Preparation method for vanadium-phosphorus oxide catalyst

A catalyst, vanadium phosphorus oxygen technology, applied in chemical instruments and methods, physical/chemical process catalysts, organic chemistry, etc., can solve the problems of unsatisfactory catalyst performance, insufficient concentration of particle size distribution, uneven grain size distribution, etc., to achieve crystal Concentrated particle size distribution, large contact surface, and high mass and heat transfer efficiency

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

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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.
[0010]

Method used

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  • Preparation method for vanadium-phosphorus oxide catalyst
  • Preparation method for vanadium-phosphorus oxide catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] 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 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 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 ends. Adjust the reactor temperature and keep it at 120±2°C. Continue to blow gas, keep "boiling state" for 6 hours, and distill off the solvent to obtain catalyst precursor powder. Then, within the temperature range of 240±2° C., the catalyst matrix powder is roasted for 5 hours in a “b...

Embodiment 2

[0061] 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 97±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 through the feed port 1, and the phosphorus / vanadium molar ratio is 1.1, and continue to maintain " Boiling shape "reacted for 5 hours, and the reaction ended. Adjust the reactor temperature and keep it at 140±2°C. Continue to blow gas, keep "boiling state" for 6 hours, and distill off the solvent to obtain catalyst precursor powder. Then, within the temperature range of 250±2° C., the catalyst matrix powder is roasted for 6 hours in a “boiling state”...

Embodiment 3

[0066] 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 6 hours, and the reaction ends. Adjust the reactor temperature and keep it at 120±2°C. Continue to blow the gas, keep "boiling state" for 8 hours, and distill off the solvent to obtain the catalyst precursor powder. Then, within the temperature range of 240±2° C., the catalyst matrix powder is roasted for 4 hours in a “...

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Abstract

The invention discloses a preparation method for a vanadium-phosphorus oxide catalyst. The method comprises the following steps: (1) 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 are 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; (2) performing drying and roasting treatment on the materials in the step (1) to obtain a precursor of the vanadium-phosphorus oxide catalyst, wherein the materials are kept in a boiling state during the process; (3) introducing an activated gas into the reactor, and performing activation treatment on the precursor of the catalyst to obtain the vanadium-phosphorus oxide catalyst, wherein the materials are kept in a boiling state during the process. The method is simple in process, high in production efficiency, and high in repeatability; the prepared 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, in particular to a preparation method of vanadium phosphorus oxygen catalyst. 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 broad. [...

Claims

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Application Information

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IPC IPC(8): B01J27/198C07D307/60B82Y40/00
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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