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Vanadium phosphorus oxide catalyst as well as preparation method and application thereof

A vanadium phosphorus oxide and catalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of small specific surface area and pore volume, unsatisfactory conversion rate of reactants and maleic anhydride yield , the problem of uneven particle size distribution of vanadium phosphorus oxide catalyst, to achieve the effect of uniform particle size distribution, avoid particle agglomeration, and control the reaction rate

Pending Publication Date: 2022-05-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that the particle size distribution of the vanadium phosphorus oxygen catalyst prepared in the prior art is not uniform, the specific surface area and pore volume are small, resulting in the unsatisfactory conversion rate of the reactant and the yield of maleic anhydride, the invention provides a preparation of the vanadium phosphorus oxygen catalyst Method, through the improvement of the preparation method, the catalyst with relatively concentrated particle size and increased specific surface area and pore volume can be prepared, which can be used in the catalytic reaction of n-butane oxidation to maleic anhydride, the conversion rate of n-butane and the selection of maleic anhydride improved sex

Method used

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  • Vanadium phosphorus oxide catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]Using a four-necked flask with a stirring and reflux cooling device, add 100g of isobutanol and 25.0g of vanadium pentoxide into the four-necked flask, start stirring, and heat up to 95°C; mix 380g of isobutanol with a weight percentage of 100 37g of concentrated phosphoric acid in a high-speed shear homogenizer was stirred and mixed evenly, and kept at 70°C, and then this part of the mixture of isobutanol and phosphoric acid was added to the reactor at a constant speed for 7 hours. Dissolution coprecipitation reaction, keeping the reaction temperature at 105°C, and continuing the reaction for 16 hours to obtain a blue paste-colored suspension of the vanadium phosphorus oxygen catalyst precursor, the reaction product was vacuum filtered and dried after cooling down to room temperature. The filter cake in the suction filtration process was washed three times with isobutanol, the filter cake was naturally air-dried at room temperature, then placed in an oven, dried at 120°C...

Embodiment 2

[0035] Using a four-necked flask with a stirring and reflux cooling device, add 45g of isobutanol and 5.0g of vanadium pentoxide into the four-necked flask, add 0.06g of ferric sulfate as an additive, start stirring, and heat up to 90°C; 52g of isobutanol Butanol and 5.5g of concentrated phosphoric acid with a weight percentage of 110% were stirred and mixed evenly in a high-speed shear homogenizer, and kept at 70°C, and then this part of the mixture of isobutanol and phosphoric acid was controlled for 4 hours. Add a uniform flow into the reactor for dissolution and co-precipitation reaction, keep the reaction temperature at 100°C, and continue the reaction for 8 hours to obtain a blue paste-colored suspension of the vanadium phosphorus oxide catalyst precursor. The reaction product is reduced to room temperature and vacuum pumped Filter and dry. The filter cake in the suction filtration process was washed three times with isobutanol, the filter cake was air-dried naturally at...

Embodiment 3

[0037] Using a four-necked flask with a stirring and reflux cooling device, add 120g of isobutanol and 10.0g of vanadium pentoxide into the four-necked flask, start stirring, and heat up to 100°C; mix 70g of isobutanol with a weight percentage of 115 % concentrated phosphoric acid 12.2g was stirred and mixed evenly in a high-speed shear homogenizer, and kept at 70°C, and then the mixture of isobutanol and phosphoric acid was added to the reactor at a constant speed for 8 hours. Carry out elution co-precipitation reaction, keep the reaction temperature at 105°C, and continue the reaction for 12 hours to obtain a blue paste-colored suspension of the vanadium phosphorus oxide catalyst precursor. After the reaction product is lowered to room temperature, it is vacuum filtered and dried. The filter cake in the suction filtration process was washed three times with isobutanol, and the filter cake was air-dried at room temperature, then placed in an oven, dried at 120°C for 8 hours, a...

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Abstract

The invention discloses a vanadium phosphorus oxide catalyst which is prepared by the following steps: mixing isobutanol and phosphoric acid to form a solution, dropwise adding or feeding the solution into a mixed solution of isobutanol and vanadium pentoxide, carrying out heat preservation reaction, filtering, drying and roasting the reaction solution to obtain vanadium phosphorus oxide powder, and molding and activating the vanadium phosphorus oxide powder. The phosphoric acid and the vanadium pentoxide are respectively mixed with the isobutanol to form the solution, the mixed solution of the phosphoric acid and the isobutanol is added into the mixed solution of the vanadium pentoxide and the isobutanol for solventing-out operation, and the formed vanadium phosphorus oxide catalyst precursor is more concentrated in particle size, larger in specific surface area and better in catalytic effect.

Description

technical field [0001] The invention relates to the technical field of preparing maleic anhydride from n-butane, in particular to a vanadium-phosphorus-oxygen catalyst. Background technique [0002] Maleic anhydride, referred to as maleic anhydride, is an important organic chemical raw material, which is widely used in the production of thermosetting resins, unsaturated polyester resins, pesticides and fine chemical products, such as for the synthesis of γ-butyrolactone, tetrahydrofuran and 1,4 - An important intermediate of butanediol. In the past, benzene was used as raw material to produce maleic anhydride, but due to the toxicity, unsafety and environmental hazards of benzene, butene was used instead of benzene as raw material to produce maleic anhydride. However, due to the high cost of butene, since the 1970s, the production of maleic anhydride has gradually turned to cheap and easily available butane instead of benzene and butene. In addition to the advantages of ch...

Claims

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Application Information

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IPC IPC(8): B01J27/198B01J35/02B01J35/10B01J37/03B01J37/16C07D307/60
CPCB01J27/198B01J37/03B01J37/16C07D307/60B01J35/50B01J35/23B01J35/40B01J35/613Y02P20/52
Inventor 张霞曹正凯王海波勾连科彭绍忠吕清林
Owner CHINA PETROLEUM & CHEM CORP
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