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Method for preparing maleic anhydride through n-butane

A technology of n-butane and maleic anhydride, which is applied in the field of n-butane to prepare maleic anhydride, can solve the problems of strengthening catalyst heat transfer and mass transfer ability, etc., so as to avoid sudden catalyst deactivation, improve selectivity and yield rate, to avoid the effect of overheating

Inactive Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] After years of hard work, although the mass transfer ability and catalyst stability of the vanadium phosphorus oxygen catalyst have been greatly improved, most of the current research focuses on the modification of the catalyst, and some researches on enhancing the heat transfer and mass transfer ability of the catalyst Important issues remain unresolved

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  • Method for preparing maleic anhydride through n-butane
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  • Method for preparing maleic anhydride through n-butane

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preparation example Construction

[0045] Preparation of Foamed SiC Ceramic Material

[0046] In the present invention, the foamed SiC ceramic material can use the following preparation method: after cutting the foamed plastic, immerse it in the slurry, after taking it out, remove the excess slurry, semi-cure, and then solidify at high temperature and high pressure; heat the solidified foam solution, to obtain a foamy carbon skeleton composed of SiC and pyrolytic carbon that is the same shape as the original foam; grind the central hole of the carbon skeleton, and use the pressure injection method to inject SiC slurry into the central hole of the carbon skeleton and fill the central hole , and then pyrolyzed; after the siliconizing process, the carbon in the carbon skeleton reacts with gas or liquid silicon to form silicon carbide, which is combined with the original silicon carbide particles in the foam skeleton to obtain high-strength and dense foam SiC ceramics. The silicon carbide foam ceramic of the invent...

Embodiment 1

[0054] The catalyst adopts vanadium phosphorus oxide / foam SiC structured catalyst with high intercrystalline porosity, and the catalyst volume is 25mL. The VPO / foam SiC structured catalyst is not modified, the VPO crystal size is 20nm, the P / V atomic ratio is 1.05, the VPO coating thickness is 10 μm, and the VPO crystal loading is 10% by weight. The pore diameter of the foamed SiC carrier is 1 mm, and the porosity is 50%. The specific surface area of ​​vanadium phosphooxygen / foamed SiC structured catalyst is 55.9m 2 g -1 , the micropore surface area is 25.6m 2 g -1 , the outer surface area of ​​the composite material measured by t-plot method is 27.3m 2 g -1 . The vanadium-phosphorus-oxygen crystals in the vanadium-phosphorus-oxygen coating have high intercrystalline porosity, and the volume of mesopores formed by overlapping vanadium-phosphorus-oxygen crystals accounts for 50% of the total pore volume.

[0055] The oxidation reaction of n-butane to maleic anhydride is ...

Embodiment 2

[0057] The catalyst adopts a single-layer vanadium phosphorus oxide / foam SiC structured catalyst, and the volume of the catalyst is 25mL. The VPO / foam SiC structured catalyst is not modified, the VPO crystal size is 100nm, the P / V atomic ratio is 0.89, the VPO coating thickness is 1 μm, and the VPO crystal loading is 5% by weight. The pore diameter of the foamed SiC carrier is 3 mm, and the porosity is 85%. The specific surface area of ​​vanadium phosphooxygen / foamed SiC structured catalyst is 15.5m 2 g -1 , the micropore surface area is 8.6m 2 g -1 , the outer surface area of ​​the composite material measured by t-plot method is 7.2m 2 g -1 . The vanadium-phosphorus-oxygen crystals in the vanadium-phosphorus-oxygen coating have high intercrystalline porosity, and the volume of mesopores formed by overlapping vanadium-phosphorus-oxygen crystals accounts for 30% of the total pore volume.

[0058] The oxidation reaction of n-butane to maleic anhydride is carried out in a ...

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Abstract

The invention relates to a method for preparing maleic anhydride through n-butane. The method comprises the following steps: contacting and chemically reacting n-butane and air which serve as the raw materials and a vanadium phosphorus oxide / foamed SiC structural catalyst which is used as an active component through a reactor to obtain a maleic anhydride product, wherein the vanadium phosphorus oxide / foamed SiC structural catalyst is a structural catalyst prepared by loading a vanadium phosphorus oxide coating and / or a vanadium phosphorus oxide crystal on a SiC carrier; the chemical reaction is performed at the temperature of 350 to 550 DEG C, and the temperature is preferably 400 to 500 DEG C; the reaction pressure is 0 to 3.0MPa and preferably 0 to 1.0MPa; the foamed SiC is high in heat transfer capacity, and therefore, the phenomena of sudden inactivation and temperature runaway of the catalyst due to local overheat of the catalyst can be effectively avoided.

Description

technical field [0001] The invention relates to a method for preparing maleic anhydride from n-butane, in particular to a method for preparing maleic anhydride from n-butane in the presence of foamed SiC, more specifically using vanadium phosphorus oxygen / foamed SiC structured catalyst as the active group Yuan, a method for preparing maleic anhydride from n-butane. Background technique [0002] Maleic anhydride, also known as maleic anhydride, is an important organic chemical raw material and the third largest organic anhydride in the world after phthalic anhydride and acetic anhydride. It is widely used in petrochemical, food processing, and pharmaceutical industries. , Building materials and other industries. At present, benzene oxidation and n-butane oxidation are two main routes for the production of maleic anhydride (by-product of phthalic anhydride and C 4 The distillate can also produce maleic anhydride), among which the benzene oxidation method is the earliest appl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D307/60B01J27/228B01J35/10
CPCC07D307/60B01J27/228B01J35/63
Inventor 蒋斌波陈楠林雯赵锦波杨遥黄正梁廖祖维王靖岱阳永荣
Owner CHINA PETROLEUM & CHEM CORP
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