Method for preparing benzaldehyde catalyst prepared from heteropolyacid type benzyl alcohol

A technology for benzyl alcohol and catalyst is applied in the field of heteropolyacid-type benzyl alcohol to benzaldehyde catalyst and its preparation field, which can solve the problems of corrosive damage of reaction equipment, complicated technological process, etc., and achieve high product yield, high activity, prolonged The effect of service life

Inactive Publication Date: 2018-04-13
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technological process of this method is complicated, and besides benzaldehyde, the obtained product also contains corrosive by-products such as hydrogen chloride and hypobenyl trichloride, which easily cause corrosive damage to the reaction equipment.

Method used

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  • Method for preparing benzaldehyde catalyst prepared from heteropolyacid type benzyl alcohol

Examples

Experimental program
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Effect test

Embodiment 1

[0016] A kind of preparation method of heteropolyacid type benzyl alcohol preparation benzaldehyde catalyst, the method comprises the following steps:

[0017] Step 1. Add 35g of nickel nitrate to 105g of COF-1 nanomaterials, dissolve in deionized water, stir at 70°C until the solution is evaporated to dryness, dry the obtained solid at 110°C for 8 hours, and then roast at 400°C to obtain Catalyst precursor A,

[0018] Step 2. Add the above-mentioned precursor A into a high-pressure reactor, raise the temperature to 450°C under a hydrogen atmosphere, treat at 0.3Mpa for 4 hours, drop to the reaction temperature, add 400g of sorbitol solution with a mass concentration of 20%, and then adjust the hydrogen Pressure to 3MPa, react at 300°C for 2h, filter after the reaction, and dry at 40°C until there is no liquid phase on the surface of the carrier;

[0019] Step 3, then add it to an aqueous solution containing 58.4g of citric acid, stir at 70°C until the solution is evaporated ...

Embodiment 2

[0027] Step 1. Add 25g of nickel nitrate to 105g of COF-1 nanomaterials, dissolve in deionized water, stir at 70°C until the solution is evaporated to dryness, dry the obtained solid at 110°C for 8 hours, and then roast at 400°C to obtain Catalyst precursor A,

[0028] All the other steps are the same as in Example 1.

Embodiment 3

[0030] Step 1. Add 15g of nickel nitrate to 105g of COF-1 nanomaterials, dissolve in deionized water, stir at 70°C until the solution is evaporated to dryness, dry the obtained solid at 110°C for 8 hours, and then roast at 400°C to obtain Catalyst precursor A,

[0031] All the other steps are the same as in Example 1.

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Abstract

The invention discloses a method for preparing a benzaldehyde catalyst prepared from heteropolyacid type benzyl alcohol. Nickel nitrate, a COF-1 nanometer material, citric acid, phosphotungstic acid,dioxane, mesitylene, glacial acetic acid, 2,4,6-tri(4-aminophenyl)-1,3-5 triazine and 2,5-dimethoxy-terephthalaldehyde are taken as main raw materials; the benzaldehyde catalyst prepared from heteropolyacid type benzyl alcohol (NH4)0.5H2.5PW12O40-NiO/COF-1 is prepared by adopting layered loading of nickel nitrate and phosphotungstic acid, nanometer heteropolyacid is sufficiently and uniformly laoded on a COF-1 porous carrier, the loading capacity is improved, nanometer active sites are prepared by adopting a liquid phase reduction method, immediate reaction and immediate loading are realized,the activity of nanometer particles is maintained, and an aggregation effect is avoided; and the catalyst prepared in the invention integrally has relatively high activity, selectivity and carbon deposit resistance, the stability of the catalyst is improved, the service life of the catalyst can be prolonged, the comprehensive reaction performance of the reaction system is improved, and the catalyst has higher product yield.

Description

technical field [0001] The invention relates to a catalyst for preparing benzaldehyde from heteropolyacid benzyl alcohol and a preparation method thereof, belonging to the technical field of catalysts. Background technique [0002] At present, toluene photochlorination hydrolysis is usually used in industry to produce benzaldehyde. The process is to firstly chlorinate toluene to obtain a mixture containing benzyl chloride, benzylidene dichloride and benzyl trichloride, and then convert benzyl chloride from After the mixture is separated, a hydrolysis catalyst is added to the remaining mixture, the temperature is gradually raised, and water is added to carry out hydrolysis. After the hydrolysis is completed, the product is obtained after neutralization, alkali washing and distillation. The process of this method is complicated, and the obtained product contains not only benzaldehyde, but also corrosive by-products such as hydrogen chloride and hypobenzyl trichloride, which ea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/18B01J27/188C07C45/38C07C47/54B01J37/18B01J37/02
CPCB01J27/188B01J31/06B01J31/34B01J37/0203B01J37/0205B01J37/18C07C45/38C07C47/54
Inventor 陈浩张波花修洋
Owner XUZHOU NORMAL UNIVERSITY
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