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Preparation method of catalyst for preparing pyromellitic dianhydride

A technology of catalysts and group elements, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of low yield of homoanhydride

Active Publication Date: 2020-05-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method has made great progress in the preparation of the homoanhydride catalyst by oxidation of durene, but there is still the problem that the homoanhydride yield is low

Method used

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  • Preparation method of catalyst for preparing pyromellitic dianhydride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Weigh 50g of oxalic acid and 150ml of distilled water in a flask, stir and raise the temperature to 80°C, after the oxalic acid is completely dissolved, make an oxalic acid solution. Add 1 part of vanadium pentoxide to the oxalic acid solution and continue stirring. Add 5 parts of titanium dioxide and 0.1 part of ammonium dihydrogen phosphate into the solution, and continue to stir evenly to obtain spray coating solution A. Weigh 50g of oxalic acid and 150ml of distilled water in a flask, stir and raise the temperature to 80°C, after the oxalic acid is completely dissolved, make an oxalic acid solution. Add 1 part of vanadium pentoxide to the oxalic acid solution and continue stirring. Add 5 parts of titanium dioxide, 0.1 part of ammonium dihydrogen phosphate and 0.1 part of ammonium molybdate into the solution, and continue to stir evenly to obtain spray coating solution B. Load the inert carrier into the spraying machine, heat the carrier to 200°C, and evenly spray ...

Embodiment 2

[0036] Weigh 50g of oxalic acid and 150ml of distilled water in a flask, stir and raise the temperature to 80°C, after the oxalic acid is completely dissolved, make an oxalic acid solution. Add 1 part of vanadium pentoxide to the oxalic acid solution and continue stirring. Add 5 parts of titanium dioxide and 0.1 part of ammonium dihydrogen phosphate into the solution, and continue to stir evenly to obtain spray coating solution A. Weigh 50g of oxalic acid and 150ml of distilled water in a flask, stir and raise the temperature to 80°C, after the oxalic acid is completely dissolved, make an oxalic acid solution. Add 1 part of vanadium pentoxide to the oxalic acid solution and continue stirring. Add 5 parts of titanium dioxide, 0.1 part of ammonium dihydrogen phosphate and 0.2 part of ammonium molybdate into the solution, and continue to stir evenly to obtain spray coating solution B. Load the inert carrier into the spraying machine, heat the carrier to 200°C, and evenly spray ...

Embodiment 3

[0038] Weigh 50g of oxalic acid and 150ml of distilled water in a flask, stir and raise the temperature to 80°C, after the oxalic acid is completely dissolved, make an oxalic acid solution. Add 1 part of vanadium pentoxide to the oxalic acid solution and continue stirring. Add 5 parts of titanium dioxide and 0.2 parts of ammonium dihydrogen phosphate into the solution, and continue to stir to obtain a spray solution A. Weigh 50g of oxalic acid and 150ml of distilled water in a flask, stir and raise the temperature to 80°C, after the oxalic acid is completely dissolved, make an oxalic acid solution. Add 1 part of vanadium pentoxide to the oxalic acid solution and continue stirring. Add 5 parts of titanium dioxide, 0.2 parts of ammonium dihydrogen phosphate and 0.2 parts of ammonium molybdate into the solution, and continue stirring evenly to obtain spray coating solution B. Load the inert carrier into the spraying machine, heat the carrier to 200°C, and evenly spray the spray...

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Abstract

The invention relates to a preparation method of a catalyst for preparing pyromellitic dianhydride from durene, and mainly solves the problem of low pyromellitic dianhydride yield caused by excessivebyproducts and complete combustion in the prior art. An oxide catalyst is adopted in the invention, according to the catalyst, alpha-Al2O3, silicon carbide, a ceramic ring or a mixture thereof is usedas a carrier; an active component comprises vanadium element, titanium element, and at least one of a VA group element and a VIB group element, and two different active component solutions are sequentially sprayed on the inert carrier in the spraying method, so that side reactions and complete combustion during pyromellitic dianhydride synthesis are reduced, and the yield of pyromellitic dianhydride is increased.

Description

technical field [0001] The invention relates to a catalyst for preparing homoanhydride, a preparation method thereof, and a synthesis method of homoanhydride. [0002] technical background [0003] With the rapid development of petroleum refining, chemical fiber and polyester industries, large ethylene units, catalytic reforming units, aromatics units, disproportionation, and isomerization processes will by-produce a large amount of C10 aromatics. Therefore, how to effectively utilize C10 aromatic resources has become an important topic in petrochemical industry. As an important intermediate of high value-added fine chemicals, pyromellitic dianhydride (PMDA, homoanhydride) with a special structure of 4 symmetrical carboxyl groups can be made into many products with excellent heat resistance, electrical insulation and chemical resistance. The product. Mainly used in the production of polyimide, polyimidazole and other heat-resistant resin monomers, pharmaceutical intermediat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/199B01J37/08B01J37/28C07D493/04
CPCB01J27/199B01J37/08B01J37/0018B01J37/28C07D493/04
Inventor 周继鹏顾龙勤徐俊峰方敏杨旭
Owner CHINA PETROLEUM & CHEM CORP