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Catalyst for preparing maleic anhydride from n-butane through oxidation and preparation method thereof

A catalyst and n-butane technology, applied in the direction of catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of high compressive strength, low compressive strength, high wear rate, etc., and achieve lateral The effect of high compressive strength, low wear rate, and low loss rate

Active Publication Date: 2018-04-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] One of the technical problems to be solved by the present invention is to disclose a catalyst for the oxidation of n-butane to maleic anhydride in view of the low lateral compressive strength and high wear rate of catalyst structures in the prior art. Treat the catalyst precursor under constant temperature and humidity conditions, add a pore-forming agent and perform secondary compression to obtain a catalyst with high lateral compressive strength and low wear rate

Method used

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  • Catalyst for preparing maleic anhydride from n-butane through oxidation and preparation method thereof
  • Catalyst for preparing maleic anhydride from n-butane through oxidation and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Mix 0.5g of phosphomolybdic acid with 100mL of benzyl alcohol and 400mL of isobutanol, then add 50.4g of vanadium pentoxide, then add 70mL of phosphoric acid, heat and reflux under constant stirring for 16 hours, filter and dry the resulting product to obtain a VPO catalyst precursor Powder, sieve the powdery catalyst precursor, take 50g of the precursor less than 200 mesh, and mix it well with 1.5g of graphite powder to form a mixture A; Treat in a wet oven for 12 hours; then compress the tablet under a pressure of 20 MPa to obtain a catalyst structure; then crush it, sieve it, and take the 80-140 mesh part; transfer the above-mentioned pre-granulated particles to a rotary tablet press, and the catalyst The height of the structure is 5mm, and the catalyst structure is obtained, the lateral compressive strength is 131N / cm, and the wear rate is 2.1%; the obtained catalyst is reacted with the butane raw material whose molar concentration is 1.5% mol, and the reaction proce...

Embodiment 2

[0026] Mix 0.5g of phosphomolybdic acid with 100mL of benzyl alcohol and 400mL of isobutanol, then add 50.4g of vanadium pentoxide, then add 70mL of phosphoric acid, heat and reflux under constant stirring for 16 hours, filter and dry the resulting product to obtain a VPO catalyst precursor Powder, sieve the powdery catalyst precursor, take 50g of the precursor less than 200 meshes, mix well with 1.5g graphite powder to form mixture A; ℃, and the relative humidity is 85% in a constant temperature and humidity oven for 12 hours; then press it under a pressure of 20MPa to obtain a one-time molded catalyst structure; The particles are transferred to the rotary tablet press, the height of the catalyst structure is 6mm, and the catalyst structure is obtained, the lateral compressive strength is 118N / cm, and the wear rate is 3.2%; Reaction, its reaction process conditions: 2000hr -1Space velocity and 400°C under normal pressure were evaluated in a fixed-bed reactor, and the convers...

Embodiment 3

[0028] Mix 0.5g of phosphomolybdic acid with 100mL of benzyl alcohol and 400mL of isobutanol, then add 50.4g of vanadium pentoxide, then add 70mL of phosphoric acid, heat and reflux under constant stirring for 16 hours, filter and dry the resulting product to obtain a VPO catalyst precursor Powder, sieve the powdery catalyst precursor, take 50g of the precursor less than 200 meshes, mix well with 1.5g graphite powder to form mixture A; ℃, with a relative humidity of 65% in a constant temperature and humidity oven for 12 hours; then press the tablet under a pressure of 20 MPa to obtain a one-time shaped catalyst structure; then crush it, sieve it, and take the 80-140 mesh part; The particles are transferred to the rotary tablet press, the height of the catalyst structure is 5mm, and the catalyst structure is obtained, the lateral compressive strength is 110N / cm, and the wear rate is 4.4%; Reaction, its reaction process conditions: 2000hr -1 Space velocity and 400°C under norma...

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Abstract

The invention relates to a catalyst for preparing maleic anhydride from n-butane through oxidation. The catalyst mainly overcomes the problem of low catalytic activity in the prior art. According to the invention, three elements consisting of vanadium, phosphorus and oxygen are used as the main body of the catalyst, and a certain amount of a metal additive is cooperatively used. The catalyst comprises, by weight, 22 to 35% of elemental vanadium, 12 to 22% of elemental phosphorus, 35 to 55% of elemental oxygen and 0.01 to 8% of the metal additive. The catalyst is subjected to constant-temperature constant-humidity treatment, doping of a pore forming agent and secondary molding, so the catalysis performance and strength of the catalyst are improved, and the catalyst is applicable to the field of preparation of maleic anhydride from n-butane through oxidation.

Description

technical field [0001] The invention relates to a catalyst for the reaction of producing maleic anhydride by n-butane oxidation and a preparation method thereof. Background technique [0002] Maleic anhydride, referred to as maleic anhydride, or maleic anhydride, is a commonly used important organic chemical raw material, and is the third largest anhydride in the world after phthalic anhydride and acetic anhydride. Maleic anhydride is widely used in petrochemical, food chemical, pharmaceutical, building materials and other industries, mainly for the synthesis of unsaturated polyester resin, lubricating oil additive, food additive, 1,4-butanediol (BDO), γ-butyrol Esters (GBL), tetrahydrofuran (THF) and a series of important important organic chemicals and fine chemicals. [0003] The early production of maleic anhydride was prepared by the selective oxidation of benzene, but due to the harmfulness of benzene to the human body and the environment, as well as the influence of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/199C07D307/60
CPCC07C51/215C07D307/60B01J27/199B01J37/0009B01J35/50
Inventor 赵欣顾龙勤曾炜徐俊峰陈亮王丹柳
Owner CHINA PETROLEUM & CHEM CORP
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