Ionic liquid polymeric material as well as preparation method and application thereof

Abstract

The invention provides an ionic liquid polymeric material as well as a preparation method and application thereof, and belongs to the field of ionic liquid polymers. The method comprises the following steps: reacting alkenyl imidazole with halogenated alkylamine or / and halogenated hydrocarbon in a solvent to generate imidazolium ionic liquid; in the presence of a free radical initiator, carrying out free radical polymerization reaction on the imidazolium ionic liquid obtained in the step 1 and a comonomer to generate the imidazolium ionic liquid polymer. The invention also provides the imidazolium ionic liquid polymer obtained by the preparation method. The invention also provides application of the imidazolium ionic liquid polymer as an adsorbent in petroleum deacidification. According to the method, the advantages that the ionic liquid is not emulsified during deacidification and the like are reserved, the defects of introduction of impurities and the like are avoided, and meanwhile, the ionic liquid is directly polymerized to form the porous solid adsorbent, so that the adsorbent has a relatively large specific surface area and a large number of active adsorption sites and has relatively high adsorption activity.

Description

Technical Field

[0001] The invention belongs to the field of ionic liquid polymers, and in particular relates to an ionic liquid polymer material and a preparation method and application thereof. Background Art

[0002] The acidic components in petroleum generally refer to cyclopentane acid and other organic acids, inorganic acids, phenols, mercaptans, cyclopentane acid and other organic acids, collectively referred to as petroleum acids. Cyclopentane acid can account for up to 90% or even higher of the total amount of petroleum acids. Cyclopentane acid can react with iron to form ferrous cyclopentaneate, which causes corrosion of equipment during processing and affects the long-term stable operation of the device.

[0003] In order to alleviate the corrosion of cyclohexane acid, refineries generally use high-acid crude oil and low-acid crude oil blending, adding corrosion inhibitors, improving equipment material grade, etc. However, with the gradual reduction of crude oil resources worldwide and the invention and use of new mining technologies, crude oil continues to develop in the direction of high sulfur, high acidity, and heavy quality. The output of high-acid crude oil (acidity greater than 1mgKOH / g) is increasing at a rate of almost 0.3%. Therefore, it is no longer possible to simply meet the quality requirements of the final product by upgrading materials and physically mixing high and low acid fractions. Therefore, it is of particular practical significance to fundamentally deacidify crude oil and distillate oil.

[0004] Ionic liquids, also known as room temperature molten salts, are low-melting salt substances composed entirely of cations and anions. As an ionic, liquid material, ionic liquids exhibit unique physical and chemical properties. Ionic liquids are becoming one of the hot spots in petrochemical research and development with their own advantages. With the increase in their types and the improvement of their physical and chemical properties, their application in petrochemicals is becoming more and more extensive. In recent years, there have been many studies on the use of ionic liquids for oil deacidification, which can be roughly divided into two categories: one is to use ionic liquids to extract and separate cyclopentane acids in oil products, and the other is to use imidazole and cyclopentane acids to react to generate ionic liquids and separate them. Among them, the ionic liquids used in the study include N-alkyl imidazolium carbonate ionic liquids, tetraalkyl ammonium and tetraalkyl phosphonium hydroxide ionic liquids, and ionic liquids composed of diazabicycloundecene (DBU)-based cations and dicyanamide (DCN) anions.

[0005] Among the existing inventions, CN1810757A relates to a method for removing and recovering cyclohexane acid from oil products, which method is to select one of the imidazole derivatives or a 5%-60% alcohol solution thereof as a deacidifying agent, and to mix and react with the oil product at a ratio of 1:1-1:15 under the condition of 20-90°C. The cyclohexane acid in the oil product will react with the imidazole derivative to generate an ionic liquid. After the reaction is completed, the oil product phase with reduced acid value and the ionic liquid phase are separated quickly and efficiently by utilizing the large difference in polarity between the ionic liquid and the oil product. CN1847366A discloses a method for removing cyclohexane acid from crude oil or fractionated oil, which is to add at least one ionic liquid and / or auxiliary compound to the crude oil or fractionated oil, mix and react at 20-80°C, and stand and separate to obtain deacidified crude oil or fractionated oil. Since ionic liquids and auxiliary compounds have good solubility with crude oil and distillate oil, in the literature "Study on the Deacidification Effect of High-acid Crude Oil Based on Ionic Liquids", Shi Lijuan et al. used imidazole and cyclopentane acid to react to generate ionic liquids with large polarity difference from crude oil and easy to separate. Remove cyclopentane acid from crude oil. The effects of imidazole content, agent-oil ratio, reaction time, reaction temperature and stirring rate on the primary deacidification effect of high-acid crude oil were investigated, and the deacidification effect of three-stage countercurrent extraction was further investigated under the selected primary deacidification reaction conditions. The results show that under the conditions of imidazole content of 30%, agent-oil mass ratio of 0.4, reaction time of 5min, reaction temperature of 30℃ and stirring rate of 300r / min, the primary deacidification rate of Beijiang crude oil can reach 61.5%, the primary deacidification rate of Penglai crude oil with lower acid value can reach 68.6%, and the primary deacidification rates of No. 1 and No. 2 blending oils with lower acid values ​​reach 70.6% and 72.2% respectively. For the four crude oils used in the experiment, when the agent-oil mass ratio was 0.1, the acid removal rate of the three-stage countercurrent extraction could be increased to about 75%; when the agent-oil mass ratio increased to 0.6, the acid removal rate of the three-stage countercurrent extraction could reach more than 84%.

[0006] The deacidification method of ionic liquid has a high deacidification rate, avoids the introduction of a large amount of water, does not have emulsification problems, and has a high solvent recovery rate, and can be operated in a continuous cycle. At the same time, the separation process conditions are mild, the energy consumption is low, the separation process does not use corrosive alkali solution, the oil loss is small, clean separation is achieved, and the corrosion to the equipment is small. However, the use of ionic liquid deacidification still requires the addition of an agent-oil phase separation process, which makes the operation cumbersome, increases equipment investment, and is easy to introduce impurities into the oil.

[0007] In the existing invention technology, CN103237871A discloses a method for removing cyclopentane acid from crude oil and crude oil distillate, which mainly realizes the immobilization of ionic liquid by loading alkaline ionic liquid on a carrier such as silica, and then removes cyclopentane acid from crude oil by solid phase extraction. This method effectively avoids the disadvantages of the above-mentioned ionic liquid liquid phase extraction deacidification method, but the silica carrier occupies most of the volume of the solid phase adsorbent, and the cyclopentane acid is mainly adsorbed by the loaded ionic liquid group. Summary of the invention

[0008] The purpose of the present invention is to provide an imidazole ionic liquid polymer and a preparation method and application thereof, which continues the advantages of ionic liquids in oil deacidification and makes the subsequent separation process simpler and more efficient through immobilization.

[0009] In order to achieve the above object, the present invention provides the following technical solutions:

[0010] The present invention first provides a method for preparing an imidazole ionic liquid polymer, the method comprising:

[0011] Step 1: reacting alkenyl imidazole with halogenated alkylamine or / and halogenated hydrocarbon in a solvent to generate an imidazole ionic liquid;

[0012] Step 2: In the presence of a free radical initiator, the imidazole ionic liquid of step 1 is subjected to a free radical polymerization reaction with a comonomer to generate an imidazole ionic liquid polymer.

[0013] Preferably, the vinyl imidazole in step 1 is 1-vinylimidazole, 2-vinylimidazole, 2-methyl-1-vinylimidazole, N-allylimidazole, 2-phenylvinyl-1H-imidazole or 2-vinyl-(9ci)-1H-benzimidazole.

[0014] Preferably, the haloalkylamine in step 1 is 3-chloropropylamine, 4-chlorobutylamine, 4-bromo-1-butylamine or 5-bromopentylamine.

[0015] Preferably, the halogenated hydrocarbon in step 1 is 1-bromooctane, 1-chlorodecane, 1-bromododecane or 1-bromohexadecane.

[0016] Preferably, the reaction temperature in step 1 is 20-100° C., and the reaction time is 1-48 h.

[0017] Preferably, the comonomer in step 2 is styrene, divinylbenzene, vinylpyridine or vinylnaphthalene.

[0018] Preferably, the free radical initiator in step 2 is azobisisobutyronitrile, azobisisoheptanenitrile, isopropylbenzene hydroperoxide, tert-butyl hydroperoxide, dibenzoyl peroxide, cyclohexanone peroxide, di-tert-butyl peroxide or diisopropylbenzene peroxide.

[0019] Preferably, the temperature of the free radical polymerization reaction in step 2 is 20-100° C., and the reaction time is 1-48 h.

[0020] The present invention also provides an imidazole ionic liquid polymer obtained by the above preparation method.

[0021] The present invention also provides the use of the imidazole ionic liquid polymer as an adsorbent in petroleum deacidification.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] (1) The present invention makes it easier to separate the oil product from the adsorbent by immobilizing the ionic liquid, thereby avoiding the liquid phase extractant from remaining in the oil product and introducing impurities.

[0024] (2) The ionic liquid polymer prepared by the present invention has a large specific surface area and a large number of active adsorption sites, and can more effectively adsorb cyclohexane acid in oil products.

[0025] (3) The present invention copolymerizes ionic liquid with polymer monomers such as styrene to adjust the lipophilicity of the polymer, so that the oil can infiltrate the surface of the adsorbent and promote interphase mass transfer.

[0026] (4) When the present invention uses ionic liquid to remove acidic compounds in crude oil or distillate oil, it is not easy to emulsify and is easy to complex with acid to generate corresponding ionic liquid-acid complex, which can be separated from crude oil or distillate oil after standing, thereby achieving separation from crude oil or distillate oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is the infrared spectrum of the polyionic liquid PILs-1 prepared in Example 1 of the present invention. DETAILED DESCRIPTION

[0028] The present invention first provides a method for preparing an imidazole ionic liquid polymer, the method comprising:

[0029] Step 1: reacting alkenyl imidazole with halogenated alkylamine or / and halogenated hydrocarbon in a solvent to generate an imidazole ionic liquid after purification; the reaction temperature is preferably 20-100°C, more preferably 60°C, and the reaction time is preferably 1-48h, more preferably 24h; the molar ratio of alkenyl imidazole to halogenated alkylamine or / and halogenated hydrocarbon is preferably (0.01-100):1, more preferably 1:1.

[0030] The vinyl imidazole is preferably 1-vinylimidazole, 2-vinylimidazole, 2-methyl-1-vinylimidazole, N-allylimidazole, 2-phenylvinyl-1H-imidazole, 2-vinyl-(9ci)-1H-benzimidazole, and more preferably 1-vinylimidazole.

[0031] The halogenated alkylamine is preferably 3-chloropropylamine, 4-chlorobutylamine, 4-bromo-1-butylamine or 5-bromopentylamine, more preferably 4-chlorobutylamine; the halogenated hydrocarbon is preferably 1-bromooctane, 1-chlorodecane, 1-bromododecane or 1-bromohexadecane, more preferably 1-bromododecane.

[0032] The solvent is preferably methanol, ethanol, isopropanol, dichloromethane, chloroform, tetrahydrofuran, benzene, toluene, xylene, N,N-dimethylformamide, N,N-dimethylsulfoxide, more preferably isopropanol.

[0033] Step 2: In the presence of a free radical initiator, the imidazole ionic liquid of step 1 is subjected to a free radical polymerization reaction with a comonomer, and an imidazole ionic liquid polymer is generated after purification; the temperature of the free radical polymerization reaction is preferably 20-100° C., more preferably 60° C., and the reaction time is preferably 1-48 h, more preferably 24 h; the molar ratio of the alkenyl imidazole to the comonomer is preferably (0.01-100):1, and the molar ratio of the alkenyl imidazole to the free radical initiator is preferably (0.01-100):1. The solvent used in the reaction process is preferably N,N-dimethylformamide. Before use, the solvent is preferably purified to remove trace amounts of water in the solvent.

[0034] The comonomer is preferably styrene, divinylbenzene, vinylpyridine or vinylnaphthalene, more preferably styrene.

[0035] The free radical initiator is preferably azobisisobutyronitrile, azobisisoheptanenitrile, cumene hydroperoxide, tert-butyl hydroperoxide, dibenzoyl peroxide, cyclohexanone peroxide, di-tert-butyl peroxide or dicumyl peroxide, more preferably azobisisobutyronitrile.

[0036] The present invention also provides an imidazole ionic liquid polymer obtained by the above preparation method.

[0037] The present invention also provides the use of the imidazole ionic liquid polymer as an adsorbent in petroleum deacidification.

[0038] The present invention prepares a solid deacidifying agent by polymerizing imidazole ionic liquid monomers to generate solid polymers, which not only retains the advantages of ionic liquid deacidification without emulsification, but also avoids the disadvantages of introducing impurities. At the same time, the ionic liquid is directly polymerized to form a porous solid adsorbent, so that the adsorbent has a larger specific surface area and a large number of active adsorption sites, and has higher adsorption activity than methods such as loading ionic liquids on carriers.

[0039] The present invention is further described below in conjunction with examples, wherein Examples 1-5 are the synthesis of imidazole ionic liquid polymers, and Examples 6-10 are the deacidification effect tests of ionic liquid polymer materials.

[0040] Example 1

[0041] Add 4-chlorobutylamine and 1-vinylimidazole in a molar ratio of 1:1 into a flask, use isopropanol as solvent, and react at 60°C for 24 hours. After the reaction is completed, the isopropanol is evaporated off, the product is washed with anhydrous ether for several times, and then the ether is evaporated off to obtain a yellow viscous liquid, which is 1-(4-amino)butyl-3-vinylimidazole chloride ionic liquid.

[0042] N,N-dimethylformamide was purified by adding anhydrous magnesium sulfate, stirring with a magnetic bar overnight, and distilling under reduced pressure to obtain purified N,N-dimethylformamide.

[0043] The prepared 1-(4-amino)butyl-3-vinylimidazole chloride ionic liquid was mixed with styrene in a molar ratio of 1:1, N,N-dimethylformamide was used as solvent, azobisisobutyronitrile was added, N2 was bubbled in for 20 minutes, and the reaction was carried out at 60°C for 24 hours. After the reaction, the reaction mixture was poured into ethyl acetate, and a white solid precipitated immediately. The solid was separated by centrifugation, and then the solid was washed with ethyl acetate for several times and vacuum dried at 45°C for 12 hours to obtain the purified polyionic liquid PILs-1.

[0044] Figure 1 This is the infrared spectrum of the polyionic liquid PILs-1 prepared in Example 1 of the present invention. As can be seen from the figure, 2925cm -1 and 2730cm -1 The absorption peaks are the stretching vibration peaks of CH3- and CH2-, 3127cm -1 and 3028cm -1 The peak at 3457cm is the vibration peak of CH on the unsaturated carbon. Since its peak is small, it may be caused by a very small amount of unreacted styrene residue. Overall, the polymerization of the ionic liquid monomer is relatively sufficient. -1 NH stretching vibration peak, 650-900cm -1 The peak at 1613 cm is the bending vibration peak of NH.-1 The peak at 1452 cm may be the C=O stretching vibration peak in the residual solvent DMF. -1 The peak at 1514 cm is the skeleton vibration peak of the imidazole ring. -1 It is the stretching vibration absorption peak of the imidazole ring, which indicates the presence of a large number of primary amine groups in the polymer, which matches the molecular structure we designed and reflects the successful preparation of polyionic liquid PILs-1.

[0045] Example 2

[0046] Add 5-bromopentylamine and 1-vinylimidazole in a molar ratio of 1:1 into a flask, use isopropanol as solvent, and react at 60°C for 24 hours. After the reaction is completed, the isopropanol is evaporated off, the product is washed with anhydrous ether for several times, and then the ether is evaporated off to obtain a yellow viscous liquid, which is 1-(5-amino)pentyl-3-vinylimidazole bromide ionic liquid.

[0047] N,N-dimethylformamide was purified by adding anhydrous magnesium sulfate, stirring with a magnetic bar overnight, and distilling under reduced pressure to obtain purified N,N-dimethylformamide.

[0048] The prepared 1-(5-amino)pentyl-3-vinyl imidazolium bromide ionic liquid was mixed with styrene in a molar ratio of 1:1, N, N-dimethylformamide was used as solvent, azobisisobutyronitrile was added, N2 was bubbled in for 20 minutes, and the reaction was carried out at 60°C for 24 hours. After the reaction, the reaction mixture was poured into ethyl acetate, and a white solid precipitated immediately. The solid was separated by centrifugation, and then the solid was washed with ethyl acetate for several times and vacuum dried at 45°C for 12 hours to obtain the purified polyionic liquid PILs-2.

[0049] Example 3

[0050] Add 4-chlorobutylamine and N-allylimidazole in a molar ratio of 1:1 to a flask, use isopropanol as solvent, and react at 60°C for 24 hours. After the reaction is completed, the isopropanol is evaporated off, the product is washed with anhydrous ether for several times, and then the ether is evaporated off to obtain a yellow viscous liquid, which is 1-(4-amino)butyl-3-allylimidazole chloride ionic liquid.

[0051] N,N-dimethylformamide was purified by adding anhydrous magnesium sulfate, stirring with a magnetic bar overnight, and distilling under reduced pressure to obtain purified N,N-dimethylformamide.

[0052] The prepared 1-(4-amino)butyl-3-allylimidazolium chloride ionic liquid was mixed with styrene in a molar ratio of 1:1, N,N-dimethylformamide was used as solvent, azobisisobutyronitrile was added, N2 was bubbled in for 20 minutes, and the reaction was carried out at 60°C for 24 hours. After the reaction, the reaction mixture was poured into ethyl acetate, and a white solid precipitated immediately. The solid was separated by centrifugation, and then the solid was washed with ethyl acetate for several times and vacuum dried at 45°C for 12 hours to obtain the purified polyionic liquid PILs-3.

[0053] Example 4

[0054] Add 4-chlorobutylamine, 1-bromododecane, and 1-vinylimidazole in a molar ratio of 1:1:2 to a flask, use isopropanol as solvent, and react at 60°C for 24 hours. After the reaction is completed, the isopropanol is evaporated off, the product is washed with anhydrous ether for several times, and then the ether is evaporated off to obtain a yellow viscous liquid, which is a vinyl imidazole chloride ionic liquid.

[0055] N,N-dimethylformamide was purified by adding anhydrous magnesium sulfate, stirring with a magnetic bar overnight, and distilling under reduced pressure to obtain purified N,N-dimethylformamide.

[0056] The prepared vinyl imidazolium chloride ionic liquid was mixed with styrene in a molar ratio of 1:1, N, N-dimethylformamide was used as solvent, azobisisobutyronitrile was added, N2 was bubbled in for 20 minutes, and the reaction was carried out at 60°C for 24 hours. After the reaction was completed, the reaction mixture was poured into ethyl acetate, and a white solid was immediately precipitated. The solid was separated by centrifugation, and then the solid was washed with ethyl acetate for several times, and vacuum dried at 45°C for 12 hours to obtain the purified polyionic liquid PILs-4.

[0057] Example 5

[0058] Add 4-chlorobutylamine and 1-vinylimidazole in a molar ratio of 1:1 to a flask, use isopropanol as solvent, and react at 60°C for 24 hours. After the reaction is completed, the isopropanol is evaporated off, the product is washed with anhydrous ether for several times, and then the ether is evaporated off to obtain a yellow viscous liquid, which is 1-(4-amino)butyl-3-vinylimidazole chloride ionic liquid.

[0059] N,N-dimethylformamide was purified by adding anhydrous magnesium sulfate, stirring with a magnetic bar overnight, and distilling under reduced pressure to obtain purified N,N-dimethylformamide.

[0060] The prepared 1-(4-amino)butyl-3-vinylimidazolium chloride ionic liquid was mixed with vinylpyridine in a molar ratio of 1:1, N,N-dimethylformamide was used as solvent, azobisisobutyronitrile was added, N2 was bubbled in for 20 minutes, and the reaction was carried out at 60°C for 24 hours. After the reaction was completed, the reaction mixture was poured into ethyl acetate, and a white solid precipitated immediately. The solid was separated by centrifugation, and then the solid was washed with ethyl acetate for several times, and vacuum dried at 45°C for 12 hours to obtain the purified polyionic liquid PILs-5.

[0061] Example 6

[0062] First, weigh 5 g of polyionic liquid PILs-1 and place it in a flask, and add 500 g of Shengli crude oil; start stirring to make PILs-1 evenly dispersed in the crude oil, the stirring speed is 100 rpm, and after stirring for 5 minutes, start heating until the oil temperature rises to 80°C; when the temperature is kept at 80°C for 30 and 60 minutes, take samples and use filter paper for solid-liquid separation to obtain oil samples, and determine the acid value of the oil samples by potentiometric titration.

[0063] Example 7

[0064] First, weigh 5g of polyionic liquid PILs-2 and place it in a flask, and add 500g of Shengli crude oil; start stirring to make PILs-2 evenly dispersed in the crude oil, the stirring speed is 100rpm, and after stirring for 5 minutes, start heating until the oil temperature rises to 80°C; when the temperature is kept at 80°C for 30 and 60 minutes, take samples and use filter paper for solid-liquid separation to obtain oil samples, and determine the acid value of the oil samples by potentiometric titration.

[0065] Example 8

[0066] First, weigh 5 g of polyionic liquid PILs-3 and place it in a flask, and add 500 g of Shengli crude oil; start stirring to make PILs-3 evenly dispersed in the crude oil, the stirring speed is 100 rpm, and after stirring for 5 minutes, start heating until the oil temperature rises to 80°C; when the temperature is kept at 80°C for 30 and 60 minutes, take a sample and use filter paper for solid-liquid separation to obtain an oil sample, and determine the acid value of the oil sample by potentiometric titration.

[0067] Example 9

[0068] First, 5 g of polyionic liquid PILs-4 was weighed and placed in a flask, and 500 g of Shengli crude oil was added; stirring was started to make PILs-4 evenly dispersed in the crude oil, the stirring speed was 100 rpm, and after stirring for 5 minutes, heating was started until the oil temperature rose to 80°C; when the temperature was kept at 80°C for 30 and 60 minutes, sampling was performed and filter paper was used for solid-liquid separation to obtain an oil sample, and the acid value of the oil sample was determined by potentiometric titration.

[0069] Example 10

[0070] First, weigh 5g of polyionic liquid PILs-5 and place it in a flask, and add 500g of Shengli crude oil; start stirring to make PILs-5 evenly dispersed in the crude oil, the stirring speed is 100rpm, and after stirring for 5 minutes, start heating until the oil temperature rises to 80°C; when the temperature is kept at 80°C for 30 and 60 minutes, take samples and use filter paper for solid-liquid separation to obtain oil samples, and determine the acid value of the oil samples by potentiometric titration.

[0071] Table 1 gives the acid values ​​of the raw materials and samples in Examples 6-10.

[0072] Table 1 Acid value analysis results before and after deacidification reaction

[0073]

[0074] The embodiments of the present invention are described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for preparing an imidazole ionic liquid polymer, characterized in that: The method includes: Step 1: reacting alkenyl imidazole with halogenated alkylamine or / and halogenated hydrocarbon in a solvent to generate an imidazole ionic liquid; Step 2: In the presence of a free radical initiator, the imidazole ionic liquid of step 1 is subjected to a free radical polymerization reaction with a comonomer to generate an imidazole ionic liquid polymer.

2. The method for preparing an imidazole ionic liquid polymer according to claim 1, characterized in that: The vinyl imidazole in step 1 is 1-vinylimidazole, 2-vinylimidazole, 2-methyl-1-vinylimidazole, N-allylimidazole, 2-phenylvinyl-1H-imidazole or 2-vinyl-(9ci)-1H-benzimidazole.

3. The method for preparing an imidazole ionic liquid polymer according to claim 1, characterized in that: The haloalkylamine described in step 1 is 3-chloropropylamine, 4-chlorobutylamine, 4-bromo-1-butylamine or 5-bromopentylamine.

4. The method for preparing an imidazole ionic liquid polymer according to claim 1, characterized in that: The halogenated hydrocarbon in step 1 is 1-bromooctane, 1-chlorodecane, 1-bromododecane or 1-bromohexadecane.

5. The method for preparing an imidazole ionic liquid polymer according to claim 1, characterized in that: The reaction temperature in step 1 is 20-100° C., and the reaction time is 1-48 hours.

6. The method for preparing an imidazole ionic liquid polymer according to claim 1, characterized in that: The comonomer in step 2 is styrene, divinylbenzene, vinylpyridine or vinylnaphthalene.

7. The method for preparing an imidazole ionic liquid polymer according to claim 1, characterized in that: The free radical initiator described in step 2 is azobisisobutyronitrile, azobisisoheptanenitrile, isopropylbenzene hydroperoxide, tert-butyl hydroperoxide, dibenzoyl peroxide, cyclohexanone peroxide, di-tert-butyl peroxide or diisopropylbenzene peroxide.

8. The method for preparing an imidazole ionic liquid polymer according to claim 1, characterized in that: The temperature of the free radical polymerization reaction in step 2 is 20-100° C., and the reaction time is 1-48 hours.

9. The imidazole ionic liquid polymer obtained by the preparation method according to claim 1.

10. Use of the imidazole ionic liquid polymer according to claim 9 as an adsorbent in petroleum deacidification.

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