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Catalyst grading method for preparing maleic anhydride through oxidation of n-butane

A catalyst and n-butane technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, organic chemistry, etc., can solve the problems of reducing production efficiency, prolonging the stable period, reducing the effective volume of the reactor, etc., to improve efficiency, Reduce the hot spot temperature and reduce the effect of reaction hot spots

Active Publication Date: 2017-05-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • Catalyst grading method for preparing maleic anhydride through oxidation of n-butane
  • Catalyst grading method for preparing maleic anhydride through oxidation of n-butane
  • Catalyst grading method for preparing maleic anhydride through oxidation of n-butane

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preparation example Construction

[0045] (2) Preparation of vanadium phosphorus oxygen catalyst

[0046] The vanadium phosphorus oxide obtained in step (1) is first shaped, and the shape of the obtained vanadium phosphorus oxygen catalyst can be a compressed tablet, a spherical shape, an extruded rod, etc., and the phase of the obtained catalyst precursor is (VOHPO 4 0.5H 2 o).

[0047] (3) Oxidation treatment of vanadium phosphorus oxygen catalyst

[0048] 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.

[0049] The mass concentration of organic peroxides is generally controlled at 0.1-10%.

[0050] (4) Activation of vanadium phosphorus oxygen catalyst

[0051] After the impregnation in step (3), it is filtered and dried, and the dried catalyst is activated in a nitrogen or inert gas atmospher...

Embodiment 1

[0058] 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, and the reaction was completed. 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 t...

Embodiment 2

[0063] 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 for preparing maleic anhydride through oxidation of n-butane. The method comprises that n-butane and air are mixed, the mixed reaction gas passes through three or more double-tandem vanadium phosphorus oxide catalyst beds in parallel, under oxidative reaction conditions, the reaction gas contacts with the vanadium phosphorus oxide catalyst and undergoes a reaction, and in an order of contact with mixed reaction gas, a grading loading process is carried out according to a tendency of increasing the average valence of vanadium in the three or more tandem catalyst beds, then reducing the average valence and then increasing the average valence so that the activity distribution of the catalyst is balanced and the catalyst produces full activity. The method can improve the concentration of n-butane in the feed, reduce the reaction hot spot of the bed, make the bed temperature distribution average, effectively inhibit the side reaction, improve product selectivity and increase a product maleic anhydride yield.

Description

technical field [0001] The invention relates to a method for producing maleic anhydride by n-butane oxidation, in particular to a catalyst gradation method for producing maleic anhydride by n-butane oxidation. 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 advent of the new method of maleic anhydride esterification and low-pressure hydrogenation to produce 1,4-butanediol make...

Claims

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Application Information

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IPC IPC(8): B01J27/198C07D307/60
Inventor 王海波刘新宇勾连科宋丽芝侯学伟
Owner CHINA PETROLEUM & CHEM CORP
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