A device and method for preparing high content salicylic acid

Abstract

The application provides a high-content salicylic acid preparation device and method, which comprises a mounting cavity, a reaction cylinder is fixedly installed on the top of the mounting cavity, a communicating injection port is butt-jointed on one side of the reaction cylinder, a washing structure is fixedly installed on the upper part in the reaction cylinder, a separated air guide structure is fixedly installed on the lower part in the reaction cylinder, a transmission mechanism extending to the inside is fixedly installed on the top of the reaction cylinder and penetrates the washing structure and the separated air guide structure, a air-drying structure is hung on the bottom of the transmission mechanism, and a variable-direction air guide mechanism and a flue gas purification structure are fixedly installed in the mounting cavity. The flue gas purification structure is used for purifying and filtering the waste entering the inside, the effect is that the device not only completes the preparation operation, but also can recycle and purify the flue gas generated during the preparation, and the variable-direction air guide mechanism makes the device have a good variable-direction effect.

Description

Technical Field

[0001] This invention relates to the field of salicylic acid production technology, specifically to a device and method for preparing high-content salicylates. Background Technology

[0002] Salicylic acid, also known as salicylic acid, is a high-content salicylic acid ingredient used in cleansing cosmetics. It is commonly used to regulate skin keratin metabolism and promote skin regeneration.

[0003] It has antibacterial, anti-inflammatory, dead skin cell removal, and pore-minimizing effects, leaving skin smoother and more refined. However, it's important to note that high-concentration salicylic acid is highly irritating and not suitable for all skin types. Sensitive and dry skin should use it with caution. Before using cosmetics with high-concentration salicylic acid, it is recommended to test a small amount first and maintain adequate hydration to avoid adverse skin reactions.

[0004] In preparation, high-content salicylic acid is obtained through chemical synthesis of salicylic acid. Specifically, salicylic acid is reacted with a dilute alkali (such as NaOH or KOH) to produce sodium salicylate or potassium salicylate. Then, the resulting sodium salicylate or potassium salicylate solution is treated with carbon dioxide, allowing it to gradually react and generate high-content salicylic acid. Finally, pure high-content salicylic acid crystals are obtained through filtration, washing, and other steps. It is important to note that high-content salicylic acid is a relatively strong chemical substance, and improper use may cause skin irritation. Therefore, strict control of reaction conditions and application methods is necessary during both preparation and use.

[0005] The above explanation provides an understanding of the material costs of salicylic acid and its preparation methods. However, the current preparation process for high-content salicylic acid still has several shortcomings: existing processes require large amounts of reactants and multiple processing steps, leading to waste of materials and energy and increased costs. Furthermore, the reaction generates significant amounts of flue gas, primarily composed of sulfur dioxide and nitrogen oxides. These gases are harmful to human health and also impact the environment when released. Therefore, effective improvements and optimizations to the existing preparation process are necessary. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a device and method for preparing high-content salicylic acid, solving the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A high-content salicylic acid preparation device includes an installation cavity, a reaction cylinder fixedly installed on the top of the installation cavity, and a connecting injection port installed on one side of the reaction cylinder. A washing structure is fixedly installed in the upper part of the reaction cylinder, and a separate gas guiding structure is fixedly installed in the lower part of the reaction cylinder. A transmission mechanism extending into the interior is fixedly installed on the top of the reaction cylinder and penetrates the washing structure and the separate gas guiding structure. A drying structure is suspended at the bottom of the transmission mechanism. A reversible gas guiding mechanism and a flue gas purification structure are fixedly installed inside the installation cavity. The reversible gas guiding mechanism is assembled and connected with the flue gas purification structure and the components inside the reaction cylinder.

[0009] The flue gas purification structure includes a housing, a purification component, an exhaust component one, and an exhaust component two. The housing is fixedly installed inside the mounting cavity, and the purification component is fixedly installed inside the housing. Exhaust component two and exhaust component one are connected and installed in the housing on one side of the purification component, and the ports of exhaust component two and exhaust component one correspond to each other.

[0010] Furthermore, the separate gas guiding structure includes a separation chamber, an insertion interface, and a filter screen. The separation chamber is fixedly installed inside the reaction cylinder, and several insertion interfaces are evenly distributed at the bottom of the separation chamber. A filter screen is fixedly installed at the port of the separation chamber, and a negative pressure outlet is provided on the reaction cylinder at the top of the separate gas guiding structure.

[0011] Furthermore, the transmission mechanism includes a hollow guide rod, a lifting structure, an electric heating block, stirring blades, a temperature sensor, and a motor. The hollow guide rod is installed at the top of the reaction cylinder, and three sets of stirring blades are fixedly installed at the bottom of the hollow guide rod. An electric heating block is fitted on the hollow guide rod, and a temperature sensor is fixedly installed on the hollow guide rod below the electric heating block. A lifting structure is fixedly installed inside the hollow guide rod, and the lifting structure lifts the drying structure. A motor that is rotatably connected to the hollow guide rod is fixedly installed at the top of the reaction cylinder.

[0012] Furthermore, the hoisting structure includes an electric push rod, a lifting rod, a connector, a connecting rod, and a hanging seat. An electric push rod is fixedly installed inside the hollow guide rod. The bottom of the electric push rod is connected to the lifting rod via the connector. The bottom of the lifting rod is connected to the connecting rod, which extends out of the hollow guide rod and penetrates the air-drying structure. The bottom of the connecting rod is connected to the hanging seat.

[0013] Furthermore, the washing structure includes a water guiding cavity, nozzles, and a water receiving head. The water guiding cavity is fixedly installed at the top of the reaction cylinder, and several nozzles are evenly distributed at the bottom of the water guiding cavity. A water receiving head connected to the water guiding cavity is installed on the outside of the reaction cylinder.

[0014] Furthermore, the purification component includes an inner box, a thermal catalytic layer, an air guide channel one, an activated carbon adsorption layer, an air guide channel two, and a partition. The inner box is fixedly installed inside the box, and three sets of thermal catalytic layers are assembled inside the inner box. A partition is fixedly installed inside the box between the inner box and the exhaust component one. An air guide channel two that penetrates the partition is installed on one side of the inner box, and an air guide channel one that extends out of the inner box is installed on the other side. Both air guide channels one and two are filled with activated carbon adsorption layers.

[0015] Furthermore, an air supply pipe 2 that connects to the exhaust component 2 is fixedly installed on one side of the box, and an air supply pipe 1 that connects to the exhaust component 1 is fixedly installed on the top of the box.

[0016] Furthermore, the variable-direction air guiding mechanism includes a fan, an external air inlet, an exhaust pipe, a T-connector 1, a T-connector 2, an air guiding pipe, an air exchange pipe, and a solenoid valve. The fan is fixedly installed at the bottom of the mounting cavity. The output end of the fan is connected to T-connector 2, and the input end is connected to T-connector 1. The ports of T-connector 2 are respectively connected to the air guiding pipe and the air exchange pipe. The ports of T-connector 1 are respectively connected to the external air inlet and the exhaust pipe. Solenoid valves are installed on the external air inlet, the exhaust pipe, the air guiding pipe, and the air exchange pipe. The exhaust pipe is connected to the reaction cylinder, the air guiding pipe is connected to the drying structure, and the air exchange pipe is connected to the exhaust component 1.

[0017] Furthermore, the air-drying structure includes an air-guiding chamber, an air-guiding head, and an air-guiding nozzle. An air-guiding chamber is suspended between the connecting rod and the hanging base. Communicating air-guiding heads are evenly distributed at the bottom of the air-guiding chamber, and communicating air-guiding nozzles are provided on the air-guiding heads. The air-guiding chamber is connected to the air-guiding pipe.

[0018] The working method of the high-content salicylic acid preparation device includes the following steps:

[0019] Step 1: Refined phenol and nitric acid are injected into the reaction cylinder through the injection port. The transmission mechanism is activated to stir the mixture. The transmission mechanism heats and stirs the internal materials through an electric heating block and stirring blades, and controls the heating temperature during the preparation process.

[0020] Step 2: Under the continuous stirring of the transmission mechanism, sodium hydroxide solution is injected, and the variable-direction gas guiding mechanism is activated to extract the flue gas generated by the reaction and mix, and introduce it into the flue gas purification structure for purification treatment.

[0021] Step 3: The externally introduced water is used to wash the reactants through the washing structure. After the reactants are separated by the separation-type gas guiding structure, they become yellow solids. The flue gas is introduced into the flue gas purification structure, which uses internal purification components, exhaust component one, and exhaust component two to degrade and purify the flue gas.

[0022] Step 4: After the solid reactants are sterilized, the variable-direction gas guiding mechanism is activated to switch the operating state and blow air into the interior, raising the drying structure into the separate gas guiding structure. The gas enters the separate gas guiding structure and dries and condenses the reactants to obtain the salicylic acid preparation.

[0023] This invention provides an apparatus and method for preparing high-content salicylic acid. Compared with the prior art, it has the following advantages:

[0024] The flue gas purification structure filters and purifies the waste entering the device. This not only completes the preparation process but also recycles and purifies the flue gas generated during preparation, effectively reducing the amount of waste gas emitted and ensuring the preparation process while reducing pollutants.

[0025] The device achieves excellent air-direction performance through a variable-direction air-guiding mechanism. This not only allows external air to be introduced into the device for rapid drying of the reactants, but also changes the direction of air intake and exhaust, enabling the device to self-circulate. During the reaction process, the device can extract the flue gas generated by the reactants and guide it into the purification system for purification, preventing the produced flue gas from being discharged to the outside.

[0026] The transmission mechanism, separate gas guiding structure, and air drying structure enable the device to perform integrated reaction preparation. This allows the device to prepare salicylic acid without extraction or conversion, avoiding multiple processing steps, saving materials and energy, and reducing actual preparation costs. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A schematic diagram of the overall internal structure of the preparation apparatus of the present invention is shown;

[0029] Figure 2 A schematic diagram of the overall appearance and structure of the preparation apparatus of the present invention is shown;

[0030] Figure 3 A schematic diagram of the internal structure of the reaction cylinder of the present invention is shown;

[0031] Figure 4 A schematic diagram of the internal components of the transmission mechanism of the present invention in an assembled state is shown.

[0032] Figure 5 This diagram shows the assembly state of the transmission mechanism and the separate air guide structure of the present invention.

[0033] Figure 6 A schematic diagram of the air-drying structure of the present invention is shown;

[0034] Figure 7 A schematic diagram of the composition structure of the variable-direction air guiding mechanism of the present invention is shown;

[0035] Figure 8 This diagram shows the internal components of the flue gas purification structure of the present invention in an assembled state.

[0036] Figure 9 A schematic diagram of the purification component structure of the present invention is shown;

[0037] The diagram shows: 1. Installation cavity; 2. Separate air guiding structure; 21. Separation cavity; 22. Insertion interface; 23. Filter screen; 3. Transmission mechanism; 31. Hollow guide rod; 32. Lifting structure; 321. Electric push rod; 322. Lifting rod; 323. Connector; 324. Connecting rod; 325. Lifting base; 33. Electric heating block; 34. Stirring blade; 35. Temperature sensor; 36. Motor; 4. Washing structure; 41. Water guiding cavity; 42. Nozzle; 43. Water inlet; 5. Reaction cylinder; 51. Injection port; 6. Flue gas purification structure; 61. Box body; 6 2. Purification components; 621. Inner chamber; 622. Thermal catalytic layer; 623. Air guide channel one; 624. Activated carbon adsorption layer; 625. Air guide channel two; 626. Partition; 63. Exhaust component one; 631. Air supply pipe one; 64. Exhaust component two; 641. Air supply pipe two; 7. Variable direction air guide mechanism; 71. Fan; 72. External air outlet; 73. Extraction pipe; 74. T-connector one; 75. T-connector two; 76. Air guide pipe; 77. Air exchange pipe; 78. Solenoid valve; 8. Air drying structure; 81. Air guide chamber; 82. Air guide head; 83. Air guide nozzle. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Example 1

[0040] To address the technical problems in the background section, the following apparatus and method for preparing high-content salicylic acid are provided:

[0041] Combination Figures 1-9 As shown, the present invention provides a high-content salicylic acid preparation device, including an installation cavity 1, a reaction cylinder 5 fixedly installed on the top of the installation cavity 1, and a connecting injection port 51 installed on one side of the reaction cylinder 5, a washing structure 4 fixedly installed in the upper part of the reaction cylinder 5, a separate gas guiding structure 2 fixedly installed in the lower part of the reaction cylinder 5, a transmission mechanism 3 extending into the interior fixedly installed on the top of the reaction cylinder 5, and penetrating the washing structure 4 and the separate gas guiding structure 2, a drying structure 8 suspended at the bottom of the transmission mechanism 3, a reversing gas guiding mechanism 7 and a flue gas purification structure 6 fixedly installed inside the installation cavity 1, and the reversing gas guiding mechanism 7 is assembled and connected with the flue gas purification structure 6 and the components inside the reaction cylinder 5;

[0042] The flue gas purification structure 6 includes a housing 61, a purification component 62, an exhaust component 1 63, and an exhaust component 2 64. The housing 61 is fixedly installed inside the mounting cavity 1. The purification component 62 is fixedly installed inside the housing 61. The exhaust component 2 64 and the exhaust component 1 63 are connected and installed in the housing 61 on one side of the purification component 62. The ports of the exhaust component 2 64 and the exhaust component 1 63 correspond.

[0043] The reactants to be prepared are injected through the injection port 51 to ensure that the materials can enter the reaction cylinder 5. The stirring component on the transmission mechanism 3 is used to stir and neutralize the materials, so that the materials can react quickly. During this process, the heating component on the transmission mechanism 3 can also be used to heat the materials inside to ensure control of the reaction process. The washing structure 4 can be used to wash the prepared products after the reaction to adjust the reactants to neutrality. The reactants in neutrality are yellow.

[0044] During the washing process, the reactants and washing liquid are separated by the separate air guiding structure 2, ensuring that the reactants are washed while the washing liquid is separated and discharged, so as to ensure that the subsequent drying operation can proceed normally. The variable air guiding mechanism 7 enables the device to achieve a good variable direction effect. Its effect is not only to introduce external air into the interior to achieve rapid air drying of the reactants, but also to change its own air intake and exhaust flow direction, so that the device can perform self-circulation. Its effect is that during the reaction of the device, the flue gas generated by the reactants can be extracted and introduced into the purification system for purification, preventing the production flue gas from being discharged to the outside.

[0045] Finally, the waste entering the device is purified and filtered by the flue gas purification structure 6. The effect is that the device not only completes the preparation operation, but also recycles and purifies the flue gas generated during the preparation, effectively reducing the amount of waste gas emitted, ensuring the preparation process while reducing pollutants.

[0046] The exhaust components 63 and 64 effectively work in conjunction with the washing liquid discharged during the washing process. The washing liquid sprays and degrades the discharged flue gas, effectively reducing particulate impurities. The purification component 62 allows the device to purify and filter the flue gas through both adsorption and catalysis.

[0047] Catalytic oxidation: This method uses special catalysts to catalytically oxidize harmful gases into relatively harmless carbon dioxide and water. Commonly used methods include low-temperature selective oxidation and high-temperature selective oxidation.

[0048] Adsorption method: This method uses adsorbents to adsorb harmful gases, which are then recovered, regenerated, or disposed of.

[0049] Example 2

[0050] like Figure 1 , Figure 3 , Figure 4 and Figure 5 As shown, based on the above embodiments, this embodiment further provides the following:

[0051] In this embodiment, the separate gas guiding structure 2 includes a separation chamber 21, an insertion interface 22, and a filter screen 23. The separation chamber 21 is fixedly installed inside the reaction cylinder 5, and several insertion interfaces 22 are evenly distributed at the bottom of the separation chamber 21. The filter screen 23 is fixedly installed at the port of the separation chamber 21. A negative pressure outlet is provided on the reaction cylinder 5 at the top of the separate gas guiding structure 2.

[0052] During the process, the filter screen 23 serves as a filter component, which aims to separate the reactants from the washing water. The reactants remain on the filter screen 23, while the water passes through the filter screen 23 into the separation chamber 21, and then flows into the bottom of the reaction cylinder 5 through the insertion port 22. Finally, it flows into the purification system through the drainage component at the bottom for recycling.

[0053] In this embodiment, the transmission mechanism 3 includes a hollow guide rod 31, a hoisting structure 32, an electric heating block 33, a stirring blade 34, a temperature sensor 35, and a motor 36. The hollow guide rod 31 is installed at the top of the reaction cylinder 5. Three sets of stirring blades 34 are fixedly installed at the bottom of the hollow guide rod 31. The electric heating block 33 is fitted on the hollow guide rod 31, and the temperature sensor 35 is fixedly installed on the hollow guide rod 31 below the electric heating block 33. The hoisting structure 32 is fixedly installed inside the hollow guide rod 31, and the hoisting structure 32 hoists the drying structure 8. The motor 36, which is rotatably connected to the hollow guide rod 31, is fixedly installed at the top of the reaction cylinder 5.

[0054] During operation, the motor 36 needs to be started first. The motor 36 drives the hollow guide rod 31 to rotate through the coupling. At that time, the stirring blades 34 on the hollow guide rod 31 stir the reactants to carry out the neutralization reaction. During this period, the internal stirring temperature is monitored in real time by the temperature sensor 35 so that the personnel can better control the internal temperature. In addition, the internal reactants can be heated in real time by the electric heating block 33 during the preparation.

[0055] Example 3

[0056] like Figures 1-9 As shown, based on the above embodiments, this embodiment further provides the following:

[0057] In this embodiment, the hoisting structure 32 includes an electric push rod 321, a lifting rod 322, a connector 323, a connecting rod 324, and a hanging seat 325. The electric push rod 321 is fixedly installed inside the hollow guide rod 31. The bottom of the electric push rod 321 is connected to the lifting rod 322 through the connector 323. The bottom of the lifting rod 322 is connected to the connecting rod 324, which extends out of the hollow guide rod 31, and the connecting rod 324 penetrates the air-drying structure 8. The bottom of the connecting rod 324 is connected to the hanging seat 325.

[0058] When the device needs to be air-dried, the separate air-guiding structure 2 can be lifted as a whole through the components. The electric push rod 321 acts on the docking rod 324 through the hanging rod 322, causing the docking rod 324 to extend and retract within the hollow guide rod 31. The lifting seat 325 is lifted by the upward movement, causing the hanging seat 325 to lift the air-guiding chamber 81. At that time, the air-guiding component on the air-guiding chamber 81 enters the insertion interface 22, completing the state switch of the device and ensuring subsequent air-guiding and air-drying.

[0059] In this embodiment, the washing structure 4 includes a water guiding cavity 41, a nozzle 42, and a water receiving head 43. The water guiding cavity 41 is fixedly installed at the top of the reaction cylinder 5, and a number of nozzles 42 are evenly distributed at the bottom of the water guiding cavity 41. The water receiving head 43 connected to the water guiding cavity 41 is installed on the outside of the reaction cylinder 5.

[0060] During operation, the water inlet 43 is connected to the external water supply pipe. At that time, the external water enters the water guide chamber 41 through the water inlet 43 and falls and sprays through the nozzle 42 on the water guide chamber 41 to achieve real-time rinsing of the reaction mixture.

[0061] In this embodiment, the purification component 62 includes an inner box 621, a thermal catalytic layer 622, a first air guide channel 623, an activated carbon adsorption layer 624, a second air guide channel 625, and a partition 626. The inner box 621 is fixedly installed inside the box 61. Three sets of thermal catalytic layers 622 are assembled inside the inner box 621. A partition 626 is fixedly installed inside the box 61 between the inner box 621 and the first exhaust component 63. A second air guide channel 625 that penetrates the partition 626 is connected to one side of the inner box 621, and a first air guide channel 623 that extends out of the inner box 621 is connected to the other side. Both the first air guide channel 623 and the second air guide channel 625 are filled with activated carbon adsorption layers 624.

[0062] The flue gas is drawn into the purification component 62 and degraded. Then it enters the inner box 621 through the second air guide channel 625. Before entering, it first undergoes adsorption filtration through the activated carbon adsorption layer 624 in the second air guide channel 625. After entering the inner box 621, it is heated and catalyzed through the thermal catalytic layer 622.

[0063] Since the main components of flue gas are sulfur dioxide and nitrogen oxides, thermocatalytic oxidation or selective catalytic reduction methods are commonly used to treat them. Thermocatalytic oxidation converts sulfur dioxide and nitrogen oxides into harmless substances such as oxygen, carbon dioxide, and water by heating a catalyst. Selective catalysis, on the other hand, removes these harmful substances by adding reducing agents such as ammonia in conjunction with a catalyst, reducing nitrogen oxides to nitrogen gas and water vapor at high temperatures.

[0064] In this embodiment, an air supply pipe 641 that is connected to an exhaust component 64 is fixedly installed on one side of the housing 61, an air supply pipe 631 that is connected to an exhaust component 63 is fixedly installed on the top of the housing 61, and a drain head that is connected to the exhaust component 64 is installed on one side of the housing 61. The drain head is located below the exhaust component 64.

[0065] The exhaust component 2 64 is connected to the reaction cylinder 5 through the air supply pipe 2 641. The purpose is to guide the gas generated during the drying process. At that time, the gas inside the reaction cylinder 5 enters the exhaust component 2 64 through the air supply pipe 2 641 and is transferred into the purification system to avoid the presence of harmful gases in the dried gas.

[0066] The gas supply pipe 631 absorbs the initially generated flue gas, enabling the device to perform bidirectional intake and circulation.

[0067] In this embodiment, the variable-direction air guiding mechanism 7 includes a fan 71, an external air port 72, an exhaust pipe 73, a first tee connector 74, a second tee connector 75, an air guiding pipe 76, an air exchange pipe 77, and a solenoid valve 78. The fan 71 is fixedly installed at the bottom of the mounting cavity 1. The output end of the fan 71 is connected to the second tee connector 75, and the input end is connected to the first tee connector 74. The ports of the second tee connector 75 are respectively connected to the air guiding pipe 76 and the air exchange pipe 77. The ports of the first tee connector 74 are respectively connected to the external air port 72 and the exhaust pipe 73. The external air port 72, the exhaust pipe 73, the air guiding pipe 76, and the air exchange pipe 77 are all equipped with solenoid valves 78. The exhaust pipe 73 is connected to the reaction cylinder 5, the air guiding pipe 76 is connected to the drying structure 8, and the air exchange pipe 77 is connected to the exhaust component 63.

[0068] During operation, the directional air guiding mechanism 7 operates in two states:

[0069] First, when the blower 71 is started, the solenoid valve 78 on the external air port 72 is closed, and the solenoid valve 78 on the exhaust pipe 73 is open. At that time, the exhaust pipe 73 is used to extract the air. Since the exhaust pipe 73 is connected to the reaction cylinder 5, the flue gas produced during the preparation will be quickly extracted. The extracted flue gas is introduced into the air exchange pipe 77 through the three-way connector 75. At this time, the solenoid valve 78 on the air guide pipe 76 is closed, and the flue gas enters the flue gas purification structure 6 for purification.

[0070] Secondly, when the blower 71 is started, the solenoid valve 78 on the external air port 72 is in the open state, and the solenoid valve 78 on the exhaust pipe 73 is in the closed state. At that time, the external gas is drawn in through the external air port 72 and then introduced into the gas guide pipe 76. At this time, the three-way connector 75 on the air exchange pipe 77 is in the closed state, and the gas enters the reaction cylinder 5 through the gas guide pipe 76, at which time the material is dried.

[0071] In this embodiment, the air-drying structure 8 includes an air-guiding chamber 81, an air-guiding head 82, and an air-guiding nozzle 83. The air-guiding chamber 81 is suspended between the connecting rod 324 and the hanging base 325. The bottom of the air-guiding chamber 81 is evenly distributed with communicating air-guiding heads 82, and the air-guiding head 82 is provided with communicating air-guiding nozzles 83. The air-guiding chamber 81 is connected to the air-guiding pipe 76.

[0072] During operation, external gas is drawn in and then introduced into the gas guide tube 76, and then enters the gas guide chamber 81 through the gas guide tube 76. The gas then enters the gas guide head 82 evenly through the gas guide chamber 81.

[0073] It should be noted that at this time, the gas guide head 82 has extended out of the insertion port 22, and the gas guide nozzle 83 has also entered the separation chamber 21. In this way, the gas enters the separation chamber 21 through the gas guide nozzle 83 and dries and condenses the reactants above the separation chamber 21.

[0074] Finally, the material is discharged under negative pressure through the negative pressure outlet. The negative pressure outlet is connected to the external negative pressure equipment pipeline. The negative pressure effect is used to extract the reactants. A check valve needs to be installed in the negative pressure outlet. Its principle is the same as that of the flue gas check valve. The purpose is to prevent the flue gas from being discharged separately through the negative pressure outlet and to ensure the internal sealing.

[0075] The working method of the high-content salicylic acid preparation device includes the following steps:

[0076] Step 1: Refined phenol and nitric acid are injected into the reaction cylinder 5 through the injection port 51. The transmission mechanism 3 is started to stir the preparation. The transmission mechanism 3 heats and stirs the internal materials through the electric heating block 33 and the stirring blade 34. At the same time, sodium oxide solution is added under controlled heating temperature to maintain the pH at 5-7.

[0077] Step 2: Under the continuous stirring of the transmission mechanism 3, sodium hydroxide solution is injected, and the variable-direction gas guiding mechanism 7 is activated to extract the flue gas generated by the reaction mixture and introduce it into the flue gas purification structure 6 for purification. After the flue gas appears, the reaction temperature needs to be maintained above 100 degrees Celsius and the reaction time needs to be maintained at 1-2 hours.

[0078] Step 3: The externally introduced water is used to wash the reactants through the washing structure 4. After the reactants are separated by the separation-type gas guiding structure 2, they are obtained as yellow solids. The flue gas is introduced into the flue gas purification structure 6. The flue gas purification structure 6 uses the internal purification components 62, exhaust component one 63, and exhaust component two 64 to degrade and purify the flue gas.

[0079] Step 4: After the solid reactants are sterilized with calcium oxide, the variable-direction gas guiding mechanism 7 is activated to switch the operating state and blow gas into the interior. It should be noted that before air drying, the temperature of the reactants must be kept below 13 degrees Celsius. The air drying structure 8 is raised into the separate gas guiding structure 2. The gas enters the separate gas guiding structure 2 and air dries and condenses the reactants to obtain the salicylic acid preparation.

[0080] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0081] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for preparing high-content salicylic acid, characterized in that: The system includes an installation cavity (1), a reaction cylinder (5) is fixedly installed on the top of the installation cavity (1), and a connecting injection port (51) is installed on one side of the reaction cylinder (5). A washing structure (4) is fixedly installed in the upper part of the reaction cylinder (5), a separate gas guiding structure (2) is fixedly installed in the lower part of the reaction cylinder (5), a transmission mechanism (3) extending into the interior is fixedly installed on the top of the reaction cylinder (5), and it penetrates the washing structure (4) and the separate gas guiding structure (2). A drying structure (8) is suspended at the bottom of the transmission mechanism (3). A reversible gas guiding mechanism (7) and a flue gas purification structure (6) are fixedly installed inside the installation cavity (1). The reversible gas guiding mechanism (7) is assembled and connected with the flue gas purification structure (6) and the components inside the reaction cylinder (5). The flue gas purification structure (6) includes a housing (61), a purification component (62), an exhaust component one (63), and an exhaust component two (64). The housing (61) is fixedly installed inside the mounting cavity (1). The purification component (62) is fixedly installed inside the housing (61). The exhaust component two (64) and the exhaust component one (63) are connected and installed in the housing (61) on one side of the purification component (62). The ports of the exhaust component two (64) and the exhaust component one (63) correspond to those of the exhaust component one (63). The separate gas guiding structure (2) includes a separation chamber (21), an insertion port (22), and a filter plate (23). The separation chamber (21) is fixedly installed inside the reaction cylinder (5), and several insertion ports (22) are evenly distributed at the bottom of the separation chamber (21). The filter plate (23) is fixedly installed at the port of the separation chamber (21). A negative pressure outlet is provided on the reaction cylinder (5) at the top of the separate gas guiding structure (2). The variable-direction air guiding mechanism (7) includes a fan (71), an external air port (72), an air extraction pipe (73), a three-way connector one (74), a three-way connector two (75), an air guiding pipe (76), an air exchange pipe (77), and a solenoid valve (78). The fan (71) is fixedly installed at the bottom of the mounting cavity (1). The output end of the fan (71) is connected to a three-way connector two (75), and the input end is connected to a three-way connector one (74). The end of the three-way connector two (75) is connected to the other end of the fan. The port is connected to the air guide pipe (76) and the air exchange pipe (77) respectively. The port of the three-way connector (74) is connected to the external air port (72) and the exhaust pipe (73) respectively. The external air port (72), the exhaust pipe (73), the air guide pipe (76) and the air exchange pipe (77) are all equipped with solenoid valves (78). The exhaust pipe (73) is connected to the reaction cylinder (5), the air guide pipe (76) is connected to the air drying structure (8), and the air exchange pipe (77) is connected to the exhaust component (63).

2. The apparatus for preparing high-content salicylic acid according to claim 1, characterized in that: The transmission mechanism (3) includes a hollow guide rod (31), a hoisting structure (32), an electric heating block (33), a stirring blade (34), a temperature sensor (35), and a motor (36). The hollow guide rod (31) is installed at the top of the reaction cylinder (5). Three sets of stirring blades (34) are fixedly installed at the bottom of the hollow guide rod (31). The electric heating block (33) is fitted on the hollow guide rod (31). The temperature sensor (35) is fixedly installed on the hollow guide rod (31) below the electric heating block (33). The hoisting structure (32) is fixedly installed inside the hollow guide rod (31). The hoisting structure (32) hoists the air-drying structure (8). The motor (36) is fixedly installed at the top of the reaction cylinder (5) and is rotatably connected to the hollow guide rod (31).

3. The apparatus for preparing high-content salicylic acid according to claim 2, characterized in that: The hoisting structure (32) includes an electric push rod (321), a lifting rod (322), a connector (323), a connecting rod (324), and a hanging seat (325). The electric push rod (321) is fixedly installed inside the hollow guide rod (31). The bottom of the electric push rod (321) is connected to the lifting rod (322) through the connector (323). The bottom of the lifting rod (322) is connected to the connecting rod (324) extending from the hollow guide rod (31), and the connecting rod (324) penetrates the air-drying structure (8). The bottom of the connecting rod (324) is connected to the hanging seat (325).

4. The apparatus for preparing high-content salicylic acid according to claim 3, characterized in that: The washing structure (4) includes a water guide cavity (41), a nozzle (42), and a water inlet (43). The water guide cavity (41) is fixedly installed at the top of the reaction cylinder (5), and a number of nozzles (42) are evenly distributed at the bottom of the water guide cavity (41). A water inlet (43) connected to the water guide cavity (41) is installed on the outside of the reaction cylinder (5).

5. The apparatus for preparing high-content salicylic acid according to claim 4, characterized in that: The purification component (62) includes an inner box (621), a thermal catalytic layer (622), an air guide channel one (623), an activated carbon adsorption layer (624), an air guide channel two (625), and a partition (626). The inner box (621) is fixedly installed inside the box body (61). Three sets of thermal catalytic layers (622) are installed inside the inner box (621). A partition (626) is fixedly installed inside the box body (61) between the inner box (621) and the exhaust component one (63). An air guide channel two (625) that penetrates the partition (626) is installed on one side of the inner box (621), and an air guide channel one (623) that extends out of the inner box (621) is installed on the other side. Both the air guide channel one (623) and the air guide channel two (625) are filled with activated carbon adsorption layers (624).

6. The apparatus for preparing high-content salicylic acid according to claim 5, characterized in that: One side of the box (61) is fixedly installed with an air supply pipe two (641) that is connected to the exhaust component two (64), and the top of the box (61) is fixedly installed with an air supply pipe one (631) that is connected to the exhaust component one (63). A drain head is connected to one side of the box (61) and is located below the exhaust component two (64).

7. The apparatus for preparing high-content salicylic acid according to claim 6, characterized in that: The air-drying structure (8) includes an air-guiding chamber (81), an air-guiding head (82), and an air-guiding nozzle (83). The air-guiding chamber (81) is suspended between the connecting rod (324) and the hanging base (325). The bottom of the air-guiding chamber (81) is evenly distributed with communicating air-guiding heads (82), and communicating air-guiding nozzles (83) are provided on the air-guiding heads (82). The air-guiding chamber (81) is connected to the air-guiding pipe (76).

8. The working method of the high-content salicylic acid preparation device according to claim 7, characterized in that: Includes the following steps: Step 1: Refined phenol and nitric acid are injected into the reaction cylinder (5) through the injection port (51). The mixture is stirred by starting the transmission mechanism (3). The transmission mechanism (3) heats and stirs the internal materials through the electric heating block (33) and the stirring blade (34), and controls the heating temperature during the preparation. Step 2: Under the continuous stirring of the transmission mechanism (3), sodium hydroxide solution is injected, and the variable direction gas guiding mechanism (7) is started to extract the flue gas generated by the reaction mixture and introduce it into the flue gas purification structure (6) for purification treatment. Step 3: The externally introduced water is used to wash the reactants through the washing structure (4). After the reactants are separated by the separation gas guiding structure (2), they are obtained as yellow solids. The flue gas is introduced into the flue gas purification structure (6). The flue gas purification structure (6) uses the internal purification components (62), exhaust component one (63), and exhaust component two (64) to degrade and purify the flue gas. Step 4: After the solid reactants are sterilized, the variable-direction gas guiding mechanism (7) is activated to switch the working state and then blow air into the interior. The air-drying structure (8) is raised into the separate gas guiding structure (2). The gas enters the separate gas guiding structure (2) and air-dries and condenses the reactants to obtain the salicylic acid preparation.

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