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    • 专利摘要:
    The present invention provides a method and a catalyst for selective oligomerization of ethylene. The raw material for the catalyst consists of a dehydropyridine annulene-type ligand, a 5 transition metal compound, and an organometallic compound in a molar ratio of l:0.5-100:0.1-5000. The present invention also provides a method for selective oligomerization of ethylene accomplished by using the above-mentioned catalyst. The catalyst for selective oligomerization of ethylene of the present invention has high catalytic activity, high selectivity for the target products l-hexene and l-octene, and low selectivity for l-butene and 1-C10+. 10
    公开号:NL2023317A
    申请号:NL2023317
    申请日:2019-06-14
    公开日:2020-01-06
    发明作者:Yu Buwei；Jiang Tao；Wang Sihan；Chu Hongling；Jiang Yan；Huo Hongliang；Xu Xianming；Wang Libo；Shao Huaiqi；Wang Yali；Cao Yuanyuan；Liu Tong；Ma Kecun；Huang Fuling；Wang Xiuhui；Sun Enhao；Wang Yulong
    申请人:Petrochina Co Ltd；
    IPC主号:
    专利说明:

    Technical Field
    The invention relates to a catalyst, in particular to a catalyst for selective oligomerization of ethylene, belonging to the technical field of catalysts.
    Background
    Linear alpha-olefins are important organic chemical materials, and are widely used in the fields of copolymerization to produce polyethylene, surfactants, lubricating oils and oil additives. The light component (C4-C8) can be used as a comonomer to copolymerize with ethylene to produce linear low-density polyethylene. In particular, 1-hexene and 1-octene with high-purity can significantly improve the abrasion resistance and other chemical and mechanical properties of linear low-density polyethylene. As the global economy continues to grow, the demand for polyethylene with high performance continues to grow, and the demand for 1-hexene and 1-octene continues to grow at an average annual rate of 5.4% or more.
    Industrial production methods of 1-hexene and 1-octene mainly include paraffin cracking, ethylene oligomerization and extraction separation, and the ethylene oligomerization method is the main method for producing 1-hexene and 1-octene. For example, US 6184428 discloses a nickel catalyst using a boron compound as a cocatalyst to catalyze the oligomerization of ethylene to give a mixture of linear alpha-olefins, wherein the content of 1-hexene is 22% and the content of 1 -octene is 19%. The SHOP process (US3676523, US3635937) uses a similar catalytic system, and the content of 1-hexene is 21% and the content of 1-octene is 11% in the oligomerization product. In other typical ethylene oligomerization processes, such as Chevron process of Gulf Oil's (DE1443927) and the ethylene oligomerization process of Ethyl Corporation (BP/Amoco, US3906053), the content of 1-hexene and 1-octene is generally 13-25%. In ethylene oligomerization employing the iron-based catalysts reported by Brookhart et al. (J. Am. Chem. Soc., 1998, 120: 7143; Chem. Commun. 1998, 849; WO 99/02472), the content of 1-hexene and 1-octene is also low (<20%). The carbon number of linear alpha-olefins in these production processes is consistent with the Schulz-Flory distribution, which makes the content of 1 -hexene and 1 -octene in the oligomerization product not too high. If 1-hexene and 1-octene with high-purity are to be obtained, it needs to be separated by multi-column distillation, which has a complicated process route and huge equipment investment. Therefore, it is very important to find a production process for preparing 1-hexene and 1-octene with high selectivity.
    Catalyzing high selectivity oligomerization of ethylene is the main method for the production of 1-hexene and 1-octene, wherein the catalyst is its key technology. The development of new catalytic system and study of its catalytic mechanism have been the hotspots and difficult problems in this field. In recent years, researchers have conducted extensive research on ethylene selective oligomerization technology and have achieved many important research results. For example, the chromium catalyst system is used for the trimerization of ethylene to prepare 1 -hexene, and industrial production has also been realized (US5550305, US5198563), but the content of the main product 1-hexene is generally greater than 90%, and the content of 1-octene is very few (<3%).
    Summary of the Inventioin
    An object of the present invention is to provide a catalyst for selective oligomerization of ethylene with high catalyst activity, high selectivity for the target products 1-hexene and 1-octene, and low selectivity for 1-butene and 1-C)O +.
    In order to achieve the above technical object, the present invention provides a catalyst for selective oligomerization of ethylene, and the raw material for the catalyst consists of: a dehydropyridine annulene-type ligand, a transition metal compound, and an organometallic compound in a molar ratio of 1:0.5-100:0.1-5000; wherein the dehydropyridine annulene-type ligand has a structural formula as shown in Formula I:
    with R1, R2, and R3 each independently selected from an alkyl group or an aryl group.
    In the catalyst of the present invention, preferably, R1, R2, and R’ in Formula I are independently selected from hydrogen atom, methyl, ethyl, isopropyl, cyclopentyl, cyclohexyl, phenyl, o-methylphenyl, o-ethylphenyl, o-isopropylphenyl, 2,4-dimethylphenyl, 2,4-diethylphenyl, 2,4-diisopropylphenyl, 2,4-dibutylphenyl, 2,6-diisopropylphenyl, 2,6-dimethylphenyl,
    2.6- diethylphenyl, 2,6-dibutylphenyl, 2,4,6-trimethylphenyl, 2,4,6-triethylphenyl,
    2.4.6- triisopropylphenyl, naphthyl, anthryl, and biphenyl.
    More preferably, R1, R2, and R3 are each independently selected from hydrogen atom, methyl, ethyl, isopropyl, phenyl, 2,6-diisopropylphenyl, and naphthyl.
    In the catalyst of the present invention, the dehydropyridine annulene-type ligand used is obtained according to the following reaction formula:
    In the catalyst of the present invention, the dehydropyridine annulene-type ligand is obtained by a palladium-catalyzed cross-coupling reaction and a copper-catalyzed alkyne self-coupling reaction; and the specific preparation steps of the dehydropyridine annulene-type ligand used are as follows:
    Tetrakis(triphenylphosphino)palladium and diethylamine are added to tetrahydrofuran, and the reactant A and the reactant B are successively added therein under stirring, and the mixture is heated under reflux for 12 hours, cooled, and filtered to obtain a solution of the intermediate C in tetrahydrofuran;
    the tetrabutylammonium fluoride is added to the solution of intermediate C in tetrahydrofuran, stirred for 1 hour, and the solvent is removed; after methylene chloride is added to dissolve the mixture, copper iodide and tetramethylethylenediamine are further added, and the mixture is heated under reflux for 24 hours under air bubbling, and dehydropyridine annulene-type ligand was obtained by filtration, concentration and column chromatography separation.
    In the catalyst of the present invention, preferably, the dehydropyridine annulene-type ligand consists of a plurality of compounds of Formula I. Among them, a plurality of compounds represented by the formula 1 are bonded together by a group, a chemical bond or an intermolecular force or the like. For example, a bridged, dendritic, and star-shaped compound may be obtained, or a polymerized polymer formed by binding to a polymer chain may be obtianed.
    In the catalyst of the present invention, preferably, the transition metal compound used is a compound of metal from Group IV B-VIII.
    In the catalyst of the present invention, preferably, the transition metal compound used is a compound of chromium, molybdenum, tungsten, titanium, cobalt, tantalum, vanadium, zirconium, iron, nickel, or palladium.
    More preferably, the transition metal compound used is a compound of chromium, zirconium, or titanium; more preferably, the transition metal compound is a compound of chromium.
    In the catalyst of the present invention, preferably, the compound of chromium has a general formula of CrR”m, w'herein Rn is an organic anion or a neutral molecule, Rn contains 1-10 carbon atoms, and n is an integer of 1-6.
    More preferably, Rn is an organic compound or a group thereof having a carboxyl group, a β-dione group, or a hydrocarbon group.
    In the catalyst of the present invention, preferably, the compound of chromium used includes one or a combination of more of chromium acetate, chromium isooctanoate, chromium n-octanoate, chromium acetylacetonate, chromium diisoprene, diphenyl chromium, CrCl3(THF)3, CrCLfTHFh, (phenyl)tricarbonylchromium, and hexacarbonylchromium.
    More preferably, the compounds of chromium used is one or a combination of more of CrCl3(THF)3, chromium isooctanoate, and chromium acetylacetonate.
    In the catalyst of the present invention, an organometallic compound acts as an activating agent. Preferably, the organometallic compound used is a compound containing a Group ΠΙΑ metal.
    More preferably, the organometallic compounds used include one or a combination of more of an alkyl aluminum compound, an aluminoxane compound, an organoboron compound, an organic salt, an inorganic acid, and an inorganic salt.
    In the catalyst of the present invention, preferably, the alkyl aluminum compound used includes an alkyl aluminum compound (particularly a trialkyl aluminum compound) and an aluminoxane compound.
    More preferably, the alkyl aluminum compound used is triethyl aluminum, triisobutyl aluminum, tri-n-butyl aluminum, tri-n-hexyl aluminum, or tri-n-octyl aluminum; wherein the aluminoxane compound used is methyl aluminoxane, ethyl aluminoxane, isobutyl aluminoxane, and modified aluminoxane.
    In the catalyst of the present invention, preferably, the molar ratio of the aluminoxane compound to the alkyl aluminum compound is 100-0.01:1, more preferably 10-0.1:1.
    In the catalyst of the present invention, preferably, the alkyl aluminum compound used is alkyl aluminum halide, alkyl aluminum hydride, or alkyl aluminum sesquichloride.
    More preferably, the alkyl aluminum compound used is AlEt2Cl and/or Al2Et3Cl3.
    In the catalyst of the present invention, preferably, the organic salt used is methyl lithium or methyl magnesium bromide.
    In the catalyst of the present invention, preferably, the inorganic acid used is a tetrafluoroboric acid ether complex.
    In the catalyst of the present invention, preferably, the inorganic salt used is tetrafluoroborate or hexafluoroantimonate.
    In the catalyst of the present invention, preferably, the organoboron compound used includes one or a combination of more of boroxine, sodium borohydride, triethyl borane, tris(pentafluorophenyl)boron, and tributylborate.
    The catalyst for selective oligomerization of ethylene of the present invention utilizes the electronic effect of the substituent to adjust the charge distribution at the coordination point through the dehydropyridine annulene-type ligand having conductivity capability, and utilizes an interlayer molecular confinement effect formed by a dehydropyridine annulene-type ligand similar to a planar structure to obtain a catalyst having high activity and high selective ethylene oligomerization. In the existing ethylene selective tetramerization technology, most of the ligand structure uses P atom as an electron donating atom, and the metal center to catalyze selective oligomerization of ethylene, especially catalyzing ethylene tetramerization. Due to the unstable structure of the phosphine ligands, it is easy to decompose under the action of high temperature and alkyl aluminium and aluminoxane, resulting in catalyst variability or inactivation, so that the activity and selectivity of ethylene selective tetramerization are always difficult to achieve a high level. The dehydropyridine annulene-type ligand has a stable macrocyclic structure and can significantly transfer the electronic effect of the substituent group to the coordination hetero atom by conjugation to further enhance the stability of the metal complex and thereby significantly improve the catalytic activity.
    The catalyst for selective oligomerization of ethylene of the present invention has an approximately planar structure of a ligand complexed with a metal compound to directly form a metal complex having a layered structure, and the inter-layer gap can achieve a molecular confinement effect on ethylene polymerization for the selective oligomerization of olefins, especially for the high selective preparation of 1-hexene and 1-octene.
    The present invention also provides a method for selective oligomerization of ethylene using the catalyst for selective oligomerization of ethylene of the present invention.
    In the method of the present invention, preferably, the method is conducted by pre-mixing a dehydropyridine annulene-type ligand, a transition metal compound, and an organometallic compound before use; or directly adding a dehydropyridine annulene-type ligand, a transition metal compound, and an organometallic compound into a selective ethylene oligomerization reaction.
    According to a particular embodiment of the present invention, when the dehydropyridine annulene-type ligand, the transition metal compound and the metal organic compound are premixed, the reaction may be carried out by a liquid phase reaction, such as under an action of a solvent, and solvents such as toluene, benzene and its derivatives can be selected and used; the reaction can be also carried out by a solid phase reaction;
    According to a particular embodiment of the present invention, the dehydropyridine annulene-type ligand, the transition metal compound, and the metal organic compound can also be directly added to catalyze the oligomerization reaction by the in-situ reaction.
    In the method of the present invention, preferably, the method is carried out in an inert solvent; more preferably, the inert solvent used is an alkyl hydrocarbon, anaromatic hydrocarbon, a halogenated hydrocarbon, an olefin, benzene, toluene, xylene, cumene, n-heptane, n-hexane, methylcyclohexane, cyclohexane, 1-hexene, 1-octene, or an ionic liquid.
    In the method of the present invention, preferably, the method has a reaction temperature of from 0 °C to 200 °C and a reaction pressure of from 0.1 MPa to 50 MPa.
    More preferably, the method has a reaction temperature of the method of from 50 °C to 200 °C.
    According to a particular embodiment of the present invention, the reaction conditions of the selective oligomerization reaction of ethylene of the present invention can be adjusted according to a specific reaction, for example, the pressure for the ethylene tetramerization reaction is from 0.1 MPa to 50 MPa, preferably from 1.0 MPa to 10 MPa.
    In the method of the present invention, preferably, the concentration of the catalyst for selective oligomerization of ethylene of the present invention in the selective oligomerization reaction of ethylene is from 0.01 mol metal/L to 1000 mol metal/L, preferably 0.1 mol metal/L to 10 mol metal/L.
    The catalyst for selective oligomerization of ethylene of the present invention can be used to catalyze the selective oligomerization reaction of ethylene; in particular, to catalyze selective trimerization and tetramerization reaction of ethylene.
    When the catalyst for selective oligomerization of ethylene of the present invention can be used to catalyze the selective oligomerization reaction of ethylene, the reaction temperature is from 0 °C to 200 °C, and the reaction pressure is from 0.1 MPa to 50 MPa; preferably, the reaction temperature is from 50 °C to 200 °C. The adjustment can be carried out according to the specific reaction. For example, the pressure of the ethylene tetramerization reaction is from 0.1 MPa to 50 MPa, preferably from 1.0 MPa to 10 MPa.
    The concentration of the catalyst for selective oligomerization of ethylene of the present invention in the selective oligomerization reaction of ethylene is from 0.01 mol metal/L to 1000 mol metal/L, preferably 0.1 mol metal/L to 10 mol metal/L.
    The catalyst for selective oligomerization of ethylene of the present invention has high activity, high selectivity of the target products 1-hexene and 1-octene, and low selectivity of 1-hutene and l-C10+.
    The catalyst for selective oligomerization of ethylene of the present invention has simple synthesis, low cost and long catalyst life, and the mass percentage of C6-C8 linear alpha-olefin in the product is >90%, and the mass percentage of C8 linear alpha-olefin is >60%.
    Detailed Description
    The technical solutions of the present invention are described in detail below in order to have a clearer understanding of the technical features, objectives and beneficial effects of the present invention, but it is not to be construed as limiting the scope of the invention.
    Example 1
    Firstly, this example provides a dehydropyridine annulene ligand LI (C^HsoNi) which is prepared by the following steps.
    Ph Ph
    LI
    0.12 g (0.1 mmol) of tetrakis(triphenylphosphino)palladium, 0.76 g (10.5 mmol) of diethylamine, 1.41 g (10.0 mmol) of 4-methyl-2,6-diacetylenylpyridine and 4.67 g (10.0 mmol) of l,l-diphenyl-4-(triethylsilyl)-l-butene-3-yn-2-yl trifluoromethanesulfonate were successively added to 100 mL of tetrahydrofuran, stirred under reflux for 12 hours. The mixture is cooled, filtered to obtain a solution of the cross-coupling product in tetrahydrofuran.
    Without separation and purification, 20 mL of undehydrated tetrabutylammonium fluoride saturated tetrahydrofuran solution was added to the above solution. After stirring at room temperature for 1 hour, the solvent was removed, and 100 mL of dichloromethane was added to dissolve the mixutre, then 0.04 g (0.2 mmol) of copper iodide and 0.023 g (0.2 mmol) of tetramethylethylenediamine were added thereto, and the mixture was stirred under reflux for 24 hours. After finally filtering and concentrating, it was separated by n-hexane column chromatography to obtain 4.80 g (8.8 mmol, yield: 88.3%) of ligand LI.
    This example also provides a catalyst for selective oligomerization of ethylene which is prepared by the following step:
    Dehydrated methylcyclohexane (20 mL), DMAO (methylaluminoxane with trimethylaluminum removed) (0.57 g, 9.9 mmol), triethylaluminum (0.38 g, 3.3 mmol), ligand LI (81 mg, 67.8 mol), CrCl3-(THF)3 (12 mg, 33 mol) were added to a 100 mL reactor equipped with stirrer with sufficient N2 substitution, and the system was reacted at room temperature for 5 min for preparation.
    The above-mentioned catalyst for selective oligomerization of ethylene of the present example is used for catalyzing ethylene oligomerization, and the specific steps are as follows:
    The 500 mL autoclave was heated to a vacuum for 2 hours, replaced with nitrogen several rounds and charged with ethylene, cooled to a predetermined temperature, and the dehydrated methylcyclohexane (200 mL) and the above catalyst were added.
    The oligomerization reaction was carried out at 45 ° C and a pressure of 1 MPa. After 30 min of reaction, it was cooled in an ice bath, and the pressure was released. The reaction was terminated with an acidified ethanol having a mass fraction of 10% to obtain an oligomerized product of 61.1 g, and a catalyst activity being 3.7X106 g. oligomer/mol Cr-h. The distribution of oligomerized products is shown in Table 1.
    Example 2
    This Example was processed in a manner similar to Example 1, except that Ri is -H. The oligomerized product obtained is 44.68 g, and the catalyst activity was 2.9xl06 g oligomer/mol Cr-h. The distribution of oligomerized products is shown in Table 1.
    Example 3
    This Example was processed in a manner similar to Example 1, except that R2, R3 are methyl groups. The oligomerized product obtained is 84.15 g, and the catalyst activity is 5.1xl0ftg oligomer/mol Cr-h. The distribution of oligomerized products is shown in Table 1.
    Example 4
    This Example was processed in a manner similar to Example 1, except that R2, R3 are naphthyl groups. The oligomerized product obtained is 36.2 g, and the catalyst activity is 2.2xl06g oligomer/mol Cr-h. The distribution of oligomerized products is shown in Table 1.
    Example 5
    This Example was processed in a manner similar to Example 2, except that R2, R;> are isopropyl groups. The oligomerized product obtained is 103.95 g, and the catalyst activity is 6.3xl06g oligomer/mol Cr-h. The distribution of oligomerized products is shown in Table 1.
    Example 6
    This Example was processed in a manner similar to Example 5, except that Rj is isopropyl group. The oligomerized product obtained is 115.5 g, and the catalyst activity is 7.0x106g oligomer/mol Cr-h. The distribution of oligomerized products is shown in Table 1.
    Example 7
    This Example was processed in a manner similar to Example 2, except that R2, R3 are 2,6-diisopropylphenyl groups. The oligomerized product obtained is 100.65 g, and the catalyst activity is 6.1xl06g oligomer/mol Cr-h. The distribution of oligomerized products is shown in Table 1.
    Example 8
    This Example was processed in a manner similar to Example 2, except that the pressure of ethylene is 2 MPa. The oligomerized product obtained is 77.55 g, and the catalyst activity is 4.7xl06g oligomer/mol Cr-h. The distribution of oligomerized products is shown in Table 1.
    Example 9
    This Example was processed in a manner similar to Example 2, except that the pressure of ethylene is 4 MPa. The oligomerized product obtained is 120.45 g, and the catalyst activity is 7.3xl0°g oligomer/mol Cr-h. The distribution of oligomerized products is shown in Table 1.
    Example 10
    This Example was processed in a manner similar to Example 2, except that the reaction temperature is 0 °C. The oligomerized product obtained is 19.8 g, and the catalyst activity is 1.2x106g oligomer/mol Cr- .h. The distribution of oligomerized products is shown in Table I.
    Example 11
    This Example was processed in a manner similar to Example 2, except that the reaction temperature is 90 °C. The oligomerized product obtained is 72.6g, and the catalyst activity is 4.4xI0ög oligomer/mol Cr-h. The distribution of oligomerized products is shown in Table 1.
    Example 12
    This Example was processed in a manner similar to Example 2, except that the amount of CrCl3-(THF)3 is 3pmol. The oligomerized product obtained is 21.3 g and the catalyst activity is 14.2xl06g oligomer/mol Cr.-h. The distribution of oligomerized products is shown in Table 1.
    Example 13
    This Example was processed in a manner similar to Example 9, except that the cocatalyst is MMAO. The oligomerized product obtained is 59.4 g and the catalyst activity is 3.6xl06g oligomer/mol Cr.-h. The distribution of oligomerized products is shown in Table 1.
    Example 14
    This Example was processed in a manner similar to Example 9, except that the cocatalyst is MAO. The oligomerized product obtained is 46.2 g, and the catalyst activity is 2.8x106g oligomer/mol Cr.-h. The distribution of oligomerized products is shown in Table 1.
    Example 15
    This Example was processed in a manner similar to Example 9, except that the chromium compound is CrCLlTHFE. The oligomerized product obtained is 18.2 g, and the catalyst activity is l.lxl06g oligomer/mol Crh. The distribution of oligomerized products is shown in Table 1.
    Table 1. Comparison of carbon number distribution of oligomerization products
    Carbon number distribution of productsC4(Wt%)C6(wt%)Cg(wt%)>Cjo(wt%)Content of 1 -C6a(wt%)Content of 1-C8 b(wl%)Example 15.4438.2555.291.0292.3195.21Example 24.5434.5759.541.3590.2296.51Example 34.0134.0159.842.1491.0394.57Example 46.3537.3552.573.7394.2195.68Example 56.3737.2454.322.0789.3297.51Example 63.0335.6859.721.5788.2196.32Example 78.2533.2455.852.6695.1497.01Example 82.0433.4163.570.9885.1296.34Example 93.2422.7672.581.4282.0195.14Example 102.5727.6268.541.2783.2594.57Example 114.6869.5723.702.0597.6593.67Example 122.5437.8756.353.2492.5496.57Example 133.6534.5757.764.0291.4796.08Example 141.1736.7859.662.3997.3897.51Example 157.3542.6948.191.7793.6595.88
    In Table 1, a means the percentage content of 1 -C6= in C6, and b means the percentage content of 1-C8= in C8. C6=, C8= represents an olefin having a double bond at its end.
    Table 2 shows the experimental conditions and catalyst activities of Example 1 to Example 15, wherein (a) is a dehydropyridine annulene-type ligand, (b) is a transition metal compound, and (c) is 10 an organometallic compound.
    Table 2
    ExampleR1 R2 R3 CocatalystChromium compoundReactiontemperature(°C)Reaction pressure(MPa)Catalyst concentration (mmol Cr/L)(a)Added amount μιηοΐ(b)Added amount μιηοΐ(c)AddedamountmmolCatalyst activity io6g oligomer/molCrh1MethylPhenylPhenylDMAÖ/Et3AÏCrCI•(THF)3 ...........45...........10.1667.8......33......9.9/3.3............3.7.............2HPhenylPhenylDMAÖ/Et3AÏCrCI•(thf)3 ...........45...........10.1667.8......33......9.9/3.32.93MethylMethylMethylDMAO/Et3AlCrCI;•(THF)3 4510.1667.8339.9/3.35.14MethylNaphthylNaphthylDMAO/Et3AlCrCI;•(THF)3 4510.1667.8339.9/3.32.25-HIsopropylIsopropylDMAO/Et3AlCrCI;•(THF)3 4510.1667.8339.9/3.36.36IsopropylIsopropylIsopropylDMAO/Et3AlCrCI;•(THF)3 4510.1667.8339.9/3.37.07-H2,6-Diisopropyl-phenyl2,6-Diisopropyl-phenylDMAO/Et3AlCrCI•(THF)3 4510.1667.8339.9/3.36.!.........8.........HPhenylPhenylDMAO/Et3AlCrCI•(THF)3 45.........2.........0.1667.8......33......9.9/3.3............4.7.............9HPhenylPhenylDMAÖ/Et3AÏCrCI•(THF)3 ...........45....................4.........0.1667.8......33......9.9/3.3............7.3.............10HPhenylPhenylDMAÖ/Et3AÏCrCI•(THF)3 .............o............10.1667.8......33......9.9/3.3............L2.............11HPhenylPhenylDMAÖ/Et3AÏCrCI•(THF)3 ...........9010.1667.8......33......9.9/3.3............4.4.............12HPhenylPhenylDMAÖ/Et3AÏCrCI;•(THF)3 ...........45...........10.0156........3.......0.9/0.3...........1 4.2...........13-HPhenylPhenylMMAOCrCI;•(THF)3 4540.1667.8339.9/3.33.614-HPhenylPhenylMAOCrCI;•(THF)3 4540.01567.83313.22.815-HPhenylPhenylDMAO/Et3AlCrCI;•(THF)2 4510.1667.8331.11.1
    The above examples demonstrate that the catalyst for selective oligomerization of ethylene of the present invention has high activity, high selectivity of the target products 1-hexene and 1 -octene, and low yield of 1-butene and 1-Ciq+.
    权利要求:
    Claims (16)
    [1]
    Conclusions
    A catalyst for selective oligomerization of ethylene, characterized in that the raw material for the catalyst consists of: a dehydropyridine-cancellan-type ligand, a transition metal compound, and an organometallic compound in a molar ratio of 1: 0.5-100: 0 , 1-5000; wherein the dehydropyridine-cancellan-type ligand has a structural formula as shown in Formula I:

    [2]
    A catalyst according to claim 1, characterized in that R 1 , R 2 , R 3 are independently selected from hydrogen atom, methyl, ethyl, isopropyl, cyclopentyl, cyclohexyl, phenyl, o-methylphenyl, oethylphenyl, o-isopropylphenyl, 2, 4-dimethylphenyl, 2,4-diethylphenyl, 2,4-diisopropylphenyl, 2,4dibutylphenyl, 2,6-diisopropylphenyl, 2,6-dimethylphenyl, 2,6-diethylphenyl, 2,6-dibutylphenyl, 2,4,6-trimethylphenyl, 2,4,6-triethylphenyl, 2,4,6-triisopropylphenyl, naphthyl, anthryl and biphenyl; preferably, R 1, R 2 , R 3 are independently selected from hydrogen atom, methyl, ethyl, isopropyl, phenyl, 2,6 diisopropyl phenyl and naphthyl.
    [3]
    Catalyst according to claim 1, characterized in that the dehydropyridine-cancellan type ligand consists of a plurality of compounds of formula 1.
    [4]
    Catalyst according to claim 1, characterized in that the transition metal compound is a compound of a metal from group IVB-VIII.
    [5]
    A catalyst according to claim 1 or 4, characterized in that the transition metal compound is a compound of chromium, molybdenum, tungsten, titanium, cobalt, tantalum, vanadium, zirconium, iron, nickel or palladium; preferably the transition metal compound is a compound of chromium, zirconium or titanium; more preferably, the transition metal compound is a compound of chromium.
    [6]
    A catalyst according to claim 5, characterized in that the compound of chromium has a general formula of Cr R n m , wherein R n is an organic anion or a neutral molecule, wherein R n comprises carbon atoms, and n is an integer of 1 -6 is; preferably R is an organic compound or a group thereof with a carboxyl group, a β-diketone group or a hydrocarbon group.
    [7]
    Catalyst according to claim 6, characterized in that the compound of chromium is one or a combination of several of chromium acetate, chromium isooctanoate, chromium n-octanoate, chromium acetylacetonate, chromium diisoprene, diphenyl chromium, CrCl 3 (THF) 3 , CrCl 2 (THF) 2 , (phenyl) tricarbonyl chromium and hexacarbonyl chromium; preferably the compound of chromium is one or a combination of several of CrCl 3 (THF) 3 , chromium isooctanoate and chromium acetylacetonate.
    [8]
    A catalyst according to claim 1, characterized in that the organometallic compound is a compound comprising a Group IIIA metal; preferably the organometallic compounds comprise one or a combination of several of an alkylaluminum compound, an aluminoxane compound, an organoboron compound, an organic salt, an inorganic acid and an inorganic salt.
    [9]
    A catalyst according to claim 8, characterized in that the alkylaluminum compound comprises an alkylaluminum compound and an aluminoxane compound; preferably the alkylaluminum compound is triethylaluminum, triisobutylaluminum, tri-n-butylaluminum, tri-nhexylaluminum or tri-n-octylaluminum; wherein the aluminoxane compound is methylaluminoxane, ethylaluminoxane, isobutylaluminoxane and modified aluminoxane; wherein the molar ratio of the aluminoxane compound to the alkylaluminum compound is 100-0.01: 1, preferably 10-0.1: 1.
    [10]
    A catalyst according to claim 8, characterized in that the alkylaluminum compound is alkylaluminum halide, alkylaluminum hydride or alkylaluminum sesquichloride; preferably the alkylaluminum compound used is AlEt 2 Cl and / or AFEtjCK
    [11]
    A catalyst according to claim 8, characterized in that the organic salt is methyl lithium or methyl magnesium bromide; the inorganic acid is preferably a tetrafluoroboric acid ether complex; the inorganic salt is tetrafluoroborate or hexafluoroantimonate; the organoboron compound comprises one or a combination of more boroxin, sodium borohydride, triethyl borane. Iris (pentafluorophenyl) boron and tribulyl borate.
    [12]
    Process for the selective oligomerization of ethylene, characterized in that the process is carried out by using the catalyst according to one of claims 1 to 11.
    [13]
    A method according to claim 12, characterized in that the dehydropyridine-cancellan-type ligand, the transition metal compound and the organometallic compound are pre-mixed before being added to a selective ethylene oligomerization reaction; or the dehydropyridine-canceled type ligand, the transition metal compound and the organometallic compound are added directly to a selective ethylene oligomerization reaction.
    [14]
    A method according to claim 12, characterized in that the method is carried out in an inert solvent; preferably the inert solvent is an alkyl hydrocarbon, an aromatic hydrocarbon, a halogenated hydrocarbon, an olefin, benzene, toluene, xylene, isopropylbenzene, n-heptane, n-hexane, methylcyclohexane, cyclohexane, 1-hexene, 1-octene, or ' an ionic liquid.
    [15]
    Method according to claim 12, characterized in that the method has a reaction temperature of 0 ° C to 200 ° C and a reaction pressure of 0.1 MPa to 50 MPa.
    [16]
    Use of a catalyst according to one of claims 1 to 11, characterized in that the catalyst is used to catalyze a reaction of selective ethylene oligomerization, in particular to catalyze a reaction of selective ethylene trimerization or tetramerization.
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    同族专利:
    公开号 | 公开日
    JP2020001035A|2020-01-09|
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    US20190388882A1|2019-12-26|
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    申请号 | 申请日 | 专利标题
    CN201810648359.8A|CN108686706B|2018-06-22|2018-06-22|Ethylene selective oligomerization method and catalyst|
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