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Foam-structure catalyst used in reaction for preparing benzyl alcohol from benzaldehyde through hydrogenation and preparation thereof

A foam structure and catalyst technology, applied in the field of foam structure catalyst and its preparation, can solve the problems of easy wear, complex recovery process, difficult separation of catalyst, etc., and achieve the effects of simple experimental operation process, good catalytic activity, easy separation and recovery

Inactive Publication Date: 2017-12-08
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a foam structure catalyst and preparation method thereof for the hydrogenation of benzaldehyde to prepare benzyl alcohol, which mainly solves the problems of easy wear of traditional granular catalysts, difficult separation of catalysts, complicated recovery process, etc.

Method used

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  • Foam-structure catalyst used in reaction for preparing benzyl alcohol from benzaldehyde through hydrogenation and preparation thereof
  • Foam-structure catalyst used in reaction for preparing benzyl alcohol from benzaldehyde through hydrogenation and preparation thereof
  • Foam-structure catalyst used in reaction for preparing benzyl alcohol from benzaldehyde through hydrogenation and preparation thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0023] (1) The preparation method of foamed silicon carbide (the first carrier) is based on the preparation method described in the invention patent with application number CN03134039.3 (publication number CN1600742A). The foamed silicon carbide has a three-dimensional interconnected network porous structure, and the silicon carbide The number of meshes is 2-50PPI, the size range of meshes is 0.5mm-12mm, and the porosity is 20%-90%.

[0024] (2) Prepare a certain concentration of aluminum sol with stable properties, and add an appropriate amount of active γ-Al with a particle size of less than 20 microns in the aluminum sol 2 o 3 Powder, form slurry after ball milling for 6 hours. Among them, the concentration of aluminum sol is 10wt% ~ 30wt%, active γ-Al 2 o 3 The weight ratio of the powder to the aluminum sol is 1: (0.1-2). Immerse the foamed silicon carbide in the slurry for 1 min, remove the excess slurry in the hole after taking it out, and dry it. The dipping and dr...

Embodiment 1

[0029] The first carrier used in the foam structure catalyst for the reaction of benzaldehyde hydrogenation to prepare benzyl alcohol described in this example is silicon carbide foam, and the second carrier is gamma-Al 2 o 3 , the active component is Ni, and the specific preparation steps are as follows:

[0030] (1) Preparation of foamed silicon carbide

[0031] The preparation method of foamed silicon carbide (the first carrier) is based on the preparation method described in the invention patent with application number CN03134039.3 (publication number CN1600742A). The foamed silicon carbide used in this embodiment has a three-dimensional connected porous structure, the number of meshes of silicon carbide is 10PPI, the average size of the foam holes is 2mm, the porosity is 80%, and the volume of the foamed silicon carbide is 5cm 3 .

[0032] (2) Preparation of alumina impregnation slurry

[0033] Weigh 15g of pseudo-boehmite and dissolve it in 100mL of distilled water, ...

Embodiment 2

[0045] The difference from Example 1 is that the mesh number of the foamed silicon carbide is 15PPI, the average size of the foam cells is 1.6mm, and the porosity is 76%.

[0046] The catalytic performance index of the foam structure catalyst used in the hydrogenation of benzaldehyde to prepare benzyl alcohol in this embodiment is: the conversion rate of benzaldehyde is 88.7%, and the selectivity of benzyl alcohol is 98.8%.

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Abstract

The present invention relates to the field of structured catalytic materials, in particular to a foam-structure catalyst used in a reaction for preparing benzyl alcohol from benzaldehyde through hydrogenation and a preparation method thereof. The objective of the invention is to overcome the problems that conventional granular catalysts are prone to wearing; the catalysts are difficult to separate from reaction products; recovery processes are complex; etc. The foam-structure catalyst in the invention is of a three-dimensional interconnected network foam structure; the main structure of the catalyst is composed of a foam ceramic material used as a first carrier, a coating (used as a second carrier), a catalytically active component and the like, wherein the second carrier uniformly coats the surfaces of foam ribs of the first carrier, and the catalytically active component is uniformly supported in the second carrier with a high specific surface area. The foam-structure catalyst of the invention is used for a reaction for preparing benzyl alcohol from benzaldehyde through liquid-phase hydrogenation; technology is simplified; and complicated equipment is not needed. The foam-structure catalyst can enhance the mass transfer process of a chemical reaction while avoiding catalyst wearing and simplifying a separation process, and has the advantages of high mass transfer efficiency, good catalytic activity, high benzyl alcohol selectivity and good stability.

Description

technical field [0001] The invention relates to the field of structured catalytic materials, in particular to a foam structure catalyst used for the hydrogenation of benzaldehyde to prepare benzyl alcohol and a preparation method thereof. Background technique [0002] Benzyl alcohol is the simplest and most industrially important aromatic alcohol. It is an important intermediate in the synthesis of fragrances, and an indispensable component in the formulation of fragrances such as jasmine, moonflower, and ylang ylang. Benzyl alcohol can undergo a series of reactions such as dehydrogenation reaction, oxidation reaction, etherification reaction, esterification reaction, etc., and derive many chemical products. At the same time, it is widely used in the fields of coatings, textiles, medicine, and photosensitive materials. At present, the main production methods of benzyl alcohol are toluene oxidation, benzyl chloride hydrolysis, benzoic acid and its ester liquid-phase reductio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/224B01J23/755B01J23/44B01J35/10C07C29/141C07C33/22
CPCC07C29/141B01J23/44B01J23/755B01J27/224B01J35/60C07C33/22
Inventor 张劲松李恺高勇杨振明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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