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Catalyst for synthesizing pyromellitic dianhydride from durene

A technology of durene and catalyst, which is applied in the field of homoanhydride synthesis, can solve the problems of low homoanhydride yield and high homoanhydride yield, and achieve the effect of improving activity and stability and increasing yield

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 in the prior art, and a catalyst for synthesizing homoanhydride from durene is provided, which has the characteristics of high yield of homoanhydride

Method used

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  • Catalyst for synthesizing pyromellitic dianhydride from durene
  • Catalyst for synthesizing pyromellitic dianhydride from durene

Examples

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Effect test

Embodiment 1

[0025] Weigh 90g of oxalic acid and 350ml 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 a portion of vanadium pentoxide to the prepared oxalic acid solution and continue stirring to obtain ammonium vanadyl oxalate solution. 4 parts TiO 2 , 0.4 parts of chromium 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 baked in a muffle furnace at 550°C, and the catalyst was obtained after natural cooling. Catalyst at a reaction temperature of 500°C and a space velocity of 5500h -1 Next, in the fixed-bed reactor evaluation, the average anhydride yield was measured to be 72.9%, and the evaluation results are shown in Table 1....

Embodiment 2

[0027] Weigh 90g of oxalic acid and 350ml 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 a portion of vanadium pentoxide to the prepared oxalic acid solution and continue stirring to obtain ammonium vanadyl oxalate solution. 4 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 baked in a muffle furnace at 550°C, and the catalyst was obtained after natural cooling. Catalyst at a reaction temperature of 500°C and a space velocity of 5500h -1 Next, it was evaluated in a fixed-bed reactor, and the average anhydride yield was measured to be 72.8%. The evaluation results are shown in Tab...

Embodiment 3

[0032]Weigh 90g of oxalic acid and 350ml 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 a portion of vanadium pentoxide to the prepared oxalic acid solution and continue stirring to obtain ammonium vanadyl oxalate solution. Add 4 parts of zirconium nitrate and 0.4 parts of chromium nitrate 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 α-alumina. The inert carrier sprayed with the catalyst precursor was baked in a muffle furnace at 550°C, and the catalyst was obtained after natural cooling. Catalyst at a reaction temperature of 500°C and a space velocity of 5500h -1 Next, it was evaluated in a fixed bed reactor, and the average anhydride yield was measured to be 73.3%. The evaluation results are shown in Table 1.

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Abstract

The invention relates to a catalyst for synthesizing pyromellitic dianhydride from durene. The catalyst mainly overcomes the problem of low yield of the target product pyromellitic dianhydride due toa great number of side reactions in oxidation of durene in the prior art. According to the invention, an oxide catalyst is employed; the catalyst adopts alpha-Al2O3, silicon carbide, a ceramic ring ora mixture thereof as a carrier; and the active component of the catalyst is at least one selected from a group consisting of elemental vanadium, group-IVB elements, group-VIB elements and alkali metal elements. With such a technical scheme, the above technical problem is overcome, side reactions in oxidation of durene are reduced, and the yield of pyromellitic dianhydride is improved.

Description

technical field [0001] The invention relates to a catalyst for synthesizing homoanhydride from 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, pharmaceutical inte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/22B01J23/26B01J23/28C07D493/04
CPCB01J23/22B01J23/26B01J23/28C07D493/04
Inventor 徐俊峰顾龙勤金照生
Owner CHINA PETROLEUM & CHEM CORP
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