An organic molybdenum salt, a preparation method and application thereof

Abstract

The application relates to the technical field of petroleum chemical industry, and discloses an organic molybdenum salt, a preparation method and application thereof, the preparation method comprising the following steps: (1) preheating treatment is conducted on a hexavalent molybdenum source compound and an alkaline substance in the presence of a solvent to obtain a mixture I with a temperature of 50-100 DEG C; preheating treatment is conducted on a ligand raw material to obtain a mixture II with a temperature of 50-100 DEG C; (2) the mixture I is added dropwise into the mixture II to conduct a mixing reaction, and a mixture III is obtained; (3) the mixture III is subjected to a reduction reaction to obtain the organic molybdenum salt. The preparation method provided by the application can obtain the organic molybdenum salt with high metal content, good oil solubility and excellent anti-coking performance, so that the residue oil hydrogenation process is improved; and the organic molybdenum salt can be applied in a poor heavy oil hydrocracking reaction.

Description

Technical Field

[0001] This invention relates to the field of petrochemical technology, specifically to an organic molybdenum salt, its preparation method, and its application. Background Technology

[0002] As oil extraction depths increase, the crude oil extracted from oil fields is becoming increasingly heavy and of lower quality. This type of crude oil contains high levels of sulfur, nitrogen, and metals, and has a high carbon residue, making it difficult to meet the demand for light oil products. Conventional fixed-bed hydrotreating and catalytic cracking units cannot effectively solve this problem. Slurry bed hydrotreating, however, offers better adaptability to feedstocks, can process low-quality feedstocks with high sulfur, high metal, and high carbon residue, and boasts advantages such as high residue-to-oil conversion rates and flexible operation, making it a promising technology with excellent development prospects.

[0003] The key to slurry-bed residue hydrotreating technology is to suppress coking, thereby improving the economics of unit operation, maintaining long-term unit operation, and reducing hydrogen and catalyst consumption, thus lowering the overall investment in the unit. One way to suppress coking is to use highly active and highly dispersed catalysts for enhanced hydrotreating, thereby promoting the conversion of asphaltenes in the residue into light components.

[0004] Based on solubility and state, slurry bed residue hydrotreating catalysts are classified into inorganic powder catalysts, water-soluble catalysts, and oil-soluble catalysts. Among them, oil-soluble catalysts can be effectively dissolved in heavy feedstocks, exhibit excellent hydrotreating performance, and effectively suppress coking, making them ideal catalysts. However, their low production efficiency and high cost due to complex production processes are pain points that limit the application of oil-soluble catalysts.

[0005] CN112745353A discloses a method for preparing an oil-soluble molybdate complex. This process involves refluxing a mixture of octanoic acid, molybdate, and ethylbenzene in an oil bath for 48 hours, followed by filtration of unreacted raw materials to obtain the product, molybdenum octanoate. However, this preparation process is inefficient, with incomplete raw material conversion and a low conversion rate, thus having certain limitations.

[0006] CN1077714A discloses a preparation process for molybdenum naphthenate and its molybdenum-sulfur anti-wear agent. This process involves reacting naphthenic acid with sodium hydroxide to form a sodium naphthenate solution, reacting molybdenum trioxide with sodium hydroxide to form sodium molybdate, and then diluting and stirring the sodium molybdate and sodium naphthenate in the presence of water, petroleum ether, and benzene. Hydrochloric acid is added dropwise to adjust the pH value during the process, resulting in molybdenum naphthenate. However, this preparation process uses large amounts of alkali and acid, and is complex to operate, failing to meet increasingly stringent energy-saving and environmental protection requirements. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide an organic molybdenum salt with high metal content, good oil solubility, and excellent coking performance during the hydrothermal conversion of heavy oil.

[0008] To achieve the above objectives, a first aspect of the present invention provides a method for preparing an organic molybdenum salt, the method comprising:

[0009] (1) In the presence of a solvent, a hexavalent molybdenum source compound is preheated with an alkaline substance to obtain mixture I at a temperature of 50℃-100℃; and

[0010] The ligand raw material was preheated to obtain mixture II at a temperature of 50℃-100℃; the ligand raw material was C6-C. 16 Organic acids and / or C6-C 16 Organic esters;

[0011] (2) Add mixture I dropwise to mixture II to carry out a mixing reaction, thereby obtaining mixture III;

[0012] (3) The mixture III was subjected to a reduction reaction to obtain the organic molybdenum salt.

[0013] A second aspect of the present invention provides an organic molybdenum salt obtained by the preparation method described in the first aspect above.

[0014] A third aspect of the present invention provides the application of the organic molybdenum salt described in the second aspect above in the hydrocracking reaction of inferior heavy oil.

[0015] The present invention provides a method for preparing organic molybdenum salts. This method is simple to operate and produces no special pollutants during the production process. The organic molybdenum salts obtained by this method have high metal content and stable properties.

[0016] The organic molybdenum salt obtained by the technical solution of the present invention, after pre-sulfurization, can be used in the hydrocracking reaction of inferior heavy oil to achieve high conversion rate and high light oil yield, thereby overcoming the problem that inferior heavy oil is difficult to hydrocracking. Detailed Implementation

[0017] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0018] As described above, a first aspect of the present invention provides a method for preparing an organomolybdenum salt, the method comprising:

[0019] (1) In the presence of a solvent, a hexavalent molybdenum source compound is preheated with an alkaline substance to obtain mixture I at a temperature of 50℃-100℃; and

[0020] The ligand raw material was preheated to obtain mixture II at a temperature of 50℃-100℃; the ligand raw material was C6-C. 16 Organic acids and / or C6-C 16 Organic esters;

[0021] (2) Add mixture I dropwise to mixture II to carry out a mixing reaction, thereby obtaining mixture III;

[0022] (3) The mixture III was subjected to a reduction reaction to obtain the organic molybdenum salt.

[0023] To improve the performance of the organic molybdenum salt obtained by the preparation method provided by the present invention, preferably, the hexavalent molybdenum source compound is selected from one or more of molybdic acid, ammonium dimolybdate, ammonium paramolybdate, and molybdenum trioxide.

[0024] Preferably, the weight ratio of the alkaline substance to the hexavalent molybdenum source compound is (0.001-0.1):1.

[0025] Preferably, the alkaline substance is selected from at least one of sodium carbonate, ammonia, triethylamine, n-propylamine, n-butylamine, n-pentylamine, tetramethylethylenediamine, pyridine, and N-methylmorpholine.

[0026] Preferably, the ammonia water is saturated ammonia water.

[0027] Preferably, the weight ratio of the solvent to the hexavalent molybdenum source compound is (1-15):1.

[0028] Preferably, the solvent is selected from at least one of tetrahydrofuran, ethanol, petroleum ether, and water. The inventors have found that the present invention, in this preferred embodiment, can improve reaction process efficiency and increase feed conversion rate.

[0029] Preferably, the ethanol is anhydrous ethanol.

[0030] It should be noted that the solvent added above can be removed after the reaction is completed using methods known to those skilled in the art, such as under normal or reduced pressure. This invention does not have any particular limitations, and those skilled in the art should not understand it as a limitation of this invention.

[0031] Preferably, the C6-C 16The total number of carbon atoms in the organic acid is any integer from 6 to 16, exemplarily 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, and the organic acid contains at least one carboxyl group. The organic acid can be a saturated or unsaturated organic acid.

[0032] Preferably, the ligand raw material is selected from C6-C. 14 At least one of the organic acids.

[0033] Preferably, the C6-C 16 The organic acid is selected from at least one of hexanoic acid, heptanoic acid, 2-propylheptanoic acid, octanoic acid, 2-ethylhexanoic acid, nonanoic acid, 2-phenylpropionic acid, phenylacetic acid, benzoic acid, phthalic acid, isophthalic acid, terephthalic acid, and adipic acid.

[0034] Preferably, the C6-C 16 The total number of carbon atoms in the organic ester is any integer from 6 to 16, exemplarily 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, and the organic ester contains at least one ester group. The organic ester can be a saturated or unsaturated organic ester.

[0035] Preferably, the ligand raw material is selected from C6-C. 14 At least one of the organic esters.

[0036] Preferably, the C6-C 16 The organic ester is selected from at least one of butyl acetate, methyl octanoate, pentyl acetate, pentyl valerate, ethyl butyrate, isoamyl acetate, ethyl heptaate, methyl valerate, pentyl hexanoate, ethyl octanoate, and ethyl valerate.

[0037] Preferably, the molar ratio of mixture I, based on the hexavalent molybdenum source compound, to mixture II, based on the ligand raw material, is 1:(1-12).

[0038] Preferably, in step (2), the dropping rate of mixture I is 0.1-10 mL / min relative to 1 mL of mixture II.

[0039] Preferably, in step (2), the dropping rate of mixture I is 0.1-4 mL / min relative to 1 mL of mixture II. The inventors have found that the present invention, under this preferred condition, can effectively control the reaction process and increase the metal content of the product.

[0040] Preferably, the mixing reaction is carried out under stirring at a stirring rate of 100-500 rpm. More preferably, the stirring rate of the mixing reaction is 250-350 rpm.

[0041] Preferably, the mixing reaction temperature is 50℃-100℃, and the mixing time is 3min-90min. More preferably, the mixing reaction temperature is 60℃-80℃, and the mixing time is 10min-60min.

[0042] Preferably, the reduction reaction temperature is 50℃-350℃. More preferably, the reduction reaction temperature is 100℃-280℃.

[0043] Preferably, the reduction reaction takes 2-22 hours. More preferably, the reduction reaction takes 3-17 hours.

[0044] Preferably, the reduction reaction is carried out in the presence of a reducing atmosphere.

[0045] Preferably, the reducing atmosphere is selected from at least one of H2 and CO.

[0046] In a preferred embodiment, the reduction reaction is carried out at a pressure of 101.325 ± 20 kPa.

[0047] According to a preferred embodiment, the preparation method further includes: separating the mixture obtained after the reduction reaction to obtain the organic molybdenum salt.

[0048] In a preferred embodiment, the separation method is vacuum distillation.

[0049] According to a particularly preferred embodiment, the preparation method of the present invention includes the following:

[0050] (1) In the presence of a solvent, a hexavalent molybdenum source compound is preheated with an alkaline substance to obtain a mixture I at a temperature of 50℃-100℃;

[0051] Wherein, the weight ratio of the alkaline substance to the hexavalent molybdenum source compound is (0.01-0.08):1; the weight ratio of the solvent to the hexavalent molybdenum source compound is (1-10):1; and

[0052] The ligand raw material was preheated to obtain mixture II at a temperature of 50℃-100℃; the ligand raw material was C6-C. 16 Organic acids and / or C6-C 16 Organic esters;

[0053] The molar ratio of the mixture I, based on the hexavalent molybdenum source compound, to the mixture II, based on the ligand raw material, is 1:(2-10).

[0054] (2) Add mixture I dropwise to mixture II to carry out a mixing reaction, thereby obtaining mixture III;

[0055] The dropping rate is 0.1-10 mL / min, the stirring speed is 250-350 rpm, the mixing reaction temperature is 60℃-80℃, and the mixing time is 10 min-60 min.

[0056] (3) The mixture III was subjected to a reduction reaction to obtain the organic molybdenum salt;

[0057] The temperature of the reduction reaction is 100℃-280℃; the time of the reduction reaction is 3h-17h.

[0058] The method for preparing organic molybdenum salts provided by this invention is simple, the product has good oil solubility, high metal content, and high conversion rate in the reaction process, requiring no filtration step. Furthermore, the production process is relatively environmentally friendly, with no special pollutant emissions.

[0059] As previously stated, a second aspect of the present invention provides an organic molybdenum salt obtained by the preparation method described in the first aspect.

[0060] The organic molybdenum salt provided by this invention contains molybdenum ions and C6-C atoms bound to the molybdenum ions. 16 An organic anion containing an oxygen atom.

[0061] The organic molybdenum salt provided by this invention has high hydrogenation activity during the hydrogenation reaction process. At the same time, it can effectively prevent free radicals from combining and further generating coke, thus exhibiting outstanding coking suppression performance.

[0062] As previously stated, a third aspect of the present invention provides the application of the organic molybdenum salt described in the second aspect in the hydrocracking reaction of inferior heavy oil.

[0063] The solution of the present invention also has the following specific advantages:

[0064] 1. Compared with the prior art, the inventors found that the yield of gasoline and diesel oil were increased to varying degrees in the hydrogenation reaction of the above-mentioned organic molybdenum salts on residual oil, while the content of toluene insoluble matter was reduced.

[0065] 2. Using the above-mentioned organic molybdenum salt as a catalyst precursor for hydrocracking of residue oil in a slurry bed, the nano-scale catalyst generated after presulfurization can be uniformly dispersed in the residue oil and exists in a highly dispersed monolayer structure.

[0066] 3. In the process of hydrogenation of slurry bed residue oil, the amount of the above-mentioned organic molybdenum salt as a catalyst precursor is small. Therefore, the unconverted tail oil after the reaction contains less solid powder and can be directly used as feed for coking unit, or added to asphalt, or the metallic molybdenum can be recovered by recycling waste catalyst.

[0067] The present invention will be described in detail below by way of examples, but this does not mean that the present invention is limited in any way.

[0068] In the following examples, the metal content of the products was determined by inductively coupled plasma atomic emission spectrometry (GB / T17476); unless otherwise specified, all raw materials used were products of Sinopharm Chemical Reagent Co., Ltd.

[0069] Ammonium molybdate, analytical grade; purchased from Sinopharm Chemical Reagent Company.

[0070] Ethylhexanoic acid, analytical grade; purchased from Sinopharm Chemical Reagent Company;

[0071] Caprylic acid, analytical grade; purchased from Sinopharm Chemical Reagent Company.

[0072] The concentration of ethanol is 95 vol%.

[0073] The diesel fuel is No. 0 diesel.

[0074] In the following examples, unless otherwise specified, the mass ratios are all based on the total mass of the substance as a solution, powder, or solid.

[0075] The inductively coupled plasma atomic emission spectrometer (ICP-AES), purchased from Thermo Fisher Scientific, model iCAP, was used. TM PRO ICP-OES.

[0076] The gas chromatograph was purchased from Jetto Scientific Instruments Co., Ltd., model number: GC1620.

[0077] It should be noted that in the following test examples, the organic molybdenum salt to be tested was first pre-sulfurized with sulfur powder, then subjected to hydrogenation to obtain the final product. Finally, the distribution of the final product was determined using gas chromatography. The pre-sulfurization conditions were: a mass ratio of organic molybdenum salt to sulfur powder of 0.21:1, and a reaction temperature of 200℃; the hydrogenation reaction conditions were: a reaction temperature of 420℃, a reaction pressure of 20 MPa, and a reaction time of 6 h.

[0078] The atmospheric pressure is 101.325±20 kPa.

[0079] The method for determining the distribution of the final product using gas chromatography is the standard test method for determining the boiling range distribution of crude oil by gas chromatography (analytical method ASTM D5307).

[0080] Preparation Example 1

[0081] Prepare organic molybdenum salts according to the following steps:

[0082] S1: The hexavalent molybdenum source compound is dissolved and dispersed in a flask with a solvent, and then preheated after adding an alkaline substance to obtain mixture I;

[0083] Among them, the hexavalent molybdenum source compound is ammonium molybdate, the amount added is 50g, the solvent is water, the alkaline substance is saturated ammonia water, and the ammonium molybdate:water:saturated ammonia water is added in a weight ratio of 1:2:0.02, and the preheating temperature is 60℃;

[0084] Then, the ligand raw material is preheated to 60°C to obtain mixture II; wherein, the ligand raw material is 2-ethylhexanoic acid;

[0085] S2: Add mixture I dropwise to mixture II and stir continuously to carry out the mixing reaction, to obtain mixture III;

[0086] The molar ratio of mixture I (calculated as ammonium molybdate) to mixture II (calculated as 2-ethylhexanoic acid) is 1:4, the mixing reaction time is 30 min, the mixing reaction temperature is 60 °C, the dropping rate of mixture I relative to 1 mL of mixture II is 1 mL / min, and the stirring speed is 300 rpm.

[0087] S3: After the reaction is completed, under the reducing atmosphere of H2 and at atmospheric pressure, mixture III is heated to carry out the reduction reaction. Finally, the product is collected by vacuum distillation to obtain organic molybdenum salt. The obtained product is dissolved in diesel to obtain a mixture. The solubility of the product in diesel is shown in Table 1.

[0088] In the reduction reaction in S3, mixture III is heated to 220°C and the reduction reaction is carried out for 6 hours.

[0089] The metal content of the product obtained in this preparation example was analyzed by inductively coupled plasma atomic emission spectrometry (GB / T17476), as shown in Table 1. The results showed that the molybdenum content in the product of this preparation example was 19.7 wt%.

[0090] Preparation Example 2

[0091] Prepare organic molybdenum salts according to the following steps:

[0092] S1: The hexavalent molybdenum source compound is dissolved and dispersed in a flask with a solvent, and then preheated after adding an alkaline substance to obtain mixture I;

[0093] Among them, the hexavalent molybdenum source compound is ammonium molybdate, the amount added is 50g, the solvent is water and ethanol, the alkaline substance is triethylamine, and the ammonium molybdate:water:ethanol:triethylamine is added in a weight ratio of 1:1:1:0.05, and the preheating temperature is 80℃;

[0094] Then, the ligand raw material was preheated to 80°C to obtain mixture II; the ligand raw material was octanoic acid.

[0095] S2: Add mixture I dropwise to mixture II and stir continuously to carry out the mixing reaction, to obtain mixture III;

[0096] The molar ratio of mixture I (calculated as ammonium molybdate) to mixture II (calculated as octanoic acid) is 1:4, the mixing reaction time is 15 min, the mixing reaction temperature is 80 °C, the dropping rate of mixture I relative to 1 mL of mixture II is 1 mL / min, and the stirring speed is 300 rpm.

[0097] S3: After the reaction is completed, under the reducing atmosphere of H2 and at atmospheric pressure, mixture III is heated to carry out the reduction reaction. Finally, the product is collected by vacuum distillation to obtain organic molybdenum salt. The obtained product is dissolved in diesel to obtain a mixture. The solubility of the product in diesel is shown in Table 1.

[0098] In the reduction reaction of S3, mixture III was heated to 230°C and the reduction reaction was carried out for 4 hours.

[0099] The metal content of the product obtained in this preparation example was analyzed by inductively coupled plasma atomic emission spectrometry (GB / T17476), as shown in Table 1. The results showed that the molybdenum content in the product of this preparation example was 16.1 wt%.

[0100] Preparation Example 3

[0101] This preparation example uses a method similar to that of Preparation Example 1, except that in step S2, the dropping rate of mixture I is 5 mL / min relative to 1 mL of mixture II. The obtained product is dissolved in diesel oil to obtain a mixture, and the solubility of the product in diesel oil is shown in Table 1.

[0102] The metal content of the product obtained in this preparation example was analyzed by inductively coupled plasma atomic emission spectrometry (GB / T17476), as shown in Table 1. The results showed that the molybdenum content in the product of this preparation example was 14.8 wt%.

[0103] Comparative Example 1

[0104] The method for preparing the organic molybdenum salt in Comparative Example 1 includes: adding 60g of ammonium molybdate, 124g of 2-ethyl-1,3-hexanediol, 250mL of xylene, and 25mL of dimethylformamide to a reactor, and continuously stirring and heating to carry out the mixing reaction for 6 hours at a reaction temperature of 220℃; then cooling, filtering under suction conditions, and then distilling under reduced pressure at a temperature of 170℃ and a pressure of 400Pa to obtain the product organic molybdenum salt; dissolving the obtained product in diesel fuel to obtain a mixture; the solubility of the product in diesel fuel is shown in Table 1.

[0105] The metal content of the product obtained in this comparative example was analyzed by inductively coupled plasma atomic emission spectrometry (GB / T17476), as shown in Table 1. The results showed that the molybdenum content in the product of this comparative example was 11.6 wt%.

[0106] Test Example 1

[0107] The properties of the residue oil used in Test Example 1 are shown in Table 2.

[0108] 350g of residual oil was weighed, and then 180μg / g of the organic molybdenum salt prepared in Preparation Example 1 was added. 0.30g of sulfur powder was then added for pre-sulfurization treatment. The mixture was then subjected to hydrogenation at a reaction temperature of 420℃ and a reaction pressure of 20MPa for 6 hours to obtain the final product P1. The distribution of the final product P1 was determined using the standard test method for determining the boiling range distribution of crude oil by gas chromatography, as shown in Table 3.

[0109] Test Example 2

[0110] The properties of the residue oil used in Test Example 2 are shown in Table 2.

[0111] Test Example 2 uses a similar method to Test Example 1, except that the organic molybdenum salt used in Test Example 1 is replaced with the product prepared in Preparation Example 2. The final product is obtained and designated P2.

[0112] The distribution of the final product P2 was determined using gas chromatography, as shown in Table 3.

[0113] Test Example 3

[0114] The properties of the residue oil used in Test Example 3 are shown in Table 2.

[0115] Test Example 3 uses a similar method to Test Example 1, except that the organic molybdenum salt used in Test Example 1 is replaced with the product prepared in Preparation Example 3. The final product is obtained and designated P3.

[0116] The distribution of the final product P3 was determined using gas chromatography, as shown in Table 3.

[0117] Test Example 4

[0118] The properties of the residue oil used in Test Example 4 are shown in Table 2.

[0119] Test Example 4 uses a similar method to Test Example 1, except that the organomolybdenum salt used in Test Example 1 is replaced with the product prepared in Comparative Example 1. The final product is obtained and is designated P4.

[0120] The distribution of the final product P4 was determined using gas chromatography, as shown in Table 3.

[0121] Table 1

[0122]

[0123] Table 2

[0124]

[0125] Table 3

[0126] serial number P1 P2 P3 P4 Gas, wt% 6.98 7.84 8.40 9.57 Gasoline (<180℃), wt% 7.56 7.46 6.62 7.21 Diesel fuel (180-350℃), wt% 19.70 19.06 19.60 17.34 Kerosene (140-240℃), wt% 9.04 8.87 8.87 8.00 Wax oil (350-524℃), wt% 21.93 21.70 21.49 19.84 Slag reduction (>524℃), wt% 28.67 27.99 27.67 28.31 Toluene insoluble matter, wt% 6.12 7.24 7.35 9.73

[0127] The results above show that the present invention can overcome the problems of complex production process and high production cost by synergistically reacting hexavalent molybdenum source compounds with alkaline substances and ligand raw materials, and obtain organic molybdenum salts with high metal content, good oil solubility and excellent coking performance.

[0128] Comparative examples and comparative cases demonstrate that the present invention, using preferred types of solvents and alkaline substances, combined with specific ratios of ligand raw materials, and optimized process steps and parameters, can obtain high-quality organic molybdenum salts. These organic molybdenum salts, after pre-sulfurization, exhibit high conversion rates and high light oil yields in the hydrocracking reaction of low-quality heavy oil.

[0129] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A method for preparing an organic molybdenum salt, characterized in that, The preparation method includes: (1) In the presence of a solvent, a hexavalent molybdenum source compound is preheated with an alkaline substance to obtain mixture I at a temperature of 50℃-100℃; and The ligand raw material was preheated to obtain mixture II at a temperature of 50℃-100℃; the ligand raw material was C6-C. 16 Organic acids and / or C6-C 16 Organic esters; (2) Add the mixture I dropwise to the mixture II to carry out a mixing reaction to obtain the mixture III; the dropping rate of the mixture I is 0.1-4 mL / min relative to 1 mL of the mixture II; (3) The mixture III is subjected to a reduction reaction to obtain the organic molybdenum salt; In step (1), the weight ratio of the alkaline substance to the hexavalent molybdenum source compound is (0.001-0.1):1; In step (1), the weight ratio of the solvent to the hexavalent molybdenum source compound is (1-15):1; In step (2), the molar ratio of mixture I, based on the hexavalent molybdenum source compound, to mixture II, based on the ligand raw material, is 1:(1-12).

2. The preparation method according to claim 1, wherein, In step (1), the hexavalent molybdenum source compound is selected from at least one of molybdic acid, ammonium dimolybdate, ammonium paramolybdate, and molybdenum trioxide.

3. The preparation method according to claim 1 or 2, wherein, The alkaline substance is selected from at least one of sodium carbonate, ammonia, triethylamine, n-propylamine, n-butylamine, n-pentylamine, tetramethylethylenediamine, pyridine, and N-methylmorpholine.

4. The preparation method according to claim 1 or 2, wherein, In step (1), the solvent is selected from at least one of tetrahydrofuran, ethanol, petroleum ether and water.

5. The preparation method according to claim 1 or 2, wherein, In step (1), the C6-C 16 The organic acid is selected from at least one of hexanoic acid, heptanoic acid, 2-propylheptanoic acid, octanoic acid, 2-ethylhexanoic acid, nonanoic acid, 2-phenylpropionic acid, phenylacetic acid, benzoic acid, phthalic acid, isophthalic acid, terephthalic acid, and adipic acid; and / or, In step (1), the C6-C 16 The organic ester is selected from at least one of butyl acetate, methyl octanoate, pentyl acetate, pentyl valerate, ethyl butyrate, isoamyl acetate, ethyl heptaate, methyl valerate, pentyl hexanoate, ethyl octanoate, and ethyl valerate.

6. The preparation method according to claim 1 or 2, wherein, In step (2), the mixing reaction is carried out under stirring at a speed of 100-500 rpm.

7. The preparation method according to claim 1 or 2, wherein, In step (2), the mixing reaction temperature is 50℃-100℃ and the mixing time is 3min-90min.

8. The preparation method according to claim 1 or 2, wherein, In step (3), the temperature of the reduction reaction is 50℃-350℃.

9. The preparation method according to claim 1 or 2, wherein, The reduction reaction takes 2-22 hours.

10. The preparation method according to claim 1 or 2, wherein, In step (3), the preparation method further includes separating the mixture obtained after the reduction reaction to obtain the organic molybdenum salt.

11. The preparation method according to claim 1 or 2, wherein, In step (3), the reduction reaction is carried out in the presence of a reducing atmosphere.

12. The preparation method according to claim 11, wherein, The reducing atmosphere is selected from at least one of H2 and CO.

13. An organic molybdenum salt obtained by the preparation method according to any one of claims 1-12.

14. The application of the organic molybdenum salt according to claim 13 in the hydrocracking reaction of inferior heavy oil.

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