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

A catalyst, vanadium phosphorus oxide technology, applied in physical/chemical process catalysts, chemical instruments and methods, organic chemistry, etc., can solve problems such as increasing the yield of maleic anhydride, achieve improved selectivity, increase specific surface area, and simple process Effect

Active Publication Date: 2018-07-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the current production route using n-butane as raw material occupies a dominant position in the production of maleic anhydride, the catalyst needs to further improve its activity and selectivity to increase the yield of maleic anhydride

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Add 127.2g V to a 3L round bottom flask 2 O 5 , the mixed solution of 1350mL isobutanol and 150mL benzyl alcohol was heated and stirred to reflux for 3 hours, 10.0g of polyethylene glycol with a molecular weight of 1500 was added to it, 150g of 105wt% phosphoric acid was added dropwise and heated and stirred to reflux for 16 hours, The V / P feeding molar ratio was 1 / 1.15, and the resulting pellet was centrifuged and washed with absolute ethanol and then dried at 120° C. for 12 hours. The dried catalyst precursor powder was added to graphite with a mass ratio of 3 / 97 to the catalyst precursor powder, mixed uniformly and heated in air at 250°C for 5 hours, and then the powder was pressed into a cylindrical structure with a height of 3mm and a diameter of 6mm. material, the density of this structure is 1.2g / cm 3 , the obtained catalyst precursor structure was heated to 375°C at a heating rate of 2.5°C / min in an air atmosphere, and then the atmosphere was changed to a mixe...

Embodiment 2

[0071] Add 127.2g V to a 3L round bottom flask 2 O 5 , the mixed solution of 1250mL isobutanol and 250mL benzyl alcohol was heated and stirred to reflux for 3 hours, 20.0g of polyethylene glycol with a molecular weight of 2000 was added to it, 156g of 105wt% phosphoric acid was added dropwise and heated and stirred to reflux for 20 hours, The V / P feeding molar ratio was 1 / 1.20, and the resulting pellet was centrifuged and washed with absolute ethanol and then dried at 120° C. for 12 hours. The dried catalyst precursor powder was added to graphite with a mass ratio of 3 / 97 to the catalyst precursor powder, mixed uniformly and heated in air at 250°C for 5 hours, and then the powder was pressed into a cylindrical structure with a height of 3mm and a diameter of 13mm. material, the density of this structure is 1.22g / cm 3 , the obtained catalyst precursor structure was heated to 375°C at a heating rate of 2.5°C / min in an air atmosphere, and then the atmosphere was changed to a mi...

Embodiment 3

[0075] Add 127.2g V to a 3L round bottom flask 2 O 5 , the mixed solution of 1250mL isobutanol and 250mL benzyl alcohol was heated and stirred to reflux for 3 hours, 10.0g of polyethylene glycol with a molecular weight of 6000 was added to it, 130g of 105wt% phosphoric acid was added dropwise and heated and stirred to reflux for 10 hours, The V / P feeding molar ratio was 1 / 1, and the resulting precipitate was centrifuged and washed with absolute ethanol and then dried at 120° C. for 12 hours. The dried catalyst precursor powder was added to graphite with a mass ratio of 5 / 95 to the catalyst precursor powder, mixed uniformly and heated in air at 250°C for 5 hours, and then the powder was pressed into a cylindrical structure with a height of 3mm and a diameter of 6mm. material, the density of this structure is 1.12g / cm 3 , the obtained catalyst precursor structure was heated to 375°C at a heating rate of 2.5°C / min in an air atmosphere, and then the atmosphere was changed to a m...

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Abstract

The invention provides a vanadium phosphorus oxide catalyst for preparing maleic anhydride from n-butane through oxidation. The vanadium phosphorus oxide catalyst is prepared by treating a vanadium phosphorus oxide catalyst matrix with a pore-enlarging agent; the mass content of elemental vanadium in the catalyst is 28 to 35%; the mass content of elemental phosphorus in the catalyst is 15 to 25%;and the pore-enlarging agent comprises one or more selected from a group consisting of 1,1,1-trimethylolethane, trimethylolpropane, phthalic anhydride, maleic anhydride, tartaric acid, and citric acidor In many cases, and a mass ratio of the pore-enlarging agent to the vanadium phosphorus oxide catalyst matrix is (5-20): (80-95). According to the invention, the pore-enlarging agent is added and the removal process of the pore-enlarging agent is controlled in the post-treatment process of the catalyst, so the specific surface area and the pore structure of the treated catalyst can be controlled and improved; and thus, the activity of the catalyst in catalysis of the selective oxidation of butane and the selectivity of produced maleic anhydride are improved.

Description

technical field [0001] The invention belongs to the technical field of catalyst synthesis, and relates to a vanadium phosphorus oxide catalyst for producing maleic anhydride by oxidation of n-butane and a preparation method thereof. The catalyst is suitable for the catalytic reaction process of producing maleic anhydride by oxidation of n-butane, and more specifically , the present invention relates to catalysts that provide improved catalytic performance. Background technique [0002] Maleic anhydride (maleic anhydride) is an important organic chemical raw material and fine chemical product. It is the third largest acid anhydride in the world after phthalic anhydride and acetic anhydride. It is mainly used in the production of thermosetting resins and unsaturated polyesters. Resins are used in pesticides, pharmaceuticals, coatings, inks, lubricant additives, paper chemicals, textile chemicals, textile finishing agents, food additives, and surfactants. In addition, maleic a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/198C07D307/60
CPCB01J27/198C07D307/60
Inventor 师慧敏张明森张东顺贾雪飞冯晔张作峰苗小培
Owner CHINA PETROLEUM & CHEM CORP
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