Disclosure of Invention
Aiming at the problems existing in the prior art, the invention aims to provide an oil-soluble organic molybdenum salt composition with high molybdenum content, strong thermal stability, good dispersibility, high hydrogenation catalytic activity on inferior hydrocarbon-containing raw materials and good coke inhibition performance, and a preparation method and application thereof.
The first aspect of the present invention provides an organic molybdenum salt composition comprising molybdenum ions, and an organic anion associated with the molybdenum ions; the content of molybdenum is more than or equal to 18 weight percent based on the element, wherein 10.8 percent is more than or equal to 2.4 percent of Mo 4+≥3.6%,7.2%≥Mo5+≥3.6%,7.2%≥Mo6+.
Further, in the molybdenum salt composition, the organic anion is an organic acid ion, and specifically may be selected from one or more of 2-methylpentanoate, 2-methylheptanoate, 2-ethylheptanoate, 3-ethylheptanoate, 4-ethylheptanoate, 2-methylhexanoate, 2-ethylhexanoate, 2, 5-dimethyloctanate, 7-dimethyloctanate, 4-ethyloctanate, 2-propyloctanate, 4-butylbenzoate, 4-pentylbenzoate, 4-hexylbenzoate, 4-heptylbenzoate, 4-octylbenzoate, 4-nonylbenzoate, phenylbutyrate, phenylvalerate, phenylheptanoate, phenyloctanate, phenylnonanoate, and preferably one or more of 2-methylpentanoate, 2-ethylhexanoate, 4-butylbenzoate, 4-pentylbenzoate, phenylbutyrate and phenyloctanate.
Further, in the molybdenum salt composition, the dynamic viscosity (mu 40) of the organic molybdenum salt composition at 40 ℃ is 60 to 120 mPas; the weight loss temperature (T 50) is not lower than 280 ℃;
Further, in the molybdenum salt composition, the proportion of single-layer MoS 2 wafers in the sulfurized MoS 2 wafers formed by sulfurizing the organic molybdenum salt composition is more than 90%.
In a second aspect, the present invention provides a process for preparing an organomolybdenum salt composition, the process comprising the steps of:
(1) Mixing a molybdenum source, an organic solvent and an organic polymer uniformly to obtain a first material flow;
(2) Introducing a first organic acid and a second organic acid into the first material flow obtained in the step (1), uniformly mixing, adding a reaction promoter, reacting, and separating to obtain the organic molybdenum salt composition.
Further, in the above-mentioned method for preparing an organic molybdenum salt composition, the molybdenum source may be one or more selected from molybdenum halides, molybdenum oxides, molybdenum alkali metal salts, molybdenum ammonium salts, and molybdic acid, and preferably molybdenum ammonium salts and/or molybdic acid. Further, the molybdenum source may be specifically selected from one or more of molybdenum hexafluoride, molybdenum trioxide, potassium molybdate, sodium molybdate, calcium molybdate, ammonium dimolybdate, ammonium tetramolybdate, ammonium heptamolybdate, and molybdic acid.
Further, in the preparation method of the organic molybdenum salt composition, the organic solvent in the step (1) can be one or more of C1-C3 alkylbenzene, C6-C12 linear alkane and C6-C12 cycloalkane. Wherein, the C1-C3 alkylbenzene can be one or more of toluene, ethylbenzene, o-xylene, m-xylene, p-xylene and isopropylbenzene, and is preferably p-xylene and/or isopropylbenzene; the C6-C12 linear alkane can be selected from one or more of n-heptane, n-octane, n-decane, n-nonane and n-dodecane, and is preferably n-octane and/or n-dodecane; the C6-C12 cycloalkane may be one or more selected from cyclohexane, cyclooctane and cyclododecane, preferably cyclohexane and/or cyclooctane.
Further, in the preparation method of the organic molybdenum salt composition, the organic polymer is an amphiphilic polymer prepared by adopting precipitation polymerization and free radical initiation, and the structural formula is shown as formula (1):
(1)
Wherein a, b, c, d is an integer between 20 and 120, and 400 is more than or equal to a+b+c+d is more than or equal to 100;
Further, the preparation method of the organic polymer comprises the following steps: adding acrylamide, sodium styrenesulfonate, methyl methacrylate and isooctyl acrylate into a solvent, uniformly mixing to obtain a material A, heating to a reaction temperature, adding an initiator into the material A for reaction, and finally separating, washing and drying to obtain a polymer.
In the preparation method of the organic polymer, the molar ratio of the four monomers of acrylamide, sodium styrene sulfonate, methyl methacrylate and isooctyl acrylate is (2-6): (1-2): (2-4): (1-2).
In the preparation method of the organic polymer, the solvent is a mixed solution of alcohol and water, and the mass ratio of the alcohol to the water is 4: 6-6: 4, the alcohol can be one or more of methanol, ethanol, propanol and isopropanol, and is preferably ethanol.
In the preparation method of the organic polymer, the total mass fraction of four monomers of acrylamide, sodium styrenesulfonate, methyl methacrylate and isooctyl acrylate in the material A is 4-16%.
In the above method for producing an organic polymer, the reaction temperature is 50 to 75 ℃.
In the preparation method of the organic polymer, the initiator is one or more of 2,2' -azobisisobutylaminidine dihydrochloride (AIBA), azobisisobutyronitrile (AIBN) and dibenzoyl peroxide (BPO), preferably azobisisobutyronitrile, and the use amount of the initiator is 0.2-3% of the total mass of the monomer.
In the above method for producing an organic polymer, the separation may be performed by any of centrifugation, filtration, and the like, the washing may be performed several times, generally 1 to 6 times, with deionized water, and the drying may be performed at 45 to 105 ℃ for 4 to 24 hours.
In the preparation method of the organic polymer, the organic polymer is white or light yellow amphiphilic polymer powder, and the number average molecular weight M n of the amphiphilic polymer is 13000-62000 measured by Gel Permeation Chromatography (GPC).
Further, in the above-mentioned method for producing an organomolybdenum salt composition, the first organic acid is an organic carboxylic acid having a carbon number of from C6 to C11 and containing a branched chain, and specifically may be at least one selected from 2-methylpentanoic acid, 2-methylheptanoic acid, 2-ethylheptanoic acid, 3-ethylheptanoic acid, 4-ethylheptanoic acid, 2-methylhexanoic acid, 2-ethylhexanoic acid, 2-propylhexanoic acid, 2, 5-dimethyloctanoic acid, 7-dimethyloctanoic acid, 4-ethylhexanoic acid, 2-propyloctanoic acid, preferably 2-methylpentanoic acid and/or 2-ethylhexanoic acid.
Further, in the preparation method of the organic molybdenum salt composition, the second organic acid is an organic carboxylic acid containing benzene rings and having a total carbon number of 10-16, wherein the carboxyl group can be directly connected to the benzene rings or can be not directly connected to the benzene rings; when the carboxyl group is on the benzene ring, the second organic acid may be at least one selected from 4-butylbenzoic acid, 4-pentylbenzoic acid, 4-hexylbenzoic acid, 4-heptylbenzoic acid, 4-octylbenzoic acid, 4-nonylbenzoic acid, preferably 4-butylbenzoic acid and/or 4-pentylbenzoic acid; when the carboxyl group is not directly connected with the benzene ring, the second organic acid is phenylalkyl carboxylic acid, and specifically can be at least one of phenylbutyric acid, phenylvaleric acid, phenylheptanoic acid, phenyloctanoic acid and phenylnonanoic acid, and preferably phenylbutyric acid and/or phenyloctanoic acid.
Further, in the preparation method of the organic molybdenum salt composition, the reaction promoter is halogenated alkane, and the halogenated alkane has 6-15 carbon atoms, preferably Cl, br and I; specifically, the solvent may be at least one selected from chlorooctane, bromooctane, iodooctane, 1, 8-diiodooctane, chlorononane, 1, 9-dichlorononane, 1-trichlorononane, bromononane, chlorodecane, 1, 10-dichlorodecane, bromodecane, iododecane, 1, 10-diiododecane, chloroundecane, bromoundecane and iodoundecane, preferably at least one selected from chlorooctane, bromooctane and chlorodecane.
Further, in the preparation method of the organic molybdenum salt composition, the dosages of the molybdenum source, the organic solvent, the first organic acid, the second organic acid, the organic polymer and the reaction promoter are respectively as follows in parts by weight: 100 parts of molybdenum source, 50-800 parts of organic solvent, 175-700 parts of first organic acid, 25-100 parts of second organic acid, 0.1-10 parts of organic polymer and 0.02-2.5 parts of reaction promoter; preferably 100 parts of molybdenum source, 200-600 parts of organic solvent, 262.5-525 parts of first organic acid, 37.5-75 parts of second organic acid, 1-6 parts of organic polymer and 0.2-2 parts of reaction promoter.
Further, in the above-mentioned method for producing an organomolybdenum salt composition, the mixing temperature in the step (1) is 40 to 120 ℃, preferably 60 to 100 ℃.
Further, in the preparation method of the organic molybdenum salt composition, the reaction temperature in the step (2) is 120-300 ℃, preferably 150-250 ℃; the reaction time is 4 to 24 hours, preferably 8 to 20 hours.
Further, in the preparation method of the organic molybdenum salt composition, water generated by the reaction is removed in a reflux manner in the reaction process in the step (2).
Further, in the above-mentioned preparation method of the organic molybdenum salt composition, the separation process in the step (2) is generally that the solid phase is removed by suction filtration, and then the solvent is further distilled off, and the distillation generally includes two steps of suction filtration and distillation, wherein the distillation preferably adopts a reduced pressure distillation mode, the operation pressure of the reduced pressure distillation is 1.3-2.0 KPa, the operation temperature is 120-180 ℃, and the distillation end point can be judged according to the total amount of the residual materials being 250-300 parts.
The third aspect of the invention provides a hydrogenation method for inferior heavy oil, which comprises the steps of contacting the inferior heavy oil with the organic molybdenum salt composition under the condition of hydrogen and carrying out hydrogenation reaction.
Further, in the above-mentioned inferior heavy oil hydrogenation method, the inferior heavy oil may be one or more of heavy distillate oil, atmospheric residuum, vacuum residuum, coal tar, catalytic slurry oil, crude oil, and other raw materials.
Further, in the above-mentioned inferior heavy oil hydrogenation method, the reaction conditions are generally as follows: the reaction pressure is 14-20 MPa, the reaction temperature is 380-420 ℃, and the reaction time is 1-20 h.
Further, in the above-mentioned inferior heavy oil hydrogenation method, the concentration of the organic molybdenum salt composition in the inferior heavy oil is 200-2000 mg/kg
Furthermore, in the above-mentioned inferior heavy oil hydrogenation method, the organic molybdenum salt composition generally needs to be vulcanized before use, and a person skilled in the art can select a proper vulcanization mode according to actual situations and needs.
Further, in the above-mentioned inferior heavy oil hydrogenation method, the reactor used in the hydrogenation reaction may be a slurry bed reactor and/or a suspended bed reactor.
Compared with the prior art, the organic molybdenum salt composition and the preparation method and application thereof have the following advantages:
(1) The organic molybdenum salt composition has the characteristics of high molybdenum content of an active metal component, good dispersibility, good fluidity and good thermal stability. The molybdenum content in the organic molybdenum salt composition obtained by the preparation method is higher than 18%, and the molybdenum content in the organic molybdenum salt composition prepared by the prior art is generally lower than 16%, so that the molybdenum content in the product is obviously improved by the method, and the catalytic activity of the material can be improved when the catalyst is used for the poor heavy oil hydrogenation catalytic material. Meanwhile, the organic molybdenum salt composition prepared by the method has good fluidity, can greatly promote dilution and dispersion in inferior heavy oil, has good thermal stability, is favorable for keeping stable structure before presulfiding, and avoids active metal components from gathering and reducing activity due to premature decomposition in a heating stage of a hydrogenation device in the use process. Solves the technical problems that when the existing organic molybdenum salt product is used, the product is decomposed in advance in the heating stage so as to generate aggregation in the reaction stage, and the hydrogenation activity of the nano-scale catalyst particles is seriously affected.
(2) In the preparation method of the organic molybdenum salt composition, an amphiphilic quaternary copolymer is introduced, wherein acrylamide, sodium styrenesulfonate, methyl methacrylate and isoheptyl acrylate are taken as monomers, and the amphiphilic quaternary copolymer is obtained through precipitation polymerization and free radical initiation. Hydrophilic groups in the copolymer can be adsorbed on the surfaces of molybdenum source particles and are tightly combined with molybdenum, so that the copolymer is highly dispersed in an organic solvent by virtue of an oleophilic organic carbon chain, and thus, the molybdenum is wrapped and fully dispersed in the organic solvent by virtue of an organic polymer, active sites are fully exposed, and under the further promotion of halogenated alkane, the reaction efficiency of an organic ligand and the molybdenum is greatly improved, the molybdenum content in the molybdenum salt composition is improved, and meanwhile, the molybdenum salt composition in a highly dispersed state of molybdenum can be obtained.
(3) In the preparation method of the organic molybdenum salt composition, the first organic acid and the second organic acid are used together as the composite organic ligand of molybdenum, the aromatic ring structure in the second organic acid provides larger steric hindrance, the generation of low-valence molybdenum, especially tetravalent molybdenum, is promoted, and the relative content of molybdenum is improved. Meanwhile, the interaction between the aromatic ring structure in the second organic acid and the inferior heavy oil raw material promotes the miscibility of the organic molybdenum salt composition and the inferior heavy oil raw material. In addition, under the coordination effect of the two ligands, especially the use of the second organic acid obviously improves the heat stability of the organic molybdenum salt composition, and avoids the severe decomposition of the organic molybdenum salt composition before the pre-vulcanization reaction, thereby causing the aggregation of active metal components and the reduction of the catalytic efficiency.
(4) The preparation method of the organic molybdenum salt composition has the characteristics of simple process, high reaction conversion rate, safe and environment-friendly production process, and is beneficial to industrial production and application.
Detailed Description
The following is a further description of the preparation and use of the organomolybdenum salt composition of the invention by way of specific examples, which are not intended to limit the invention.
The molybdenum content of the organic molybdenum salt composition in the embodiment and the comparative example is measured by using an inductively coupled plasma emission spectrometer of the Shimadzu corporation ICPE-9000 full spectrum type; the metal valence state of molybdenum is analyzed by adopting an X-ray photoelectric energy spectrum of Siemens Feishul ESCALAB-250Xi, and the peak area is calculated after the peak separation treatment of the obtained XPS spectrogram to obtain the proportion of molybdenum in different valence states; the dynamic viscosity of the organomolybdenum salt composition product was measured according to ASTM D5018-2018; the thermal stability of the organomolybdenum salt composition product was analyzed using a mertler TGA-2 thermogravimetric analyzer. The morphology of the MoS 2 wafer was characterized by means of a JEM-2200FS type 200kV energy filtered field emission transmission electron microscope (JEOL) from japan electronics corporation.
The dynamic viscosity of the organic molybdenum salt composition in the embodiment and the comparative example is mu 40 at 40 ℃; the temperature corresponding to the weight loss of the organic molybdenum salt composition reaching 50% is T 50; the statistical proportion of single-layer MoS 2 wafers in the transmission electron microscope photo is N 1%
The ratios of materials appearing in all examples and comparative examples below are generally ratios of parts by weight of materials without special emphasis.
Example 1
Preparation of organic Polymer A: adding acrylamide, sodium styrene sulfonate, methyl methacrylate and isooctyl acrylate into an ethanol/water solution (the mass ratio of ethanol to water is 13:11) according to the monomer ratio a:b:c:d=6:1:2:2 to obtain a material A, adding an initiator AIBN (the AIBN dosage is 1.5% of the total mass of the four monomers) into the material A, reacting for 8 hours at 60 ℃, and further carrying out centrifugal separation, washing for 2 times and drying for 22 hours at 55 ℃ to obtain the amphiphilic polymer A, wherein the number average molecular weight M n =17500.
Example 2
Preparation of organic Polymer B: adding acrylamide, sodium styrenesulfonate, methyl methacrylate and isooctyl acrylate into a methanol/water solution (the mass ratio of methanol to water is 4:6) according to a monomer ratio a: B: c: d=2:2:4:1 to obtain a material A, adding an initiator AIBA (the AIBA dosage is 0.2% of the total mass of the four monomers) into the material A, reacting for 24 hours at 50 ℃, and further carrying out centrifugal separation, washing for 3 times and drying for 24 hours at 45 ℃ to obtain an amphiphilic polymer B, wherein the number average molecular weight M n =13000.
Example 3
Preparation of organic Polymer C
Adding acrylamide, sodium styrenesulfonate, methyl methacrylate and isooctyl acrylate into an isopropanol/water solution (the mass ratio of the isopropanol to the water is 6:4) according to a monomer ratio a: b: C: d=2:1:3:2 to obtain a material A, adding an initiator BPO (the using amount of the BPO is 4.5% of the total mass of the four monomers) into the material A, reacting for 4 hours at 75 ℃, and further carrying out centrifugal separation, washing for 1 time and drying for 4 hours at 105 ℃ to obtain an amphiphilic polymer C, wherein the number average molecular weight M n =62000.
Example 4
Preparation of organic Polymer D
Adding acrylamide, sodium styrene sulfonate, methyl methacrylate and isooctyl acrylate into a propanol/water solution (the mass ratio of propanol to water is 1:1) according to a monomer ratio a: b: c: d=5:1:3:1 to obtain a material A, adding an initiator AIBN (the AIBN dosage is 1% of the total mass of the four monomers) into the material A, reacting for 20h at 65 ℃, further centrifugally separating, washing for 4 times, and drying for 8h at 75 ℃ to obtain the amphiphilic polymer D, wherein the number average molecular weight M n =28500.
Example 5
Preparation of organic Polymer E
Adding acrylamide, sodium styrenesulfonate, methyl methacrylate and isooctyl acrylate into an ethanol/water solution (the mass ratio of ethanol to water is 13:12) according to a monomer ratio a:b:c:d=5:2:2 to obtain a material A, adding an initiator AIBA (the AIBA dosage is 2.2% of the total mass of the four monomers) into the material A, reacting at 60 ℃ for 13h, and further carrying out centrifugal separation, washing for 1 time and drying at 95 ℃ for 9.5h to obtain an amphiphilic polymer E, wherein the number average molecular weight M n =30300.
Example 6
Preparation of organic Polymer F
Adding acrylamide, sodium styrenesulfonate, methyl methacrylate and isooctyl acrylate into an ethanol/water solution (the mass ratio of ethanol to water is 12:13) according to a monomer ratio a: b: c: d=2:1:2:1 to obtain a material A, adding an initiator BPO (the using amount of the BPO is 0.8% of the total mass of the four monomers) into the material A, reacting for 15h at 70 ℃, further centrifugally separating, washing for 3 times, and drying for 5.5h at 100 ℃ to obtain an amphiphilic polymer F, wherein the number average molecular weight M n =42600.
Example 7
100 Parts of molybdenum trioxide, 325 parts of n-heptane, 7.5 parts of organic polymer A were thoroughly mixed at 95℃to form a homogeneous suspension. 288 parts of 2-ethylhexanoic acid and 48 parts of 4-amyl benzoic acid are then added and uniformly mixed at the same temperature. Adding 1.8 parts of chlorononane into the system, fully and uniformly mixing, heating to 245 ℃, reacting at the temperature for 12.5 hours, stopping the reaction, filtering to remove solid phase, and carrying out reduced pressure distillation at 1.44KPa and 152 ℃ to obtain 273 parts of the total amount of the residual materials, thereby obtaining the oil-soluble organic molybdenum catalyst. The molybdenum content of the organic molybdenum catalyst is 19.8%, wherein the Mo 4+、Mo5+、Mo6+ content is 7.9%, 6.2%, 5.7%, μ 40=90mPa·s,T50=308℃,N1% = 98.2%, respectively.
Example 8
100 Parts of molybdenum hexafluoride, 50 parts of cyclohexane and 0.1 part of the amphiphilic copolymer B are thoroughly mixed at 60℃to form a homogeneous suspension. Then 700 parts of 2-methylheptanoic acid and 75 parts of phenylbutyric acid are added and uniformly mixed at the same temperature. Adding 0.02 part of chlorooctane into the system, fully and uniformly mixing, heating to 150 ℃, reacting at the temperature for 8 hours, stopping the reaction, filtering to remove solid phase, and carrying out reduced pressure distillation at the temperature of 1.3KPa and 120 ℃, wherein the total amount of the rest materials is 250 parts, thus obtaining the oil-soluble organic molybdenum catalyst. The molybdenum content of the organic molybdenum catalyst is 19.6%, wherein the Mo 4+、Mo5+、Mo6+ content is 9.2%, 4.6%, 5.8%, μ 40=105mPa·s,T50=292℃,N1% = 95.6%, respectively.
Example 9
100 Parts of potassium molybdate, 800 parts of toluene and 10 parts of the amphiphilic copolymer C are thoroughly mixed at 40 ℃ to form a uniform suspension system. Then 525 parts of 2-ethylheptanoic acid and 100 parts of phenylheptanoic acid are added and uniformly mixed at the same temperature. Adding 2.5 parts of bromooctane into the system, fully and uniformly mixing, heating to 250 ℃, reacting for 20 hours at the temperature, stopping the reaction, filtering to remove solid phase by suction, and carrying out reduced pressure distillation at 1.6KPa and 146 ℃, wherein the total amount of the rest materials is 300 parts, thus obtaining the oil-soluble organic molybdenum catalyst. The molybdenum content of the organic molybdenum catalyst is 20.4%, wherein the Mo 4+、Mo5+、Mo6+ content is 10.8%, 7.2%, 2.4%, μ 40=120mPa·s,T50=302℃,N1% = 92.9%, respectively.
Example 10
100 Parts of sodium molybdate, 200 parts of n-octane and 1 part of amphiphilic copolymer D are thoroughly mixed at 100 ℃ to form a uniform suspension system. Then 262.5 parts of 2-propylhexanoic acid and 25 parts of 4-hexyl benzoic acid are added and uniformly mixed at the same temperature. Adding 0.2 part of bromodecane into the system, fully and uniformly mixing, heating to 120 ℃, reacting for 24 hours at the temperature, stopping the reaction, filtering to remove solid phase by suction, and carrying out reduced pressure distillation at 2KPa and 180 ℃, wherein the total amount of the rest materials is 285 parts, thus obtaining the oil-soluble organic molybdenum catalyst. The molybdenum content of the organic molybdenum catalyst is 19.2%, wherein the Mo 4+、Mo5+、Mo6+ content is 7.4%, 4.6%, 7.2%, μ 40=60mPa·s,T50=285℃,N1% = 92.5%, respectively.
Example 11
100 Parts of calcium molybdate, 600 parts of n-decane and 6 parts of amphiphilic copolymer E are thoroughly mixed at 120℃to form a homogeneous suspension. Then 175 parts of 2, 5-dimethyl octanoic acid and 37.5 parts of 4-hexyl benzoic acid are added and uniformly mixed at the same temperature. Adding 2 parts of 1, 8-diiodooctane into the system, fully and uniformly mixing, heating to 300 ℃, reacting at the temperature for 4 hours, stopping the reaction, carrying out reduced pressure distillation at 1.4KPa and 162 ℃, and removing solid phase by suction filtration, thereby obtaining the oil-soluble organic molybdenum catalyst. The molybdenum content of the organic molybdenum catalyst is 18.6%, wherein the Mo 4+、Mo5+、Mo6+ content is 7.8%, 3.6%, 7.2%, μ 40=72mPa·s,T50=294℃,N1% = 96.1%, respectively.
Example 12
100 Parts of ammonium heptamolybdate, 220 parts of cumene and 5.5 parts of amphiphilic copolymer F are thoroughly mixed at 112℃to form a homogeneous suspension. Then 182 parts of 7, 7-dimethyl octanoic acid and 72 parts of 4-butyl benzoic acid are added and mixed uniformly at the same temperature. Adding 0.8 part of bromononane into the system, fully and uniformly mixing, heating to 265 ℃, reacting at the temperature for 10 hours, stopping the reaction, filtering to remove solid phase, and carrying out reduced pressure distillation at 1.55KPa and 174 ℃, wherein the total amount of the rest materials is 269 parts, thus obtaining the oil-soluble organic molybdenum catalyst. The molybdenum content of the organic molybdenum catalyst is 19.2%, wherein the Mo 4+、Mo5+、Mo6+ content is 9.9%, 6.9%, 2.4%, μ 40=74mPa·s,T50=299℃,N1% = 95.3%, respectively.
Comparative example 1
100 Parts of molybdenum trioxide, 325 parts of n-heptane and 7.5 parts of the amphiphilic copolymer A were thoroughly mixed at 95℃to form a homogeneous suspension. Then 288 parts of 2-ethylhexanoic acid and 48 parts of 4-amyl benzoic acid are added, uniformly mixed at the same temperature, then the temperature is raised to 245 ℃, the reaction is stopped after the reaction is carried out for 12.5 hours at the temperature, the reduced pressure distillation is carried out at 1.44KPa and 135 ℃, the total amount of the residual materials is 273 parts, and the solid phase is removed by suction filtration, thus obtaining the oil-soluble organic molybdenum catalyst. The molybdenum content of the organic molybdenum catalyst is 13.8%, wherein the Mo 4 +、Mo5+、Mo6+ content is 6.2%, 4.0%, 3.6%, μ 40=49mPa·s,T50=242℃,N1% = 28.2%, respectively.
Comparative example 2
100 Parts of molybdenum trioxide and 325 parts of n-heptane were thoroughly mixed at 95℃to form a homogeneous suspension. 288 parts of 2-ethylhexanoic acid and 48 parts of 4-amyl benzoic acid are then added and uniformly mixed at the same temperature. Adding 1.8 parts of chlorononane into the system, fully and uniformly mixing, heating to 245 ℃, reacting at the temperature for 12.5 hours, stopping the reaction, performing reduced pressure distillation at 1.44KPa and 135 ℃, and filtering to remove solid phase by suction filtration, thereby obtaining the oil-soluble organic molybdenum catalyst. The molybdenum content of the organic molybdenum catalyst is 13.1%, wherein the Mo 4+、Mo5+、Mo6+ content is 6.8%, 3.5%, 2.8%, μ 40=52mPa·s,T50=238℃,N1% = 6.8%, respectively.
Comparative example 3
100 Parts of molybdenum trioxide, 325 parts of n-heptane and 7.5 parts of the amphiphilic copolymer A were thoroughly mixed at 95℃to form a homogeneous suspension. Then 336 parts of 2-ethylhexanoic acid are added and mixed uniformly at the same temperature. Adding 1.8 parts of chlorononane into the system, fully and uniformly mixing, heating to 245 ℃, reacting at the temperature for 12.5 hours, stopping the reaction, performing reduced pressure distillation at 1.44KPa and 135 ℃, and filtering to remove solid phase by suction filtration, thereby obtaining the oil-soluble organic molybdenum catalyst. The molybdenum content of the organic molybdenum catalyst is 13.2%, wherein the Mo 4+、Mo5+、Mo6+ content is 3.6%, 3.8%, 5.8%, μ 40=39mPa·s,T50=236℃,N1% = 16.2%, respectively.
Evaluation of Performance
The performance of the organic molybdenum catalyst of the examples and the comparative examples is evaluated by using straight-run vacuum residuum of a certain factory as a raw material and using a high-pressure reactor. The process conditions are as follows: the reaction pressure is 16MPa, the reaction temperature is 420 ℃, the reaction time is 2.5 hours, the addition amount of the organic molybdenum salt composition is 650mg/kg, and the organic molybdenum salt composition can synchronously complete in-device presulfiding in the heating process due to the higher sulfur content (3.25 wt percent) in the raw oil, and the separate presulfiding operation is not needed.
The properties of the raw materials for reducing slag and the produced oil are shown in Table 1. As can be seen from the table, when the organic molybdenum catalyst described in examples 7-12 is used for processing the raw material for reducing the residue of straight-run distillation, compared with the density and carbon residue value of the raw material, the obtained product oil has reduced 50%, 90% distillation temperature and end point, and simultaneously the saturated component content in the product composition is generally improved, the saturated component content is improved by about 23% at maximum, and the asphaltene content is obviously reduced. The catalyst shows that the organic molybdenum catalyst with high dispersion and good thermal stability has high catalytic activity and strong coke inhibition capability, and is beneficial to the generation of light components. When the organic molybdenum catalyst in comparative examples 1-3 is used for processing the straight-run slag reduction raw material, the oil density of the obtained product is higher, the 50% distillation temperature is higher than that of the products in examples 7-12 by nearly 100 ℃, the saturation fraction in the product is lower than that in examples 7-12 by more than 8%, and the asphaltene yield is obviously improved. This indicates that the comparative sample has poor dispersibility and thermal stability, resulting in lower catalytic activity, lower hydrocracking efficiency of the feedstock, and severe coking during thermal cracking.
TABLE 1 raw materials for straight run slag reduction and oil-forming properties
As shown in the micro-morphology pairs of the catalyst of example 7 and comparative example 2, such as fig. 1 and fig. 2, it can be seen that the MoS 2 wafers formed in the sulfur-containing residual oil by using the organomolybdenum catalyst prepared by the method of example 7 are almost all single-layer wafers, the dispersibility is good, and the active sites are fully exposed; the MoS 2 wafer formed by the organic molybdenum catalyst prepared by the method of comparative example 2 is in a multi-layer stacked shape, has serious aggregation and poor dispersibility, and seriously affects the hydrogenation catalytic activity.