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Immobilized ionic liquid solid acid catalyst and preparation method thereof

A technology of solid acid catalysts and ionic liquids, applied in physical/chemical process catalysts, carboxylate preparation, chemical instruments and methods, etc., can solve problems such as difficult stratification and inability to recycle, and achieve easy recycling, good catalytic effect, The effect of high yield

Inactive Publication Date: 2015-04-22
SHAOXING UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the recovery of ionic liquids during use, especially after reacting with polar alcohols and carboxylic acids, cannot be recovered because they will be dissolved in organic matter and difficult to separate.

Method used

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  • Immobilized ionic liquid solid acid catalyst and preparation method thereof
  • Immobilized ionic liquid solid acid catalyst and preparation method thereof
  • Immobilized ionic liquid solid acid catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of 3-Aminopropyltrimethoxysilane Ionic Liquid Solid Acid Catalyst Supported

[0029] Preparation of step 1 ylide

[0030] Take 3-aminopropyltrimethoxysilane and 1,4-butane sultone as raw materials, add tetrahydrofuran solvent, the amount is 6 times the mass of 3-aminopropyltrimethoxysilane, at 70 ℃ After heating and stirring for 2 hours, a white solid was obtained, which was then suction-filtered, washed three times with 99% diethyl ether, and vacuum-dried at 60°C to obtain the ylide;

[0031] Step 2 Acidification

[0032] Dissolve 1 g of ylide in 5 g of a mixed solvent of ethanol and water at a volume ratio of 1:1, add sulfuric acid equal to the substance of the ylide, and stir and mix at room temperature for 4 hours to obtain the corresponding anion as hydrogen sulfate. Ionic liquid solution;

[0033] Step 3 Synthesis of Immobilized Ionic Liquid Solid Acid Catalyst

[0034] Add chromatographic silica gel to the above ionic liquid solution, the amount o...

Embodiment 2-4

[0036] Except for the following differences, the others are the same as in Example 1, and the aminoalkyltrialkoxysilane is shown in Table 1, respectively, to obtain the following immobilized ionic liquid solid acid material catalyst.

[0037] Table 1 Aminoalkyltrialkoxysilane used in Examples 2-4 and catalyst parameters obtained

[0038]

Embodiment 5-6

[0040] Except following difference, all the other are with embodiment 1, and acid is shown in table 2 respectively, and the catalyst result that different acids obtain is as table 2.

[0041] The acid used in table 2 embodiment 5-6 and the catalyst parameter that obtains

[0042]

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Abstract

The invention provides an immobilized ionic liquid solid acid catalyst and a preparation method thereof. The preparation method comprises the following steps: reacting aminoalkyltrialkoxy silane with propanesultone or butanesultone to obtain trialkoxysilicon-containing ylid, acidifying by using an acid, adding a hydroxy group-containing carrier, and reacting to obtain the immobilized ionic liquid solid acid catalyst. The catalyst material has the advantages of high heat stability, high acid value of above 2.5mmol / g, large surface area, good catalysis effect, and repeated use.

Description

technical field [0001] The invention relates to the technical field of organic chemical synthesis, in particular to an immobilized ionic liquid solid acid catalyst and a preparation method thereof. Background technique [0002] In today's crisis of energy problems and environmental problems, it has become the goal of modern chemical industry to efficiently generate target products with a small amount of energy without producing unnecessary by-products. Acid catalysts are indispensable in the modern chemical industry and are widely used in the manufacture of various products such as pharmaceuticals, petrochemical products, and polymer products. However, most of the currently used liquid acid catalysts are hydrochloric acid and sulfuric acid. . The liquid catalyst used in the production process needs to be neutralized by alkali, and separated and recovered from the product by removing the salt generated by neutralization. However, a considerable amount of energy is consumed ...

Claims

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Application Information

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IPC IPC(8): B01J31/02B01J31/26C07C67/08C07C69/704C07C37/16C07C39/08C07C41/09C07C43/20
Inventor 何宁德梁学正
Owner SHAOXING UNIVERSITY
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