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Vanadium-phosphorus oxide catalyst and preparation method thereof

A catalyst, vanadium phosphorus oxide technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic chemistry, etc., can solve the problems of insufficiently concentrated particle size distribution, uneven grain size distribution, etc. The effect of centralized degree distribution and stable process control

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

AI Technical Summary

Problems solved by technology

However, a large amount of polyethylene glycol dispersant is added in the preparation process of this method, and the obtained product has the problems of uneven grain size distribution and insufficient concentration of particle size distribution, and the activity and selectivity of the catalyst still need to be further improved.

Method used

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  • Vanadium-phosphorus oxide catalyst and preparation method thereof
  • Vanadium-phosphorus oxide catalyst and preparation method thereof
  • Vanadium-phosphorus oxide catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] exist figure 1 In the ebullating bed reactor shown, 30.0 g of vanadium pentoxide; 690 mL of mixed solution of isobutanol and benzyl alcohol is added through feed port 1, and the volume ratio of isobutanol / benzyl alcohol is 10:1. Will N 2It is blown into the reactor from the feed port 2 to keep the reaction liquid and solid particles in a "boiling" tumbling state. Raise the reaction temperature and keep it at 110±2°C, and keep the reaction time for 3 hours; then feed 38.0 g of concentrated phosphoric acid with a concentration of 85% into the reactor from feed port 1, and the phosphorus / vanadium molar ratio is 1.0. Continue to keep the "boiling" reaction for 6 hours, and the reaction is completed and discharged from the reaction material outlet 3. After the reaction solution was cooled to room temperature, it was filtered, and the filter cake was rinsed three times with a small amount of isobutanol, and then the filter cake was placed in an enamel dish and dried natural...

Embodiment 2

[0056] exist figure 1 In the ebullating bed reactor shown, add 30g of vanadium pentoxide, 0.3g of ferric nitrate as auxiliary agent, 0.5g of zirconium nitrate as auxiliary agent; The volume ratio is 15:1. Will N 2 It is blown into the reactor from the feed port 2 to keep the reaction liquid and solid particles in a "boiling" tumbling state. Raise the reaction temperature and keep it at 100±2°C, and keep the reaction time for 4 hours; then feed 35.5g of concentrated phosphoric acid with a concentration of 100% into the reactor from the feed port 1, and the phosphorus / vanadium molar ratio is 1.1, and continue to maintain " Boiling shape" was reacted for 6 hours, and the reaction was completed and discharged from the reaction material outlet 3. After the reaction solution was cooled to room temperature, it was filtered. After the filter cake was rinsed with a small amount of isobutanol three times, the filter cake was placed in an enamel dish and dried naturally at room temper...

Embodiment 3

[0061] exist figure 1 In the ebullating bed reactor shown, 30.0 g of vanadium pentoxide; 690 mL of mixed solution of isobutanol and benzyl alcohol is added through feed port 1, and the volume ratio of isobutanol / benzyl alcohol is 20:1. Helium is blown into the reactor from the feed port 2 to keep the reaction liquid and solid particles in a "boiling" tumbling state. Raise the reaction temperature and keep it at 98±2°C, and keep the reaction time for 4 hours; then feed 34.0 g of concentrated phosphoric acid with a concentration of 95% into the reactor from feed port 1, and the phosphorus / vanadium molar ratio is 1.0. Continue to keep the "boiling" reaction for 8 hours, and the reaction is completed and discharged from the reaction material outlet 3. After the reaction solution was cooled to room temperature, it was filtered, and the filter cake was rinsed three times with a small amount of isobutanol, and then the filter cake was placed in an enamel dish and air-dried at room t...

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Abstract

The invention discloses a vanadium-phosphorus oxide catalyst and a preparation method thereof. The vanadium-phosphorus oxide catalyst has the specific surface area of 120 to 220 m<2> / g, and the grain size of less than 120 nm. The preparation method comprises the following steps: adding a mixture of isobutanol and benzyl alcohol, vanadium pentoxide and an additive into a fluidized bed reactor, introducing a fluid into the reactor, so that the materials in a boiling rolling state; heating the reactor to a reaction temperature for reacting; introducing a certain amount of concentrated phosphoric acid into the reactor, and keeping the boiling state to obtain a blue or light blue slurry reaction liquid; filtering the reaction liquid to obtain a filtrate; washing, drying and roasting the filtrate to obtain a precursor of the vanadium-phosphorus oxide catalyst; activating the precursor to obtain the vanadium-phosphorus oxide catalyst. The catalyst is small in grain size, large in specific surface area, high in strength and low in abrasion; when the catalyst is used for a catalytic reaction for preparing maleic anhydride by oxidizing n-butane, the conversion rate of n-butane is high, and the maleic anhydride selectivity is high.

Description

technical field [0001] The invention belongs to catalyst preparation technology, and relates to a vanadium phosphorus oxygen catalyst and a preparation method thereof. Background technique [0002] Maleic anhydride, referred to as maleic anhydride, also known as maleic anhydride, is an important organic chemical raw material and fine chemical product. It is currently the third largest anhydride in the world after phthalic anhydride and acetic anhydride. Its specific applications mainly include Production of unsaturated polyester resins, alkyd resins, pesticides, pharmaceuticals, coatings, inks, lubricating oil additives, paper chemicals, textile finishing agents, food additives and surfactants, etc. In addition, maleic anhydride can also be used as a raw material to produce a series of fine chemical products with wide applications, such as 1,4-butanediol, tetrahydrofuran, maleic acid, fumaric acid and tetrahydroanhydride. The development and utilization prospects are very br...

Claims

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Application Information

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IPC IPC(8): B01J27/198C07D307/60
Inventor 薛冬吕振辉乔凯王海波宋丽芝勾连科
Owner CHINA PETROLEUM & CHEM CORP
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