CN107899614B - Binuclear xanthene bridged amido-nickel pyridine catalyst and preparation method and application thereof - Google Patents

Binuclear xanthene bridged amido-nickel pyridine catalyst and preparation method and application thereof Download PDF

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CN107899614B
CN107899614B CN201711155478.1A CN201711155478A CN107899614B CN 107899614 B CN107899614 B CN 107899614B CN 201711155478 A CN201711155478 A CN 201711155478A CN 107899614 B CN107899614 B CN 107899614B
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李为民
戎春勇
孙进龙
王福周
陈昶乐
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Changzhou University
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Abstract

The invention relates to a novel xanthene bridging amino-pyridine binuclear nickel catalyst and a preparation method thereof, and the catalyst is used for catalyzing ethylene polymerization to prepare polyethylene with lower polymerization degree and high branching degree.

Description

Binuclear xanthene bridged amido-nickel pyridine catalyst and preparation method and application thereof
Technical Field
The invention belongs to the field of catalysis, and particularly relates to a binuclear xanthene bridged amido-nickel pyridine catalyst, and a preparation method and application thereof.
Background
The main reason why diesel fuel loses fluidity at low temperature is that wax in diesel fuel is crystallized out to form wax crystals. The wax crystals grow rapidly and bond into a net skeleton structure to wrap the diesel oil inside, so that the diesel oil loses fluidity. When the pour point depressant is added in a proper amount, although the precipitation of the wax cannot be prevented, the size and the shape of the wax can be changed to weaken the capability of wax crystals to form a network structure, so that the flow property of the diesel oil is improved.
The diesel pour point depressant developed at home at present is few in variety, and the Von beautiful and the like (Von beautiful, Zhangqing, Wang Fang, etc.. the performance of the AVS type diesel pour point depressant [ J ]. oilfield chemistry, 2013,30(4):586 ion 589,593) adopts a free radical polymerization method to synthesize 4 kinds of alkyl acrylate-vinyl acetate-styrene terpolymers with different alkyl chain lengths, and the pour point depressing and filtration reducing effect of the copolymer on diesel oil is determined to find that the AVS-16 pour point depressing effect is better, the diesel oil pour point can be reduced by 12 ℃, but the filtration reducing effect is poorer; the AVS-18 has better filtration reducing effect, can reduce the cold filter plugging point of diesel by 4 ℃, and has better pour point depressing effect.
Development of Wangjingjing (Wangjingjing, Decanting Happy, Tanshu. P (DBF-VA) type modifier for improving low-temp. flowability of diesel oil [ J)]Fine petrochemical 2006,23(6): 22-24) Synthesis of fumaric acid double-chain Mixed ester-vinyl acetate binary copolymer by radical polymerization, enabling Tuha-10#、0#The cold filter plugging point of the diesel oil is respectively reduced by 10 ℃ and 7 ℃; make the Dushan mountain 0#The cold filter plugging point of the diesel oil is reduced by 12 ℃; clarityl 0#The cold filter plugging point of the diesel oil is reduced by 8 ℃.
The pour point depressant is mostly an ester polymer or a copolymer of ester and olefin, and has higher reaction temperature and higher production cost.
Disclosure of Invention
The invention provides a binuclear xanthene bridged amido-nickel pyridine catalyst which has high catalytic activity and mild polymerization reaction conditions, can catalyze ethylene oligomerization, can prepare ethylene oligomer with high branching degree, can be directly used as an oil pour point depressant, takes ethylene as a raw material, and has low production cost.
The binuclear xanthene bridged amido-nickel pyridine catalyst provided by the invention has a structure shown in the following formula (I):
Figure BDA0001473983620000021
wherein R is independently methyl or isopropyl.
The preparation method of the catalyst comprises the following steps:
(1) mixing boric acid compound A and aniline compound B (excess) in a molar ratio of 3-4:10 in an organic solvent, adding Pd (dba)2(the addition amount is 20 percent (w) of the boric acid compound A)) and triphenylphosphine (the addition amount is 10 percent (w) of the boric acid compound A)) are stirred and reacted for 12-24h at room temperature to formDiamine compound C:
Figure BDA0001473983620000022
wherein R is independently methyl or isopropyl.
(2) The diamine compound C and the aldehyde compound D are heated and refluxed in an organic solvent for 12-24h according to a molar ratio of 1:6-7 under the catalysis of organic acid to form a ligand E:
Figure BDA0001473983620000031
wherein R is independently methyl or isopropyl.
(3) And (3) heating and refluxing the ligand E and trimethylaluminum in an organic solvent for 5-10h in a molar ratio of 1:6 under the catalysis of organic acid to form a ligand F:
Figure BDA0001473983620000032
wherein R is independently methyl or isopropyl.
(4) Ligands F and (DME) NiBr at room temperature2The compounds are reacted in a solvent according to a molar ratio of 1:2 to obtain the catalyst with the structure shown in the formula (I).
Figure BDA0001473983620000033
Wherein R is independently methyl or isopropyl.
The organic acid in the step (2) and the step (3) is one of formic acid, acetic acid, p-toluenesulfonic acid or camphorsulfonic acid; and (3) in the step (1), the step (2), the step (3) and the step (4), the organic solvent is one or more of toluene, xylene, chlorobenzene, tetrahydrofuran and dichloromethane.
The preparation method of the catalyst used for catalyzing ethylene to prepare polyethylene with low polymerization degree and high branching degree comprises the following steps: adding catalyst promoter MAO and aromatic solvent into thick-wall pressure-resistant glass container under anhydrous and oxygen-free conditionsAnd (4) stirring. Connecting a pressure-resistant bottle with an ethylene pipeline, degassing the solution, heating to a required temperature, introducing ethylene gas, and dissolving in CH2Cl2The nickel complex catalyst of formula (I) is injected into a polymerization system and reacts under rapid stirring. After the reaction is finished, the pressure is released, and the reaction is stopped in acidified methanol to prepare the polyethylene.
Wherein the reaction temperature is 0-80 ℃; the ethylene pressure is 1-5 atm; the reaction time is 0.5-2 h.
The high-branching-degree polyethylene prepared by the catalysis of the binuclear xanthene bridging amino-pyridine nickel catalyst is used as a diesel pour point depressant, the molecular weight of the polyethylene is 1000-4000, and the branching degree is more than 80.
Has the advantages that: the catalyst prepared by the invention has high catalytic activity and mild polymerization reaction conditions, can catalyze ethylene oligomerization, and can prepare ethylene oligomer with high branching degree; the prepared oligomer can be used as an oil pour point depressant, ethylene is used as a raw material to produce the pour point depressant, and the cost is lower compared with the current ester polymer or copolymer pour point depressant of esters and olefin.
Detailed Description
The following examples illustrate the details of the invention and show the synthesis of ligands and complexes and the method of ethylene polymerization. The synthesis and polymerization processes of the complex are carried out under anhydrous and oxygen-free conditions, all sensitive substances are stored in a glove box, and all solvents are strictly dried to remove water. Ethylene gas is purified by a water removal oxygen removal column. All raw materials were purchased and used as received if not specifically stated.
The apparatus used was characterized as follows:
the nuclear magnetism detection is carried out by a Bruker 400MHz nuclear magnetism instrument. Elemental analysis (Vario EL cube). Molecular weight and molecular weight distribution were determined by high temperature GPC. Mass spectra were determined using Thermo LTQ Orbitrap XL (ESI +) or P-SIMS-Gly of Bruker Daltonics Inc (EI +).
Example 1:
9, 9-dimethyl-9-xanthene-4, 4' -bis [2- (2, 6-diisopropyl) aniline-2-ethyl ] pyridine is synthesized by the following reaction formula.
Figure BDA0001473983620000051
Taking xanthene diboronic acid (1.0g,3.4mmol), 1, 6-diisopropyl p-bromophenylamine (2.6g, 10.0mmol), sodium carbonate (1.0g,9.4mmol), Pd (dba)2(0.2g,0.35mmol), triphenylphosphine (0.1g,0.4mmol), H2O (4mL), ethanol (7mL) and toluene (24mL) were mixed and stirred at room temperature overnight, after the reaction was stopped, extracted with ethyl acetate, washed with sodium chloride, dried over magnesium sulfate, the solvent was dried, recrystallized by adding 10mL methanol, filtered and dried to give 9, 9-dimethyl-9-xanthene-4, 4' -bis (2, 6-diisopropyl) aniline (diamine compound C) as an off-white solid (1.0g, 54%).
After 9, 9-dimethyl-9-xanthene-4, 4' -bis (2, 6-diisopropyl) aniline (1.0g,1.79mmol), 2-pyridinecarboxaldehyde (1.30g,12.1mmol) and 0.05 equivalent of p-toluenesulfonic acid were dissolved in toluene (30mL), the mixture was refluxed for 24h, during which the degree of reaction was monitored by spotting plates. After the reaction was completed, the solvent was spin-dried, 20ml of methanol was added to conduct recrystallization, the mixture was a yellow solid at-20 ℃, filtered, and dried in vacuo to give 9, 9-dimethyl-9-xanthene-4, 4' -bis [2- (2, 6-diisopropyl) benzimine ] pyridine in 90% yield (1.21 g).
Taking 9, 9-dimethyl-9-xanthene-4, 4' -bis [2- (2, 6-diisopropyl) benzimine]Pyridine (1.21g,2mmol), trimethylaluminum (12mmol) and 0.1 equivalent of p-toluenesulfonic acid were dissolved in toluene (25 mL). In N2And (3) refluxing for 5h under the protection of atmosphere, and adding 1N ice NaOH solution after the reaction is stopped. The organic layer was washed twice with saturated NaCl solution, Na2SO4Drying, spin-drying solvent, adding a large amount of n-hexane, filtering, repeatedly washing the obtained white solid with n-hexane for 3 times, and vacuum drying to obtain 9, 9-dimethyl-9-xanthene-4, 4' -bis [2- (2, 6-diisopropyl) aniline-2-ethyl]Pyridine, 89% (1.12 g). 1H NMR (500MHz, CDCl3, ppm): δ 8.60(ddd, J ═ 5.0,1.9,1.0Hz,2H, pydine-H),7.52(dtd, J ═ 13.9,7.6,1.8Hz,2H, pydine-H),7.39(dd, J ═ 7.5,2.0Hz,2H, pydine-H), 7.10-7.17 (m,10H, pydine-H, aryl-H),7.04(ddt, J ═ 7.7,2.2,1.1Hz,2H, aryl-H),4.11(dd, J ═ 8.6,4.8Hz,2H, CHCH3),3.94(s,2H, NH), 3.03H, 3.03 ═ ch3(m,4H,CH(CH3)2),1.76(s,6H,xanthene-CH3),1.44(m,6H,CHCH3),0.95(d,J=6.7Hz,12H,CH(CH3)2),0.77(d,J=6.8Hz,12H,CH(CH3)2);13C{1H}NMR(125MHz,CDCl3,ppm):δ163.6,149.3,146.9,141.2,141.0,136.2,132.7,130.7,130.4,130.1,124.8,124.6,122.7,121.9,121.7,60.6(CHCH3),34.1(CHCH3),33.9(C(CH3)2),33.7(C(CH3)2),27.5(CH(CH3)2),24.2(CH(CH3)2),24.1(CH(CH3)2),22.4(CH(CH3)2);HRMS(m/z):calcd for C53H63N4O:771.5002;found:771.4367[M+H]+。
Example 2
9, 9-dimethyl-9-xanthene-4, 4' -bis [2- (2, 6-dimethyl) aniline-2-ethyl ] pyridine is synthesized by the following reaction formula.
Figure BDA0001473983620000061
Figure BDA0001473983620000071
The procedure was as above, and 1, 6-dimethyl-p-bromoaniline (2.0g,10mmol) was added to give 9, 9-dimethyl-9-xanthene-4, 4' -bis [2- (2, 6-dimethyl) aniline-2-ethyl ] pyridine, 84% (1.01 g). 1H NMR (500MHz, CDCl3, ppm): delta 8.44(m,2H, pydine-H),7.33(m, pydine-H),7.19(d, J ═ 7.4Hz,2H, pydine-H),7.01(d, J ═ 8.0Hz,4H, pydine-H, aryl-H),6.9(m,4H, aryl-H),6.80(s,4H, aryl-H),4.31(m,4H, CHCH3),3.94(s,2H, NH),1.86(s,12H, aryl-CH3),1.53(m,6H, xanthene-CH3),1.36(m,6H, CHCH 3); 13C {1H } NMR (125MHz, CDCl3, ppm): delta 164.2,149.2,147.5,143.9,136.2,130.4,130.2,130.0,128.8,128.4,124.2,122.7,121.9,121.3,57.8(CHCH3),34.4(C (CH3)2),32.3(C (CH3)2),23.1(CHCH3),18.8(aryl-CH 3); HRMS (m/z) calcd for C45H47N4O: 659.3750; found 659.4578[ M + H ] +.
Example 3
Synthesis of 9, 9-dimethyl-9-xanthene-4, 4' -bis [2- (2, 6-diisopropyl) aniline-2-ethyl ] pyridine nickel complex (Ni-A).
Figure BDA0001473983620000072
Take (DME)NiBr2(0.17g,0.54mmol) and 9, 9-dimethyl-9-xanthene-4, 4' -bis [2- (2, 6-diisopropyl) aniline-2-ethyl]Pyridine (0.21g,0.27mmol) was charged to a Schlenk flask, CH was added2Cl2(20mL), the mixture was stirred at room temperature for 12 h. The resulting suspension was filtered, the solvent was spun off, the resulting powder was washed with ether (2X 10mL), then dried under vacuum at room temperature to give a brown solid, Ni-A (0.21g, 67%). Elemental analysis results: c, 52.78; h, 5.01; n, 4.65; found is C, 52.38; h, 4.69; n, 4.57; MALDI-TOF-MS (m/z) calcd for C53H60Br2N4Ni2O: 1042.1841; found 1042.1324[ M-2 Br]+。
Example 4
Synthesis of 9, 9-dimethyl-9-xanthene-4, 4' -bis [2- (2, 6-dimethyl) aniline-2-ethyl ] pyridine nickel complex (Ni-B).
Figure BDA0001473983620000081
The procedure is as above, 9-dimethyl-9-xanthene-4, 4' -bis [2- (2, 6-dimethyl) aniline-2-ethyl is added]Pyridine (0.18g,0.27mmol) gave a brown solid powder, i.e., Ni-B (0.23g, 70%). Elemental analysis results: c, 49.41; h, 4.05; n, 5.12; found is C, 49.38; h, 3.69; n, 5.47; MALDI-TOF-MS (m/z): calcd for C45H44Br2N4Ni2O:930.0569;found:930.1324[M–2Br]+
Example 5
To a 350mL thick-walled pressure-resistant glass vessel, 0.2mL MAO, 20mL toluene, and a magnetic stirrer were added in a glove box. A pressure bottle was connected to the high pressure polymerization line and the solution was degassed. The vessel was warmed to the desired temperature (20 ℃,40 ℃ and 60 ℃ respectively) using an oil bath and allowed to equilibrate for 5 minutes. Then dissolved in 2mL CH by a 2.5mL syringe under the protection of ethylene gas atmosphere2Cl2The nickel complex (5. mu. mol) in examples 3 to 4 of (1) was injected into the polymerization system. The reactor was pressurized and maintained at 4.0atm of ethylene with rapid stirring. After half an hour, the pressure was released and the reaction was stopped in acidified methanol (methanol/HCl 100/3). The polymer obtained was washed thoroughly with methanol and at 40 deg.CVacuum drying for 24 hours.
TABLE 1 ethylene polymerization with catalysts under different temperature gradientsa
Figure BDA0001473983620000091
aPolymerization conditions Ni 5. mu. mol; Al/Ni 500; toluene is 20 mL; dichloromethane ═ 20 mL; the time is 30 min;bactivity 10 ═ 105g·mol-1·h-1cMolecular weight is g/mol; molecular weight was determined by high temperature GPC.
The oligomerization high-branching degree polyethylene is used in commercial 0# diesel oil for pour point depression experiment, the addition amount of the polyethylene is 0.3 percent, wherein the pour point of the 0# diesel oil is 0, and the cold filter plugging point is 3 ℃. The results are shown in Table 2 below, which can effectively reduce the freezing point and cold filter plugging point of diesel oil.
TABLE 2 pour point depressant test results
Figure BDA0001473983620000092

Claims (8)

1. A binuclear xanthene bridged amido-nickel pyridine catalyst is characterized in that: the catalyst has a structure shown in a formula (I):
Figure FDA0002317083480000011
wherein R is independently methyl or isopropyl.
2. A method for preparing the binuclear xanthene bridged amino-nickel pyridine catalyst according to claim 1, which comprises the following steps: the preparation method of the catalyst comprises the following steps:
(1) mixing the components in a molar ratio of 3-4:10 boric acid compound A and aniline compound B are mixed in an organic solvent, Pd (dba) is added2And triphenylphosphine under stirring at room temperature for 12-24h to form a diamine compound C, wherein Pd (dba)2And triphenylphosphine in an amount ofRespectively accounting for 20 percent and 10 percent of the mass of the boric acid compound A;
Figure FDA0002317083480000012
wherein R is independently methyl or isopropyl;
(2) heating diamine compound C and aldehyde compound D in a molar ratio of 1:6-7 in an organic solvent under the catalysis of organic acid, and carrying out reflux reaction for 12-24h to form ligand E:
Figure FDA0002317083480000021
wherein R is independently methyl or isopropyl;
(3) heating and refluxing ligand E and trimethylaluminum in a molar ratio of 1:6 in an organic solvent for 5-10h under the catalysis of organic acid to form ligand F:
Figure FDA0002317083480000022
wherein R is independently methyl or isopropyl;
(4) ligand F and (DME) NiBr in a molar ratio of 1:2 at room temperature2Reacting the compound in an organic solvent to obtain the catalyst with a structure shown in a formula (I), wherein DME (1, 2-dimethoxyethane):
Figure FDA0002317083480000023
wherein R is independently methyl or isopropyl.
3. The method for preparing the binuclear xanthene bridged amino-nickel pyridine catalyst according to claim 2, wherein the method comprises the following steps: the organic acid in the steps (2) and (3) is formic acid, acetic acid, p-toluenesulfonic acid or camphorsulfonic acid.
4. The method for preparing the binuclear xanthene bridged amino-nickel pyridine catalyst according to claim 2, wherein the method comprises the following steps: and (3) the organic solvent in the steps (1) to (4) is one or more of toluene, xylene, chlorobenzene, tetrahydrofuran, dichloromethane and ethanol.
5. The use of the binuclear xanthene bridged amino-nickel pyridine catalyst prepared by the method according to claim 2, wherein the binuclear xanthene bridged amino-nickel pyridine catalyst comprises the following steps: the catalyst is used for catalyzing ethylene oligomerization to prepare high-branching-degree polyethylene.
6. The use of the dinuclear xanthene bridged amino-nickel pyridine catalyst according to claim 5, wherein: the method for preparing the polyethylene with high branching degree by catalyzing ethylene oligomerization by using the catalyst comprises the following steps: adding methyl aluminoxane cocatalyst and aromatic hydrocarbon solvent into thick-wall pressure-resistant glass container under anhydrous and oxygen-free conditions, stirring, connecting the thick-wall pressure-resistant glass container with ethylene pipeline, degassing the solution, heating, introducing ethylene gas, and dissolving in CH2Cl2The nickel complex catalyst of the formula (I) is injected into a polymerization system, reacts under rapid stirring, and after the reaction is finished, the pressure is released and the reaction is stopped in acidified methanol to prepare the polyethylene.
7. The use of the dinuclear xanthene bridged amino-nickel pyridine catalyst according to claim 6, wherein: the reaction temperature is 0-80 ℃; the reaction time is 0.5-2 h; the ethylene pressure is 1-5 atm.
8. The use of the dinuclear xanthene bridged amino-nickel pyridine catalyst according to claim 6, wherein: the prepared polyethylene has the molecular weight of 1000-4000 and the branching degree of more than 80, and is used as a diesel pour point depressant.
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