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A kind of crosslinking polymerization acidic ionic liquid alkylation catalyst and preparation method thereof

An acidic ionic liquid and cross-linking polymerization technology, which is applied in the direction of carbon compound catalysts, organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, etc., can solve the problem that active components are easy to fall off and catalysts are easy to deactivate and other problems, to achieve clear network structure, improve catalytic reaction efficiency, enhance the effect of acid sites and acid strength

Active Publication Date: 2021-03-23
江苏棋成化工有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the traditional carrier and immobilization methods solve the problem of recovery, the catalyst is easily deactivated because the active components are easy to fall off.

Method used

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  • A kind of crosslinking polymerization acidic ionic liquid alkylation catalyst and preparation method thereof
  • A kind of crosslinking polymerization acidic ionic liquid alkylation catalyst and preparation method thereof
  • A kind of crosslinking polymerization acidic ionic liquid alkylation catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0044] 25°C, N 2 Under atmosphere, 1.73g 4-halo-1-vinylpyrazole, 2.05g 1-vinyl-3-ethylimidazolium bromide, 2.60g crosslinking agent divinylbenzene, 0.19g azobisisobutyl Nitrile and 22.55 g of ethyl acetate were added to the reaction kettle and mixed evenly, and the temperature was raised to 80°C for 36 hours, and the ethyl acetate was distilled off under reduced pressure at 60°C, vacuum-dried at 40°C for 24 hours, and cooled to room temperature to obtain a cross-linked polymeric ionic liquid , put 2.63g of n-bromobutane and 25.95g of absolute ethanol into the reaction kettle, react at room temperature for 24h, filter, wash the filter cake with 23.70g of absolute ethanol each time, wash 3 times in total, and vacuum dry at 50°C for 8h to obtain Substitute cross-linked polymeric ionic liquid; at room temperature, add the substituted cross-linked polymeric ionic liquid, 18.34g 2mol / L toluene trifluoroacetic acid solution into the reaction kettle and soak for 24h, filter, and filte...

Embodiment example 2

[0047] 26°C, N 2 Under the atmosphere, 2.20g 4-iodo-1-vinylpyrazole, 3.74g 1-vinyl-3-butyl imidazolium bromide, 4.61g crosslinking agent divinylbenzene, 0.53g azobisisobutyl Nitrile and 26.77g of acetone were added to the reaction kettle and mixed evenly, and the temperature was raised to 80-120°C for 12-36 hours, the acetone was distilled off under reduced pressure at 60-100°C, vacuum-dried at 60°C for 12 hours, and cooled to room temperature to obtain crosslinking To polymerize ionic liquid, add 4.22g n-bromobutane and 30.91g absolute ethanol into the reaction kettle, react at room temperature for 12h, filter, wash the filter cake with 27.88g absolute ethanol each time, wash 4 times in total, and vacuum dry at 60°C 6h, to obtain a substituted cross-linked polymeric ionic liquid; at room temperature, add the substituted cross-linked polymeric ionic liquid, 25.11g 5mol / L toluene trifluoromethanesulfonate solution into the reactor and soak for 24h, filter, and use the filter ca...

Embodiment example 3

[0050] 20°C, N 2 Under the atmosphere, 2.60g 4-bromo-1-vinylpyrazole, 3.22g 1-vinyl-3-hexylimidazolium bromide, 5.63g crosslinking agent divinylbenzene, 0.92g dibenzoyl peroxide Add 32.77g of isopropanol into the reaction kettle and mix well, heat up to 100°C and react for 24h, distill under reduced pressure at 80°C to remove isopropanol, vacuum dry at 50°C for 20h, and cool down to room temperature to obtain a cross-linked polymeric ionic liquid , add 4.72g of n-bromohexane and 33.28g of absolute ethanol into the reaction kettle, react at room temperature for 20h, filter, wash the filter cake with 30.42g of absolute ethanol each time, wash 3 times in total, and vacuum dry at 80°C for 7h to obtain Substitute cross-linked polymeric ionic liquid; at room temperature, add the substituted cross-linked polymeric ionic liquid, 42.33g 1mol / L toluene trifluoroacetic acid solution into the reaction kettle for immersion for 36h, filter, and filter the cake with 35.49g anhydrous diethyl ...

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Abstract

The invention relates to a cross-linking polymerization acidic ionic liquid alkylating catalyst. The catalyst is obtained through the steps that a 4-halogenated-1-vinyl pyrazole monomer, 1-vinyl-3-alkyl imidazole bromide and crosslinkers crosslinkers are subjected to copolymerization to obtain cross-linking polymer ionic liquid, the cross-linking polymer ionic liquid reacts with halohydrocarbon toobtain substituted cross-linking polymer ionic liquid, and finally the substituted cross-linking polymer ionic liquid and organic acid are subjected to ion exchange to obtain the catalyst, wherein the general molecular formula is defined in the description, R1 is -CH2(CH2)2CH3 or -CH2(CH2)4CH3, R2 is -CH2(CH2)mCH3, m is 0, 2, 4 and 6, X is one of Cl, Br and I, Y<-> is SO3CF3<-> or CF3COO<->, thepolymerization degree is 2-50, a polymer b is 2-50, a polymer c is 2-50, and a polymer d is 2-50. Serving as a novel environmentally-friendly solid acid heterogenous catalyst for an alkylation reaction, the catalyst has the excellent catalytic performance, the catalytic efficiency can be effectively improved, and when styrene and o-xylene are catalyzed to generate the alkylation reaction, the yield of a diphenylethane product is larger than 90%.

Description

technical field [0001] The invention relates to a cross-linked polymeric acidic ionic liquid alkylation catalyst and a preparation method thereof. The cross-linked polymeric acidic ionic liquid can be used as a catalyst for industrial acid catalysis, especially for the alkylation of o-xylene and styrene Chemical reaction belongs to the catalyst preparation technology in the technical field of industrial catalysis. Background technique [0002] As a new type of environment-friendly liquid catalyst, ionic liquid has the characteristics of adjustable structure, high catalytic efficiency, recyclable use and high thermal stability. The preparation method is simple. However, its "liquid" feature greatly limits the possibility of structural modulation and hinders its further industrial application. Assembling some specific groups into the structure of ionic liquids through chemical reactions to prepare functional ionic liquids is one of the current research hotspots of ionic liqu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/06B01J35/10C07C2/74C07C15/18C08F212/36C08F226/06C08F8/00
CPCB01J31/0285B01J35/10B01J2231/32C07C2/74C07C2531/06C08F8/00C08F212/36C08F226/06C07C15/18
Inventor 李青高华颖南秋利刘永辉鲍杰华周钰明张一卫盛晓莉
Owner 江苏棋成化工有限公司
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