CN109456433B - Method for preparing high-activity polyisobutene in ionic liquid medium - Google Patents

Method for preparing high-activity polyisobutene in ionic liquid medium Download PDF

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CN109456433B
CN109456433B CN201811372303.0A CN201811372303A CN109456433B CN 109456433 B CN109456433 B CN 109456433B CN 201811372303 A CN201811372303 A CN 201811372303A CN 109456433 B CN109456433 B CN 109456433B
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ionic liquid
reactor
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isobutene
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CN109456433A (en
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伍一波
李晓宁
张经翰
杨丹
王浩
李树新
郭文莉
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Beijing Institute of Petrochemical Technology
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    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F110/00—Homopolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
    • C08F110/04—Monomers containing three or four carbon atoms
    • C08F110/08—Butenes
    • C08F110/10—Isobutene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08F2/00—Processes of polymerisation
    • C08F2/04—Polymerisation in solution
    • C08F2/06—Organic solvent
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F4/00—Polymerisation catalysts
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F4/00—Polymerisation catalysts
    • C08F4/06—Metallic compounds other than hydrides and other than metallo-organic compounds; Boron halide or aluminium halide complexes with organic compounds containing oxygen
    • C08F4/16—Metallic compounds other than hydrides and other than metallo-organic compounds; Boron halide or aluminium halide complexes with organic compounds containing oxygen of silicon, germanium, tin, lead, titanium, zirconium or hafnium
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    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/50—Improvements relating to the production of bulk chemicals
    • Y02P20/54—Improvements relating to the production of bulk chemicals using solvents, e.g. supercritical solvents or ionic liquids

Abstract

The invention discloses a method for preparing high-activity polyisobutene in an ionic liquid medium, belonging to the technical field of synthesis of high-molecular homopolymers. The method adopts ionic liquid as solvent, uses isobutene as raw material at the temperature of-7 to-30 ℃, and prepares high-activity polyisobutylene through positive ion polymerization under different initiating systems and different feeding modes thereof; the number average molecular weight of the obtained high-activity polyisobutene is 500-5000g/mol, the molecular weight distribution is narrow and is 1.5-3.0; the conversion rate of isobutene is 50-100%; the content of exo-olefin terminal structure is in the range of 70 to 99 mol%. The preparation method has the advantages of simple preparation process, good repeatability, recoverability and cyclic practicality of the ionic liquid and the catalytic system, and contribution to reducing the production cost.

Description

Method for preparing high-activity polyisobutene in ionic liquid medium
Technical Field
The invention belongs to the technical field of synthesis of high-molecular homopolymers, and particularly relates to a method for preparing high-activity polyisobutylene in an ionic liquid medium.
Background
Low molecular weight Polyisobutylene (PIB) (Mn 500-. Currently, the low molecular weight polyisobutylenes on the market are divided into two categories: (i) conventional polyisobutenes and (ii) highly reactive polyisobutenes (HR PIB). The main use of highly reactive polyisobutenes, in contrast to conventional polyisobutenes, is the production of polyisobutene succinimide ashless dispersants by direct thermal addition (Mach H., Rath P., Lung Science,1999,11(2): 175). The ashless dispersant has wide application range, and the main application is as follows: fuel additive, fuel detergent, emulsifier for producing emulsion explosive and scale inhibitor in petroleum refining and petrochemical process. Besides, the derivatives of HR PIB can be used as internal plasticizer and moisturizing and skin moistening of cosmetics.
The conventional synthesis of highly reactive polyisobutenes (Exxon Process) is based on AlCl3Or EtAlCl2The polymerization of the C4 mixture was co-initiated. The "conventional" polyisobutenes obtained in this way contain predominantly tri-and tetra-substituted olefinic end groups, which are much less reactive than the exo-olefinic end groups. Therefore, there is a need for the preparation of HR PIB by the chlorination-dehydrochlorination process of polyisobutylene; although the HR PIB obtained by this process has a very high content of alpha-olefin end groups (. alpha. -olefin. gtoreq.95%), the main disadvantages of this process are that the polymer has to be purified and that the dehydrochlorination time is too long and that tetrahydrofuran is used as solvent; references "Kostjuk sergi-v., RSC adv.,2015,5: 13125"; besides, the method also causes the generation of a large amount of chlorine-containing waste water, and volatile organic solvents cause environmental pollution, so the method is not environment-friendly.
Commercial highly reactive polyisobutenes are obtained by BF using the technique of BASF corporation3With an alcohol and/or ether as a co-initiator, at moderate to high temperatures (-20 to-10 ℃) in an organic hydrocarbon solvent. However, the major drawback of this technique is BF3Is in a gaseous state and thus difficult to handle, and is harmful to the equipment. Due to the upcoming changes in the technical standards of lubricating oil/fuel additives, coupled with the increasing demand for HR PIB in recent years, there has been an increasing interest among various research institutions and industry companies in improving the synthesis process of HR PIB. Several new methods of synthesizing HR PIB continue to emerge.
Some new methods of synthesizing HR PIB reported in recent years have been reviewed in some foreign literature. The method comprises the following steps: one is a method based on end group quenching of living cationic polymerization to obtain HR PIB. Commonly used methods for end group quenching are: allyltrimethylsilane (ATMS)) end group quenching, hindered base end group quenching, and sulfide andether end group quenching; another method is based on the conventional cationic polymerization, which uses conventional complexes of metal halides and ethers as coinitiators for the cationic polymerization of isobutene. AlCl was used first3/R2O; subsequent FeCl3(GaCl3)/R2O was subsequently used for the synthesis of HR PIB. To improve AlCl3Solubility of the catalyst in nonpolar solvents, RAlCl2/R2The O catalytic systems are generated sequentially.
The domestic synthesis method of HR PIB mainly adopts BF3And metal chloride complexes with alcohols or ethers as catalytic systems.
In patent CN00130281.7 and the like, BF is adopted3And (3) synthesizing HR PIB by using the complex catalyst.
Patent CN200810115711.8 adopts AlCl in a liquid phase isobutene raw material polymerization system3The catalyst and oxygen-containing organic compounds form a complex catalyst to initiate isobutylene polymerization, the number average molecular weight of the synthesized high-activity polyisobutylene is generally 800-5000 daltons, and the content of alpha-double bonds at chain ends is generally increased to more than 80 mol%, even more than 90 mol%.
Patent CN201310041415.9 proposes the use of TiCl in the presence of an alcohol, a phenol and/or an ether organic compound4The method for preparing high-activity polyisobutylene by co-initiating isobutylene cationic polymerization directly obtains high-activity polyisobutylene with narrow molecular weight distribution (distribution index can reach 1.2) by adjusting the dosage proportion of alcohol, phenol or ether and the counter ion steric hindrance, and the content of alpha-double bond at the chain end can reach more than 90 percent.
Patent CN201110124655.6 adopts SnCl4HR PIB is synthesized by an initiating system consisting of water and oxygen-containing, nitrogen-containing and/or sulfur-containing organic compounds, the polymerization temperature is-60-30 ℃, and the content of the terminal group alpha-double bond can reach 98% optimally.
Patent CN200810115710.3 adopts AlR(3-n)ClnThe compound, phenols or piperidines and alkyl ethers are used as a catalytic system to initiate isobutylene polymerization, the number average molecular weight of the prepared polyisobutylene is 500-15000 daltons, and the content of the terminal alpha-double bond is optimally 96 mol%.
Patent CN200910089266.7 adopts FeCl3The complex with oxygen-containing or sulfur-containing organic compound is used as a catalytic system to directly obtain the high-activity polyisobutene with the terminal alpha-double bond content of more than 75mol percent (up to more than 90 percent) and narrow molecular weight distribution.
Although HR PIB based on metal halide and ether complexes as catalytic systems has rapidly developed, the commercial synthesis of HR PIB has been based on BF3The complex catalyst system and other methods are not developed industrially.
The ionic liquid is used as a green solvent and is widely applied to the fields of organic synthesis and catalysis, macromolecular synthesis, oligomerization of isobutene and the like. WO 00/32658 reports on the use of [ Emim]AlCl4A process for the synthesis of high molecular weight polyisobutenes (molecular weights up to 100,000) for initiators or co-solvents, but the patent does not describe the structure of the polymer. Further literature reports the use of [ emim]Cl–AlCl3Using isopropyl ether complex as new catalyst for synthesizing HR PIB, and at higher temperature of 0-10 deg.c and monomer concentration of 5.2-7.8M, the positive ion polymerization of isobutene in hexane solvent to obtain catalyst with relatively narrow molecular weight distributionw/MnNot more than 2.0), the content of alpha-double bond at the end is not less than 90 percent.
Disclosure of Invention
The invention aims to provide a method for preparing high-activity polyisobutene in an ionic liquid medium, which is characterized in that the high-activity polyisobutene is prepared by taking ionic liquid as a solvent, taking isobutene as a raw material under the temperature condition of-7 to-30 ℃ and through cationic polymerization under different initiating systems and different charging modes thereof; the number average molecular weight of the obtained high-activity polyisobutene is 500-5000g/mol, and the molecular weight distribution is 1.5-3.0; the conversion rate of isobutene is 50-100%; the content of exo-olefin terminal structure is in the range of 70 to 99 mol%.
The initiation system consists of a main initiator and a co-initiator; the concentration of the main initiator is 0.1 to 1 x 10-4mol/L, preferably 0.05 to 2X 10-3mol/L; concentration ratio of co-initiator to main initiator: 0.1 to 60(ii) a Preferably 1 to 40.
The charging method of the main initiator and the coinitiator as the initiating system adopts the steps that the main initiator and the coinitiator are respectively charged, or the main initiator and the coinitiator are mixed and then are added into the reactor; or mixing the main initiator and the co-initiator, aging and adding the mixture into a reactor.
The initiation system takes water as a main initiator, and the co-initiator is aluminum trichloride (AlCl)3) Ethyl aluminium dichloride (EtAlCl)2) Trichlorotriethyldialuminum (Et)3Al2Cl3) Titanium tetrachloride (TiCl)4) Boron trifluoride (BF)3) Boron trichloride (BCl)3) Ferric chloride (FeCl)3) And the like.
The monomer concentration of the isobutene is 0.5-8 mol/L, and preferably 3-6 mol/L.
The cation of the ionic liquid is selected from imidazolium salt cation, pyridinium salt cation, quaternary ammonium salt cation and the like.
The imidazolium salt cation is selected from N, N' -dialkyl imidazolium cation; the pyridinium cation is alkyl pyridine cation; the quaternary ammonium salt cation is alkyl pyrrole salt cation.
The anion of the ionic liquid is selected from water and air stable anions including: BF (BF) generator4 -、PF6 -、TA(CF3COO-)、TfO-(CF3SO3)、NfO-(C4F9SO3 -)、Tf2N-((CF3SO2)2N-)、BeTi(C2F5SO2)2N-)、Tf3C-((CF3SO2)3C-)、SbF6 -、AsF6 -、EtSO4 -、MeSO4 -(ii) a Among them, non-coordinating anions are preferred: BF (BF) generator4 -、PF6 -、TfO-、Tf2N-And BeTi;
the method for preparing the high-activity polyisobutylene according to different feeding modes of an initiating system comprises the following steps:
mode 1, the preparation of high-activity polyisobutylene by feeding a main initiator and a co-initiator respectively comprises the following steps:
(1) feeding into a reactor: under the condition of-7 to-30 ℃, 1-50mL of ionic liquid, initiator and coinitiator are added into a reactor, and each material needs to be uniformly mixed;
(2) polymer synthesis: under the condition of-7 to-30 ℃, 1-30mL of isobutene is added into a reactor, polymerization reaction is carried out under stirring, precooled methanol is added for termination reaction after 10-60 min of polymerization reaction, products are collected by simple decantation and washed by methanol for a plurality of times, and high-activity polyisobutene is obtained by vacuum drying.
In the mode 2, a main initiator and a coinitiator are mixed and then added into a reactor; or the main initiator and the coinitiator are mixed and aged and then added into a reactor to prepare the high-activity polyisobutene, comprising the following steps:
(1) initiator system configuration: fully mixing the coinitiator and the initiator according to the proportion of 1-40 of the coinitiator and the initiator, and aging at low temperature for 2-10 min;
(2) feeding into a reactor: under the condition of-7 to-30 ℃, 1-50mL of ionic liquid and an initiator system are added into a reaction kettle and mixed evenly;
(3) polymer synthesis: under the condition of-7 to-30 ℃, 1-30mL of isobutene is added into a reactor, polymerization reaction is carried out under stirring, precooled methanol is added for termination reaction after 10-60 min of polymerization reaction, products are collected by simple decantation and washed by methanol for a plurality of times, and high-activity polyisobutene is obtained by vacuum drying.
The prepared highly reactive polyisobutenes are used for preparing lubricating oil and fuel additives and for preparing telechelic polymers by further functionalization of the polyisobutenes.
The preparation method has the beneficial effects that the ionic liquid is used as a solvent, an ionic environment is provided for the positive ion polymerization of isobutene, the ionization of an initiation system is promoted, the carbonium ion active center is stabilized, the reaction rate is controlled, the molecular weight distribution is reduced, and the molecular weight distribution range is 1.5-3.0; the selectivity of polymer products is improved, the stability of an initiation system in ionic liquid is higher, the yield of synthesized high-activity polyisobutene is higher, and the conversion rate of isobutene is 50-100%. The molecular weight of the polymerization product is 800-5000g/mol, and the content of the external olefin terminal structure in the highly reactive polyisobutene synthesized by this process is in the range from 70 to 99 mol%.
Drawings
FIG. 1 is a diagram of HR PIB of the product synthesized in example 11H NMR spectrum.
FIG. 2 is a GPC curve of HR PIB for the product synthesized in example 1.
FIG. 3 is a diagram of HR PIB of the product synthesized in example 31H NMR spectrum.
FIG. 4 is a GPC curve of HR PIB for the product synthesized in example 3.
FIG. 5 is a diagram of HR PIB of the product of the synthesis of example 71H NMR spectrum.
FIG. 6 is a diagram of HR PIB of the product synthesized in example 91H NMR spectrum.
Detailed Description
The invention provides a method for preparing high-activity polyisobutene in an ionic liquid medium, which adopts ionic liquid as a solvent, uses isobutene as a raw material at the temperature of-7 to-30 ℃, and prepares the high-activity polyisobutene by positive ion polymerization under different initiating systems and different feeding modes thereof; the number average molecular weight of the obtained high-activity polyisobutene is 500-5000g/mol, and the molecular weight distribution is 1.5-3.0; the conversion rate of isobutene is 50-100%; the content of exo-olefin terminal structure is in the range of 70 to 99 mol%.
The invention is further illustrated by the following examples, to which the invention is not limited, by GPC and1H NMR。
example 1
9mL of [ Bmim ] was added to the reactor][PF6]、1.38mLCH2Cl21.2mL of 1mol/L TiCl4Mixing the solution while adding, uniformly mixing, placing in a cooling liquid for 5min, adding 6mL of isobutene at-10 ℃ to start reaction, polymerizing for 40min,adding precooled methanol to terminate the reaction, simply decanting and collecting the product, washing the product for a plurality of times by using methanol, and drying the product in vacuum to obtain the final product. Of HR PIB of the synthesis product1The H NMR spectrum is shown in FIG. 1, and the GPC curve of HR PIB of the synthesized product is shown in FIG. 2.
Example 2
15mL of [ Bmim ] was added to the reactor][PF6]、0.55mL CH2Cl21.9mL of 1mol/L TiCl4And (3) adding and mixing the solution, uniformly mixing, placing the mixture in a cooling liquid for 5min, adding 10mL of isobutene to start reaction at the temperature of minus 10 ℃, after 40min of polymerization reaction, adding precooled methanol to stop the reaction, simply decanting and collecting a product, washing the product for multiple times by using methanol, and drying the product in vacuum to obtain a final product.
Example 3
24mL of [ Bmim ] was added to the reactor][PF6]、0.88mL CH2Cl21.04mL of 1mol/L BCl3And (3) adding and mixing the solution, uniformly mixing, placing the mixture in a cooling liquid for 5min, adding 16mL of isobutene to start reaction at the temperature of minus 10 ℃, after 40min of polymerization reaction, adding precooled methanol to stop the reaction, simply decanting, collecting a product, washing the product for multiple times by using methanol, and drying in vacuum to obtain a final product. Of HR PIB of the synthesis product1The H NMR spectrum is shown in FIG. 3, and the GPC curve of HR PIB of the synthesized product is shown in FIG. 4.
Example 4
3mL of [ Bmim ] was added to the reactor][PF6]、0.11mL CH2Cl20.38mL of 1mol/L BCl3And (3) adding and mixing the solution, uniformly mixing, placing the mixture in a cooling liquid for 5min, adding 2mL of isobutene to start reaction at the temperature of-10 ℃, after polymerization reaction for 30min, adding precooled methanol to stop the reaction, simply decanting and collecting a product, washing the product for multiple times by using methanol, and drying the product in vacuum to obtain a final product.
Example 5
3mL of [ Bmim ] was added to the reactor][BF4]、0.22mL CH2Cl20.26mL of 1mol/L TiCl4Mixing the solution while adding, coolingKeeping the solution constant for 5min, adding 2mL of isobutene to start reaction at-10 ℃, after 40min of polymerization reaction, adding precooled methanol to stop the reaction, simply decanting and collecting the product, washing the product with methanol for multiple times, and drying the product in vacuum to obtain the final product.
Example 6
9mL of [ Bmim ] was added to the reactor][BF4]、1.02mL CH2Cl21.74mL of 1mol/L BCl3And (3) adding and mixing the solution, uniformly mixing, placing the mixture in a cooling liquid for 5min, adding 6mL of isobutene to start reaction at the temperature of minus 20 ℃, after polymerization reaction for 30min, adding precooled methanol to stop the reaction, simply decanting and collecting a product, washing the product for multiple times by using methanol, and drying the product in vacuum to obtain a final product.
Example 7
27mL of [ Bmim ] was added to the reactor][BF4]、1.98mL CH2Cl22.34mL of 1mol/L BF3And (3) adding and mixing the solution, uniformly mixing, placing the mixture in a cooling liquid for 5min, adding 18mL of isobutene to start reaction at the temperature of minus 20 ℃, after polymerization reaction for 50min, adding precooled methanol to stop the reaction, simply decanting and collecting a product, washing the product for multiple times by using methanol, and drying the product in vacuum to obtain a final product. Of HR PIB of the synthesis product1The H NMR spectrum is shown in FIG. 5.
Example 8
15mL of [ Bmim ] was added to the reactor][Tf2N]、3mL CH2Cl21.8mL of 1mol/L BF3And (3) adding and mixing the solution, uniformly mixing, placing the mixture in a cooling liquid for 5min, adding 10mL of isobutene to start reaction at the temperature of minus 20 ℃, after 40min of polymerization reaction, adding precooled methanol to stop the reaction, simply decanting and collecting a product, washing the product for multiple times by using methanol, and drying the product in vacuum to obtain a final product.
Example 9
3mL of [ Bmim ] was added to the reactor][BF4]、0.22mL CH2Cl21.25mL of 0.4mol/L Et3Al3Cl3Mixing the solutions while adding, uniformly mixing, placing in cooling liquid for 5min, and adding at-15 deg.CAnd (3) adding 3mL of isobutene to start reaction, after polymerization reaction for 20min, adding precooled methanol to terminate the reaction, simply decanting and collecting the product, washing the product for multiple times by using methanol, and drying the product in vacuum to obtain the final product. Of HR PIB of the synthesis product1The H NMR spectrum is shown in FIG. 6.
Example 10
1.1mL of CH2Cl22.6mL of 0.4mol/L EtAlCl2After the solution is mixed evenly, the mixture is placed in cooling liquid for aging for 5min, and 30mL of [ Bmim ] is added into a reactor][PF6]Uniformly mixing, placing in a cooling liquid for 5min, adding 20mL of isobutene to start reaction at-15 ℃, after 50min of polymerization reaction, adding precooled methanol to stop reaction, simply decanting and collecting a product, washing the product for multiple times by using methanol, and drying in vacuum to obtain a final product.
Example 11
Adding 0.11mL of CH2Cl20.26mL of 1mol/L BF3After the solution is mixed evenly, the mixture is placed in cooling liquid for aging for 5min, and 3mL of [ Bmim ] is added into a reactor][Tf2N]Uniformly mixing, placing in a cooling liquid for 5min, adding 3mL of isobutene to start reaction at-15 ℃, after 20min of polymerization reaction, adding precooled methanol to stop the reaction, simply decanting and collecting a product, washing the product for multiple times by using methanol, and drying in vacuum to obtain a final product.
Example 12
0.24mL of CH2Cl20.52mL of 1mol/L BCl3After the solution is mixed evenly, the mixture is placed in cooling liquid for aging for 5min, and 6mL of [ Bmim ] is added into a reactor][Tf2N]Uniformly mixing, placing in a cooling liquid for 5min, adding 6mL of isobutene to start reaction at-15 ℃, after 40min of polymerization reaction, adding precooled methanol to stop reaction, simply decanting and collecting a product, washing the product for multiple times by using methanol, and drying in vacuum to obtain a final product.
The experimental data of the above examples are summarized in table 1.
TABLE 1 Experimental data sheet of examples
Figure BDA0001868290560000101
Figure BDA0001868290560000111

Claims (2)

1. A method for preparing high-activity polyisobutylene in an ionic liquid medium is characterized in that ionic liquid is adopted as a solvent, isobutylene is adopted as a raw material under the temperature condition of-7 to-20 ℃, and the concentration of a main initiator is 0.05 to 2 x 10- 3mol/L; preparing high-activity polyisobutylene through cationic polymerization in an initiation system with the concentration ratio of the coinitiator to the main initiator being 1-40 and in different feeding modes of the initiation system;
the number average molecular weight of the obtained high-activity polyisobutene is 500-5000g/mol, and the molecular weight distribution is 1.5-3.0; the conversion rate of isobutene is 50-100%; the content of exo-olefin terminal structure ranges from 70 to 99 mol%;
the different modes of addition are selected from the following modes 1 or 2:
mode 1 a high-activity polyisobutylene was prepared using separate feeds of a primary initiator and a co-initiator, comprising the steps of:
(1) feeding into a reactor: under the condition of-7 to-20 ℃,1 to 50ml of ionic liquid, initiator and coinitiator are added into a reactor, and each material needs to be uniformly mixed;
(2) polymer synthesis: under the condition of-7 to-20 ℃, adding l-30ml of isobutene into a reactor, carrying out polymerization reaction under stirring, adding precooled methanol to terminate the reaction after 10-60 min of polymerization reaction, simply decanting and collecting a product, washing the product for multiple times by using methanol, and carrying out vacuum drying to obtain high-activity polyisobutene;
in the mode 2, a main initiator and a coinitiator are mixed and then added into a reactor; or the main initiator and the coinitiator are mixed and aged and then added into a reactor to prepare the high-activity polyisobutene, comprising the following steps:
(1) initiator system configuration: fully mixing the coinitiator and the initiator according to the proportion of 1-40 of the coinitiator and the initiator, and aging at low temperature for 2-10 min;
(2) feeding into a reactor: under the condition of-7 to-30 ℃,1 to 50ml of ionic liquid and an initiator system are added into the reaction preparation and are uniformly mixed;
(3) polymer synthesis: under the condition of-7 to-30 ℃, adding l-30ml of isobutene into a reactor, carrying out polymerization reaction under stirring, adding precooled methanol to terminate the reaction after 10-60 min of polymerization reaction, simply decanting and collecting a product, washing the product for multiple times by using methanol, and carrying out vacuum drying to obtain high-activity polyisobutene;
the initiation system takes water as a main initiator, and the co-initiator is selected from EtAlCl2、Et3Al2Cl3、TiCl4、BF3、BCl3、FeCl3One of them;
the cation of the ionic liquid is selected from N, N' -dialkyl imidazole cation;
the anion of the ionic liquid is selected from: BF (BF) generator4 -、PF6 -、CF3COO-、CF3SO3 -、C4F9SO3 -、(CF3SO2)2N-、(C2F5SO2)2N-、(CF3SO2)3C-、SbF6 -、AsF6 -、EtSO4 -、MeSO4 -；
The monomer concentration of the isobutene is selected from 3-6 mol/L.
2. The process according to claim 1, characterized in that the cation of the ionic liquid is selected from the group consisting of 1-butyl-3-methylimidazolium cation;
the anion of the ionic liquid is selected from: BF (BF) generator4 -、PF6 -、CF3SO3 -、(CF3SO2)2N-。
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