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Composite catalyst with high specific surface area and application of composite catalyst in preparation of pyromellitic dianhydride through catalytic oxidation

A technology of pyromellitic dianhydride and composite catalyst, applied in the field of catalyst preparation, can solve problems such as low yield of target product, insufficient catalytic activity, small specific surface area, etc., achieve abundant defects, high redox ability, and control calcination conditions , the effect of large specific surface area

Active Publication Date: 2020-10-30
连云港鹏辰特种新材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned catalyst can effectively catalyze the oxidation of durene to prepare pyromellitic dianhydride, but the specific surface area is small, the catalytic activity is not enough, and the yield of the target product is low

Method used

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  • Composite catalyst with high specific surface area and application of composite catalyst in preparation of pyromellitic dianhydride through catalytic oxidation

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Experimental program
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Effect test

Embodiment 1

[0025] (1) 5g of boron nitride nanosheets are added to 100ml of 5% sodium hydroxide solution at 100°C for activating treatment with stirring for 1h, filtered, and dried to obtain activated boron nitride nanosheets; Into the mixed solution containing 1mol / L magnesium nitrate and 2mol / L aluminum nitrate, add dropwise 3% sodium citrate solution and 5% sodium hydroxide solution for precipitation treatment for 2 hours, keep the dripping of sodium hydroxide solution The acceleration is 1.5ml / min; after the precipitation is completed, the mixed solution is transferred to a hydrothermal kettle, stirred at high temperature, then cooled to room temperature, filtered, and vacuum-dried. The dried solid is placed in a muffle furnace at 10°C / The temperature was raised to 500°C at a rate of 1 min, and the heat preservation treatment was carried out for 1 hour, and then the temperature was raised to 700°C at a rate of 5°C / min, and the heat preservation treatment was carried out for 2 hours; t...

Embodiment 2

[0028] (1) 5g of boron nitride nanosheets are added to 100ml of 5% sodium hydroxide solution at 100°C for activating treatment with stirring for 3h, filtered, and dried to obtain activated boron nitride nanosheets; Into the mixed solution containing 2mol / L magnesium nitrate and 4mol / L aluminum nitrate, add dropwise 3% sodium citrate solution and sodium hydroxide solution with a mass concentration of 510% respectively for precipitation treatment for 6 hours, and keep the dripping of sodium hydroxide solution The acceleration is 3.5ml / min; after the precipitation is completed, the mixed solution is transferred to a hydrothermal kettle, stirred at high temperature, then cooled to room temperature, filtered, and vacuum-dried. The dried solid is placed in a muffle furnace at 10°C / The temperature was raised to 500°C at a rate of 1 min, and the heat preservation treatment was carried out for 1 hour, and then the temperature was raised to 700°C at a rate of 5°C / min, and the heat prese...

Embodiment 3

[0031] (1) 5g of boron nitride nanosheets are added to 100ml of 5% sodium hydroxide solution at 100°C for activating treatment with stirring for 2h, filtered, and dried to obtain activated boron nitride nanosheets; In the mixed solution that contains 1.5mol / L magnesium nitrate, 3mol / L aluminum nitrate, add dropwise respectively 3% sodium citrate solution and the sodium hydroxide solution that mass concentration is 5% and carry out precipitation treatment 3h, keep the sodium hydroxide solution The rate of addition is 1.5-ml / min; after the precipitation is completed, the mixed solution is transferred to a hydrothermal kettle, stirred at high temperature, cooled to room temperature, filtered, and vacuum-dried. The dried solid is placed in a muffle furnace at first The temperature was raised to 500°C at the rate of ℃ / min, and the heat preservation treatment was carried out for 1h, and then the temperature was raised to 700°C at the rate of 5°C / min, and the heat preservation treatme...

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Abstract

The invention discloses a composite catalyst with a high specific surface area, which is characterized in that the composite catalyst comprises a magnesium aluminate spinel / boron nitride composite material prepared by taking boron nitride nanosheets as a guiding agent, and vanadium, titanium and molybdenum composite oxides growing on the magnesium aluminate spinel / boron nitride composite materialin situ, the invention also discloses the composite catalyst and application of the composite catalyst in preparation of pyromellitic dianhydride through catalytic oxidation. The composite catalyst provided by the invention is good in dispersity, large in specific surface area, high in catalytic activity and long in service life; when the catalyst is used for preparing pyromellitic dianhydride, the yield of the product can be effectively improved.

Description

Technical field: [0001] The invention relates to the field of catalyst preparation, in particular to a composite catalyst with a high specific surface area and its application in the preparation of pyromellitic dianhydride by catalytic oxidation. Background technique: [0002] Pyromellitic dianhydride is also known as 2,4,5-pyromellitic anhydride, the molecular formula is C 10 h 2 o 6 , with a molecular weight of 218.1193, this substance is mainly used in the production of polyimide resins, high temperature resistant electrical insulating varnishes, PVC plasticizers, synthetic resin crosslinking agents and epoxy resin curing agents, and is also used in the production of phthalocyanine blue dyes. [0003] At present, the production method of pyromellitic dianhydride in China mostly uses durene with vanadium titanium oxide as a catalyst, and uses air catalytic oxidation to obtain a crude product pyromellitic dianhydride, and then obtains fine pyromellitic dianhydride through...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J35/10B01J35/02C07D493/04
CPCB01J27/24C07D493/04B01J35/394B01J35/50B01J35/61B01J35/40
Inventor 江晓龙谈勇谈俊
Owner 连云港鹏辰特种新材料有限公司
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