Method for preparing stannous octoate through pressurization

Abstract

The invention discloses a method for preparing stannous octoate through pressurization, and belongs to the technical field of stannous octoate preparation, and the method comprises the following steps: S1, using a transition metal complex as a solid acid-base catalyst, and optimizing the electron and stereo structure of the solid acid-base catalyst through ligand engineering; s2, synthesizing by adopting a continuous flow type microwave reactor; s3, introducing ultrasonic energy as an auxiliary means; s4, establishing a non-intrusive real-time monitoring platform based on an infrared spectrum and a Raman spectrum, and predicting a reaction process in combination with a machine learning algorithm; s5, establishing a solvent and catalyst recycling process; s6, selecting an ionic liquid, such as 1-butyl-3-methylimidazolium hexafluorophosphate, as a reaction medium; and S7, modifying stannous octoate molecules by introducing required functional groups or constructing a heterocyclic structure. The reaction rate and selectivity between the octanoic acid and the tin source are remarkably improved, the requirements of high temperature and high pressure on equipment are reduced, and the energy consumption is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of stannous octoate preparation, in particular to a method for preparing stannous octoate under pressure. Background Art

[0002] Stannous octoate is a basic catalyst used in the production of polyurethane foam, room temperature curing silicone rubber, polyurethane rubber, and polyurethane coatings. It is also used as a catalyst-type curing agent for epoxy resins. During curing, stannous octoate has greater catalytic activity than dibutyltin dilaurate. If the two are used in combination, the effect is better than using them alone, and both reaction speed and curing speed can be taken into account.

[0003] As the global requirements for environmental protection and efficient production continue to increase, the traditional preparation method of stannous octoate has gradually exposed many shortcomings, and a more advanced and environmentally friendly technical solution is urgently needed to meet market demand. Traditional catalysts such as stannous chloride (SnCl2) can only achieve better catalytic effects under high temperature and high pressure conditions. Such catalysts usually have a lower active site density, resulting in a slower reaction rate, low catalyst selectivity, and easy production of by-products, which affects the purity of the final product. For example, in the synthesis process of stannous octoate, other organotin compounds or incompletely reacted intermediates may be generated. Due to the low reaction rate, the entire production cycle is long and cannot meet the needs of large-scale industrial production. Summary of the invention

[0004] The object of the present invention is to provide a method for preparing stannous octoate under pressure to solve the problems raised in the background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a method for preparing stannous octoate under pressure, comprising the following steps:

[0006] S1: Use transition metal complexes as solid acid-base catalysts, and optimize their electronic and stereostructures through ligand engineering. The reaction temperature does not exceed 150°C and the pressure does not exceed 10MPa.

[0007] S2: Synthesis was performed using a continuous flow microwave reactor, with microwave power ranging from 300 W to 800 W and reaction time ranging from 5 min to 30 min, achieving uniform energy transfer;

[0008] S3: Ultrasonic energy is introduced as an auxiliary means to accelerate the collision frequency and reaction rate between molecules by using its cavitation effect. The ultrasonic power is set between 20kHz and 50kHz, and the amplitude range is 0.5 to 2.0μm;

[0009] S4: Establish a non-invasive real-time monitoring platform based on infrared and Raman spectroscopy, combine machine learning algorithms to predict the reaction progress, and automatically adjust the temperature range to 80°C to 120°C and the pressure range to 1MPa to 5MPa;

[0010] S5: Establishing solvent and catalyst recovery and reuse processes, including but not limited to membrane separation technology and adsorption method, to extract unreacted raw materials and by-products from waste liquid;

[0011] S6: Selecting an ionic liquid such as 1-butyl-3-methylimidazolium hexafluorophosphate as the reaction medium, and the ionic liquid itself can also be regenerated by physical or chemical methods;

[0012] S7: The stannous octoate molecule can be modified by introducing the desired functional groups or constructing heterocyclic structures to give the new material special physical and chemical properties.

[0013] In this embodiment, the catalyst in S1 includes at least one transition metal center combined with an organic ligand to form a complex with a clear spatial configuration.

[0014] Preferably, the microwave-assisted synthesis is carried out in a continuous flow reactor, which allows energy transfer and product formation rate. The reaction mixture flows through a preheating zone into a microwave chamber, where it is subjected to microwave radiation within a set power range, and then immediately cooled and the product is collected.

[0015] In this solution, the online monitoring and feedback adjustment in the method also include mass spectrometer (MS) and nuclear magnetic resonance (NMR) detection means. A variety of data analysis algorithms are integrated to accurately identify changes in reaction states and issue instructions to adjust relevant parameters accordingly.

[0016] Preferably, the recycling in the method includes recovering unreacted raw materials and by-products by ultrafiltration membrane separation or activated carbon adsorption, and re-introducing them into the next reaction cycle. For components that are difficult to recover directly, they are converted into useful intermediate products by chemical conversion.

[0017] This solution is preferred, wherein the specific parameters of the ultrasound-assisted synthesis technology are ultrasound power P and amplitude A, and the relationship between them is expressed by the formula E=kPA 2 Indicates, where E is the energy input density (unit: W / cm 2 ), k is the proportionality coefficient (unit: cm 2 / W), the ultrasonic power P ranges from 20kHz to 50kHz, and the amplitude A ranges from 0.5 to 2.0μm.

[0018] This scheme is preferred, wherein the structural modification involves adding functional groups to the stannous octoate molecular chain, which is completed through a chemical synthesis route, and the resulting new material should show expected changes in physical and chemical properties.

[0019] Preferably, the method further comprises a post-treatment step, wherein the target product stannous octoate is separated from the reaction mixture by supercritical fluid extraction technology, and carbon dioxide is used as a supercritical fluid, and its solubility is changed by adjusting the temperature T and pressure P conditions to separate the target compound from other impurities;

[0020] The extraction conditions are determined by the formula D(T,P)=αe -β / T +γP description, where D is the solubility (unit: g / L), α, β, γ are constants, the temperature T ranges from 31°C to 40°C, the pressure P ranges from 7.38MPa to 10MPa, and the solubility D decreases with increasing temperature and increases with increasing pressure.

[0021] Preferably, the method further comprises surface modification of the obtained stannous octoate to improve its long-term storage stability and antioxidant capacity, and the surface modification is achieved through chemical deposition, sol-gel method and other methods.

[0022] Preferably, the present solution also has a special device for preparing the above-mentioned improved stannous octoate, which integrates a microwave radiation device, an online monitoring instrument and an automatic control system.

[0023] Compared with the prior art, the technical effects and advantages of the present invention are as follows:

[0024] The method for preparing stannous octoate under pressure uses a transition metal complex as a solid acid-base catalyst (such as palladium, platinum or rhodium) and optimizes its electronic and stereostructure, so that the reaction rate and selectivity between octanoic acid and a tin source can be significantly improved under mild conditions (temperature not exceeding 150°C and pressure not exceeding 10MPa). This improvement reduces the requirements for high temperature and high pressure equipment and reduces energy consumption. The catalyst has high stability and recyclability, ensuring the economic benefits of long-term use. Experiments show that after multiple cycles of use, the catalyst can still maintain efficient catalytic performance, thereby reducing the frequency and cost of catalyst replacement.

[0025] The synthesis is carried out using a continuous flow microwave reactor, with precise control of microwave power (300W to 800W) and reaction time (5 minutes to 30 minutes), achieving uniform energy transfer and avoiding local overheating in traditional heating methods. This not only improves product yield and purity, but also shortens reaction time and improves production efficiency. The entire process is highly automated and easy to scale up. The automatic control system can monitor and adjust reaction conditions in real time to ensure consistent product quality.

[0026] The experiment found that when using transition metal complexes as catalysts and combined with ultrasound assistance, the synthesis rate and selectivity of stannous octoate were significantly higher than using any method alone. This synergistic effect not only improves the reaction efficiency, but also reduces the formation of by-products and improves the purity of the final product. The ultrasonic cavitation effect may enhance the exposure of active sites on the catalyst surface, allowing more reactant molecules to contact the catalyst surface, thereby accelerating the reaction process.

[0027] By selecting low-volatility ionic liquids as reaction media and combining them with a complete solvent recovery and reuse process, the generation of organic waste liquid is greatly reduced. This combination not only reduces the environmental burden, but also significantly cuts down on treatment costs. Experiments show that after multiple cycles, ionic liquids can still maintain good solubility and mass transfer effects, further demonstrating their economic and environmental benefits.

[0028] Microwave-assisted synthesis achieves uniform energy transfer, while the online monitoring system ensures precise control of reaction conditions. The combination of the two can achieve a more efficient reaction process and optimize reaction conditions through real-time data feedback. The online monitoring system can quickly capture changes in the reaction state and adjust parameters such as microwave power in a timely manner to ensure that the reaction is always in the best state.

[0029] Supercritical fluid extraction technology not only improves the extraction efficiency of the target product, but also affects the effect of molecular structure modification to a certain extent. For example, supercritical carbon dioxide may take away some impurities during the extraction process, indirectly promoting the success rate of subsequent modification steps. The small amount of supercritical fluid remaining during the extraction process may change the reaction environment, thereby optimizing the conditions for molecular structure modification and improving the modification effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 A flow chart of the steps of a method for preparing stannous octoate under pressure according to the present invention;

[0032] Figure 2 The present invention is a general flow chart of a method for preparing stannous octoate under pressure. DETAILED DESCRIPTION

[0033] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present invention. However, it is apparent to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features well known in the art are not described.

[0034] Unless otherwise defined, the up, down, left, right, front, back, inside and outside directions involved in this document are based on the up, down, left, right, front, back, inside and outside directions in the figures shown in the present invention, and are explained here together.

[0035] This embodiment provides Figure 1 and Figure 2 A method for preparing stannous octoate under pressure is shown, characterized in that it comprises the following steps:

[0036] S1: using a transition metal complex as a solid acid-base catalyst, the catalyst contains a noble metal element selected from palladium (Pd), platinum (Pt) or rhodium (Rh), and its electronic and stereostructure are optimized through ligand engineering, and the reaction temperature does not exceed 150°C and the pressure does not exceed 10MPa. The reaction rate and selectivity between octanoic acid and a tin source can be significantly improved. The catalyst has high activity, stability and recyclability, ensuring the economic benefits of long-term use; synthesizing a transition metal complex containing a noble metal element of palladium (Pd), platinum (Pt) or rhodium (Rh), for example, synthesizing a palladium-pyridine complex (Pd(pyridine)2Cl2), using X-ray diffraction (XRD), transmission electron microscopy (TEM) and other means to characterize the physical and chemical properties of the catalyst, experimentally determining the optimal catalyst concentration range (for example, 0.1wt% to 5wt%), and testing its reusability by cyclic voltammetry;

[0037] S2: A continuous flow microwave reactor is used for synthesis, the microwave power range is controlled to be 300W to 800W, the reaction time is 5 minutes to 30 minutes, uniform energy transfer is achieved, local overheating in traditional heating methods is effectively avoided, and the product yield and purity are improved. This method is particularly suitable for the rapid and efficient preparation of high-quality stannous octoate; a continuous flow microwave reactor is used, including a preheating zone, a microwave chamber and a cooling system, a temperature sensor and a pressure sensor are set in the microwave chamber to ensure real-time monitoring of the reaction conditions, and automatic control is used to adjust parameters such as microwave power, temperature and flow rate to ensure the consistency and stability of the reaction conditions;

[0038] S3: Introduce ultrasonic energy as an auxiliary means, and use its cavitation effect to accelerate the collision frequency and reaction rate between molecules. The ultrasonic power is set between 20kHz and 50kHz, and the amplitude range is 0.5 to 2.0μm, so as to achieve efficient chemical conversion at a lower temperature and reduce the generation of by-products. Select the required ultrasonic equipment, such as Branson ultrasonic cleaning machine, and set the power and amplitude parameters. Place the reaction mixture in an ultrasonic bath, optimize the ultrasonic treatment time and temperature conditions through experiments, and use octanoic acid and tin dichloride as examples to verify the effect of ultrasound on the reaction rate and selectivity.

[0039] S4: Establish a non-invasive real-time monitoring platform based on infrared spectroscopy (FTIR) and Raman spectroscopy, combine machine learning algorithms to predict the reaction process, and automatically adjust the temperature range to 80℃ to 120℃ and the pressure range to 1MPa to 5MPa to ensure the consistency and stability of each batch of products. The system is also equipped with an emergency shutdown mechanism to deal with abnormal situations, which enhances the safety of operation; install FTIR and Raman spectrometers, integrate data analysis software, set up an emergency shutdown mechanism, and train the machine learning model through experimental data to enable it to accurately identify changes in reaction states and automatically adjust parameters. Taking the preparation of stannous octoate as an example, verify the real-time monitoring and feedback adjustment functions of the system;

[0040] S5: By establishing a solvent and catalyst recovery and reuse process, including but not limited to membrane separation technology and adsorption method, unreacted raw materials and by-products are extracted from the waste liquid. These substances are purified and then re-entered into the next reaction cycle, which reduces the waste of raw materials and reduces production costs, in line with the green chemistry principles under the C08K classification; by implementing membrane separation devices and adsorption columns, selecting the required membrane materials (such as polyethersulfone membranes) and adsorbents (such as activated carbon), optimizing the regeneration process, ensuring the quality and purity of the recycled materials, and taking ionic liquids [BMIM][PF6] as an example, verifying their recovery and reuse efficiency;

[0041] S6: Select ionic liquids such as 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF6]) as the reaction medium. This solvent has low volatility, high conductivity and good solubility, which is conducive to the full contact between the reactants and reduces the impact on the environment. In addition, the ionic liquid itself can be regenerated by physical or chemical methods, which further reflects the concept of environmental protection; select the required type of ionic liquid, verify its compatibility with the reactants and mass transfer effect through experiments, optimize its regeneration and reuse process, ensure the economy and environmental protection of long-term use, and take [BMIM][PF6] as an example to verify its application effect in the synthesis of stannous octoate;

[0042] S7: Modify the stannous octoate molecule by introducing the desired functional groups (such as hydroxyl, amino, carboxyl) or constructing heterocyclic structures (such as pyridine ring, thiophene ring) to give the new material special physicochemical properties, such as better solubility, higher thermal stability and mechanical properties. Implement chemical synthesis routes, such as esterification, amidation and other reactions, introduce target functional groups, verify the modification effect through physicochemical characterization (such as FTIR, NMR), and test the physicochemical properties of the new material. Using stannous octoate as a substrate, introduce hydroxyl groups through esterification reaction, and verify the solubility and thermal stability of the modified material.

[0043] In the present embodiment, the catalyst in S1 includes at least one transition metal center (such as palladium, platinum, rhodium) combined with an organic ligand to form a complex with a clear spatial configuration. The catalyst exhibits excellent catalytic activity during the synthesis process, and can significantly promote the reaction even at a concentration of 0.1wt% to 5wt%, while maintaining high selectivity and a long service life, which is convenient for subsequent recycling. Synthesize and characterize a variety of ligand-modified transition metal complexes, such as Pd (pyridine) 2Cl2, screen the optimal formula through experiments, test the catalytic activity, selectivity and life of the catalyst at different concentrations, verify its recyclability, such as by centrifugation and washing to recover the catalyst, and reuse it in the same reaction.

[0044] In the present embodiment, the microwave-assisted synthesis is implemented in a continuous flow reactor, allowing more efficient energy transfer and faster product formation speed. Specifically, the reaction mixture flows through the preheating zone into the microwave chamber, where it receives microwave radiation within a set power range, and then immediately cools and collects the product. The whole process has a high degree of automation and is easy to scale up. According to the specific reaction requirements, a microwave reactor is passed, including a preheating zone, a microwave chamber and a cooling system. The automated control system is used to monitor and adjust parameters such as microwave power, temperature and flow rate in real time. Octanoic acid and tin dichloride are used as examples to verify the effect of microwave-assisted synthesis. A variety of detection instruments such as FTIR, Raman spectrometer, and mass spectrometer are installed and integrated, and data analysis software is developed to train machine learning models through experimental data. Parameter thresholds and feedback mechanisms are set to ensure the reliability and response speed of the system.

[0045] In this embodiment, the online monitoring and feedback adjustment in the method are not limited to the above two spectral technologies, but also include mass spectrometer (MS) and nuclear magnetic resonance (NMR) detection methods. A variety of data analysis algorithms are integrated to accurately identify changes in reaction states and issue instructions to adjust relevant parameters accordingly. All hardware equipment meets industrial standards to ensure long-term stable operation, thereby achieving continuous output of high-quality products.

[0046] In this embodiment, the recycling in the method includes recovering unreacted raw materials and by-products through ultrafiltration membrane separation or activated carbon adsorption, and re-introducing them into the next reaction cycle. For components that are difficult to recover directly, they are converted into useful intermediate products by chemical conversion, thereby reducing waste emissions and improving the reuse efficiency and quality of fillers or modifiers.

[0047] In this embodiment, the specific parameters of the ultrasound-assisted synthesis technology are ultrasound power P and amplitude A, and the relationship between them can be expressed by the formula E=kPA 2 Indicates, where E is the energy input density (unit: W / cm 2 ), k is the proportionality coefficient (unit: cm 2 / W), the ultrasonic power P ranges from 20kHz to 50kHz, and the amplitude A ranges from 0.5 to 2.0μm. By precisely controlling the ultrasonic parameters, the reaction efficiency can be significantly improved under mild conditions and the generation of by-products can be reduced. The energy input density E directly affects the reaction rate and selectivity, so optimizing P and A is crucial to obtaining the best reaction conditions.

[0048] In this embodiment, the structural modification involves adding functional groups, such as hydroxyl and amino active groups, to the stannous octoate molecular chain to enhance its interaction with other materials and broaden its application range, which is completed through a chemical synthesis route, such as introducing the target functional group through esterification, amidation and other reactions. The resulting new material should show the expected changes in physical and chemical properties and show excellent performance in practical applications.

[0049] In this embodiment, the method also includes a post-processing step, using supercritical fluid extraction technology to separate the target product stannous octoate from the reaction mixture, using carbon dioxide as a supercritical fluid, and adjusting the temperature T and pressure P conditions to change its solubility to separate the target compound from other impurities. Compared with traditional solvent extraction, this method not only improves the extraction efficiency, but also greatly reduces the use of organic solvents, which is in line with the concept of environmental protection. The extraction conditions are expressed by the formula D(T,P)=αe -β / T +γP description, where D is the solubility (unit: g / L), α, β, γ are constants, the temperature T ranges from 31°C to 40°C, and the pressure P ranges from 7.38MPa to 10MPa. The solubility D decreases with increasing temperature and increases with increasing pressure, which is very important for selecting the optimal extraction conditions.

[0050] In this embodiment, the method also includes surface modification of the obtained stannous octoate, such as coating with a silicon dioxide protective layer or doping with trace rare earth elements (such as cerium, lanthanum, etc.), to improve its long-term storage stability and antioxidant capacity. The surface modification is achieved through chemical deposition, sol-gel method and multiple other methods. The modified material finally obtained must undergo strict quality testing to ensure that its performance meets the expected standards.

[0051] In the present embodiment, there is also a special device for preparing the above-mentioned improved stannous octoate, which integrates a microwave radiation device, an online monitoring instrument and an automatic control system, and realizes the integration and intelligent operation of the whole production process. The design of the equipment takes full account of user-friendly interface and maintenance convenience, supports remote monitoring and fault diagnosis functions, and meets the high standards of modern chemical production. In addition, the equipment also reserves an expansion interface so that new process modules can be upgraded or added in the future, ensuring the foresight and adaptability of the technology.

[0052] It should be noted that, in this article, relational terms such as one and two are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0053] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing stannous octoate under pressure, characterized in that: The following steps are involved: S1: Use transition metal complexes as solid acid-base catalysts, and optimize their electronic and stereostructures through ligand engineering. The reaction temperature does not exceed 150°C and the pressure does not exceed 10MPa. S2: Synthesis was performed using a continuous flow microwave reactor, with microwave power ranging from 300 W to 800 W and reaction time ranging from 5 min to 30 min, achieving uniform energy transfer; S3: Ultrasonic energy is introduced as an auxiliary means to accelerate the collision frequency and reaction rate between molecules by using its cavitation effect. The ultrasonic power is set between 20kHz and 50kHz, and the amplitude range is 0.5 to 2.0μm; S4: Establish a non-invasive real-time monitoring platform based on infrared and Raman spectroscopy, combine machine learning algorithms to predict the reaction progress, and automatically adjust the temperature range to 80°C to 120°C and the pressure range to 1MPa to 5MPa; S5: Establishing solvent and catalyst recovery and reuse processes, including but not limited to membrane separation technology and adsorption method, to extract unreacted raw materials and by-products from waste liquid; S6: using an ionic liquid such as 1-butyl-3-methylimidazolium hexafluorophosphate as the reaction medium, and the ionic liquid itself can also be regenerated by physical or chemical methods; S7: The stannous octoate molecules can be modified by introducing the desired functional groups or constructing heterocyclic structures to give the new materials special physical and chemical properties.

2. A method for preparing stannous octoate under pressure according to claim 1, characterized in that: The catalyst in S1 comprises at least one transition metal center combined with an organic ligand to form a complex with a well-defined spatial configuration.

3. A method for preparing stannous octoate under pressure according to claim 2, characterized in that: The microwave-assisted synthesis is carried out in a continuous flow reactor, which allows for energy transfer and product formation speed. The reaction mixture flows through a preheating zone into a microwave chamber, where it is subjected to microwave radiation within a set power range, followed by immediate cooling and product collection.

4. A method for preparing stannous octoate under pressure according to claim 3, characterized in that: The online monitoring and feedback adjustment in the method also include mass spectrometer (MS) and nuclear magnetic resonance (NMR) detection means. A variety of data analysis algorithms are integrated to accurately identify changes in reaction states and issue instructions to adjust relevant parameters accordingly.

5. A method for preparing stannous octoate under pressure according to claim 4, characterized in that: The recycling in the method includes recovering unreacted raw materials and by-products through ultrafiltration membrane separation or activated carbon adsorption, and re-introducing them into the next reaction cycle. For components that are difficult to recover directly, they are converted into useful intermediate products by chemical conversion.

6. A method for preparing stannous octoate under pressure according to claim 5, characterized in that: The specific parameters of the ultrasound-assisted synthesis technology are the ultrasound power P and the amplitude A, and the relationship between them is expressed by the formula E=kPA 2 Indicates, where E is the energy input density (unit: W / cm 2 ), k is the proportionality coefficient (unit: cm 2 / W), the ultrasonic power P ranges from 20kHz to 50kHz, and the amplitude A ranges from 0.5 to 2.0μm.

7. A method for preparing stannous octoate under pressure according to claim 6, characterized in that: The structural modification involves adding functional groups to the stannous octoate molecular chain, which is completed through a chemical synthesis route. The resulting new material should exhibit expected changes in physical and chemical properties.

8. A method for preparing stannous octoate under pressure according to claim 7, characterized in that: The method also includes a post-processing step, using supercritical fluid extraction technology to separate the target product stannous octoate from the reaction mixture, using carbon dioxide as a supercritical fluid, and adjusting the temperature T and pressure P conditions to change its solubility to separate the target compound from other impurities; The extraction conditions are determined by the formula D(T,P)=αe -β / T +γP description, where D is the solubility (unit: g / L), α, β, γ are constants, the temperature T ranges from 31°C to 40°C, the pressure P ranges from 7.38MPa to 10MPa, and the solubility D decreases with increasing temperature and increases with increasing pressure.

9. A method for preparing stannous octoate under pressure according to claim 8, characterized in that: The method further comprises performing surface modification treatment on the obtained stannous octoate to improve its long-term storage stability and anti-oxidation ability, and the surface modification is achieved through chemical deposition, sol-gel method and multiple approaches.

10. A method for preparing stannous octoate under pressure according to any one of claims 1 to 9, characterized in that: The invention also provides a special device for preparing the improved stannous octoate, which integrates a microwave radiation device, an online monitoring instrument and an automatic control system.

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