Preparation method of high-stability oil-soluble vanadium capturing agent

Abstract

The application discloses a preparation method of high-stability oil-soluble vanadium capturing agent, and comprises the following steps: (1) adding an alkaline earth base, a long-chain organic acid, a hydrophobic auxiliary agent and an oil-soluble dispersant into an inert oil agent to perform a heating reaction, cooling after the reaction, and performing ultrasonic dispersion on a stabilizer 2,6-di-tert-butyl-p-cresol to obtain an alkaline earth base vanadium capturing single agent; (2) adding a rare earth oxide, a fatty acid ester, an alkoxy alcohol or a non-ionic dispersant into the inert oil agent to perform a heating reaction, cooling after the reaction, and performing shear dispersion on the stabilizer 2,6-di-tert-butyl-p-cresol to obtain a rare earth base vanadium capturing single agent; and (3) mixing the alkaline earth base vanadium capturing single agent and the rare earth base vanadium capturing single agent, uniformly stirring, and standing to obtain the high-stability oil-soluble vanadium capturing agent. The method has the advantages of simple process and low production cost. The preparation process does not need complex equipment, the reaction condition is mild, the steps are simple, and continuous production can be realized. The prepared vanadium capturing agent can efficiently passivate vanadium, has high stability and a long storage period.

Description

Technical Field

[0001] This invention relates to the field of petrochemical technology, specifically to a method for preparing a highly stable oil-soluble vanadium scavenger. Background Technology

[0002] With the increasing proportion of heavy and low-quality crude oil processed, the vanadium content in feedstock oil continues to rise. In the high-temperature, oxygen-rich, and steam-filled conditions of the catalytic cracking unit regenerator, organoporphyrin vanadium is oxidized to vanadium pentoxide (V₂O₅), which has a melting point of 690 °C, lower than the regeneration temperature. V₂O₅ is molten and highly fluid, allowing it to enter the catalyst micropores, occupy active sites, and disrupt the catalyst's crystal structure. In the regenerator, V₂O₅ reacts with steam to form vanadic acid (H₃VO₄). The hydrolysis of vanadic acid leads to dealumination of the molecular sieve framework, crystal phase collapse, and a decrease in specific surface area, ultimately resulting in reduced catalyst activity, lower gasoline yield, and increased coke and dry gas yields.

[0003] Based on the overall reaction mechanism, vanadium contamination of the catalyst occurs through migration within the molecular sieve and disruption of its framework. Vanadium scavengers or inhibitors can be added to the molecular sieve to reduce vanadium mobility and prevent the formation of vanadate.

[0004] CN109092280A discloses a method for preparing vanadium-suppressing agents from attapulgite, involving modification of attapulgite with a surface-active component and mixing it with magnesium oxide and a binder. During the reaction, vanadium ions can better contact the vanadium-suppressing agent to form magnesium vanadate compounds; however, this catalyst is in solid form, making its addition in a catalytic cracking unit difficult to control. CN103627452A describes the reaction of magnesium salts with organic acids under the action of solvents and dispersants to generate magnesium carboxylate vanadium-suppressing agents. The above patents employ coupling agent modification or chain carboxylic acid modification, both belonging to small molecule modifiers. Small molecule chains are relatively short, resulting in poor modification effects and an inability to completely eliminate nanoparticle aggregation. This leads to the disadvantages of traditional magnesium-based vanadium-suppressing agents, such as strong hydrophilicity, high surface polarity, easy aggregation, sedimentation, and stratification; insufficient high-temperature hydrothermal stability; and limited vanadium-suppressing efficiency.

[0005] Therefore, developing a method for preparing and applying a vanadium scavenger that is simple in preparation process, produces products with high stability, and can be adapted to the requirements of catalytic cracking process has become an urgent technical problem to be solved. Summary of the Invention

[0006] To address the problem of short molecular chains, poor modification effects, and inability to completely eliminate nanoparticle aggregation, this invention provides a method for preparing a highly stable oil-soluble vanadium scavenger.

[0007] The technical solution adopted in this invention is: a method for preparing a highly stable oil-soluble vanadium scavenger, characterized by the following steps: (1) adding alkaline earth base, long-chain organic acid, hydrophobic additive and oil-soluble dispersant to an inert oil and heating to react, cooling to below 50°C after the reaction, adding stabilizer 2,6-di-tert-butyl-p-cresol and ultrasonically dispersing to obtain an alkaline earth base vanadium scavenger; (2) adding rare earth oxide, aliphatic carboxylic acid ester, alkoxy alcohol or nonionic dispersant to an inert oil and heating to react, cooling to below 50°C after the reaction, adding stabilizer 2,6-di-tert-butyl-p-cresol and shearing to disperse to obtain a rare earth base vanadium scavenger; (3) mixing the alkaline earth base vanadium scavenger and rare earth base vanadium scavenger obtained in steps (1) and (2), stirring evenly, and letting stand to obtain a highly stable oil-soluble vanadium scavenger.

[0008] Among them, alkaline earth components inhibit V2O5 migration, while rare earth components protect the molecular sieve framework, achieving efficient passivation of vanadium through a dual effect. Long-chain organic acids and aliphatic carboxylic esters are used for coating and esterification modification of metal oxides, reducing the surface polarity of metal oxides and exhibiting hydrophobic and oleophilic properties, allowing them to exist stably in inert oils. Hydrophobic agents (long-chain alcohols) and alkoxy alcohols enhance the compatibility of metal oxides with solvent oils, have hydrophobic effects, and improve product stability. Dispersants improve stability and prevent agglomeration during the reaction.

[0009] Preferably, the alkaline earth group in step (1) includes magnesium oxide, magnesium hydroxide, calcium oxide, and calcium hydroxide.

[0010] Preferably, the long-chain organic acid in step (1) is one or a mixture of two of isooctanoic acid and oleic acid. When the long-chain organic acid is a mixture of two, the mass ratio of isooctanoic acid to oleic acid is 0.2~0.5:1. The hydrophobic agent is one or a mixture of two of dodecyl alcohol and isooctyl alcohol. When the hydrophobic agent is a mixture of two, the mass ratio of dodecyl alcohol to isooctyl alcohol is 1~2:1. The oil-soluble dispersant is one or a mixture of two of polyisobutylene succinimide (T154) and alkylphenol polyoxyethylene ether (NP-4). When the oil-soluble dispersant is a mixture of two, the mass ratio of polyisobutylene succinimide to alkylphenol polyoxyethylene ether is 0.5~1:1. The amount of stabilizer added is 0.1~0.3% of the total mass of the system. The system includes alkaline earth base, long-chain organic acid, hydrophobic agent, oil-soluble dispersant and inert oil in a mass ratio of 100:35~36:8~12:4~6:600.

[0011] Preferably, in step (1), the temperature is heated to 120~180℃ and the reaction time is 2-4h; the ultrasonic dispersion temperature is 30~50℃ and the time is 1~2 hours.

[0012] Preferably, in step (1), the alkaline earth base needs to be dried in advance to a moisture content of ≤0.5% to avoid the introduction of moisture leading to system stratification and decreased stability; during the heating reaction, continuous stirring is required at a stirring speed of 300~600r / min to ensure that each component reacts fully and to avoid particle agglomeration caused by insufficient local reaction.

[0013] Preferably, in step (1), the power of ultrasonic dispersion is 100~200W to ensure that the stabilizer is uniformly dispersed in the system, fully exert its antioxidant effect, improve the storage stability of the vanadium capture agent, and avoid oxidation and deterioration of long-chain components.

[0014] Preferably, the inert oil in steps (1) and (2) is white oil or high-boiling-point aromatic solvent oil.

[0015] Preferably, the rare earth oxides in step (2) include cerium oxide, lanthanum oxide and neodymium oxide.

[0016] Preferably, the aliphatic carboxylic ester in step (2) is one or a mixture of two of methyl stearate or ethyl palmitate. When the aliphatic carboxylic ester is a mixture of two, the mass ratio of methyl stearate to ethyl palmitate is 0.3~0.6:1; the alkoxy alcohol is one or a mixture of two of ethylene glycol monododecyl ether or propylene glycol monotetradecyl ether. When the alkoxy alcohol is a mixture of two, the mass ratio of ethylene glycol monododecyl ether to propylene glycol monotetradecyl ether is 1~2:1; and the nonionic dispersant is a polyoxyethylene-polyoxypropylene block copolymer. The nonionic dispersant is one or a mixture of two of the following: polyoxyethylene polyoxypropylene block copolymer (F68) or sorbitan monostearate (Span-60). When the nonionic dispersant is a mixture of two, the mass ratio of polyoxyethylene polyoxypropylene block copolymer to sorbitan monostearate is 0.5 to 1:1. The amount of stabilizer added is 0.1 to 0.3% of the total mass of the system. The system includes rare earth oxides, aliphatic carboxylic acid esters, alkoxy alcohols, nonionic dispersants, and inert oils in a mass ratio of 100:26 to 60:5 to 6:4 to 6:500.

[0017] Preferably, in step (2), the temperature is heated to 100~150℃ and the reaction time is 2-4h; the shear dispersion temperature is controlled at 30~50℃ and the time is 1~2 hours.

[0018] Preferably, in step (2), the rare earth oxides need to be crushed to a particle size of 100~200 mesh in advance and dried to a moisture content of ≤0.5% to facilitate the coating modification of aliphatic carboxylic acid esters and the dispersion of dispersants, thereby improving the uniformity of vanadium capture agent; during the heating reaction, continuous stirring is required at a stirring speed of 300~600 r / min to ensure that the reaction proceeds fully.

[0019] Preferably, in step (2), the rotation speed of shear dispersion is 1000~2000 r / min to ensure uniform dispersion of antioxidant stabilizer, while further dispersing the modified aluminum hydroxide particles to avoid agglomeration and improve the stability and oil solubility of vanadium capture agent.

[0020] Preferably, in step (3), the alkaline earth-based vanadium chelating agent and the rare earth-based vanadium chelating agent are mixed at a mass ratio of 1 to 3:1, with a stirring speed of 200 to 500 r / min, a stirring time of 30 to 60 min, and a stirring temperature of 30 to 50 °C. After stirring evenly, the mixture is allowed to stand for 10 to 20 min to obtain a highly stable oil-soluble vanadium chelating agent. More preferably, the standing time after stirring is preferably 15 min, which can effectively remove any trace impurities that may exist in the system and ensure that the final product is a homogeneous oily liquid without stratification or precipitation.

[0021] The beneficial effects of this invention are: The vanadium-capturing agent prepared in this application exhibits high vanadium capture efficiency and significant synergistic effect. This invention employs a combination of alkaline earth-based and rare earth-based vanadium-capturing agents. The alkaline earth component inhibits V₂O₅ migration, while the rare earth component protects the molecular sieve framework, achieving efficient passivation of vanadium through a dual action. It also demonstrates high stability and a long storage period. Both vanadium-capturing agents contain stabilizers to effectively prevent high-temperature oxidation of long-chain components. The preparation process is simple and has low production costs. The preparation process requires no complex equipment, uses mild reaction conditions, and involves simple steps, enabling continuous production. Detailed Implementation

[0022] 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 a preferred embodiment. Example 1

[0023] A method for preparing a highly stable oil-soluble vanadium scavenger includes the following steps: (1) Preparation of alkaline earth-based vanadium-capturing agent: 100g of calcium hydroxide (dried to a moisture content of 0.2%), 35g of isooctanoic acid, 8g of dodecanol, and 4g of polyisobutylene succinimide (T154) were added to 600g of white oil and placed in a stirring device. The mixture was heated to 150℃ under stirring at 300r / min and reacted for 3 hours. The temperature was then lowered to 40℃, and 1g of 2,6-di-tert-butyl-p-cresol was added. The mixture was ultrasonically dispersed at 150W for 1.5 hours to obtain the calcium-based vanadium-capturing agent.

[0024] (2) Preparation of rare earth-based vanadium-capturing agent: 100 g of cerium oxide (crushed to 150 mesh and dried to a moisture content of 0.3%), 40 g of methyl stearate, 6 g of ethylene glycol monododecyl ether, and 4 g of polyoxyethylene-polyoxypropylene block copolymer (F68) were added to 500 g of white oil and placed in a stirring device. The mixture was heated to 120 °C under stirring at 300 r / min and reacted for 3 hours. The temperature was then lowered to 40 °C, and 0.8 g of 2,6-di-tert-butyl-p-cresol was added. The mixture was sheared and dispersed at 1500 r / min for 1.5 hours to obtain the cerium-based vanadium-capturing agent.

[0025] (3) Preparation of vanadium scavenging agent by compounding: The two single agents above are mixed at a mass ratio of 2:1, stirred at 400r / min for 45min, stirred at 40℃, and left to stand for 15min to remove trace precipitates, and a highly stable oil-soluble vanadium scavenging agent is obtained.

[0026] The vanadium scavenger prepared in this embodiment is a pale yellow, homogeneous, oily liquid that shows no stratification or deterioration after being stored at room temperature in a sealed container for 7 months. Example 2

[0027] A method for preparing a highly stable oil-soluble vanadium scavenger includes the following steps: (1) Preparation of alkaline earth vanadium-capturing agent: 100g magnesium oxide (dried to a moisture content of 0.2%), 35g oleic acid, 8g isooctyl alcohol, and 4g alkylphenol polyoxyethylene ether (NP-4) were added to 600g high-boiling-point aromatic solvent oil and placed in a stirring device. The mixture was heated to 120℃ under stirring at 400r / min and reacted for 4 hours. The temperature was then lowered to 30℃, and 0.8g 2,6-di-tert-butyl-p-cresol was added. The mixture was ultrasonically dispersed at 100W for 2 hours to obtain magnesium-based vanadium-capturing agent.

[0028] (2) Preparation of rare earth-based vanadium-capturing agent: 100g of lanthanum oxide (crushed to 100 mesh and dried to a moisture content of 0.2%), 60g of ethyl palmitate, 6g of propylene glycol monotetradecyl ether, and 4g of sorbitan monostearate (Span-60) were added to 500g of high-boiling-point aromatic solvent oil and placed in a stirring device. The mixture was heated to 100℃ under stirring at 400r / min and reacted for 4 hours. The temperature was then lowered to 30℃, and 0.8g of 2,6-di-tert-butyl-p-cresol was added. The mixture was sheared and dispersed at 1000r / min for 2 hours to obtain the lanthanum-based vanadium-capturing agent.

[0029] (3) Preparation of vanadium scavenging agent by compounding: Mix the two single agents at a mass ratio of 1:1, stir at 200r / min for 60min, stir at 30℃, let stand for 10min, remove trace precipitates, and obtain a highly stable oil-soluble vanadium scavenging agent.

[0030] The vanadium scavenger prepared in this embodiment is a pale yellow, homogeneous, oily liquid that shows no stratification or deterioration after being stored at room temperature in a sealed container for 6 months. Example 3

[0031] A method for preparing a highly stable oil-soluble vanadium scavenger includes the following steps: (1) Preparation of alkaline earth-based vanadium-capturing agent: 100g magnesium hydroxide (dried to a moisture content of 0.2%), 8g isooctanoic acid and 27g oleic acid, 4g dodecanol and 4g isooctanoic acid, 2g polyisobutylene succinimide (T154) and 2g alkylphenol polyoxyethylene ether (NP-4) were added to 600g white oil and placed in a stirring device. The mixture was heated to 180℃ under stirring at 600r / min and reacted for 2 hours. The temperature was then lowered to 50℃, and 1g 2,6-di-tert-butyl-p-cresol was added. The mixture was ultrasonically dispersed at 200W for 1 hour to obtain magnesium-based vanadium-capturing agent.

[0032] (2) Preparation of rare earth-based vanadium-capturing agent: 100g of neodymium oxide (crushed to 200 mesh and dried to a moisture content of 0.4%), 10g of methyl stearate, 30g of ethyl palmitate, 3g of ethylene glycol monododecyl ether, 3g of propylene glycol monotetradecyl ether, 2g of polyoxyethylene polyoxypropylene block copolymer (F68) and 2g of sorbitan monostearate (Span-60) were added to 500g of white oil and placed in a stirring device. The mixture was heated to 150℃ under stirring at 600r / min and reacted for 2 hours. The temperature was then lowered to 50℃, and 1.2g of 2,6-di-tert-butyl-p-cresol was added. The mixture was sheared and dispersed at 2000r / min for 1 hour to obtain the neodymium-based vanadium-capturing agent.

[0033] (3) Preparation of vanadium scavenging agent by compounding: Mix the two single agents at a mass ratio of 3:1, stir at 500 r / min for 30 min, stir at 50℃, let stand for 20 min, remove trace precipitates, and obtain a highly stable oil-soluble vanadium scavenging agent.

[0034] The vanadium scavenger prepared in this embodiment is a pale yellow, homogeneous, oily liquid that showed no stratification or deterioration after being stored at room temperature in a sealed container for 8 months. Example 4

[0035] (1) Preparation of alkaline earth-based vanadium-capturing agent: 100g calcium oxide (dried to a moisture content of 0.2%), 6g isooctanoic acid, 30g oleic acid, 8g dodecanol, 4g isooctyl alcohol, 2g polyisobutylene succinimide (T154), and 4g alkylphenol polyoxyethylene ether (NP-4) were added to 600g white oil and placed in a stirring device. The mixture was heated to 150℃ under stirring at 300r / min and reacted for 3 hours. The temperature was then lowered to 40℃, and 2.25g 2,6-di-tert-butyl-p-cresol was added. The mixture was ultrasonically dispersed at 150W for 1.5 hours to obtain the calcium-based vanadium-capturing agent.

[0036] (2) Preparation of rare earth-based vanadium-capturing agent: 100g of cerium oxide (crushed to 150 mesh and dried to a moisture content of 0.3%), 12g of methyl stearate, 20g of ethyl palmitate, 4g of ethylene glycol monododecyl ether, 2g of propylene glycol monotetradecyl ether, 2g of polyoxyethylene polyoxypropylene block copolymer (F68), and 4g of sorbitan monostearate (Span-60) were added to 500g of white oil and placed in a stirring device. The mixture was heated to 120℃ under stirring at 300r / min and reacted for 3 hours. The temperature was then lowered to 40℃, and 1.9g of 2,6-di-tert-butyl-p-cresol was added. The mixture was sheared and dispersed at 1500r / min for 1.5 hours to obtain the cerium-based vanadium-capturing agent.

[0037] (3) Preparation of vanadium scavenging agent by compounding: The two single agents mentioned above are mixed at a mass ratio of 2:1, stirred at 200 r / min for 30 min, stirred at 30℃, and allowed to stand for 10 min to remove trace amounts of precipitate, thus obtaining a highly stable oil-soluble vanadium scavenging agent. The obtained product is a pale yellow, homogeneous oily liquid, which does not separate, precipitate, or deteriorate after being stored at room temperature in a sealed container for 6 months. Example 5

[0038] (1) Preparation of alkaline earth-based vanadium-capturing agent: 100g magnesium oxide (dried to a moisture content of 0.2%), 12g isooctanoic acid, 24g oleic acid, 6g dodecanol, 4g isooctanoic acid, 2g T154, and 2g NP-4 were added to 600g white oil and heated to 150℃ with stirring at 300r / min for 3 hours; the temperature was lowered to 40℃, 0.75g 2,6-di-tert-butyl-p-cresol was added, and the mixture was ultrasonically dispersed at 150W for 1.5 hours to obtain magnesium-based vanadium-capturing agent.

[0039] (2) Preparation of rare earth-based vanadium-capturing agent: 100g of lanthanum oxide (crushed to 150 mesh and dried to a moisture content of 0.3%), 6g of methyl stearate, 20g of ethyl palmitate, 3g of ethylene glycol monododecyl ether, 2g of propylene glycol monotetradecyl ether, 2g of F68, and 2g of Span-60 were added to 500g of white oil and heated to 120℃ with stirring at 300r / min for 3 hours; the temperature was then lowered to 40℃, and 0.6g of 2,6-di-tert-butyl-p-cresol was added and sheared and dispersed at 1500r / min for 1.5 hours to obtain lanthanum-based vanadium-capturing agent.

[0040] (3) Preparation of vanadium scavenging agent by compounding: The two single agents mentioned above are mixed at a mass ratio of 2:1, stirred at 500 r / min for 60 min, stirred at 50℃, and allowed to stand for 20 min to remove trace amounts of precipitate, thus obtaining a highly stable oil-soluble vanadium scavenging agent. The resulting product is a pale yellow, homogeneous oily liquid, which does not separate, precipitate, or deteriorate after being stored at room temperature in a sealed container for 7 months. Example 6

[0041] (1) Preparation of alkaline earth-based vanadium-capturing agent: 100g magnesium oxide (dried to a moisture content of 0.2%), 36g oleic acid, 6g dodecanol, 4g isooctyl alcohol, 1.7g T154 and 2.3g NP-4 were added to 600g white oil and heated to 150℃ with stirring at 300r / min for 3 hours; the temperature was lowered to 40℃ and 0.75g 2,6-di-tert-butyl-p-cresol was added and ultrasonically dispersed at 150W for 1.5 hours to obtain magnesium-based vanadium-capturing agent.

[0042] (2) Preparation of rare earth-based vanadium-capturing agent: 100g of lanthanum oxide (crushed to 150 mesh and dried to a moisture content of 0.3%), 8g of methyl stearate, 18g of ethyl palmitate, 3g of ethylene glycol monododecyl ether, 2g of propylene glycol monotetradecyl ether, 2g of F68, and 2g of Span-60 were added to 500g of white oil and heated to 120℃ with stirring at 300r / min for 3 hours; the temperature was then lowered to 40℃, and 0.6g of 2,6-di-tert-butyl-p-cresol was added and sheared and dispersed at 1500r / min for 1.5 hours to obtain lanthanum-based vanadium-capturing agent.

[0043] (3) Preparation of vanadium scavenging agent by compounding: The two single agents mentioned above are mixed at a mass ratio of 2:1, stirred at 500 r / min for 60 min, stirred at 50℃, and allowed to stand for 20 min to remove trace amounts of precipitate, thus obtaining a highly stable oil-soluble vanadium scavenging agent. The resulting product is a pale yellow, homogeneous oily liquid, which does not separate, precipitate, or deteriorate after being stored at room temperature in a sealed container for 7 months. Comparative Example 1

[0044] A single alkaline earth vanadium scavenger was used, prepared in the same manner as step (1) in Example 1, without any compounding, and all other conditions remained unchanged. Slight stratification occurred after 4 months of sealed storage at room temperature. Comparative Example 2

[0045] A single rare earth-based vanadium scavenger was used, prepared in the same way as step (2) in Example 1, without any compounding, and all other conditions remained unchanged. Particle precipitation occurred after 5 months of sealed storage at room temperature.

[0046] As can be seen from the above examples and comparative examples, the highly stable oil-soluble vanadium scavenger prepared by the present invention, through the reasonable combination of rare earth-based and alkaline earth-based single agents, has better stability than a single vanadium scavenger, and the preparation process is simple, making it suitable for large-scale industrial applications.

[0047] Evaluation Test

[0048] Performance evaluation was conducted using a fixed fluidized bed catalytic cracking evaluation unit. The feedstock was heavy metal residue oil, containing 3.5 ppm nickel and 19.2 ppm vanadium. The blank group received no additives; the control groups were Comparative Examples 1 and 2, with an additive dosage of 40 ppm; and the experimental groups were Examples 1-5, with an additive dosage of 40 ppm. Performance evaluation results are detailed in Tables 1 and 2. Table 1 Performance Evaluation Table of Blank Experiment and Comparative Example

[0049] Table 2 Performance Evaluation Table of Examples

[0050] Examples 1-6, through targeted formulation design, are superior to the comparative and blank examples in terms of product distribution and catalyst activity retention.

[0051] Based on the conversion rate and catalyst activity results, the present invention uses a combination of alkaline earth-based and rare earth-based vanadium-capturing agents, which can play a dual role in achieving efficient passivation of vanadium, and has high stability and long storage period.

Claims

1. A method for preparing a highly stable oil-soluble vanadium scavenger, characterized in that, The process includes the following steps: (1) Adding alkaline earth base, long-chain organic acid, hydrophobic additive and oil-soluble dispersant to an inert oil and heating to react, cooling after the reaction, adding stabilizer 2,6-di-tert-butyl-p-cresol and ultrasonically dispersing to obtain alkaline earth base vanadium catching agent; (2) Adding rare earth oxide, aliphatic carboxylic acid ester, alkoxy alcohol or nonionic dispersant to an inert oil and heating to react, cooling after the reaction, adding stabilizer 2,6-di-tert-butyl-p-cresol and shearing to disperse to obtain rare earth base vanadium catching agent; (3) Mixing the alkaline earth base vanadium catching agent and rare earth base vanadium catching agent obtained in steps (1) and (2), stirring evenly, and letting stand to obtain a highly stable oil-soluble vanadium catching agent.

2. The preparation method according to claim 1, characterized in that, The alkaline earth groups in step (1) include magnesium oxide, magnesium hydroxide, calcium oxide, and calcium hydroxide.

3. The preparation method according to claim 1, characterized in that, In step (1), the long-chain organic acid is one or a mixture of two of isooctanoic acid and oleic acid. When the long-chain organic acid is a mixture of two, the mass ratio of isooctanoic acid to oleic acid is 0.2~0.5:

1. The hydrophobic agent is one or a mixture of two of dodecanol and isooctyl alcohol. When the hydrophobic agent is a mixture of two, the mass ratio of dodecanol to isooctyl alcohol is 1~2:

1. The oil-soluble dispersant is one or a mixture of two of polyisobutylene succinimide and alkylphenol polyoxyethylene ether. When the oil-soluble dispersant is a mixture of two, the mass ratio of polyisobutylene succinimide to alkylphenol polyoxyethylene ether is 0.5~1:

1. The amount of stabilizer added is 0.1~0.3% of the total mass of the system. The system includes alkaline earth base, long-chain organic acid, hydrophobic agent, oil-soluble dispersant and inert oil in a mass ratio of 100:35~36:8~12:4~6:

600.

4. The preparation method according to claim 1, characterized in that, In step (1), the temperature is heated to 120~180℃ and the reaction time is 2-4h; the ultrasonic dispersion temperature is 30~50℃ and the time is 1~2 hours.

5. The preparation method according to claim 1, characterized in that, The inert oils used in steps (1) and (2) are white oils or high-boiling-point aromatic solvent oils.

6. The preparation method according to claim 1, characterized in that, The rare earth oxides in step (2) include cerium oxide, lanthanum oxide and neodymium oxide.

7. The preparation method according to claim 1, characterized in that, In step (2), the aliphatic carboxylic acid ester is one or a mixture of two of methyl stearate or ethyl palmitate. When the aliphatic carboxylic acid ester is a mixture of two, the mass ratio of methyl stearate to ethyl palmitate is 0.3~0.6:1; the alkoxy alcohol is one or a mixture of two of ethylene glycol monododecyl ether or propylene glycol monotetradecyl ether. When the alkoxy alcohol is a mixture of two, the mass ratio of ethylene glycol monododecyl ether to propylene glycol monotetradecyl ether is 1~2:1; the nonionic dispersant is polyoxyethylene polyoxypropylene. The nonionic dispersant is one or a mixture of two of the following: olefin block copolymers or sorbitan monostearate. When the nonionic dispersant is a mixture of two, the mass ratio of the polyoxyethylene polyoxypropylene block copolymer to the sorbitan monostearate is 0.5 to 1:

1. The amount of stabilizer added is 0.1 to 0.3% of the total mass of the system. The system includes rare earth oxides, aliphatic carboxylic acid esters, alkoxy alcohols, nonionic dispersants, and inert oils in a mass ratio of 100:26 to 60:5 to 6:4 to 6:

500.

8. The preparation method according to claim 1, characterized in that, In step (2), the temperature is heated to 100~150℃ and the reaction time is 2-4h; the temperature for shear dispersion is controlled at 30~50℃ and the time is 1~2 hours.

9. The preparation method according to claim 1, characterized in that, In step (3), the alkaline earth-based vanadium ore trapping agent and the rare earth-based vanadium ore trapping agent are mixed in a mass ratio of 1 to 3:

1. The stirring speed is 200 to 500 r / min, the stirring time is 30 to 60 min, the stirring temperature is 30 to 50 °C, and after stirring evenly, the mixture is allowed to stand for 10 to 20 min to obtain a highly stable oil-soluble vanadium ore trapping agent.

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