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Vanadium-phosphorus oxide catalyst for preparing maleic anhydride through butane oxidation, and preparation method thereof

A vanadium phosphorus oxide and catalyst technology, which is applied in physical/chemical process catalysts, chemical instruments and methods, organic chemistry, etc., can solve the problems of increasing catalyst manufacturing costs, uneven grain size distribution, and insufficient particle size distribution. Achieve the effect of regular crystal phase structure, concentrated grain size distribution, and uniform distribution of active centers

Active Publication Date: 2015-05-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation process of this method adds a large amount of polyethylene glycol dispersants, and the obtained product has the problems of uneven grain size distribution and insufficient concentration of particle size distribution, and there is a deficiency that the raw material polyethylene glycol increases the catalyst manufacturing cost.
Although the reaction performance of the vanadium phosphorus oxygen catalyst is better, the activity and selectivity of the catalyst still need to be further improved.

Method used

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  • Vanadium-phosphorus oxide catalyst for preparing maleic anhydride through butane oxidation, and preparation method thereof
  • Vanadium-phosphorus oxide catalyst for preparing maleic anhydride through butane oxidation, and preparation method thereof
  • Vanadium-phosphorus oxide catalyst for preparing maleic anhydride through butane oxidation, and preparation method thereof

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preparation example Construction

[0048] (2) Preparation of vanadium phosphorus oxygen catalyst

[0049] Step (1) The obtained vanadium phosphorus oxide is first formed to obtain a vanadium phosphorus oxygen catalyst intermediate, and then activated; or the obtained vanadium phosphorus oxide is first activated to obtain a vanadium phosphorus oxygen catalyst intermediate, and then formed to obtain vanadium phosphorus oxygen catalyst.

[0050] The shape of the obtained vanadium-phosphorus-oxygen catalyst can be shapes such as pressed sheet, sphere, extruded bar, and the phase of matter of the catalyst is mainly super vanadyl phosphate ((VO 2 ) 2 P 2 o 7 )Mutually.

[0051] The above-mentioned molding process generally includes: adding vanadium phosphorus oxide powder (or activated vanadium phosphorus catalyst intermediate) to graphite powder with a mass fraction of 3% to 5%, after mixing thoroughly, using a rotary tablet press, Properly adjust the impact strength, extrude into a certain shape, such as colum...

Embodiment 1

[0058] exist figure 1 In the impingement flow reactor shown, add isobutanol, benzyl alcohol mixture 500mL, isobutanol / benzyl alcohol volume ratio 10:1, silane coupling agent A-147 0.29g, start the impingement flow reactor, make stirring The rotation speed of the paddle reaches 1500r / min, and the reaction liquid passes through the guide tube to form an impingement flow. Raise the reaction temperature and keep it at 110±2°C, mix 29.53g of vanadium pentoxide and 149mL of isobutanol and benzyl alcohol in a FSH-2 high-speed homogenizer to form a suspension, so that the concentration of 85% Phosphoric acid 44.7g and the above-mentioned suspension were added into the reactor from two inlets of the impingement flow reactor at a certain flow acceleration rate, and the reaction time was maintained for 6 hours to complete the reaction. 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 iso...

Embodiment 2

[0062] exist figure 1 In the impingement flow reactor shown, add 500mL of isobutanol and benzyl alcohol mixture, the volume ratio of isobutanol / benzyl alcohol is 15:1, 0.29g of silane coupling agent A-151, and 0.3g of ferric nitrate hexahydrate , zirconium nitrate 0.5g, start the impingement flow reactor, so that the rotation speed of the stirring blade reaches 2500r / min, and the reaction liquid passes through the guide tube to form an impingement flow. Raise the reaction temperature and keep it at 100±2°C, mix 29.53g of vanadium pentoxide and 149mL of isobutanol and benzyl alcohol in a FSH-2 high-speed homogenizer to form a suspension, so that the concentration of 100% Phosphoric acid 34.98g and the above-mentioned suspension were added into the reactor from two inlets of the impingement flow reactor at a certain flow acceleration rate, and the reaction time was maintained for 6 hours to complete the reaction. After the reaction solution was cooled to room temperature, it wa...

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Abstract

The present invention discloses a vanadium-phosphorus oxide catalyst and a preparation method thereof. According to the vanadium-phosphorus oxide catalyst, a nanometer vanadium-phosphorus oxide is adopted as a precursor, and is sequentially subjected to activation and forming or forming and activation to prepare the vanadium-phosphorus oxide catalyst, wherein the grain size of the nanometer vanadium-phosphorus oxide is less than 100 nm, the grain size distribution adopting the volume as the benchmark is that the content of the particles with the grain size of less than 15 nm is 9-15%, the content of the particles with the grain size of 15-30 nm is 62-80%, and the content of the particles with the grain size of 30-100 nm is 11-23%, and the vanadium-phosphorus oxide is prepared by using an immersion circulating type impinging stream reactor and by adding a silane coupling agent. According to the present invention, with application of the catalyst of the present invention to catalyze the maleic anhydride preparation reaction through the n-butane oxidation, the n-butane conversion rate can achieve 90-95 mol%, and the maleic anhydride selectivity can achieve 75-88 mol%.

Description

technical field [0001] The invention relates to a vanadium phosphorus oxygen catalyst for preparing maleic anhydride by oxidation of butane and a preparation method thereof. The catalyst is suitable for the catalytic reaction process of preparing maleic anhydride by oxidation of n-butane. Background technique [0002] Maleic anhydride, also known as maleic anhydride for short, 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 mal...

Claims

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Application Information

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IPC IPC(8): B01J27/198C07D307/60
Inventor 王海波宋丽芝勾连科薛冬侯学伟范丹丹
Owner CHINA PETROLEUM & CHEM CORP
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