CN105566039A - Ethene oligomerization continuous reaction method - Google Patents

Abstract

The invention discloses an ethene oligomerization continuous reaction method. The method comprises that a main catalyst 2, 8-diacetylquinoline(anil)FeCl2 shown in the formula (I), an aluminum-containing cocatalyst and an organic solvent are added into aqueous ethene as a raw material. The catalyst is used for an ethene oligomerization reaction process, has very high oligomerization reaction activity and high alpha-ethene selectivity, realizes fast oligomerization reaction initiation, stable reaction process and good repeatability and still has very good oligomerization reaction activity at a low aluminum/iron ratio. The ethene oligomerization continuous reaction method overcomes technology biases of the technicist in the field, produces unforeseeable technical effects, realizes good balance of catalysis effects and a cost, greatly reduces an ethene oligomerization reaction cost and has good practicality and a wide industrial application prospect.

Description

A kind of ethylene oligomerization continuous reaction method

Technical field

The present invention relates to ethylene oligomerization field, be specifically related to a kind of for ethylene oligomerization continuous reaction method.

Background technology

Linear alpha-alkene has a wide range of applications in fields such as ethylene comonomer, synthesis of surfactant intermediate, softening agent alcohol, ucon oil and oil dopes.In recent years, along with the development of polyolefin industry, the demand rapid development to alpha-olefin in world wide.The alpha-olefin of the current overwhelming majority is obtained by ethylene oligomerization preparation.Ethylene oligomerization method catalyzer used mainly contains nickel system, chromium system, zirconium system and aluminium system etc.In recent years, Brookhart group (people such as Brookhart, M, J.Am.Chem.Soc., 1998,120,7143-7144; WO99/02472,1999), Gibson group (people such as Gibson, V.C., Chem.Commun., 1998,849-850; Chem.Eur.J., 2000,2221-2231) find that the trident pyridinimine title complex of some Fe (II) and Co (II) can catalyzed ethylene oligomerisation respectively, not only the catalytic activity of catalyzer is very high, and the selectivity of alpha-olefin is also very high.

Institute of Chemistry, Academia Sinica reports a kind of catalyzer (Organometallics2010 for ethylene oligomerization and polymerization; 29; 1168 – 1173); this catalyzer is chlorination 2; 8-diacetyl quinoline contracting amine closes iron (II) title complex; under the effect of promotor methylaluminoxane; when the mol ratio of the metallic aluminium in promotor and the central metal in Primary Catalysts is 1500 ~ 3000; and when temperature of reaction is 40 ~ 100 DEG C, oligomerisation and polymerization activity have been up to 10⁶gmol (Fe)^-1h^-1; And no matter be methylaluminoxane, or modified methylaluminoxane is as promotor, all there is high cost, the problem that consumption is excessive, and as promotor large-scale application when the ethylene oligomerization, it certainly will cause production cost high.

At present, it has been generally acknowledged that water is very disadvantageous to ethylene oligomerization reaction process, CN200810111717.8 discloses a kind of method of ethylene oligomerization, carry out under being strict controlled in the environment of anhydrous and oxygen-free, therefore current ethylene oligomerization reaction is very harsh to processing requirement, causes the reaction initiation of oligomerisation reaction technique and all non-constant of repeatability.

In addition, the ethene water content of polymerization-grade requires at below 5ppm, and this makes the processing condition of producing ethene comparatively harsh.

Summary of the invention

For deficiency of the prior art, contriver has carried out research extensively and profoundly in ethylene oligomerization catalyst field, be surprised to find, the Primary Catalysts chlorination 2 shown in formula (I) is comprised what add containing certain water ethylene raw, 8-diacetyl quinoline contracting amine closes iron (II) title complex, carries out oligomerisation reaction containing under the effect of aluminum cocatalyst organic solvent, there is higher oligomerisation reaction on the contrary active, and oligomerisation reaction cause rapidly, operate steadily, reproducible; Thus overcome the technology prejudice of those skilled in the art, achieve unforeseeable technique effect.

According to an aspect of the present invention; provide a kind of ethylene oligomerization continuous reaction method; use moisture ethene for raw material, add title complex chlorination 2,8-diacetyl quinoline contracting amine shown in formula (I) close iron (II) be Primary Catalysts, containing aluminum cocatalyst and organic solvent:

In formula (I), R¹~ R⁵be selected from hydrogen, C independently of one another₁~ C₆alkyl, halogen, C₁-C₆alkoxyl group and nitro.

According to ethylene oligomerization continuous reaction method provided by the invention, have higher ethylene oligomerization reactive behavior, the selectivity of alpha-olefin is high.In method of the present invention, with the quality of ethene for Calculation Basis, the mass content of water is that 15 ~ 1050ppm is (namely based on the ethene of 1g, containing 15 ~ 1050 × 10^-6the water of g), preferably 60 ~ 780ppm, most preferably is 150 ~ 600ppm.Within the scope of described water-content, it is active that described ethylene oligomerization reaction method has higher ethylene oligomerization.

In the method for the invention, the consumption of described Primary Catalysts and promotor can be selected according to the processing condition during embody rule such as industrial scale and production unit.In a specific embodiment of described method, described Primary Catalysts adds as a solution, and the organic solvent of the organic solvent that obtain solution is used and reaction may be the same or different.In described solution, the concentration of Primary Catalysts is that 1.0 ~ 10.0 μm of ol/mL/mL are (namely based on the organic solvent of 1mL, containing 2 ~ 500 × 10 in solution^-6the Primary Catalysts of mol), preferably 2.0 ~ 5.0 μm of ol/mL, more preferably 2.0 ~ 3.0 μm of ol/mL, most preferably 2.5 μm of ol/mL.

In the present invention, the mol ratio of the iron in the aluminium in wherein said promotor and described Primary Catalysts is 30 to being less than 900:1, preferably 100 ~ 700:1.In a specific embodiment of aforesaid method, the mol ratio of described aluminium and iron is 148 ~ 197:1, as 148 ~ 196.8:1.Even if in the lower molar ratio range provided, the ethylene oligomerization activity in described method is still higher.In a specific examples, the described aluminum cocatalyst that contains also can add as a solution, and the organic solvent of the organic solvent that obtain solution is used and reaction may be the same or different.

In the present invention, the R in described Primary Catalysts¹-R⁵be selected from hydrogen, methyl, ethyl, n-propyl, sec.-propyl, fluorine, chlorine, bromine, methoxyl group, oxyethyl group and nitro independently of one another.In a specific embodiment of aforesaid method, the R in described Primary Catalysts¹and R⁵for methyl, R²-R⁴be hydrogen.

In the present invention, described organic solvent is selected from toluene, hexanaphthene, ether, tetrahydrofuran (THF), ethanol, benzene, dimethylbenzene and methylene dichloride, is preferably selected from toluene and dimethylbenzene.In a specific embodiment, described Primary Catalysts and/or promotor all first can use organic solvent dissolution, are mixed with solution, and then add.

In the present invention, term " C₁-C₆alkyl " refer to saturated straight chain containing 1-6 carbon atom or branched hydrocarbyl.As C₁-C₆alkyl, can mention methyl, ethyl, n-propyl, sec.-propyl, normal-butyl, isobutyl-, sec-butyl, the tertiary butyl, n-pentyl, isopentyl, sec.-amyl sec-pentyl secondary amyl, n-hexyl and Sec-Hexyl; Particularly preferably methyl, ethyl, n-propyl and sec.-propyl.

In the present invention, term " C₁-C₆alkoxyl group " refer to above-mentioned C₁-C₆alkyl is connected with a Sauerstoffatom group obtained.As C₁-C₆alkoxyl group, can mention methoxyl group, oxyethyl group, positive propoxy, isopropoxy, n-butoxy, isobutoxy, sec-butoxy, tert.-butoxy, n-pentyloxy, secondary pentyloxy, positive hexyloxy and secondary hexyloxy; Particularly preferably methoxyl group and oxyethyl group.

In the present invention, term " halogen " refers to fluorine, chlorine, bromine and iodine, particularly preferably fluorine, chlorine and bromine.

In the present invention, the described aluminum cocatalyst that contains is selected from aikyiaiurnirsoxan beta and alkylaluminium cpd, preferred alkyl aluminum compound.

In the present invention, the general formula of described alkylaluminium cpd is AlR_nx_m, wherein R is straight or branched C independently of one another₁-C₈alkyl; X is halogen separately, preferred chlorine or bromine; N is the integer of 1 ~ 3, and m is the integer of 0 ~ 2, and m+n equals 3; Preferably, described alkylaluminium cpd is excellent in trimethyl aluminium, triethyl aluminum, tri-propyl aluminum, triisobutyl aluminium, tri-n-hexyl aluminum, tri-n-octylaluminium, diethylaluminum chloride and ethylaluminium dichloride, more preferably triethyl aluminum.

In the present invention, described aikyiaiurnirsoxan beta is C₁-C₄alkylaluminoxane, wherein C₁-C₄alkyl is the alkyl of straight or branched; Preferably, described aikyiaiurnirsoxan beta is selected from methylaluminoxane, modified methylaluminoxane, ethylaluminoxane and isobutyl aluminium alkoxide; More preferably methylaluminoxane.

The preparation method that Primary Catalysts chlorination 2,8-diacetyl quinoline contracting amine conjunction iron (II) title complex shown in general formula of the present invention (I) can adopt document (Organometallics2010,29,1168 – 1173) to report obtains.

In one embodiment of the invention, described Primary Catalysts and/or promotor first can add reaction system with after organic solvent dissolution again, and also namely Primary Catalysts and/or promotor use as a solution.

In the present invention, described organic solvent is selected from toluene, hexanaphthene, ether, tetrahydrofuran (THF), ethanol, benzene, dimethylbenzene and methylene dichloride, is preferably selected from toluene and dimethylbenzene.The consumption of described organic solvent can be selected according to the processing condition during embody rule such as industrial scale and production unit by those skilled in the art.In a specific embodiment, the mass ratio of described organic solvent and ethene is 0.5 ~ 20:1, preferably 0.9 ~ 10:1, is more preferably 1 ~ 2.5:1.In a specific examples, described oligomerisation reaction process, Primary Catalysts and promotor be blended in ethene atmosphere under carry out.The temperature of described oligomerisation reaction is-20 ~ 150 DEG C, is preferably 0 ~ 80 DEG C, is more preferably 5 ~ 40 DEG C.The pressure of described reaction is 0.1 ~ 30MPa, raises along with ethylene pressure raises oligomerization activity.Pressure is 1 ~ 5MPa preferably.

The present invention puies forward described method specific embodiment can comprise the steps: that (1) is in continuous reaction apparatus, moisture ethene, solvent, Primary Catalysts solution and promotor solution enter reactor respectively by certain flow, and remaining on the reaction mass residence time is in the reactor 30min; (2) keep reaction pressure be 0.1 ~ 30MPa and temperature of reaction be at-20 ~ 150 DEG C reaction; (3) gas-chromatography is carried out to reaction outlet material and carry out (GC) analysis.

Use catalyzer of the present invention to carry out ethylene oligomerization, the ethylene oligomerization product of acquisition comprises C₄, C₆, C₈, C₁₀, C₁₂, C₁₄, C₁₆, C₁₈, C₂₀, C₂₂deng; The selectivity of alpha-olefin can reach more than 96%.After ethylene oligomerization reaction terminates, carry out GC analysis.Result shows, oligomerization activity can reach 10⁷gmol (Fe)^-1h^-1above.In addition, the remaining reaction mixture ethanolic soln of the dilute hydrochloric acid acidifying of 5% neutralizes, and does not obtain polymkeric substance.

According to catalyzer provided by the invention; moisture ethene is comprising the Primary Catalysts chlorination 2 shown in formula (I); 8-diacetyl quinoline contracting amine closes iron (II) title complex, carries out oligomerisation reaction containing under the effect of aluminum cocatalyst and organic solvent; there is higher oligomerisation reaction on the contrary active; the selectivity of alpha-olefin is high, and oligomerisation reaction cause rapidly, operate steadily, reproducible.According to the present invention, even if at low-down Al/Fe than under condition, still there is good oligomerisation reaction active.According to the present invention, when the reaction is performed at a lower temperature, still there is high oligomerisation reaction active.According to the present invention, overcome the technology prejudice of those skilled in the art, achieve unforeseeable technique effect.

Embodiment

Below in conjunction with specific embodiment, the present invention is further elaborated and illustrate, but do not form any limitation of the invention.

Embodiment 1

1. Primary Catalysts chlorination 2,8-diacetyl quinoline contracting 2 ', 6 '-xylidine closes the synthesis of iron (II) title complex

The preparation method reported according to document (Organometallics2010,29,1168 – 1173) obtains chlorination 2,8-diacetyl quinoline contracting 2 ', 6 '-xylidine and closes iron (II) title complex.

2. ethylene oligomerization successive reaction, specifically comprise the steps: that (1) is in 100ml continuous reaction apparatus, (concentration is 2.5 μm of ol/ml for moisture ethene, solvent xylene, Primary Catalysts solution, solvent is dimethylbenzene) and promotor solution (concentration is 715 μm of ol/ml, solvent is dimethylbenzene) enter reactor respectively, flow is respectively 80g/h, 168.26g/h, 3.40g/h and 2.34g/h, in reaction system, Al/Ti is 196.8, and remaining on the reaction mass residence time is in the reactor 30min; (2) reaction pressure is 1MPa and temperature of reaction is 30 DEG C, and wherein, take ethene as Calculation Basis, the mass content of water is 15ppm; (3) gas-chromatography is carried out to reaction outlet material and carry out (GC) analysis: oligomerization activity is 0.35 × 10⁷gmol (Fe)^-1h^-1, oligomer content is respectively C₄40.56%, C₆~ C₁₀49.23%, C₆~ C₁₈61.48% (wherein containing linear alpha-alkene 97.2%), C₂₀~ C₂₈0.59%.The remaining mixture ethanolic soln of the hcl acidifying of 5% neutralizes, and does not obtain polymkeric substance.Analytical results is in table 1.

Embodiment 2

With embodiment 1, difference is, the mass content of water is 60ppm.Data are in table 1.

Embodiment 3

With embodiment 1, difference is, the mass content of water is 150ppm.Data are in table 1.

Embodiment 4

With embodiment 1, difference is, the mass content of water is 360ppm.Data are in table 1.

Embodiment 5

With embodiment 1, difference is, the mass content of water is 600ppm.Data are in table 1.

Embodiment 6

With embodiment 1, difference is, the mass content of water is 780ppm.Data are in table 1.

Embodiment 7

With embodiment 1, difference is, the mass content of water is 1050ppm, and data are in table 1.

Embodiment 8

With embodiment 1, difference is, the mass content of water is 360ppm, and temperature of reaction is 0 DEG C.Data are in table 1.

Embodiment 9

With embodiment 1, difference is, the mass content of water is 360ppm, and temperature of reaction is-10 DEG C.Data are in table 1.

Embodiment 10

With embodiment 1, difference is, the mass content of water is 360ppm, and temperature of reaction is-20 DEG C.Data are in table 1.

Embodiment 11

With embodiment 1, difference is, the mass content of water is 360ppm, and temperature of reaction is 40 DEG C.Data are in table 1.

Embodiment 12

With embodiment 1, difference is, when moisture ethene, solvent, Primary Catalysts solution (concentration is 2.5 μm of ol/ml) and promotor solution (concentration is 715 μm of ol/ml) are entered reactor respectively, flow is respectively 80g/h, 164.6g/h, 3.40g/h and 6.0g/h, Al/Fe=504.7 in reaction system, the mass content of water is 360ppm, and data are in table 1.

Comparative example 1

With embodiment 1, difference is, adopts anhydrous ethene.Data are in table 1.

Data as can be seen from table 1; according to ethylene oligomerization continuous reaction method provided by the invention; moisture ethene is comprising the Primary Catalysts chlorination 2 shown in formula (I); 8-diacetyl quinoline contracting amine closes iron (II) title complex, carries out oligomerisation reaction containing under the effect of aluminum cocatalyst and organic solvent; there is higher oligomerisation reaction on the contrary active; the selectivity of alpha-olefin is high, and oligomerisation reaction cause rapidly, operate steadily, reproducible.According to the present invention, even if at low-down Al/Fe than under condition, still there is good oligomerisation reaction active.According to the present invention, when the reaction is performed at a lower temperature, still there is high oligomerisation reaction active.

It should be noted that above-described embodiment only for explaining the present invention, not forming any limitation of the invention.By referring to exemplary embodiments, invention has been described, but to should be understood to word wherein used be descriptive and explanatory vocabulary, instead of limited vocabulary.Can modify the present invention by the scope being defined in the claims in the present invention, and the present invention be revised not deviating from scope and spirit of the present invention.Although the present invention wherein described relates to specific method, material and embodiment, and do not mean that the present invention is limited to particular case disclosed in it, on the contrary, easily extensible of the present invention is to other all methods and applications with identical function.

Table 1

Claims (10)

1. an ethylene oligomerization continuous reaction method, uses moisture ethene for raw material, add title complex chlorination 2,8-diacetyl quinoline contracting amine shown in formula (I) close iron (II) be Primary Catalysts, containing aluminum cocatalyst and organic solvent:

In formula, R¹~ R⁵be selected from hydrogen, C independently of one another₁~ C₆alkyl, halogen, C₁~ C₆alkoxyl group and nitro; Preferably, R¹-R⁵be selected from hydrogen, methyl, ethyl, n-propyl, sec.-propyl, fluorine, chlorine, bromine, methoxyl group, oxyethyl group and nitro independently of one another; More preferably R¹and R⁵for methyl, and R²-R⁴be hydrogen.

2. method according to claim 1, is characterized in that, take ethene as Calculation Basis, ethene water content is 15 ~ 1050ppm, preferably 60 ~ 780ppm, most preferably is 150 ~ 600ppm.

3. method according to claim 1 and 2, is characterized in that, described Primary Catalysts adds as a solution, and its concentration is 1.0 ~ 10.0 μm of ol/mL, preferably 2.0 ~ 5.0 μm of ol/mL, more preferably 2.0 ~ 3.0 μm of ol/mL, most preferably 2.5 μm of ol/mL.

4. according to the method in claim 1-3 described in any one, it is characterized in that, the described aluminum cocatalyst that contains is selected from aluminum alkyls and aluminium alkoxide compound, preferred alkyl aluminum compound.

5. method according to claim 4, is characterized in that, the general formula of described alkylaluminium cpd is AlR_nx_m, wherein R is straight or branched C independently of one another₁-C₈alkyl; X is halogen, preferred chlorine or bromine; N is the integer of 1 ~ 3, and m is the integer of 0 ~ 2, and m+n equals 3; Preferably, described alkylaluminium cpd is selected from trimethyl aluminium, triethyl aluminum, tri-propyl aluminum, triisobutyl aluminium, tri-n-hexyl aluminum, tri-n-octylaluminium, diethylaluminum chloride and ethylaluminium dichloride; More preferably triethyl aluminum.

6. the method according to claim 4 or 5, is characterized in that, described aikyiaiurnirsoxan beta is C₁-C₄alkylaluminoxane, wherein C₁-C₄alkyl is the alkyl of straight or branched; Preferably, described aikyiaiurnirsoxan beta is selected from methylaluminoxane, modified methylaluminoxane, ethylaluminoxane and isobutyl aluminium alkoxide; Be more preferably methylaluminoxane.

7. according to the method in claim 1 ~ 6 described in any one, it is characterized in that, described is 30 to being less than 900:1 containing the mol ratio of iron in aluminium in aluminum cocatalyst and Primary Catalysts, and preferred 100-700:1, is more preferably 148-197:1.

8. according to the method in claim 1 ~ 7 described in any one, it is characterized in that, described organic solvent is selected from toluene, hexanaphthene, ether, tetrahydrofuran (THF), ethanol, benzene, dimethylbenzene and methylene dichloride, is preferably selected from toluene and dimethylbenzene.

9. according to the method in claim 1-8 described in any one, it is characterized in that, the mass ratio of described organic solvent and ethene is 0.5 ~ 20:1, preferably 0.9 ~ 10:1, is more preferably 1 ~ 2.5:1.

10. according to the method in claim 1-9 described in any one, it is characterized in that, the temperature of described oligomerisation reaction is-20 ~ 150 DEG C, is preferably 0 ~ 80 DEG C, is more preferably 5 ~ 40 DEG C; And/or oligomerisation reaction pressure is 0.1 ~ 30MPa, more preferably pressure is 1 ~ 5MPa.