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Catalyst for durene gas phase oxidation reaction

A technology of durene and gas-phase oxidation, applied in the direction of physical/chemical process catalysts, organic chemistry, chemical instruments and methods, etc., can solve the problems of high yield of homoanhydride and low yield of homoanhydride, and achieve improved activity and stability performance, and the effect of increasing the 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 the gas-phase oxidation of durene is provided, which has the characteristics of high yield of homoanhydride

Method used

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  • Catalyst for durene gas phase oxidation reaction
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Examples

Experimental program
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Effect test

Embodiment 1

[0025] Weigh 90g of oxalic acid and 320ml of distilled water in a flask, stir and raise the temperature to 83°C, after the oxalic acid is completely dissolved, make an oxalic acid solution. Add 1 part of ammonium metavanadate to the prepared oxalic acid solution and continue stirring to obtain ammonium vanadyl oxalate solution. Add 4 parts of tin chloride and 0.4 parts of methyl arsinic acid 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 silicon carbide. The inert carrier sprayed with the catalyst precursor was baked in a muffle furnace at 525°C, and the catalyst was obtained after natural cooling. Catalyst at a reaction temperature of 515°C and a space velocity of 5050h -1 Next, it was evaluated in a fixed bed reactor, and the average anhydride yield was measured to be 74.1%. The evaluation results are shown in Tabl...

Embodiment 2

[0027] Weigh 90g of oxalic acid and 320ml of distilled water in a flask, stir and raise the temperature to 83°C, after the oxalic acid is completely dissolved, make an oxalic acid solution. Add 1 part of ammonium metavanadate to the prepared oxalic acid solution and continue stirring to obtain ammonium vanadyl oxalate solution. Add 4 parts of tin chloride and 0.4 parts of sodium nitrate 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 silicon carbide. The inert carrier sprayed with the catalyst precursor was baked in a muffle furnace at 525°C, and the catalyst was obtained after natural cooling. Catalyst at a reaction temperature of 515°C and a space velocity of 5050h -1 Next, it was evaluated in a fixed-bed reactor, and the average anhydride yield was measured to be 74.3%. The evaluation results are shown in Table 1. ...

Embodiment 3

[0032] Weigh 90g of oxalic acid and 320ml of distilled water in a flask, stir and raise the temperature to 83°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 4 parts of germanium chloride and 0.4 parts of trichlorosilane 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 525°C, and the catalyst was obtained after natural cooling. Catalyst at a reaction temperature of 515°C and a space velocity of 5050h -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 Tabl...

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Abstract

The invention relates to a catalyst for a durene gas phase oxidation reaction. 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 group IVA 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 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, pharmaceutical intermediates...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/228B01J27/224C07D493/04
CPCB01J27/224B01J27/228C07D493/04
Inventor 顾龙勤徐俊峰王丹柳周继鹏
Owner CHINA PETROLEUM & CHEM CORP
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