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Imidazole high-acidity ionic liquid catalyst and application thereof

A technology of ionic liquid and catalyst, which is applied in the field of green and renewable energy, can solve the problems of limited acidity of ionic liquid, restrict large-scale application, increase cost, etc., and achieve the effect of simplifying post-treatment process, reducing application cost and increasing acid density

Inactive Publication Date: 2012-08-01
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although there are currently many patents and papers on the preparation of biodiesel by acidic ionic liquid catalysis, the acidic ionic liquid involved is relatively small in acidic groups, and the acidity of the ionic liquid is limited, so that a relatively large amount of ionic liquid needs to be added in the catalytic reaction process, and then Increased cost restricts its large-scale application in industrialization

Method used

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  • Imidazole high-acidity ionic liquid catalyst and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: This imidazole strong acidic ionic liquid catalyst is bisimidazole butane sulfonic acid ionic liquid catalyst with hydrogen sulfate, and the chemical structural formula is as follows:

[0027] , where X is HSO 4 - , m=2; n=4.

[0028] The synthetic method of this ionic liquid catalyst is as follows:

[0029] 1) 0.5 mol imidazole and 0.5 mol sodium ethoxide were dissolved in 50 ml ethanol solvent, stirred and reacted at 70°C for 8 hours, the solvent ethanol was removed by rotary evaporation, washed with ether three times, dried in a vacuum oven for 12 hours, and an intermediate of sodium imidazole was obtained.

[0030] 2) Dissolve 0.5mol imidazole sodium and 0.25mol 1,2-dibromoethane in 50ml ethanol, mix well, stir and reflux for 10h, filter, wash the filtrate three times with ether, and vacuum dry to obtain bisimidazole intermediate.

[0031] 3) 0.5 mol of 1,4-sultone was added to the toluene solution of bis-imidazole, mixed and stirred for 8 hours,...

Embodiment 2

[0034] Embodiment 2: This imidazole strong acidic ionic liquid catalyst is dihydrogen phosphate diimidazole propane sulfonic acid ionic liquid catalyst, and the chemical structural formula is as follows:

[0035] , where X is H2 PO 4 - , m=2; n=3.

[0036] The synthetic method of this ionic liquid catalyst is as follows:

[0037] 1) 0.5 mol imidazole and 0.5 mol sodium ethoxide were dissolved in 50 ml ethanol solvent, stirred and reacted at 70°C for 8 hours, the solvent ethanol was removed by rotary evaporation, washed with ether three times, dried in a vacuum oven for 12 hours, and an intermediate of sodium imidazole was obtained.

[0038] 2) Dissolve 0.5mol imidazole sodium and 0.25mol 1,2-dibromoethane in 50ml ethanol, mix well, stir and reflux for 10h, filter, wash the filtrate three times with ether, and vacuum dry to obtain bisimidazole intermediate.

[0039] 3) 0.5 mol of 1,3-propane sultone was added to the toluene solution of bis-imidazole, mixed and stirred for ...

Embodiment 3

[0042] Embodiment 3: this imidazoles strongly acidic ionic liquid catalyst is bisimidazole butane sulfonic acid ionic liquid catalyst with hydrogen sulfate, and the chemical structural formula is as follows:

[0043] , where X is HSO 4 - , m=4; n=4.

[0044] The synthetic method of this ionic liquid catalyst is as follows:

[0045] 1) 0.5 mol imidazole and 0.5 mol sodium ethoxide were dissolved in 50 ml ethanol solvent, stirred and reacted at 70°C for 8 hours, the solvent ethanol was removed by rotary evaporation, washed with ether three times, dried in a vacuum oven for 12 hours, and an intermediate of sodium imidazole was obtained.

[0046] 2) Dissolve 0.5mol imidazole sodium and 0.25mol 1,4-dibromobutane in 50ml ethanol, mix well, stir and reflux for 10h, filter, wash the filtrate three times with ether, and vacuum dry to obtain bisimidazole intermediate.

[0047] 3) 0.5 mol of 1,4-sultone was added to the toluene solution of bis-imidazole, mixed and stirred for 8 ho...

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Abstract

The invention discloses an imidazole high-acidity ionic liquid catalyst, which is imidazole dication high-acidity ionic liquid. The ionic liquid catalyst has the advantages of being high in acid density, high in catalytic activity, short in catalyst reaction time, mild in reaction condition, simple in process, capable of being recycled, less in loss in use and the like, thereby being capable of being applied to preparation of biodiesel. Further, the ionic liquid catalyst is high in reaction speed, greatly shortens reaction time and mild in reaction condition.

Description

technical field [0001] The invention relates to an imidazole strongly acidic ionic liquid catalyst and application thereof, belonging to the technical field of green renewable energy. Background technique [0002] With the rapid development of the world economy, the demand for energy in various countries has increased sharply, and fossil fuels, as the main energy used by human beings, have been extensively exploited and utilized, which not only brings serious environmental pollution problems, but also has limited reserves. The future development of mankind and the inheritance of human civilization pose a severe test. Therefore, it is imminent to seek renewable energy and resources to replace the gradually depleted fossil fuels. Biodiesel is a long-chain fatty acid methyl ester produced by the transesterification reaction of animal and vegetable oil and methanol. It has the characteristics of easy biodegradation, high cetane number, safe storage and transportation, high ener...

Claims

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Application Information

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IPC IPC(8): B01J31/02C11C3/10
CPCY02E50/13Y02E50/10
Inventor 瞿广飞张军宁平施玉琨
Owner KUNMING UNIV OF SCI & TECH
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