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Method for preparing maleic anhydride by oxidizing n-butane

A technology of n-butane and maleic anhydride, which is applied in the field of n-butane oxidation to maleic anhydride, can solve the problems of increasing the yield of maleic anhydride, and achieve the effects of increasing the amount of raw materials processed, the conversion rate of raw materials and the yield of maleic anhydride

Active Publication Date: 2021-03-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the current production route using n-butane as raw material occupies a dominant position in the production of maleic anhydride, the catalyst needs to further improve its activity and selectivity to increase the yield of maleic anhydride

Method used

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  • Method for preparing maleic anhydride by oxidizing n-butane
  • Method for preparing maleic anhydride by oxidizing n-butane
  • Method for preparing maleic anhydride by oxidizing n-butane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Add 212g V to the 5L reactor 2 o 5 , a mixed solution of 2000mL isobutanol and 300mL benzyl alcohol, stirred evenly and under reflux for 3h, added dropwise 217g of 105wt% phosphoric acid and heated and stirred until reflux for 12h, and the obtained precipitate was vacuum-dried at 150°C for 24h after centrifugation. The powder was mixed with 4% graphite powder and 10% stearic acid, granulated and pressed into a molded catalyst. The obtained catalyst precursor structure is firstly subjected to the depore expansion agent operation in the activator, and the temperature is raised to 185°C at a heating rate of 2°C / min, kept at this temperature for 5h, and continued to be heated at a heating rate of 2°C / min to 198°C, keep at this temperature for 5h, raise the temperature to 250°C at a heating rate of 5°C / min, keep at this temperature for 2h, then change the atmosphere to a mixed atmosphere of 70% water vapor and 30% air, the volume space velocity is 2300h -1 Yes, continue t...

Embodiment 2

[0035] Into a 5L round bottom flask add 212g of V 2 o 5 A mixed solution of 2250mL isobutanol and 250mL benzyl alcohol was heated and stirred to reflux for 3h, 306g of 85wt% phosphoric acid was added dropwise and heated and stirred to reflux for 20h, and the resulting precipitate was centrifuged and washed with absolute ethanol and dried at 150°C for 24h. Afterwards, it was calcined at 250° C. for 5 hours. After the calcining, the raw powder was mixed with 4% graphite powder and 10% citric acid to granulate and pressed into a molded catalyst. The obtained catalyst precursor structure was heated to 185°C at a heating rate of 2°C / min in the activator, kept at this temperature for 5h, and continued to be heated at a heating rate of 5°C / min to 250°C, at this temperature Keep it for 1h, then replace the atmosphere with a mixed atmosphere of 75% water vapor and 25% air, and the space velocity is 2000h -1 Under the operating conditions, the temperature was raised to 400°C at a heat...

Embodiment 3

[0037] Into a 5L round bottom flask add 212g of V 2 o 5 A mixed solution of 2250mL isobutanol and 250mL benzyl alcohol was heated and stirred to reflux for 3h, 275g of 100wt% phosphoric acid was added dropwise and heated and stirred to reflux for 20h, and the resulting precipitate was centrifuged and washed with absolute ethanol and dried at 150°C for 24h. Afterwards, it was calcined at 250° C. for 5 hours. After the calcining, the raw powder was mixed with 4% graphite powder and 10% oxalic acid to be granulated and pressed into a molded catalyst. The obtained catalyst precursor structure was heated to 185°C at a heating rate of 2°C / min in the activator, kept at this temperature for 5h, and continued to be heated at a heating rate of 5°C / min to 250°C, at this temperature Keep it for 1h, then replace the atmosphere with a mixed atmosphere of 75% water vapor and 25% air, and the space velocity is 1700h -1 Under the operating conditions, the temperature is raised to 390°C at a ...

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Abstract

The invention provides a method for preparing maleic anhydride by oxidizing n-butane. The method comprises the following steps: enabling raw material gas containing n-butane to contact with a first vanadium-phosphorus-oxygen catalyst and then contact with a second vanadium-phosphorus-oxygen catalyst to react to generate maleic anhydride, wherein the average valence state of vanadium in the first vanadium-phosphorus-oxygen catalyst is higher than that of vanadium in the second vanadium-phosphorus-oxygen catalyst. The method provided by the invention can improve the raw material treatment capacity, the raw material conversion rate and the maleic anhydride yield.

Description

technical field [0001] The invention relates to a method for preparing maleic anhydride by oxidation of n-butane. Background technique [0002] Maleic anhydride (maleic anhydride) is an important organic chemical raw material and fine chemical product. It is the third largest anhydride in the world after phthalic anhydride and acetic anhydride. It is mainly used in the production of thermosetting resins and unsaturated polyesters. Resins are used in the fields of pesticides, medicines, coatings, inks, lubricating oil additives, paper chemicals, textile chemicals, textile finishing agents, food additives, and surfactants. In addition, a series of widely used fine chemical products such as 1,4-butanediol (GBL), tetrahydrofuran (THF), maleic acid, fumaric acid and tetrahydroanhydride can be produced with maleic anhydride as raw material. It is very broad, and its application scope is still expanding. [0003] The maleic anhydride production process mainly includes benzene cat...

Claims

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Application Information

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IPC IPC(8): C07D307/60B01J27/198
CPCC07D307/60B01J27/198Y02P20/584
Inventor 师慧敏张东顺张作峰冯晔安欣袁滨刘玉芬
Owner CHINA PETROLEUM & CHEM CORP
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