Molybdenum isocaprylate catalyst as well as preparation method and application thereof

Abstract

The invention relates to a molybdenum isocaprylate catalyst and a preparation method thereof, and belongs to the technical field of metal organic compounds. The method for preparing the molybdenum isocaprylate catalyst comprises the following steps: firstly, mixing a molybdenum source, isocaprylic acid, acetic acid and a reducing agent according to a molar ratio of 1: (2.5-4.5): (1.5-2.5): (1.5-2.5), and carrying out mixed heating reaction at 80-100 DEG C for 1-3 hours; then carrying out reduced pressure distillation, heating to 120-140 DEG C, adding 0.8-1.5 times of a reducing agent and 0.01-0.1% of a pour point depressant, and continuously reacting for 1-3 hours; and carrying out reduced pressure distillation, heating to 180-200 DEG C, and keeping for 1-3 hours to obtain the molybdenum isocaprylate catalyst which is good in flowability and not easy to solidify. According to the invention, oxalic acid or hydrazine hydrate is used as a reducing agent, and polymethacrylate or octadecyl polyacrylate is introduced as a pour point depressant, so that the molybdenum content of the catalyst is effectively increased to 16%, the defect of easy solidification in a traditional preparation method is avoided, and the fluidity and industrial applicability of the catalyst are significantly improved. The method is simple in process, economical, environmentally friendly and suitable for industrial large-scale production.

Description

Technical Field

[0001] The invention relates to the technical field of preparation of molybdenum isooctanoate catalysts, and in particular to a molybdenum isooctanoate catalyst and a preparation method and application thereof. Background Art

[0002] Molybdenum 2-ethylhexanoate is an important metal organic compound, which is widely used in lubricant manufacturing, oil processing, coatings and paints. Especially in the oil processing industry, molybdenum 2-ethylhexanoate plays an important role as a hydrocracking catalyst. Its high catalytic performance can significantly improve the hydrocracking efficiency of heavy and inferior oils, deeply converting them into light hydrocarbons, thereby improving the utilization rate of crude oil. In addition, molybdenum 2-ethylhexanoate can also be used as an oil refining additive to promote component separation and conversion to improve oil quality.

[0003] However, the current preparation technology of molybdenum isooctanoate has the following major problems and defects: Process complexity: Existing technologies often involve multi-step reactions, which require the control of high temperatures and complex conditions, resulting in lengthy process flows and cumbersome operations.

[0004] Unstable product quality: Improper selection of reducing agents or catalysts in some processes leads to impurities or unstable performance in the product. For example, Chinese patent application number CN202010832785 discloses a technology of mixing a molybdenum source, isooctanoic acid and acetic anhydride, in which acetic anhydride is used as a reducing agent in the reaction to promote the reaction. However, the product contains a large amount of acetic acid, and the product is easy to solidify after being evaporated, especially in continuous production, and it is easy to coke in the reactor, resulting in reduced yield and damage to the reactor.

[0005] Low molybdenum content: The molybdenum content of isooctanoic acid molybdenum prepared by some processes cannot meet the requirements of efficient catalysis. For example, in the Chinese patent application with application number CN202410171033, a method of using reducing gas to react with a molybdenum source first, and then heating and mixing with isooctanoic acid to obtain isooctanoic acid molybdenum, although the system components are simple and it is not easy to form precipitation, the reaction temperature is high and the molybdenum content of the prepared product is low, which is difficult to meet industrial applications.

[0006] The product is easy to solidify: Due to the chemical properties of molybdenum 2-ethylhexanoate, some processes fail to effectively control the fluidity of the product, and solidification is easy to occur, affecting storage and use. For example, the Chinese patent application with application number CN202211235277 proposes a method of reacting molybdic acid with excess 2-ethylhexanoic acid. Although the reaction temperature is reduced under the catalysis of organic amines, the obtained product contains a large amount of organic amines and is still easy to solidify, making it difficult to achieve long-term storage and industrial promotion.

[0007] Based on the above problems, the existing technology still has obvious bottlenecks in the preparation of molybdenum isooctanoate catalysts, which are mainly reflected in complex processes, high costs, easy solidification of products, and insufficient molybdenum content. Therefore, a new preparation method is urgently needed to solve these problems and prepare molybdenum isooctanoate catalysts with high molybdenum content, high fluidity, and not easy to solidify, so as to meet the needs of industrial production and achieve higher economic benefits and technical value. Summary of the invention

[0008] The technical problem to be solved by the present invention is to provide a method for preparing a molybdenum isooctanoate catalyst, so as to solve the problems of complex process, high cost, easy solidification of the product and insufficient molybdenum content in the product in the conventional preparation method in the prior art.

[0009] To overcome the above defects of the prior art, the present invention provides a method for preparing a molybdenum isooctanoate catalyst, comprising the following steps: S1: Mixing and heating reaction: mixing a molybdenum source, isooctanoic acid, acetic acid and a reducing agent in a molar ratio of 1: (2.5-4.5): (1.5-2.5): (1.5-2.5) and reacting to partially reduce the molybdenum source to obtain a reaction mixture; S2: vacuum distillation and temperature reaction: the reaction mixture obtained in step S1 is subjected to vacuum distillation, then the temperature is raised to 120-140° C., and the reducing agent and pour point depressant are added again, and the reaction is continued for 1-3 hours; S3: Final heating reaction: The reaction mixture obtained in step S2 is again subjected to reduced pressure distillation and then heated to 180-200° C., and then the heating is stopped and the reaction is kept warm to obtain a molybdenum isooctanoate catalyst.

[0010] Compared with the prior art, the preparation method of a molybdenum isooctanoate catalyst in the present application has the following purposes and technical effects of each step: in the above-mentioned step S1, by mixing the raw materials in a specific molar ratio in the method of the present invention, the reaction rate of the molybdenum source and isooctanoic acid is optimized, the molybdenum source is partially reduced, the activity and efficiency of the reaction system are improved, and the occurrence of side reactions is avoided; in step S2, unnecessary impurities are removed by reduced pressure distillation to improve the purity of the product, and by adding a pour point depressant, the fluidity of the final product is improved and the problem of easy solidification is solved; and in the final heating reaction of step S3, the high-temperature insulation stage ensures the efficient reduction of molybdenum, forms a stable organic molybdenum complex, and significantly improves the molybdenum content and uniformity in the catalyst.

[0011] Compared with the prior art, the preparation method of a molybdenum isooctanoate catalyst of the present application has at least the following technical advantages: Optimization and segmented use of reducing agent: The preparation method of the present application changes the reduction method of single use of acetic anhydride or triethylamine in the prior art to segmented use of reducing agent, thereby ensuring the controllability of the reduction process and avoiding the problem of by-product generation caused by excessive reducing agent, thereby improving the reduction efficiency and significantly improving the purity and activity of molybdenum; Introduction of pour point depressant: Adding pour point depressant (such as polymethacrylate or polyoctadecyl acrylate) effectively solves the problem of easy solidification of molybdenum 2-ethylhexanoate catalyst, significantly improves the fluidity and storage stability of the product, facilitates the transportation and use of the catalyst in industry, and improves the practicality of the product; Optimized process of multiple vacuum distillation: Through multiple vacuum distillation, the water and volatile impurities in the reaction are completely removed. Compared with the existing high-temperature and long-term treatment, the process is simpler, the energy consumption is lower, the product purity is improved, and the loss of reactor equipment is reduced; Significantly increased molybdenum content The preparation method of the present invention successfully realizes a high-molybdenum catalyst with a molybdenum content of 16% through a reaction system with a specific molar ratio and a staged reduction process, while the molybdenum content of the existing technology products is generally low, and can show better catalytic efficiency in the field of lubricating oil additives and petroleum catalysis; Furthermore, the preparation method of the present invention significantly reduces the process complexity by simplifying the selection of raw materials and optimizing the reaction steps. By introducing a pour point depressant, the solidification problem of traditional products in continuous production is avoided. By optimizing the temperature control and reduced pressure distillation process, energy consumption and production costs are reduced, and several technical problems existing in the prior art in the background technology are solved.

[0012] In a possible implementation, in step S1, the molybdenum source is molybdic acid or ammonium molybdate.

[0013] Compared with the prior art, the above technical scheme is adopted to select molybdic acid or ammonium molybdate as the molybdenum source. Both substances have good water solubility and high molybdenum content, and can react efficiently with isooctanoic acid and acetic acid under appropriate reaction conditions to form a highly active molybdenum complex. Compared with other molybdenum sources (such as molybdenum oxides or molybdenum compounds containing organic ligands), the reaction is more efficient and economical.

[0014] In a possible implementation, in step S1, the reducing agent is hydrazine hydrate or oxalic acid.

[0015] Compared with the prior art, the above technical solution can efficiently reduce the molybdenum (+6) in molybdic acid or ammonium molybdate to an active intermediate state by using hydrazine hydrate as a strong reducing agent, and does not produce difficult-to-handle byproducts. The strong reducing property of hydrazine hydrate ensures the rapid progress of the reduction reaction, shortens the process time, and improves the reaction efficiency; while oxalic acid is an organic reducing agent, which gently reduces the molybdenum in molybdic acid or ammonium molybdate through the oxidation of its carboxyl group, avoiding over-reduction or the generation of impurities. At the same time, the carbon dioxide and water generated by the decomposition of oxalic acid during the reaction will not pollute the system, which helps to maintain the purity of the product; through the synergistic effect of the further reducing agent and other components (including isooctanoic acid and acetic acid), the activation process of the molybdenum source is accelerated, and a stable reaction environment is created for the subsequent addition of a pour point depressant.

[0016] In a possible implementation, in step S1, the pour point depressant is polymethacrylate or polyoctadecyl acrylate.

[0017] Compared with the prior art, the above technical solution makes methacrylate have excellent anti-crystallization performance, which can effectively interfere with the excessive arrangement of molecules in the catalyst and reduce the freezing point of the system. Polymethacrylate embeds the catalyst molecules through its polymer chain segments, destroying the conditions for its solid-state formation, so that the catalyst maintains fluidity at a lower temperature; and polyoctadecyl acrylate: is a long-chain polymer ester with excellent hydrophobicity and anti-condensation properties, which can cover or modify the surface of catalyst particles during the reaction to prevent them from aggregating or crystallizing after cooling; the above pour point depressant can form a weak interaction (van der Waals force or interchain force) with molybdenum isooctanoate molecules, reduce the curing tendency of the catalyst by changing the viscoelasticity of the system, and does not affect the high molybdenum content and catalytic performance of molybdenum isooctanoate, taking into account both fluidity and catalytic activity.

[0018] In a possible implementation, in step S1, the reaction conditions after mixing are: reacting at 80-100° C. for 1-3 hours.

[0019] Compared with the prior art, by adopting the above technical scheme, the temperature range of 80-100°C is the optimal temperature for the chemical reaction between the molybdenum source (molybdic acid or ammonium molybdate) and isooctanoic acid, acetic acid and the reducing agent. At this temperature, the partial reduction rate of the molybdenum source and the rate of the complex reaction can maintain a dynamic balance, avoiding the generation of side reactions caused by too high a temperature or incomplete reactions caused by too low a temperature. The above implementation method further improves the purity and stability of the product by strictly controlling the temperature and time to avoid system instability or accumulation of by-products caused by improper conditions. While ensuring the high purity and high activity of the catalyst, it simplifies the process steps and reduces energy consumption.

[0020] In a possible implementation, in step S2, the molar ratio of the reducing agent to the reducing agent in step S1 is (0.8-1.5): (1.5-2.5), and the added mass of the pour point depressant is 0.01-0.1% of the reaction mixture.

[0021] Compared with the prior art, the above technical solution is adopted. In step S2, the molar ratio of the reducing agent to that in step S1 is set to (0.8-1.5): (1.5-2.5), and the amount of the reducing agent is increased (the reduction ratio is 0.8-1.5 times relative to step S1) to ensure that after partial reduction in step S1, the molybdenum source can be further completely reduced to the target valence state (such as +4 or +2), thereby further improving the purity, fluidity and stability of the product.

[0022] In a possible implementation manner, in step S3, the reaction time is 1-3 hours.

[0023] Compared with the prior art, the above technical solution is adopted to control the time of step S3 to 1-3 hours. The reaction time of 1-3 hours is the optimal time to ensure that the molybdenum source fully reacts with isooctanoic acid, acetic acid, and pour point depressant, and can complete the final reduction, complexation, and stabilization of the product molecular structure. At this time, the molybdenum source is completely converted into an isooctanoic acid molybdenum complex with high activity and high molybdenum content under high temperature conditions, further achieving complete reduction, complexation, and product stability improvement of molybdenum, and significantly improving the quality and industrial applicability of the catalyst.

[0024] Another technical problem to be solved by the present invention is to provide a molybdenum isooctanoate catalyst to solve the problems of insufficient molybdenum content, poor fluidity, easy solidification and low purity of conventional catalysts in the prior art.

[0025] In order to overcome the defects of the above prior art, the present invention provides a molybdenum isooctanoate catalyst, which is prepared by the above method and has a molybdenum content of greater than or equal to 16%.

[0026] Compared with the prior art, the molybdenum isooctanoate catalyst in this application has the following advantages: High molybdenum content (≥16%): The molybdenum in the catalyst forms a stable metal organic complex through efficient complexation with isooctanoic acid, which ensures high concentration distribution of molybdenum, improves the activity of the catalyst in industrial applications, and can significantly enhance the catalytic efficiency in the fields of lubricating oil preparation and petroleum processing; Excellent fluidity and storage stability: The interaction between catalyst molecules is regulated to avoid excessive aggregation between molecular chains, lower the freezing point, and keep the catalyst liquid at a relatively low temperature, solving the problem of traditional catalysts being easily solidified during low-temperature storage, making it easier to transport, store and use continuously; High purity and chemical stability: The catalyst of the present invention avoids interference from by-products or other impurities through strict impurity control and complex optimization, and its molecular structure remains stable under a variety of chemical environments, thereby improving the adaptability of the catalyst under high temperature, high pressure or complex chemical reaction conditions, enabling it to play a role in a wider range of industrial environments; High-efficiency catalytic performance: The catalyst of the present invention has a high degree of exposure of the active center of the molybdenum complex, which can efficiently contact the reactants and participate in the catalytic reaction. At the same time, the special coordination structure of the molybdenum complex can promote the formation and conversion of reaction intermediates. Therefore, the catalyst of the present invention exhibits higher catalytic efficiency and selectivity in applications such as petroleum hydrocracking and lubricating oil modification, significantly improving the economic efficiency of the industrial process.

[0027] Durability and long service life: The molecular structure of the catalyst of the present invention has been stabilized, which reduces the probability of loss or deactivation of active centers and enhances the stability of chemical bonds. Therefore, during repeated use, the catalytic performance remains stable, reducing the frequency of replacement and further reducing industrial production costs.

[0028] Another technical problem to be solved by the present invention is to provide an application of a molybdenum isooctanoate catalyst, wherein the application includes the application of the catalyst in lubricating oil manufacturing, petroleum processing and industrial catalysis of coatings and paints.

[0029] Compared with the prior art, the application of a molybdenum isooctanoate catalyst in the present application has the following advantages: compared with conventional catalysts, the molybdenum isooctanoate catalyst of the present invention exhibits higher catalytic efficiency, higher reaction selectivity, better stability and economy in lubricant oil manufacturing, petroleum processing and coating paint applications, can more efficiently adjust the viscosity and antioxidant properties of the lubricant oil, improve the service life and durability of the lubricant oil, and provide strong technical support and economic advantages for related industrial applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The present invention is a flow chart of a method for preparing a molybdenum isooctanoate catalyst. DETAILED DESCRIPTION

[0031] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0032] The present invention provides a method for preparing a molybdenum isooctanoate catalyst, comprising the following steps: S1: Mixing and heating reaction: mixing a molybdenum source, isooctanoic acid, acetic acid and a reducing agent in a molar ratio of 1: (2.5-4.5): (1.5-2.5): (1.5-2.5) and reacting to partially reduce the molybdenum source to obtain a reaction mixture; S2: vacuum distillation and temperature reaction: the reaction mixture obtained in step S1 is subjected to vacuum distillation, then the temperature is raised to 120-140° C., and the reducing agent and pour point depressant are added again, and the reaction is continued for 1-3 hours; S3: Final heating reaction: The reaction mixture obtained in step S2 is again subjected to reduced pressure distillation and then heated to 180-200° C., and then the heating is stopped and the reaction is kept warm to obtain a molybdenum isooctanoate catalyst.

[0033] As a preferred solution, in step S1, the molybdenum source is molybdic acid or ammonium molybdate.

[0034] As a preferred solution, in step S1, the reducing agent is hydrazine hydrate or oxalic acid.

[0035] As a preferred solution, in step S1, the pour point depressant is polymethacrylate or polyoctadecyl acrylate.

[0036] As a preferred solution, in step S1, the reaction conditions after mixing are: reacting at 80-100° C. for 1-3 hours.

[0037] As a preferred solution, in step S2, the molar ratio of the reducing agent to the reducing agent in step S1 is (0.8-1.5):(1.5-2.5), and the added mass of the pour point depressant is 0.01-0.1% of the reaction mixture.

[0038] As a preferred solution, in step S3, the reaction time is 1-3 hours.

[0039] The present invention also provides a molybdenum isooctanoate catalyst, which is prepared by the above method and has a molybdenum content of greater than or equal to 16%.

[0040] The present invention also provides an application of the molybdenum isooctanoate catalyst, which includes application of the catalyst in lubricating oil manufacturing, petroleum processing and industrial catalysis of coatings and paints.

[0041] The following is a further description and explanation of the technical solution of the present invention in combination with the above technical solution and specific data: Embodiment 1: This embodiment provides a molybdenum isooctanoate catalyst and a preparation method thereof, wherein the preparation method comprises the following steps: Step S1: Mixing and heating reaction Molybdic acid was selected as the molybdenum source and oxalic acid was selected as the reducing agent. Molybdic acid, isooctanoic acid, acetic acid and oxalic acid in a molar ratio of 1:2.5:1.5:1.5 were mixed and placed in a reactor. The mixture was magnetically stirred at 80°C and reacted at a constant temperature for 1 hour to partially reduce the molybdenum source and obtain a reaction mixture.

[0042] Step S2: Vacuum distillation and temperature reaction The mixture obtained in step S1 is distilled under reduced pressure to remove volatile impurities, and then the temperature is raised to 120° C., oxalic acid with a molar ratio of 0.8:1.5 between the reducing agent and the reducing agent in step S1, and 0.01% polymethacrylate pour point depressant based on the mass of the reaction mixture are added, and the reaction is continued at a constant temperature for 1 hour to completely reduce the molybdenum source to a highly active valence state and improve the fluidity of the product.

[0043] Step S3: Final heating reaction After distillation under reduced pressure again, the temperature was raised to 180° C. and the reaction was carried out at a constant temperature for 1 hour to form a stable organic molybdenum complex, thereby obtaining a molybdenum isooctanoate catalyst with good fluidity and not easy to solidify.

[0044] Catalyst performance test: The molybdenum content of the catalyst was measured to be 16.2%. In a low temperature (-10°C) storage environment, the catalyst remained liquid with good fluidity and no solidification.

[0045] Embodiment 2: This embodiment provides a molybdenum isooctanoate catalyst and a preparation method thereof, wherein the preparation method comprises the following steps: Step S1: Mixing and heating reaction Molybdic acid was selected as the molybdenum source and oxalic acid was selected as the reducing agent. Molybdic acid, isooctanoic acid, acetic acid and oxalic acid in a molar ratio of 1:3.5:2:2 were mixed and placed in a reactor. The mixture was magnetically stirred at 90°C and reacted at a constant temperature for 1.5 hours to partially reduce the molybdenum source and preliminarily form a molybdenum complex.

[0046] Step S2: Vacuum distillation and temperature reaction The mixture obtained in step S1 was subjected to reduced pressure distillation to remove volatile components, and then the temperature was raised to 130° C., oxalic acid with a molar ratio of 1.2:2 between the reducing agent and the reducing agent in step S1, and 0.03% polymethacrylate pour point depressant by mass of the reaction mixture were added, and the reaction was continued at a constant temperature for 2.5 hours to further stabilize the reaction system and improve the fluidity of the catalyst.

[0047] Step S3: Final heating reaction After distillation under reduced pressure again, the temperature was raised to 190° C. and the reaction was carried out at a constant temperature for 2.5 hours to generate a high-purity molybdenum isooctanoate catalyst.

[0048] Catalyst performance test: The molybdenum content of the catalyst was measured to be 16.5%. It showed excellent catalytic activity in the petroleum hydrocracking experiment and significantly improved the yield of light oil. In a low-temperature (-10°C) storage environment, the catalyst remained liquid with good fluidity and no solidification.

[0049] Embodiment 3: This embodiment provides a molybdenum isooctanoate catalyst and a preparation method thereof, wherein the preparation method comprises the following steps: Step S1: Mixing and heating reaction Ammonium molybdate was selected as the molybdenum source and hydrazine hydrate was selected as the reducing agent. Ammonium molybdate, isooctanoic acid, acetic acid and hydrazine hydrate in a molar ratio of 1:4.5:2.5:2.5 were mixed and placed in a reactor. The mixture was magnetically stirred at 100°C and reacted at a constant temperature for 2 hours to partially reduce the molybdenum source and generate an intermediate complex.

[0050] Step S2: Vacuum distillation and temperature reaction The mixture obtained in step S1 is subjected to reduced pressure distillation to remove volatile impurities, and then the temperature is raised to 140° C., hydrazine hydrate with a molar ratio of 1.5:2.5 between the reducing agent and the reducing agent in step S1, and 0.1% of polyacrylate octadecyl pour point depressant by mass of the reaction mixture are added, and the reaction is continued at a constant temperature for 3 hours to completely reduce the molybdenum source and improve the fluidity and chemical stability of the catalyst.

[0051] Step S3: Final heating reaction After distillation under reduced pressure again, the temperature was raised to 200° C. and the reaction was carried out at a constant temperature for 3 hours to finally obtain a molybdenum isooctanoate catalyst with good fluidity and homogeneity.

[0052] Catalyst performance test: The molybdenum content of the catalyst was measured to be 16.3%. In the lubricating oil modulation experiment, it effectively improved the anti-oxidation performance and stability of the oil. In the low temperature (-10°C) storage environment, the catalyst remained liquid, with good fluidity and no solidification.

[0053] According to the above embodiments, it is also further explained that the present invention provides a molybdenum isooctanoate catalyst and its preparation method and application. By adopting the technical principles such as the staged reduction strategy, the introduction of the pour point depressant, the optimization of the reaction conditions and the multiple vacuum distillation processes, the conventional preparation methods in the background technology are effectively solved. The problems of complex process, high cost, insufficient molybdenum content, easy solidification of the product and low purity, the molybdenum isooctanoate catalyst prepared by the present invention has the following significant advantages:

[0054] High Molybdenum Content (≥16%): By optimizing the complexation reaction and reduction process between the molybdenum source and isooctanoic acid, a high concentration of molybdenum in the catalyst is ensured, thereby improving the activity of the catalyst and the efficiency of industrial application. Excellent fluidity and storage stability: The preparation method of the present invention introduces polymethacrylate or polyoctadecyl acrylate as a pour point depressant, which significantly reduces the solidification tendency of the catalyst, so that the catalyst remains liquid in a low temperature environment, which is convenient for storage, transportation and continuous operation; High purity and chemical stability: The preparation method of the present invention effectively removes impurities through multiple vacuum distillations and combines the staged reaction control technology to generate a molybdenum complex with stable chemical properties, thereby ensuring the durability and stability of the catalyst under complex industrial conditions. Highly efficient catalytic performance: The active center of the catalyst is fully exposed, with higher reaction selectivity and catalytic efficiency. It is widely used in lubricant manufacturing, petroleum processing, coatings and paints, and significantly improves product quality and production efficiency. Economy and process simplicity: The preparation method of the present invention reduces production costs and improves the feasibility of industrial-scale production by optimizing raw material selection and simplifying the reaction process. In summary, the present invention provides an efficient and economical solution for related industrial applications by providing a molybdenum isooctanoate catalyst with high molybdenum content, good fluidity, high purity and excellent stability and a preparation method thereof, showing broad market promotion value and technical prospects.

[0055] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "in the present embodiment", "specific example", or "some examples" etc. means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0056] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A method for preparing a molybdenum isooctanoate catalyst, characterized in that: The following steps are involved: S1: Mixing and heating reaction: mixing a molybdenum source, isooctanoic acid, acetic acid and a reducing agent in a molar ratio of 1: (2.5-4.5): (1.5-2.5): (1.5-2.5) and reacting to partially reduce the molybdenum source to obtain a reaction mixture; S2: vacuum distillation and temperature reaction: the reaction mixture obtained in step S1 is subjected to vacuum distillation, then the temperature is raised to 120-140° C., and the reducing agent and pour point depressant are added again, and the reaction is continued for 1-3 hours; S3: Final heating reaction: The reaction mixture obtained in step S2 is again subjected to reduced pressure distillation and then heated to 180-200° C., and then the heating is stopped and the reaction is kept warm to obtain a molybdenum isooctanoate catalyst.

2. The preparation method of the molybdenum isooctanoate catalyst according to claim 1, characterized in that: In the step S1, the molybdenum source is molybdic acid or ammonium molybdate.

3. The preparation method of the molybdenum isooctanoate catalyst according to claim 1, characterized in that: In the step S1, the reducing agent is hydrazine hydrate or oxalic acid.

4. The preparation method of the molybdenum isooctanoate catalyst according to claim 1, characterized in that: In the step S1, the pour point depressant is polymethacrylate or polyoctadecyl acrylate.

5. The preparation method of the molybdenum isooctanoate catalyst according to claim 1, characterized in that: In the step S1, the reaction conditions after mixing are: reacting at 80-100° C. for 1-3 hours.

6. The method for preparing a molybdenum isooctanoate catalyst according to claim 1, wherein In step S2, the molar ratio of the reducing agent to the reducing agent in step S1 is (0.8-1.5): (1.5-2.5), and the added mass of the pour point depressant is 0.01-0.1% of the reaction mixture.

7. The preparation method of the molybdenum isooctanoate catalyst according to claim 1, characterized in that: In step S3, the reaction time is 1-3 hours.

8. A molybdenum isooctanoate catalyst, characterized in that The molybdenum isooctanoate catalyst is prepared by the method according to any one of claims 1 to 7, and the molybdenum content of the molybdenum isooctanoate is greater than or equal to 16%.

9. An application of the molybdenum isooctanoate catalyst according to claim 8, characterized in that: The applications include application of the catalyst in lubricating oil manufacturing, petroleum processing and industrial catalysis of coatings and paints.

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