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Catalyst for preparation of pyromellitic dianhydride through durene oxidation

The technology of a pyromethylene and a catalyst is applied in the field of catalysts used for the oxidation of pyromethylene to produce homoanhydride, can solve the problems of high yield of homoanhydride, low yield of homoanhydride catalyst, etc., achieves improved activity and stability, improved Yield effect

Active Publication Date: 2018-04-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the technical problems to be solved by the present invention is the low yield of homoanhydride catalysts in the prior art. A catalyst for the oxidation of durene to prepare homoanhydride is provided. The catalyst has the characteristics of high homoanhydride yield.

Method used

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  • Catalyst for preparation of pyromellitic dianhydride through durene oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh 88g of oxalic acid and 340ml of distilled water in a flask, stir and heat up to 80°C, and prepare an oxalic acid solution after the oxalic acid is completely dissolved. Add a portion of vanadium pentoxide to the prepared oxalic acid solution and continue stirring to obtain ammonium vanadyl oxalate solution. 5 parts TiO 2 , 0.4 parts of ammonium dihydrogen phosphate were added into the solution, and the catalyst precursor was obtained after continuing to stir evenly. After the catalyst precursor is filtered and dried, it is loaded into a spraying machine and evenly sprayed on the inert carrier α-alumina. The inert carrier sprayed with the catalyst precursor was calcined in a muffle furnace at 560 ° C, and the catalyst was obtained after natural cooling. Catalyst at a reaction temperature of 480°C and a space velocity of 5400h -1 Next, it was evaluated in a fixed-bed reactor, and the average anhydride yield was measured to be 71.4%. The evaluation results are sho...

Embodiment 2

[0026] Weigh 88g of oxalic acid and 340ml of distilled water in a flask, stir and heat up to 80°C, and prepare an oxalic acid solution after the oxalic acid is completely dissolved. Add a portion of vanadium pentoxide to the prepared oxalic acid solution and continue stirring to obtain ammonium vanadyl oxalate solution. 5 parts TiO 2 , 0.4 parts of potassium nitrate were added into the solution, and the catalyst precursor was obtained after continuing to stir evenly. After the catalyst precursor is filtered and dried, it is loaded into a spraying machine and evenly sprayed on the inert carrier α-alumina. The inert carrier sprayed with the catalyst precursor was calcined in a muffle furnace at 560 ° C, and the catalyst was obtained after natural cooling. Catalyst at a reaction temperature of 480°C and a space velocity of 5400h -1 Next, it was evaluated in a fixed-bed reactor, and the average anhydride yield was measured to be 71.2%. The evaluation results are shown in Table ...

Embodiment 3

[0031] Weigh 88g of oxalic acid and 340ml of distilled water in a flask, stir and heat up to 80°C, and prepare an oxalic acid solution after the oxalic acid is completely dissolved. Add a portion of vanadium pentoxide to the prepared oxalic acid solution and continue stirring to obtain ammonium vanadyl oxalate solution. Add 5 parts of titanium tetrachloride and 0.4 parts of diammonium hydrogen phosphate into the solution, and continue to stir evenly to obtain a catalyst precursor. After the catalyst precursor is filtered and dried, it is loaded into a spraying machine and evenly sprayed on the inert carrier α-alumina. The inert carrier sprayed with the catalyst precursor was calcined in a muffle furnace at 560 ° C, and the catalyst was obtained after natural cooling. Catalyst at a reaction temperature of 480°C and a space velocity of 5400h -1 Next, it was evaluated in a fixed bed reactor, and the average anhydride yield was measured to be 71.3%. The evaluation results are sh...

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Abstract

The invention relates to a catalyst for preparation of pyromellitic dianhydride through durene oxidation. The catalyst mainly solves the problem that the existing pyromellitic dianhydride production catalyst has low activity, produces more by-products and leads product yield reduction. An oxide catalyst utilizes alpha-Al2O3, silicon carbide, a porcelain ring or a mixture thereof as a carrier, andan active component comprises at least one of a vanadium element, a titanium element, a group VA element and an alkali metal element. The catalyst solves the technical problem and greatly improves theyield of pyromellitic dianhydride.

Description

technical field [0001] The invention relates to a catalyst for producing homoanhydride by oxidation of durene, a preparation method thereof, and a synthesis method of homoanhydride. technical background [0002] 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, pharmaceuti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/198B01J23/22B01J23/18C07D493/04
CPCB01J23/18B01J23/22B01J27/198C07D493/04
Inventor 徐俊峰顾龙勤金照生
Owner CHINA PETROLEUM & CHEM CORP
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