature sensor, and realize the instant cooling response, which greatly improves the real-time and accuracy of temperature control. The fast-response pneumatic valve and the automatically adjusted cooling water flow control ensure that the cooling water can be introduced and discharged quickly and on demand, optimize the heat exchange efficiency, and even the sudden heat release can be quickly controlled to prevent overheating.

[0026] 2. The automatic cooling device for the production process of o-toluylformic acid of the utility model adopts an integrated current-valve interlocking control module, which reduces human intervention and improves the automation level and safety of the production process. At the same time, the fins or corrugated structure of the inner wall of the reactor jacket further improves the cooling efficiency, ensures the effective transfer of heat, helps to maintain the stability of the environment inside the reactor, and improves product quality and production efficiency.

[0027] These features and advantages of the present invention will be disclosed in detail in the following specific implementation manners and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The utility model is further described below in conjunction with the accompanying drawings:

[0029] Figure 1 It is a schematic diagram of the structure of the utility model.

[0030] Explanation of the accompanying drawings: 1. Reactor; 2. Stirring motor; 3. Stirring motor current; 4. Cooling water inlet switch valve; 5. Cooling water outlet switch valve. DETAILED DESCRIPTION

[0031] The following is an explanation and description of the technical scheme of the embodiment of the utility model in conjunction with the drawings of the embodiment of the utility model, but the following embodiment is only a preferred embodiment of the utility model, not all. Based on the embodiment in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the utility model.

[0032] The automatic cooling device in the production process of o-toluoylformic acid according to the embodiment of the utility model is described in detail below with reference to the accompanying drawings.

[0033] Example

[0034] For easier understanding, see Figure 1 , an embodiment of the automatic cooling device in the production process of o-toluoylformic acid provided by the utility model comprises:

[0035] Reactor 1, used for carrying reaction medium;

[0036] A stirring motor 2 is installed inside the reactor and is used to stir the reaction medium;

[0037] A stirring motor current sensor is configured in the stirring motor circuit and is used to monitor the working stirring motor current 3;

[0038] A distributed control system connected to the current sensor for receiving and processing the current signal;

[0039] The cooling water inlet switch valve 4 is installed on the cooling water inlet pipeline and connected to the distributed control system;

[0040] The cooling water outlet switch valve 5 is located in the cooling water loop and is also connected to the distributed control system. The built-in program of the distributed control system instructs the cooling water inlet switch valve 4 and the cooling water outlet switch valve 5 to act in a chain manner according to the step change of the stirring motor current 3, thereby realizing rapid cooling control.

[0041] It should be noted that a stirring motor 2 is installed inside the reactor 1 for mixing the reaction medium. The stirring motor 2 is connected to a stirring motor current sensor through a circuit, which can monitor the stirring motor current 3 of the motor in real time. The current signal is then transmitted to the distributed control system, which integrates advanced control logic and algorithms, can process these current signals, and make cooling control decisions accordingly.

[0042] In an optional embodiment: the stirring motor current sensor has high precision and fast response characteristics, and is used to accurately capture small and step changes in current. The stirring motor current sensor has high precision and fast response characteristics, ensuring that even small or fast changes in current can be immediately captured and accurately recorded, providing a reliable data basis for subsequent cooling control.

[0043] In an optional embodiment: the cooling water inlet switch valve 4 adopts a fast response design to ensure that it can be opened immediately after receiving the control signal of the distributed control system to quickly introduce cooling water. The cooling water inlet switch valve 4 has a fast response mechanism. Once it receives the opening signal sent by the distributed control system, it can be opened immediately to quickly introduce cooling water into the jacket of the reactor to increase the cooling speed.

[0044] In an optional embodiment: the cooling water outlet switch valve 5 is equipped with an automatic regulating device. The cooling water outlet switch valve 5 is equipped with an automatic regulating device, which can dynamically adjust the cooling water flow rate according to actual needs to optimize the efficiency of the entire cooling system.

[0045] In an optional embodiment: the reactor 1 further comprises a reactor jacket, and the reactor jacket comprises:

[0046] The jacket layer is arranged around the reactor body to form a cooling water circulation channel;

[0047] A cooling water inlet interface connected to a cooling water inlet switch valve 4;

[0048] The cooling water outlet interface is connected to the cooling water outlet switch valve 5; the jacket structure design optimizes the heat exchange efficiency to ensure that the cooling water can effectively take away the heat generated by the reaction;

[0049] It should be noted that the reactor 1 is provided with a reactor jacket outside, which surrounds the reactor body to form a cooling water circulation channel, and is provided with a cooling water inlet interface and an outlet interface, which are respectively connected to the cooling water inlet switch valve 4 and the cooling water outlet switch valve 5. The inner wall of the reactor jacket structure is provided with ribs or corrugated structures to enhance the heat exchange efficiency and ensure that the heat can be quickly transferred from the reaction medium to the cooling water and taken away.

[0050] Furthermore, the inner wall of the reactor jacket is provided with fins or a corrugated structure for enhancing heat exchange efficiency.

[0051] Furthermore, a current-valve interlocking control module is integrated in the distributed control system, including:

[0052] The current monitoring unit is responsible for continuously collecting the stirring motor current 3 data;

[0053] A threshold judgment unit, for judging whether to trigger a cooling operation according to a preset current threshold;

[0054] The control output unit sends control signals to the cooling water inlet switch valve 4 and the cooling water outlet switch valve 5; the module can quickly respond to current changes and achieve precise interlocking control.

[0055] It should be noted that the device has an embedded current-valve interlocking control module, which consists of the following three key parts:

[0056] The current monitoring unit continuously collects current data of the stirring motor current 3 .

[0057] The threshold judgment unit judges whether the condition for starting cooling is met according to a preset safety current threshold.

[0058] Once the control output unit determines that cooling needs to be started, it immediately sends a control instruction to the cooling water inlet switch valve 4 and the cooling water outlet switch valve 5 to achieve a rapid interlocking action between the two to ensure timely supply and regulation of cooling water.

[0059] Working principle: After the automatic cooling device is started during the production of o-methylbenzoylformic acid, the reaction kettle 1 is loaded with reaction medium, and the stirring motor starts working to promote uniform mixing of the medium. At the same time, the stirring motor current sensor enters the working state and continuously monitors the current change of the motor. At this stage, the distributed control system is in standby mode, ready to receive and process data from the current sensor. During the reaction process, if the load of the stirring motor increases due to heat release from the chemical reaction or other factors, the motor current will show a step or significant change. The high-precision current sensor immediately captures this change and transmits the current signal to the distributed control system. After the distributed control system receives the current change signal, the built-in current-valve interlocking control module starts to operate. First, the current monitoring unit confirms the exact value of the current; then, the threshold judgment unit analyzes whether the cooling operation needs to be started according to the preset current threshold. Once it is determined that the current exceeds the set safety range, it indicates that the temperature in the reactor 1 may be too high and urgent cooling is required. The control output unit immediately conveys the instruction to the cooling water inlet switch valve 4 and the cooling water outlet switch valve 5. The water inlet valve opens quickly, and the cooling water is introduced through the reactor jacket for heat exchange, effectively absorbing and taking away the excess heat generated by the reaction. At the same time, the cooling water outlet switch valve adjusts the flow of cooling water according to the instructions of the automatic regulating device to ensure maximum cooling efficiency and avoid overcooling.

[0060] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An automatic cooling device in the production process of o-toluylformic acid, characterized in that: include: A reaction kettle (1) for carrying a reaction medium; A stirring motor (2), installed inside the reaction kettle, for stirring the reaction medium; A stirring motor current sensor is arranged in the stirring motor circuit and is used to monitor the stirring motor current (3); A distributed control system connected to the current sensor for receiving and processing the current signal; A cooling water inlet switch valve (4) is installed on the cooling water inlet pipeline and connected to the distributed control system; The cooling water outlet switch valve (5) is located in the cooling water circuit and is also connected to the distributed control system. The built-in program of the distributed control system instructs the cooling water inlet switch valve (4) and the cooling water outlet switch valve (5) to interlock according to the step change of the stirring motor current (3), thereby realizing rapid cooling control.

2. The automatic cooling device in the production process of o-toluylformic acid according to claim 1, characterized in that: The stirring motor current sensor is used to accurately capture the slight and step changes of the current.

3. The automatic cooling device in the production process of o-toluylformic acid according to claim 1, characterized in that: The cooling water inlet switch valve (4) ensures that it can be opened immediately after receiving the control signal of the distributed control system, so as to quickly introduce cooling water.

4. The automatic cooling device in the production process of o-toluylformic acid according to claim 1, characterized in that: The cooling water outlet switch valve (5) is equipped with an automatic regulating device.

5. The automatic cooling device in the production process of o-toluylformic acid according to claim 1, characterized in that: The reactor (1) further comprises a reactor jacket, wherein the reactor jacket comprises: The jacket layer is arranged around the reactor body to form a cooling water circulation channel; A cooling water inlet interface connected to a cooling water inlet switch valve (4); The cooling water outlet interface is connected to the cooling water outlet switch valve (5).

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