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A kind of method that n-butane oxidation prepares maleic anhydride

A technology of n-butane and maleic anhydride, which is applied in the field of catalyst-graded n-butane oxidation to prepare maleic anhydride, can solve the problems of lowering production efficiency, prolonging the stable period, and reducing the effective volume of the reactor, so as to reduce reaction hot spots and reduce reaction time. The intensity is gentle, and the effect of inhibiting the occurrence of side effects

Active Publication Date: 2019-07-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] USP4,855,459 proposes a method for preparing maleic anhydride by oxidation of n-butane, which is carried out by diluting and packing inert silicon-aluminum balls and catalysts, and reducing the reaction hot spots by diluting and packing at the hot spots of the reaction tube temperature, improve the selectivity of maleic anhydride, the purpose of increasing the yield of maleic anhydride, and at the same time the stability period of the catalyst has been extended, but the unfavorable factor is the addition of inert materials, which reduces the effective volume of the reactor and also reduces the production efficiency
[0007] In the existing fixed-bed n-butane oxidation to maleic anhydride technology, catalysts with different activities are loaded in the reactor along the reactant flow direction, so that the catalytic activity changes from low to high along the feeding direction when the catalyst is loaded, so as to realize the The method of controlling the hot spot of oxidation reaction to improve product selectivity and increase product yield has not been reported so far

Method used

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  • A kind of method that n-butane oxidation prepares maleic anhydride
  • A kind of method that n-butane oxidation prepares maleic anhydride
  • A kind of method that n-butane oxidation prepares maleic anhydride

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preparation example Construction

[0044] (2) Preparation of vanadium phosphorus oxygen catalyst

[0045] The vanadium phosphorus oxide obtained in step (1) is first formed, and the shape of the obtained vanadium phosphorus oxygen catalyst can be a pressed tablet, a spherical shape, an extruded rod, etc., and the phase of the obtained catalyst precursor is (VOHPO4 0.5H 2 o).

[0046] (3) Oxidation treatment of vanadium phosphorus oxygen catalyst

[0047] The catalyst particles obtained in step (2) are immersed in an organic solvent containing a certain concentration of organic peroxide, and the average valence state of vanadium in the catalyst is regulated by controlling the concentration of the organic peroxide.

[0048] The mass concentration of organic peroxides is generally controlled at 0.5% to 10%.

[0049] (4) Activation of vanadium phosphorus oxygen catalyst

[0050] After the impregnation in step (3), it is filtered and dried, and the dried catalyst is activated in a nitrogen or inert gas atmosphere...

Embodiment 1

[0056] exist figure 1 Add 649L of isobutanol and benzyl alcohol mixture to the reaction kettle shown with a stirring device and a reflux condensing device, the volume ratio of isobutanol / benzyl alcohol is 10:1, 29.53 kg of vanadium pentoxide, and the auxiliary agent hexahydrate Ferric nitrate 0.3kg, auxiliary agent zirconium nitrate 0.5kg, start stirring, increase the reaction temperature and keep it at 100±2°C, carry out reflux reaction, keep reflux time for 4 hours, then add 34.98kg of phosphoric acid with a concentration of 100%, phosphorus / vanadium The molar ratio was 1.1, the reflux was continued for 4 hours, and the reaction ended. After the reaction solution was cooled to room temperature, it was vacuum filtered, and the filter cake was rinsed three times with a small amount of isobutanol to complete the reaction. After the reaction solution was cooled to room temperature, it was vacuum filtered, and the filter cake was rinsed with a small amount of isobutanol three ti...

Embodiment 2

[0061] exist figure 1 Add 649L of isobutanol and benzyl alcohol mixture to the reaction kettle shown with a stirring device and a reflux condensing device, the volume ratio of isobutanol / benzyl alcohol is 10:1, 29.53 kg of vanadium pentoxide, and the auxiliary agent hexahydrate Ferric nitrate 0.3kg, auxiliary agent zirconium nitrate 0.5kg, start stirring, increase the reaction temperature and keep it at 100±2°C, carry out reflux reaction, keep reflux time for 4 hours, then add 34.98kg of phosphoric acid with a concentration of 100%, phosphorus / vanadium The molar ratio was 1.1, the reflux was continued for 4 hours, and the reaction ended. After the reaction solution was cooled to room temperature, it was vacuum filtered, and the filter cake was rinsed three times with a small amount of isobutanol to complete the reaction. After the reaction solution was cooled to room temperature, it was vacuum filtered, and the filter cake was rinsed with a small amount of isobutanol three ti...

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Abstract

The invention discloses a method of producing maleic anhydride by oxidizing n-butane. The method includes the following steps: mixing the n-butane with air; co-currently enabling the mixed reaction gas to pass through at least two vanadium-phosphorous oxide catalyst bed layers in series to perform a contact reaction with a vanadium-phosphorous oxide catalyst under an oxidizing reaction condition. The average valence of vanadium in a downstream catalyst bed layer is higher than that of vanadium in an upstream catalyst bed layer according to the contact sequence of the catalyst with the mixed reaction gas. The method reduces reaction hot spots in the bed layers and enables temperature distribution in the bed layers to be balanced, thus effectively inhibiting side-reactions, increasing product selectivity and increasing yield of the product, maleic anhydride.

Description

technical field [0001] The invention relates to a method for preparing maleic anhydride from n-butane, in particular a method for preparing maleic anhydride by oxidation of n-butane with catalyst gradation, which can be used in the reaction of preparing maleic anhydride by n-butane oxidation using a fixed bed process process. 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. Its specific applications include the manufacture of unsaturated polyester resins, alkyd resins, maleic acid (maleic acid), fumaric acid (fumaric acid), as well as pesticides, coatings, glass fiber reinforced plastics, lubricating oil additives, paper chemistry Product additives, surfactants, etc. The ad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D307/60B01J27/198
CPCB01J27/198C07D307/60
Inventor 王海波宋丽芝侯学伟勾连科刘新宇
Owner CHINA PETROLEUM & CHEM CORP
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