Catalyst for preparing pyromellitic dianhydride through durene gas phase oxidation

A technology of pyromethylene and gas-phase oxidation, which is applied in physical/chemical process catalysts, organic chemistry, chemical instruments and methods, etc., can solve the problems of low yield of mono-anhydride and high yield of mono-anhydride, and achieve improved activity and stability. , the effect of improving yield

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

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Problems solved by technology

[0005] One of the technical problems to be solved by the present invention is the low yield of homoanhydride in the prior art, and a catal

Method used

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  • Catalyst for preparing pyromellitic dianhydride through durene gas phase oxidation
  • Catalyst for preparing pyromellitic dianhydride through durene gas phase oxidation

Examples

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Embodiment 1

[0025] Weigh 95g of oxalic acid and 380ml of distilled water in a flask, stir and raise the temperature to 85°C, after the oxalic acid is completely dissolved, make an oxalic acid solution. Add 1 part of vanadium pentoxide to the prepared oxalic acid solution and continue stirring to obtain ammonium vanadyl oxalate solution. Add 8 parts of lanthanum nitrate and 0.2 parts of ammonium borate into the solution, and continue stirring 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 silicon carbide. The inert carrier sprayed with the catalyst precursor was baked in a muffle furnace at 530°C, and the catalyst was obtained after natural cooling. Catalyst at a reaction temperature of 525°C and a space velocity of 5150h -1 Next, it was evaluated in a fixed-bed reactor, and the average anhydride yield was measured to be 74.0%. The evaluation results are shown in Table...

Embodiment 2

[0027] Weigh 95g of oxalic acid and 380ml of distilled water in a flask, stir and raise the temperature to 85°C, after the oxalic acid is completely dissolved, make an oxalic acid solution. Add 1 part of vanadium pentoxide to the prepared oxalic acid solution and continue stirring to obtain ammonium vanadyl oxalate solution. Add 8 parts of lanthanum nitrate and 0.2 parts of strontium nitrate into the solution, and continue stirring 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 silicon carbide. The inert carrier sprayed with the catalyst precursor was baked in a muffle furnace at 530°C, and the catalyst was obtained after natural cooling. Catalyst at a reaction temperature of 525°C and a space velocity of 5150h -1 Next, it was evaluated in a fixed-bed reactor, and the average anhydride yield was measured to be 73.9%. The evaluation results are shown in Tab...

Embodiment 3

[0032] Weigh 95g of oxalic acid and 380ml of distilled water in a flask, stir and raise the temperature to 85°C, after the oxalic acid is completely dissolved, make an oxalic acid solution. Add 1 part of vanadium pentoxide to the prepared oxalic acid solution and continue stirring to obtain ammonium vanadyl oxalate solution. Add 8 parts of cerium nitrate and 0.2 parts of ammonium tellurate into the solution, and continue stirring 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 silicon carbide. The inert carrier sprayed with the catalyst precursor was baked in a muffle furnace at 530°C, and the catalyst was obtained after natural cooling. Catalyst at a reaction temperature of 525°C and a space velocity of 5150h -1Next, it was evaluated in a fixed-bed reactor, and the average anhydride yield was measured to be 74.2%. The evaluation results are shown in Table 1.

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Abstract

The invention relates to a catalyst for preparing pyromellitic dianhydride through durene gas phase oxidation. The catalyst mainly solves the problem that the existing durene gas phase oxidation reaction produces more by-products and leads pyromellitic dianhydride yield reduction. An oxide catalyst utilizes alpha-Al2O3, silicon carbide, a porcelain ring or a mixture thereof as a carrier, and an active component comprises at least one of a vanadium element, a lanthanum element, a nonmetal element and an alkaline-earth metal element. The catalyst solves the technical problem, reduces side reactions during the pyromellitic dianhydride synthesis and improves the yield of pyromellitic dianhydride.

Description

technical field [0001] The invention relates to a catalyst for producing homoanhydride by gas-phase 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, p...

Claims

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Application Information

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IPC IPC(8): B01J27/224C07D493/04
CPCB01J27/224C07D493/04
Inventor 徐俊峰顾龙勤陈亮赵欣
Owner CHINA PETROLEUM & CHEM CORP
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