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Preparation method and application of Al2O3-modified SO4<2->/SnO2 solid acid catalyst

A solid acid catalyst and modification technology, which is applied in the direction of catalyst activation/preparation, organic compound preparation, physical/chemical process catalysts, etc., can solve the problems of increasing operating units, excessive waste water, equipment corrosion, etc., and achieve good reaction effect, Effect of reducing pollution and improving production efficiency

Inactive Publication Date: 2018-11-02
INST OF CHEM CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the condensation reaction of prenyl aldehyde and prenol, the traditional method is mainly to use medium-strength liquid acids such as phosphoric acid for acid-catalyzed reaction, but using these liquid acids not only has problems such as equipment corrosion, but also requires Further neutralization and water washing can remove the residual catalyst in the system, increase the operating unit, and generate more waste water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: 35.07g SnCl 4 ·5H 2 Dissolve O in 200ml of water. After fully dissolving, disperse the solution in 200ml of ethanol, slowly add concentrated ammonia water dropwise under stirring condition until pH=8~10, stop adding concentrated ammonia water. Static aging at room temperature for 1.0 h, the precipitate was centrifuged and filtered, and then washed with a solution of ethanol: water at a ratio of 1:1 until the filtrate did not contain Cl - ions, the filter cake was drained, and the obtained filter cake was dried at 110°C for about 12h, then soaked in 3mol / L sulfuric acid for 0.5h, filtered after impregnation, dried at 110°C for 20h, and then calcined at 550°C for 3h in an air atmosphere to obtain Catalyst, code-named CAT-1.

Embodiment 2

[0027] Embodiment 2: with 35.07g SnCl 4 ·5H 2 O and 1.875g Al(NO 3 ) 3 9H 2 Dissolve O in 200ml of water. After fully dissolving, disperse the solution in 200ml of ethanol, slowly add concentrated ammonia water dropwise under stirring condition until pH=8~10, stop adding concentrated ammonia water. Static aging at room temperature for 1.0 h, the precipitate was centrifuged and filtered, and then washed with a solution of ethanol: water at a ratio of 1:1 until the filtrate did not contain Cl - ions, the filter cake was drained, and the obtained filter cake was dried at 110°C for about 12h, then soaked in 3mol / L sulfuric acid for 0.5h, filtered after impregnation, dried at 110°C for 20h, and then calcined at 550°C for 3h in air atmosphere to obtain the catalyst , codenamed CAT-2.

Embodiment 3

[0028] Embodiment 3: with 35.07g SnCl 4 ·5H2 O and 3.75g Al(NO 3 ) 3 9H 2 Dissolve O in 200ml of water. After fully dissolving, disperse the solution in 200ml of ethanol, slowly add concentrated ammonia water dropwise under stirring condition until pH=8~10, stop adding concentrated ammonia water. Static aging at room temperature for 1.0 h, the precipitate was centrifuged and filtered, and then washed with a solution of ethanol: water at a ratio of 1:1 until the filtrate did not contain Cl - ions, the filter cake was drained, and the obtained filter cake was dried at 110°C for about 12h, then soaked in 3mol / L sulfuric acid for 0.5h, filtered after impregnation, dried at 110°C for 20h, and then calcined at 550°C for 3h in air atmosphere to obtain the catalyst , codenamed CAT-3.

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Abstract

The invention discloses a preparation method of an Al2O3-modified SO4<2-> / SnO2 solid acid catalyst and application thereof to an aldol reaction. At present, in the aldol reaction of isopentenyl aldehyde and isopentenyl alcohol, an acid-catalyzed reaction is performed by using liquid acid such as phosphoric acid, so that operating units are increased and more wastewater is produced. The preparationmethod of the solid acid catalyst comprises the following steps: a), dissolving soluble aluminum salt and soluble tin salt in water, and dispersing in an alcohol compound; b), dropwise adding an alkaline compound, leaving to stand for aging at room temperature, and filtering; c), immersing in sulfuric acid, and then filtering; d), calcinating in an air atmosphere. Through use of the solid acid catalyst, the time of the condensation reaction is significantly shortened and the conversion rate is significantly increased; in addition, the catalyst can be reused after being filtered, and the original activity thereof is still maintained without a deactivation phenomena, so that not only the production efficiency is greatly improved, but also the environmental pollution is reduced.

Description

technical field [0001] The invention relates to the technical field of catalysts, more specifically an Al 2 o 3 Modified SO 4 2- / SnO 2 The preparation method of the solid acid catalyst and the application of the prepared solid acid catalyst in the aldol condensation reaction. Background technique [0002] In chemical production, acid catalysis is a very common and important reaction. Traditionally, H 2 SO 4 、H 3 PO 4 , HF and AlCl 3 Such catalysts are used for acid-catalyzed reactions, but such catalysts have disadvantages such as large pollution and easy corrosion of reaction equipment. Therefore, people urgently need to find an environmentally friendly catalyst to replace the traditional catalyst with relatively heavy pollution and realize green production. SO 4 2- The supported oxide-type solid superacid can activate various chemical bonds at a relatively low temperature. It has the advantages of high activity and high selectivity of liquid acid and the repro...

Claims

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Application Information

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IPC IPC(8): B01J27/053B01J37/08B01J37/02C07C41/56C07C43/303
CPCB01J27/053B01J37/0201B01J37/088C07C41/56C07C43/303
Inventor 宋卫国翟德伟曹昌燕邵斌
Owner INST OF CHEM CHINESE ACAD OF SCI
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