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Method for preparing self-curing ionic liquid

An ionic liquid and self-curing technology, applied in chemical instruments and methods, liquid carbon-containing fuels, fatty acid esterification, etc., can solve problems such as inability to recycle, complicated preparation process, and restrictions on large-scale use

Inactive Publication Date: 2019-01-11
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Similarly, it also has the problem of using highly corrosive acid, complex process, and unrecoverable catalyst
[0006] To sum up, in the actual industrial process such as biodiesel production, ionic liquid has good performance as a homogeneous catalyst, but it has the outstanding problems of complicated preparation process and inability to recycle after use, and is generally accompanied by high corrosion. The use of concentrated sulfuric acid
These problems greatly limit the large-scale use of traditional ionic liquids

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The methanol solution of polyethyleneimine with a mass fraction of 5wt% was added dropwise to 1,3-propane sultone (PS) (the molar ratio of polyethyleneimine to 1,3-propane sultone was controlled to 1:1), reacted at 30°C for 4h, and after the reaction, filtered, washed, and dried (drying temperature was 60°C, drying time was 9h) to obtain a self-curing ionic liquid with an acid value of 1.50mmol / g.

[0020] Add methanol and oleic acid to the reactor at an alkyd molar ratio of 10:1, then add the above-mentioned ionic solid catalyst, the amount of catalyst added is 2.0% of the mass of oleic acid, the reaction temperature is 60°C, and the reaction is 1 hour to obtain biodiesel The crude product was then subjected to vacuum distillation to separate methanol to obtain the refined product biodiesel, and the yield of biodiesel was calculated by gas chromatography analysis, and the yield of biodiesel was 93.31%.

Embodiment 2

[0022] The acetonitrile solution of polyethyleneimine with a mass fraction of 10wt% was added dropwise to 1,3-propane sultone (PS) (controlling the molar ratio of polyethyleneimine to 1,3-propane sultone 1 :2), react at a temperature of 40°C for 2h, after the reaction, filter, wash, and dry (the drying temperature is 70°C, the drying time is 6h) to obtain a self-curing ionic liquid, and its acid value is 1.62mmol / g .

[0023] The prepared catalyst was used to prepare biodiesel from oleic acid and methanol under the same application conditions as in Example 1, and the final yield of biodiesel was 96.56%.

Embodiment 3

[0025] The N-methylpyrrolidone solution of polyethyleneimine with a mass fraction of 50wt% was added dropwise to 1,3-propane sultone (PS) (controlling polyethyleneimine and 1,3-propane sultone The molar ratio is 1:3), reacted at 30°C for 3h, and after the reaction was completed, the self-curing ionic liquid was obtained by suction filtration, washing, and drying (drying temperature was 30°C, drying time was 12h), and its acid value It is 1.70 mmol / g.

[0026] The prepared catalyst was used to prepare biodiesel from oleic acid and methanol under the same application conditions as in Example 1, and the yield of biodiesel was 97.71%.

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PUM

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Abstract

The invention discloses a method for preparing a self-curing ionic liquid. The preparation method comprises the following steps: reacting polyethyleneimine serving as a matrix with 1,3-propane sultoneor 1,4-butyl sultone by a one-step method, and performing suction filtering, washing and drying to prepare an ionic liquid product, wherein the molar ratio of the polyethyleneimine to the 1,3-propanesultone or 1,4-butyl sultone is 1:1-1:10. The method is simple in process and low in cost, the self-curing ionic liquid which serves as a heterogeneous catalyst and is applied to biodiesel productionby ester exchange has excellent catalytic activity and repeated use stability, can be reclaimed conveniently after reaction, and has a large-scale application prospect.

Description

technical field [0001] The invention relates to a preparation method of a self-curing ionic liquid, belonging to the technical field of acid catalyst preparation. Background technique [0002] Fossil fuel is currently the main energy source in the world, but its depletion and pollution have aroused global concern. At present, it is imminent to seek a green, renewable and clean energy to replace fossil fuels. Biodiesel is a renewable and clean energy with advantages such as high cetane number, low CO emission and high flash point. At present, acid-base catalysis, bio-enzyme catalysis, supercritical catalysis and catalytic hydrogenation are generally used in the industry to prepare biodiesel. Traditional basic catalysts have high catalytic performance, but there are problems such as difficult recovery, and it is easy to undergo saponification reaction with free fatty acids in raw oil, which complicates the subsequent separation process; traditional strong acid catalysts can ...

Claims

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Application Information

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IPC IPC(8): B01J31/02C10L1/02C11C3/04
CPCB01J31/0294C10L1/02C11C3/04Y02E50/10
Inventor 邱挺陈志文林小城李玲叶长燊王红星杨臣
Owner FUZHOU UNIV
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