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Magnetic attapulgite supported ionic liquid catalyst and preparation method thereof

A technology of ionic liquid and attapulgite, which is applied in the field of magnetic attapulgite-supported ionic liquid catalyst and its preparation, can solve the problems of reduced use efficiency, unstable performance, and inability to achieve complete recovery, and achieve enhanced binding force and excellent dispersion Sexuality, beneficial to the effect of oil catalytic reaction

Inactive Publication Date: 2016-07-20
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface of attapulgite contains a large number of polar hydroxyl groups and is negatively charged, which has a high surface energy, making it hydrophilic and oleophobic, and has poor compatibility and affinity to oils, so it is very difficult to use in organic reaction systems. Agglomeration is easy to occur, and the performance is unstable. Therefore, as an ionic liquid carrier material for catalytic grease, the surface property must be modified from hydrophilic to hydrophobic, and the dispersibility in organic solvents can be enhanced to make it excellent. performance is fully utilized
[0004] In addition, most of the ionic liquids supported by attapulgite are fine particle powders. The traditional filtration recovery method is time-consuming and laborious, and cannot achieve complete recovery, which reduces its use efficiency.

Method used

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  • Magnetic attapulgite supported ionic liquid catalyst and preparation method thereof
  • Magnetic attapulgite supported ionic liquid catalyst and preparation method thereof
  • Magnetic attapulgite supported ionic liquid catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Synthesis of silanized ionic liquids

[0036] Take 0.1mol of vinylimidazole and dissolve it in 60ml of toluene, slowly add 0.1mol of 1,3-propane sultone under the conditions of ice bath and vigorous stirring, after the dropwise addition, raise the temperature to 70°C, and stir it electrically for 2 hours to form a white solid , filtered the solid, washed 3 times with 60ml of ether, and dried the white solid in vacuum at 50°C for 4h to obtain 1,3-propane sultone imidazolium salt. Dissolve the white solid powder in water at 50°C, acidify by adding 0.1mol of sulfuric acid under vigorous mechanical stirring, then raise the temperature to 70°C, stir and react for 2 hours, evaporate the water in the reactant under vacuum after the reaction, and obtain light yellow oil Viscous liquid, after washing three times with 60ml ether, the final product was vacuum dried at 50°C for 24 hours, and then placed in a dry environment for later use;

[0037] Take 2.00 g of the above-prep...

Embodiment 2

[0047] Same as Example 1, the difference is:

[0048] The alkenyl imidazole compound is propenyl imidazole; the total mass of divalent iron and ferric iron ions and the mass of attapulgite are 0.40:1.

[0049] The test results of catalytic performance are as follows: the results show that the conversion rate of rapeseed oil reaches 94.4%. Compared with the catalytic effect of pure ionic liquid, the mass of ionic liquid is reduced by 40%, and the conversion rate of rapeseed oil is only reduced by 6%. After the reaction, the catalyst was recovered by filtration, and the catalyst was reused five times. The recovery rate of the catalyst reached 93.4%, the catalytic activity did not change much, and the conversion rate of rapeseed oil still reached 91.2%.

Embodiment 3

[0051] Same as Example 1, the difference is:

[0052] The sultone is 1,4-butane sultone. The total mass of ferrous iron and ferric iron ions and the mass of attapulgite are 0.08:1

[0053] The test results of catalytic performance are as follows: It was found that the conversion rate of rapeseed oil reached 93.1%. Compared with the catalytic effect of pure ionic liquid, the mass of ionic liquid was reduced by 37%, and the conversion rate of rapeseed oil was only reduced by 5%. After the reaction, the catalyst was recovered by filtration, and the catalyst was reused five times. The recovery rate of the catalyst reached 90.8%, the catalytic activity did not change much, and the conversion rate of rapeseed oil still reached 89.8%.

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Abstract

The invention discloses a magnetic attapulgite supported ionic liquid catalyst and a preparation method thereof. The catalyst is characterized in that ionic liquid is supported on magnetic attapulgite by means of bonding. The preparation method includes: using a silane coupling agent for modifying the ionic liquid; using a magnetic material for pretreatment of attapulgite to obtain modified attapulgite; supporting the ionic liquid modified by the silane coupling agent onto a magnetic attapulgite support. The magnetic attapulgite supported ionic liquid catalyst has the advantages of high stability, porosity, lipophilicity, dispersity and catalytic activity, recyclability and easiness in separation from products after catalysis of biodiesel.

Description

technical field [0001] The invention belongs to the field of catalysts, in particular to a magnetic attapulgite-supported ionic liquid catalyst and a preparation method thereof. Background technique [0002] With the emphasis on environmental protection and the shortage of petroleum resources, biodiesel technology has rapidly become a hot spot in the development of new energy sources in the world. Biodiesel is a long-chain fatty acid ester produced by transesterification of animal and vegetable oils and methanol, and is a high-quality substitute for petroleum diesel. At present, the main catalysts used are sulfuric acid or potassium hydroxide, strong acid and strong alkali, etc., and there are secondary pollution problems such as serious equipment corrosion and large amounts of industrial wastewater and waste residues. In recent years, the preparation of biodiesel catalyzed by ionic liquids has attracted widespread attention at home and abroad. As a new type of environment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02B01J35/12B01J35/04B01J35/10C10L1/02B01J35/27
CPCC10L1/02B01J31/0295C10L2200/0476B01J35/33B01J35/56B01J35/60B01J35/27Y02E50/10
Inventor 袁振宏苗长林吕鹏梅凡佩罗文李惠文杨玲梅刘姝娜庄新姝王忠铭
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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