Preparation method and application of high-stability vanadium capturing agent

Abstract

The application discloses a preparation method of a high-stability vanadium capturing agent, and comprises the following steps: S1, drying an inorganic magnesium compound powder and then adding the powder into fuel oil and stirring uniformly; S2, modifying the mixture after stirring in the step S1 by using a coupling agent for the first time; S3, modifying the product after the first modification in the step S2 by using a higher fatty acid for the second time; and S4, adding a supramolecular dispersing agent and an oil product stabilizer into the product after the second modification in the step S3 and stirring until the solution is clear and transparent, so that the high-stability vanadium capturing agent is obtained. The vanadium capturing agent prepared by the method can fix vanadic acid to generate immovable vanadic acid salt in an FCC device, so that vanadic acid is transferred from catalyst particles to vanadium capturing agent particles, and damage of vanadic acid to molecular sieve is avoided; the vanadium capturing agent does not need to add rare earth metal additionally, and has the advantages of high stability, dilution resistance, high activation index, can be mixed with fuel oil at an arbitrary ratio and is not stratified and not precipitated.

Description

Technical Field

[0001] This invention relates to the field of catalytic cracking technology, specifically to a method for preparing and applying a highly stable inorganic magnesium vanadium scavenger. Background Technology

[0002] In recent years, with the development of oilfields in western my country, the production of Tarim crude oil, which has a high vanadium content, has increased year by year. In addition, the vanadium content in Middle Eastern crude oil processed in my country is also increasing, leading to a continuous increase in vanadium contamination of FCC (fluid catalytic cracking) catalysts. Vanadium in the feedstock entering the catalytic cracking unit competes with zeolite catalysts for adsorption sites, hindering the interaction between the zeolite catalyst and the feedstock, increasing dehydrogenation reactions, and resulting in excessive hydrogen and coke production, affecting the selectivity of high-value-added products such as gasoline. Furthermore, vanadium is oxidized to low-melting-point V₂O₅, which, when steam is introduced into the regenerator, generates vanadic acid. Vanadic acid damages the zeolite molecular sieve crystals, reducing surface area and decreasing the activity of catalytic cracking and gasoline selectivity.

[0003] Vanadium scavengers are chemical additives used to reduce the impact of vanadium compounds in crude oil or refining processes. The magnesium they contain reacts with vanadic acid to form immobile vanadates, causing vanadic acid to transfer from the catalyst particles to the vanadium scavenger particles, thus preventing the vanadic acid from damaging the molecular sieve.

[0004] Vanadium scavengers are classified into water-soluble and oil-soluble types. Water-soluble vanadium scavengers have poor compatibility with fuel oil, resulting in uneven mixing and poor performance. Oil-soluble vanadium scavengers, on the other hand, mix well with fuel oil and are currently the more widely used products. Existing vanadium scavengers utilize magnesium compounds such as magnesium oxide, magnesium hydroxide, basic magnesium carbonate, magnesium acetate, magnesium chloride, and magnesium sulfate. Except for magnesium oxide and magnesium hydroxide, oil-soluble vanadium scavengers made from other magnesium compounds tend to have low magnesium content and are prone to crystallization and clogging when added to fuel oil. Magnesium hydroxide and magnesium oxide are environmentally friendly, have high thermal stability, and are inexpensive and readily available; however, their small particle size, high surface energy, and strong polarity make them prone to agglomeration, affecting their dispersibility in fuel oil. Both magnesium hydroxide and magnesium oxide are highly hydrophilic, while fuel oil is hydrophobic; therefore, unmodified magnesium oxide or magnesium hydroxide has poor compatibility with fuel oil and weak interfacial bonding.

[0005] CN114829005A discloses the preparation of a vanadium scavenging agent containing 0.1-20 wt% rare earth phosphorus oxides. However, the preparation process introduces phosphorus and rare earth elements, which not only increases costs but also generates phosphorus wastewater, causing environmental pollution. US5603823A discloses the preparation of a high-content heavy metal vanadium scavenging agent containing 10-30 wt% rare earth elements; CN104226235A discloses the preparation of a vanadium scavenging agent containing 5-15 wt% rare earth metal oxides other than cerium. However, the rare earth elements in the catalysts of the above patents enhance the strong acid content of the catalyst, resulting in increased coke and dry gas yields. CN102220175A and CN103627452A both disclose methods for preparing oil-soluble vanadium inhibitors. However, the vanadium inhibitors prepared by the above patents only use a single wet modification process and require the addition of catalysts, resulting in high costs. Furthermore, the prepared vanadium inhibitors have low magnesium content, are prone to crystallization and blockage, have poor stability, and are prone to clumping after prolonged storage. CN105695000A discloses a vanadium scavenger modified by dry method using a coupling agent. However, the inorganic magnesium compound in this vanadium scavenger is modified by dry method, resulting in insufficient chemical coating and a low activation index. The vanadium scavenger prepared subsequently may crystallize or separate into layers.

[0006] In summary, the market needs a vanadium scavenger that is free of rare earth metals, highly stable, and has a high magnesium content, which can ensure that the product remains dispersed for a long time and has anti-dilution properties, maintaining stable dispersion and preventing precipitation even after being diluted extensively by petroleum distillation products such as gasoline, diesel, and aromatic solvent oils. Summary of the Invention

[0007] To address the issues of insufficient chemical coating, low activation index, poor stability, and high cost in vanadium scavenging agents, this invention provides a method for preparing a highly stable vanadium scavenging agent. This method employs a two-stage wet modification process, eliminates the need for rare earth elements, effectively controls costs, and produces a vanadium scavenging agent with high stability, high activation index, and high chemical coating.

[0008] The technical solution adopted in this invention is: A method for preparing a highly stable vanadium scavenger, the detailed steps of which are as follows: S1: Dry the inorganic magnesium compound powder in an oven at 105-115℃ for 6-8 hours, then add fuel oil and stir evenly; where fuel oil is used as a solvent for the inorganic magnesium compound powder, therefore, there are no special requirements for its amount; S2: Modify the mixture after stirring in step S1 with a coupling agent; S3: The product modified in step S2 is modified a second time using higher fatty acids; S4: Add supramolecular dispersant and oil stabilizer to the product after secondary modification in step S3 and stir until the solution is clear and transparent to obtain a highly stable vanadium scavenger; the detailed stirring steps are as follows: add dispersant and stabilizer and stir for 1-2 hours at a stirring speed of 800-1000 r / min; finally, continue stirring with a high-speed shear machine for 0.5-1 hour at a stirring speed of 5000-8000 r / min.

[0009] This invention employs a two-stage wet modification process for inorganic magnesium compounds. Compared to dry modification, wet modification offers advantages such as uniform coating, greater controllability of factors, and a better working environment. Furthermore, compared to single modification, the two-stage modification exhibits a synergistic effect, resulting in inorganic magnesium compounds with improved hydrophobicity and specific surface area. Therefore, this invention utilizes a two-stage wet modification process to better prepare oil-soluble vanadium scavengers with high stability and high magnesium content.

[0010] Preferably, the inorganic magnesium compound is one or both of magnesium hydroxide and magnesium oxide.

[0011] Magnesium oxide and magnesium hydroxide were chosen because oil-soluble vanadium scavengers prepared from other magnesium compounds have low magnesium content and are prone to crystallization and blockage. In addition, they are green and environmentally friendly, have high thermal stability, and are inexpensive and readily available.

[0012] Preferably, the particle size of the inorganic magnesium compound is between 3000 and 8000 mesh. Inorganic magnesium compounds with this particle size are micro-nano-scale inorganic magnesium compounds with a large specific surface area, which are easy to modify. The modified magnesium compounds are more hydrophobic.

[0013] Preferably, the fuel oil is one or a mixture of more than one of base oil, aromatic solvent oil, white oil, and diesel oil.

[0014] Preferably, the coupling agent is one or a mixture of more than one of silane coupling agents, borate coupling agents, titanate coupling agents, aluminate coupling agents, and phosphate esters. The coupling agent is an organic compound with an amphoteric structure. One end of its molecule is a polar group that can react with the functional groups on the surface of inorganic magnesium compound powder particles to form a strong chemical bond, and the other end is a nonpolar group that can physically entangle with fuel oil. It can build a "molecular bridge" between inorganic magnesium compound and fuel oil, increasing the dispersibility of inorganic magnesium compound in fuel oil.

[0015] Preferably, the higher fatty acid is one or a mixture of more than one of oleic acid, tall oleic acid, 12-hydroxystearic acid, stearic acid, palmitic acid, and linoleic acid. Higher fatty acids are surfactant molecules composed of lipophilic (also called hydrophobic) and hydrophilic (also called oleophobic) groups. The hydrophilic group can chemically or physically interact with the surface of the inorganic magnesium compound, adsorbing onto the surface of the inorganic magnesium compound powder particles. With the lipophilic group facing outwards, the surface of the inorganic magnesium compound powder changes from hydrophilic to hydrophobic, thereby improving the affinity between the inorganic magnesium compound and fuel oil, and enhancing its compatibility and dispersibility in fuel oil.

[0016] Preferably, in steps S2 and S3, the first modification temperature is 45-60℃ and the modification time is 0.5-1 hour; the second modification temperature is 110-120℃ and the modification time is 1-2 hours.

[0017] Preferably, the supramolecular dispersant is a block copolymer containing carboxyl or amino groups, a block copolymer containing ester groups, or a polyether-type block copolymer. The supramolecular dispersant has an amphiphilic structure similar to traditional surfactants, but replaces the lipophilic and hydrophilic groups of the surfactant with solvating chains and anchoring groups. The solvating chains have good compatibility with the dispersion medium, adopt a relatively extended conformation in the dispersion medium, and form a sufficiently thick protective layer on the surface of the inorganic magnesium compound powder particles.

[0018] Preferably, the oil stabilizer is a fatty alcohol polyoxyethylene ether, sorbitan fatty ester, alkylphenol polyoxyethylene ether, or hydrogenated castor oil polyoxyethylene ether, etc. Oil stabilizers can reduce surface tension and increase product stability.

[0019] Preferably, the highly stable vanadium scavenger prepared by the above method is used in a catalytic cracking unit. Beneficial effects

[0020] This invention employs a two-stage wet process to modify inorganic magnesium compounds. The vanadium scavenger prepared by this method can fix vanadium acid in an FCC device to form immobile vanadate, allowing vanadium acid to transfer from the catalyst particles to the vanadium scavenger particles, thus avoiding damage to the molecular sieve caused by vanadium acid. This vanadium scavenger does not require the addition of rare earth metals and has the advantages of high stability, anti-dilution properties, high activation index, and the ability to be mixed with fuel oil in any proportion without stratification or precipitation. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the appendix and embodiments.

[0022] 1. Activation Index Determination: Inorganic magnesium compound powder has a highly polar surface, is hydrophilic and oleophobic, and has good water wettability. When added to water, it will naturally sink. However, surface-modified inorganic magnesium compound powder exhibits hydrophobicity. Therefore, when the modified inorganic magnesium compound powder is added to water, the modified inorganic magnesium compound will float on the surface, while the unmodified inorganic magnesium compound will sink to the bottom. The ratio of the mass of the inorganic magnesium compound floating on the surface to the total mass is the activation index. The modification effect can be evaluated based on the magnitude of the activation index.

[0023] Test procedure: Weigh 3.0000 g of the modified inorganic magnesium compound and add it to a separatory funnel containing 200 mL of distilled water. After thorough mixing, let it stand for 45 min. Then, filter, dry, and weigh the inorganic magnesium compound powder that has settled to the bottom of the separatory funnel. The mass of the floating sample is obtained by subtracting the mass of the sample at the bottom of the settling funnel from the total mass of the tested sample. The activation index of the tested sample is calculated according to the following formula: H = (m - m0m) / m × 100% Where: H: represents the activation index of the sample being tested; m0 is the mass of the powder that settles at the bottom of the separatory funnel; m is the total mass of the sample being tested.

[0024] 2. Determination of magnesium content: Take m1 g of sample and place it in a muffle furnace. Calcine it at 900 ℃ for eight hours. Cool and weigh it. The residual weight is m2 g. Substitute it into the formula Mg%=(m2 / m1)*(24.3 / 40.3)*100%.

[0025] 3. Stability test: Take 10.00 g of sample and add it to a centrifuge tube. Place the tube in a centrifuge and set the centrifuge speed to 500 rpm. Run for half an hour and observe that there is no sediment at the bottom, no sediment on the inner wall of the centrifuge tube, and no stratification of the sample.

[0026] 4. Anti-dilution test: Take 10.00 g of sample and mix it with fuel oil in different proportions (10%, 20%, 30%, 40%, 50%). Observe whether there is sediment at the bottom of the diluted sample after 24 h, 48 h and 7 days, whether it is layered, and whether it is clear and uniform. Example 1

[0027] S1: Weigh 74.35g of inorganic magnesium compound powder with a particle size of 3000 mesh and put it into an oven. Dry it at 115 ℃ for 8 hours, and then add 13.15g of 1800# solvent oil and stir evenly.

[0028] S2: Modify the mixture after stirring in step S1 with 2g of aluminate coupling agent at 45℃ for 45 minutes.

[0029] S3: The product modified once in step S2 is modified with 7g of tall oleic acid at 110 °C for 2 hours.

[0030] S4: Add 3g of supramolecular dispersant L-64 and 0.5g of oil stabilizer AEO-9 to the product after secondary modification in step S3 and stir at a stirring speed of 900 r / min for 1.5 hours. Finally, stir at 5000 r / min for 1 hour using a high-speed shear machine to obtain a highly stable vanadium scavenger.

[0031] The product is a dark brown liquid with low viscosity. The magnesium content was determined to be 29.37%. Stability test results: No sediment was found at the bottom of the centrifuge tube, no sediment was found on the inner wall of the centrifuge tube, the sample did not separate into layers, and the sample stability was good. Example 2

[0032] S1: Weigh 51.62g of inorganic magnesium compound powder with a particle size of 5000 mesh and put it into an oven. Dry it at 115 ℃ for 6 hours, and then add it to 27.38g of diesel oil and stir evenly.

[0033] S2: Modify the mixture after stirring in step S1 with 5.00g of borate ester coupling agent at 60 ℃ for 30 minutes.

[0034] S3: Modify the product after the first modification in step S2 with 10.00g of stearic acid at 120℃ for 2 hours.

[0035] S4: Add 5g of supramolecular dispersant KMT-3504, 0.5g of oil stabilizer Span 80, and 0.5g of oil stabilizer OA-10 to the product after secondary modification in step S3 and stir at 800 r / min for 2 hours. Finally, stir at 8000 r / min for half an hour using a high-speed shear machine to obtain a highly stable vanadium scavenger.

[0036] The product is a dark brown liquid with low viscosity. The magnesium content was determined to be 20.39%. Stability test results: No sediment was found at the bottom of the centrifuge tube, no sediment was found on the inner wall of the centrifuge tube, the sample did not separate into layers, and the sample stability was good. Example 3

[0037] S1: Weigh 40.35 g of inorganic magnesium compound powder with a particle size of 8000 mesh and put it into an oven. Dry it at 105 °C for 7 hours, and then add it to 42.9 g of D40 solvent oil and stir evenly.

[0038] S2: Modify the mixture after stirring in step S1 with 4g of silane coupling agent at 45℃ for 1 hour.

[0039] S3: Modify the product after the first modification in step S2 with 8 g of oleic acid at 115 °C for 1.5 hours.

[0040] S4: Add 4g of supramolecular dispersant KMT-3504, 0.5g of oil stabilizer Span 80, and 0.25g of oil stabilizer TX-10 to the product after secondary modification in step S3 and stir at 1000 r / min for 1 hour. Finally, stir at 6500 r / min for 45 minutes using a high-speed shear machine to obtain a highly stable vanadium scavenger.

[0041] The product is a dark brown liquid with low viscosity. The magnesium content was determined to be 15.94%. Stability test results: No sediment was found at the bottom of the centrifuge tube, no sediment was found on the inner wall of the centrifuge tube, the sample did not separate into layers, and the sample stability was good. Example 4

[0042] S1: Weigh 65.54g of inorganic magnesium compound powder with a particle size of 5000 mesh and put it into an oven. Dry it at 110 ℃ for 8 hours, and then add it to 18.96g of 36# white oil and stir evenly.

[0043] S2: Modify the mixture after stirring in step S1 with 2g of titanate at 55 °C for 45 minutes.

[0044] S3: Modify the product after the first modification in step S2 with 8g of 12-hydroxystearic acid at 120 °C for 1 hour.

[0045] S4: Add 5g of supramolecular dispersant L-64 and 0.5g of oil stabilizer TX-10 to the product after secondary modification in step S3 and stir at 1000 r / min for 1 hour. Finally, stir at 8000 r / min for half an hour using a high-speed shear machine to obtain a highly stable vanadium trap.

[0046] The product is a dark brown liquid with low viscosity. The magnesium content was determined to be 25.89%. Stability test results: No sediment was found at the bottom of the centrifuge tube, no sediment was found on the inner wall of the centrifuge tube, the sample did not separate into layers, and the sample stability was good. Example 5

[0047] S1: Weigh 29.87g of inorganic magnesium compound powder with a particle size of 5000 mesh and put it into an oven. Dry it at 115 ℃ for 6 hours, and then add it to 53.13g of heavy diesel oil and stir evenly.

[0048] S2: Modify the mixture after stirring in step S1 with 1.5g of aluminate and 1.5g of silane coupling agent at 50 °C for 1 hour.

[0049] S3: Modify the product after the first modification in step S2 with 8g of palmitic acid at 120 °C for 1.5 hours.

[0050] S4: Add 5g of supramolecular dispersant L-64 and 1g of oil stabilizer HEL-40 to the product after secondary modification in step S3 and stir at 800 r / min for 2 hours. Finally, stir at 5000 r / min for 1 hour using a high-speed shear machine to obtain a highly stable vanadium trap.

[0051] The product is a dark brown liquid with low viscosity. The magnesium content was determined to be 11.8%. Stability test results: No sediment was found at the bottom of the centrifuge tube, no sediment was found on the inner wall of the centrifuge tube, the sample did not separate into layers, and the sample stability was good. Example 6

[0052] S1: Weigh 65.54g of inorganic magnesium compound powder with a particle size of 6000 mesh and put it into an oven. Dry it at 115 ℃ for 7 hours. Then add 16.96g of 150# base oil and 36# white oil and stir evenly.

[0053] S2: Modify the mixture after stirring in step S1 with 4g of phosphate ester at 55 °C for 30 minutes.

[0054] S3: Modify the product after the first modification in step S2 with 8g of linoleic acid at 120℃ for 2 hours.

[0055] S4: Add 5g of supramolecular dispersant C102 and 0.5g of oil stabilizer OA-10 to the product after secondary modification in step S3 and stir at 900 r / min for 1.5 hours. Finally, stir at 6500 r / min for 45 minutes using a high-speed shear machine to obtain a highly stable vanadium scavenger.

[0056] The product is a dark brown liquid with low viscosity. The magnesium content was determined to be 25.89%. Stability test results: No sediment was found at the bottom of the centrifuge tube, no sediment was found on the inner wall of the centrifuge tube, the sample did not separate into layers, and the sample stability was good.

[0057] As can be seen from Examples 1-6, the vanadium scavenger prepared by the preparation method of the present invention has the characteristics of high stability, no stratification, and no precipitation.

[0058] The samples prepared in Example 1 were mixed with different fuels in different proportions, and their anti-dilution properties were tested. The test results are shown in Table 1.

[0059]

[0060] The data in Table 1 show that the vanadium scavenger prepared by the method of the present invention can be mixed with fuel oil in any proportion without separation or precipitation, indicating that the prepared vanadium scavenger has good anti-dilution properties and compatibility, high stability, and fully meets industrial requirements.

[0061] In addition, we prepared two vanadium scavengers according to the method disclosed in CN105695000A and investigated their activation index under the same conditions.

[0062] Magnesium oxide and magnesium hydroxide were mixed in a 3:7 ratio, dried, and screened for particle size. 0.8% silane coupling agent and 1.2% fatty acid were dissolved in toluene and added together to a high-speed kneader. The mixture was heated to 110°C and reacted for 15 minutes. After cooling, the mixture was transferred to a temperature-controlled reactor. 36# white oil and 200# solvent oil were added, along with 0.8% supramolecular dispersant. The mixture was stirred for 4 hours at 50°C. Then, a mixture of 3.5% dehydrated sorbitan fatty acid ester and alkylphenol polyoxyethylene ether was added and stirred for 1 hour. The mixture was then filtered and packaged.

[0063] Magnesium oxide and magnesium hydroxide were mixed in a 5:5 ratio, dried, and screened for particle size. 0.5% titanate coupling agent and 1.8% fatty acid were dissolved in toluene and added together to a high-speed kneader. The mixture was heated to 100°C and reacted for 18 minutes. After cooling, the mixture was transferred to a temperature-controlled reactor. 150# mineral oil and N24 solvent oil were added, along with 0.8% supramolecular dispersant. The mixture was stirred for 4 hours at 50°C. Then, a mixture of 3.2% fatty alcohol polyoxyethylene ether and sorbitan fatty ester was added and stirred for 2 hours. The mixture was then filtered and packaged.

[0064] The activation index of Examples 1-6 and Comparative Examples 1-2 was determined, and the results are shown in Table 2:

[0065]

[0066] The data in Table 2 show that the vanadium scavenger prepared by the method of the present invention has a higher activation index and produces a higher chemical coating amount.

[0067] In addition, we prepared a vanadium trap according to the method disclosed in CN104226235A and subjected it to advanced cracking evaluation technology together with residue feed under the same conditions. To examine its performance.

[0068] Comparative Example 3 (1) 80 g of small-pore alumina A1 (calculated as Al2O3) was added to deionized water and dispersed evenly. Then hydrochloric acid was added and the mixture was contacted for 30 minutes to obtain the first slurry. The pH value of the first slurry was 1.1 and the solid content was 15% by weight. (2) Next, add the MgO slurry (containing 700 g of MgO) dispersed in water and disperse it evenly. Then add 360 g of the phosphorus aluminum additive precursor P prepared in Preparation Example 3 (on a dry basis). After contacting at 55°C for 60 minutes, a second slurry is obtained. The pH value of the second slurry is 8.8 and the solid content is 23% by weight. (3) Then add 60g of macroporous alumina A (calculated as Al2O3) to obtain the third slurry, and contact it at room temperature (10-40℃). 15min; (4) After the third slurry is spray-dried and shaped, it is directly calcined at 550 ℃ for 2 h to obtain a solid. (5) At room temperature (10-40 °C), 940 g of the solid was contacted with 0.6 L of water-soluble magnesium source solution (MgCl2 aqueous solution, with a concentration of 100 g / L based on magnesium oxide) for 15 min. The mixture after contact was dried at 120 °C for 4 hours and then calcined at 600 °C for 2 hours to obtain the metal scavenger.

[0069] Advanced cracking evaluation tests were performed on Examples 1-6 and Comparative Example 3, and the results are shown in Table 3:

[0070] Table 3 shows that, under a conversion rate of 75 wt%, the vanadium scavenger of this invention has similar or even lower coke content, hydrogen content, hydrogen-to-methane ratio, and dry gas content compared to vanadium scavengers containing rare earth metals. The propylene, butene, and liquefied petroleum gas (LPG) content are also not significantly different from those of the vanadium scavengers containing rare earth metals. These data indicate that, under the same catalyst and feed conditions, the catalyst activities of the two are similar, the yields of the main catalytic cracking products are close, and the by-product yields are also not significantly different. In conclusion, the vanadium scavenger of this invention and the vanadium scavenger containing rare earth metals have similar vanadium metal capture effects.

[0071] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also within the protection scope of the present invention.

Claims

1. A method for preparing a highly stable vanadium scavenger, characterized in that... This includes the following steps: S1: Dry the inorganic magnesium compound powder and add it to the fuel oil, stirring until evenly mixed; S2: Modify the mixture after stirring in step S1 with a coupling agent; S3: The product modified in step S2 is modified a second time using higher fatty acids; S4: Add supramolecular dispersant and oil stabilizer to the product after secondary modification in step S3 and stir until the mixed solution is clear and transparent to obtain a highly stable vanadium scavenger. The particle size of the inorganic magnesium compound in step S1 is between 3000 and 8000 mesh; The higher fatty acids mentioned in step S3 are one or a mixture of more than one of oleic acid, tall oleic acid, 12-hydroxystearic acid, stearic acid, palmitic acid, and linoleic acid; The inorganic magnesium compound in step S1 is one or both of magnesium hydroxide and magnesium oxide; The fuel oil mentioned in step S1 is one or a mixture of more than one of base oil, aromatic solvent oil, white oil, and diesel oil; The coupling agent mentioned in step S2 is one or a mixture of more than one of silane coupling agents, borate coupling agents, titanate coupling agents, aluminate coupling agents, and phosphate esters; In steps S2 and S3, the first modification temperature is 45-60℃ and the modification time is 0.5-1 hour; the second modification temperature is 110-120℃ and the modification time is 1-2 hours.

2. The preparation method according to claim 1, characterized in that, The supramolecular dispersant in step S4 is a block copolymer containing carboxyl or amino groups, a block copolymer containing ester groups, or a polyether-type block copolymer, and the supramolecular dispersant accounts for 3-5% of the mixed solution.

3. The preparation method according to claim 1, characterized in that, The oil stabilizer in step S4 is fatty alcohol polyoxyethylene ether, sorbitan fatty ester, alkylphenol polyoxyethylene ether, or hydrogenated castor oil polyoxyethylene ether, and the oil stabilizer accounts for 0.5-1% of the mixed solution.

4. The application of the highly stable vanadium scavenger prepared by the preparation method according to any one of claims 1-3 in a catalytic cracking unit.

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