Catalyst for preparing maleic anhydride by oxidizing n-butane as well as preparation method and application of catalyst

A catalyst and a technology for n-butane, which are applied in the field of n-butane oxidation to maleic anhydride catalyst and its preparation field, can solve the problems of increasing the complexity of the process, increasing the additional production cost of the catalyst, etc., so as to avoid deep oxidation, improve profits, and reduce costs Effect

Pending Publication Date: 2021-10-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this process, the carrier needs special handling and processing, which not only increases the complexity of the process but also increases the additional production cost of the catalyst

Method used

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  • Catalyst for preparing maleic anhydride by oxidizing n-butane as well as preparation method and application of catalyst
  • Catalyst for preparing maleic anhydride by oxidizing n-butane as well as preparation method and application of catalyst
  • Catalyst for preparing maleic anhydride by oxidizing n-butane as well as preparation method and application of catalyst

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0058] Preparation of catalyst precursor:

[0059] 100g V 2 o 5 , 120g 105% phosphoric acid, 26g Bi(NO 3 ) 3 ·5H 2 O is placed in a 3L three-necked flask, then add 1000mL of isobutanol and 500ml of benzyl alcohol, heat the above mixture to reflux temperature, reflux for 18 hours, and then drop to room temperature to obtain a catalyst slurry, which is centrifuged and used for many times. Wash it with isobutanol, then put it into a 100°C oven and dry it for 24 hours, then transfer it to a muffle furnace, and bake it at 180-280°C for 3-10 hours, and mix the calcined catalyst precursor powder with 4% graphite Mixed and pressed into a certain shape to obtain a catalyst precursor.

Embodiment 1

[0061] The calcined catalyst powder is mixed with 4% graphite (with a particle size of 6-20 μm), and the mixture is pressed into a clover shape, and placed in an activation furnace for direct activation.

[0062] The first step of activation: the catalyst precursor is raised from room temperature to 430°C, and the heating rate is 4°C / min; is 1.0L / min, and the corresponding airspeed is 800h -1 . The second step of activation: the catalyst was kept at 430°C for 1 hour, then the air was replaced with nitrogen, the flow rate of nitrogen was also 1.0 L / min, and the water vapor remained unchanged, and kept at this temperature for 6 hours.

[0063] Set the specific surface area to 10.0m 2 / g silicon nitride is ground into powder to form particles with a size of 10 μm; the above-mentioned catalyst is also ground into matrix powder with a particle size of about 200-800 mesh, which is fully mixed with the above-mentioned inert carrier particles and pressed into flakes. The content in...

Embodiment 2

[0068] The calcined catalyst powder is mixed with 4% graphite (with a particle size of 6-20 μm), and the mixture is pressed into a clover shape, and placed in an activation furnace for direct activation.

[0069] The first step of activation: the catalyst precursor is raised from room temperature to 430°C, and the heating rate is 4°C / min; is 1.0L / min, and the corresponding airspeed is 800h -1 . The second step of activation: the catalyst was kept at 430°C for 1 hour, then the air was replaced with nitrogen, the flow rate of nitrogen was also 1.0 L / min, and the water vapor remained unchanged, and kept at this temperature for 6 hours.

[0070] Set the specific surface area to 2.0m 2 / g aluminum nitride is ground into powder to form particles with a size of 30 μm; the above-mentioned catalyst is also ground into matrix powder with a particle size of about 200-800 mesh, which is fully mixed with the above-mentioned inert carrier particles and pressed into flakes. Aluminum nitrid...

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Abstract

The invention discloses a catalyst for preparing maleic anhydride by oxidizing n-butane as well as a preparation method and application of the catalyst. The catalyst comprises a catalyst substrate and an inert carrier, the catalyst substrate comprises vanadium phosphorus oxide, and the inert carrier is an inert heat conduction material. The inert carrier is selected from at least one of silicon nitride, aluminum nitride and boron nitride. The preparation method comprises the following steps: uniformly mixing the inert carrier and the catalyst matrix powder, carrying out compression molding, crushing, adding the pore-forming agent, repeating the molding and crushing processes for 2-10 times, molding, and carrying out heat treatment to obtain the catalyst. By adopting the inert carrier, hot spots of the reaction can be diluted, a local specific inert region can be formed, heat in the oxidation reaction process can be transferred, deep oxidation of maleic anhydride is avoided, and the selectivity of the catalyst is improved.

Description

technical field [0001] The invention relates to the field of chemical catalysts, in particular to a catalyst for producing maleic anhydride by n-butane oxidation and its preparation method and application. Background technique [0002] Maleic anhydride (referred to as maleic anhydride) is an organic chemical raw material and is currently the second largest organic anhydride after phthalic anhydride. It is mainly used in the production of fine chemical products such as unsaturated polyester resin, 1,4 butanediol, γ-butyrolactone and fumaric acid, and is mainly used in coatings, food, pesticides, medicine and textile industries. The largest use of maleic anhydride is to produce unsaturated polyester resin (UPR), and the second largest use is to synthesize 1,4-butanediol. The consumption of the two can account for more than 60% of the consumption of maleic anhydride. According to the source of raw materials, domestic production of maleic anhydride is divided into n-butane meth...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J27/198C07D307/60
CPCB01J27/24B01J27/198B01J37/0018C07D307/60
Inventor 张东顺师慧敏张作峰冯晔安欣袁滨
Owner CHINA PETROLEUM & CHEM CORP
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