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Preparation method of catalyst for improving the yield of n-butane oxidation to maleic anhydride

A catalyst and n-butane technology, applied in physical/chemical process catalysts, chemical instruments and methods, organic chemistry, etc., can solve problems affecting catalyst performance and low specific surface area of ​​catalysts, and achieve the effect of improving contact and increasing activity

Active Publication Date: 2020-05-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the technical problems to be solved by the present invention is to disclose a kind of catalyst that is used for the oxidation of n-butane to maleic anhydride for the problem that the specific surface area of ​​the catalyst is low in the prior art, which affects the performance of the catalyst. Its novel pore-making method, Produced a specific surface area of ​​20-35m 2 / g of catalyst, thus improving the performance of the catalyst

Method used

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  • Preparation method of catalyst for improving the yield of n-butane oxidation to maleic anhydride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 1 part of vanadium pentoxide, 1 part of phosphoric acid (100%wt), 0.05 part of zinc acetylacetonate and 300ml of isobutanol solution into a four-neck flask, heat to reflux, and react for 3 hours at a stirring speed of 300r / min. Add 0.3 parts of P123 into the reaction system, continue to stir and reflux for 10 hours, stop heating and filter the mixed solution, heat-treat the filter cake at 400°C to obtain a catalyst with a specific surface area of ​​28m 2 / g. Gained catalyst is reacted with the butane raw material whose molar concentration is 1.5% mol, and its reaction process condition: 2000hr -1 Space velocity and 400°C normal pressure were evaluated in a fixed-bed reactor, and the conversion rate of butane was measured to be 84.5%, and the yield of maleic anhydride was 60.2%. The evaluation results are shown in Table 1.

Embodiment 2

[0026] Add 1 part of vanadium pentoxide, 1 part of phosphoric acid (100%wt), 0.05 part of zinc acetylacetonate and 300ml of isobutanol solution into a four-neck flask, heat to reflux, and react for 3 hours at a stirring speed of 300r / min. Add 0.3 parts of Brij-56 into the reaction system, continue to stir and reflux for 10 hours, stop heating and filter the mixed solution, heat-treat the filter cake at 400°C to obtain a catalyst with a specific surface area of ​​29m 2 / g. Gained catalyst is reacted with the butane raw material whose molar concentration is 1.5% mol, and its reaction process condition: 2000hr -1 Space velocity and 400°C normal pressure were evaluated in a fixed-bed reactor, and the conversion rate of butane was measured to be 84.7%, and the yield of maleic anhydride was 60.4%. The evaluation results are shown in Table 1.

Embodiment 3

[0028] Add 1 part of vanadium pentoxide, 1 part of phosphoric acid (100%wt), 0.05 part of zinc acetylacetonate and 300ml of isobutanol solution into a four-neck flask, heat to reflux, and react for 3 hours at a stirring speed of 300r / min. Add 0.3 parts of pentaerythritol ester into the reaction system, continue to stir and reflux for 10 hours, stop heating and filter the mixed solution, then heat-treat the filter cake at 400°C to obtain a catalyst with a specific surface area of ​​29m 2 / g. Gained catalyst is reacted with the butane raw material whose molar concentration is 1.5% mol, and its reaction process condition: 2000hr -1 Space velocity and 400°C normal pressure were evaluated in a fixed-bed reactor, and the conversion rate of butane was measured to be 84.2%, and the yield of maleic anhydride was 60.5%. The evaluation results are shown in Table 1.

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Abstract

The invention relates to a preparation method of a catalyst capable of increasing yield of maleic anhydride prepared through n-butane oxidation, and mainly solves the problems of low activity of the catalyst due to the fact that active sites and raw materials cannot be sufficiently contacted because of specific surface area of the catalyst in the prior art. The preparation method comprises the steps as follows: mixing a vanadium source compound with a phosphorus source compound in an organic solvent, and performing heating reflux for 3-5 hours under constant stirring; adding a channel template agent into a reaction system and performing heating reflux for 5-10 hours under continuous stirring; filtering and drying an obtained product, and performing heat treatment on filter cakes at 300-500 DEG C to obtain the catalyst. With the adoption of the technical scheme that the channel template agent is added during preparation of a catalyst precursor, the specific surface area and the pore volume of the catalyst are increased, and the activity of the catalyst is improved; the preparation method can be applied to the field of preparation of maleic anhydride through n-butane oxidation.

Description

technical field [0001] The invention relates to a preparation method of a catalyst for improving the yield of maleic anhydride by n-butane oxidation. Background technique [0002] Maleic anhydride, referred to as maleic anhydride, or maleic anhydride, is a commonly used important organic chemical raw material, and is the third largest anhydride in the world after phthalic anhydride and acetic anhydride. Maleic anhydride is widely used in petrochemical, food chemical, pharmaceutical, building materials and other industries, mainly for the synthesis of unsaturated polyester resin, lubricating oil additive, food additive, 1,4-butanediol (BDO), γ-butyrol Esters (GBL), tetrahydrofuran (THF) and a series of important important organic chemicals and fine chemicals. [0003] The early production of maleic anhydride was prepared by the selective oxidation of benzene, but due to the harmfulness of benzene to the human body and the environment, as well as the influence of economic fac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/198C07D307/60
Inventor 顾龙勤徐俊峰曾炜陈亮赵欣王丹柳曹艳萍
Owner CHINA PETROLEUM & CHEM CORP