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Vanadium phosphorus oxide catalyst for producing maleic anhydride and preparation method for catalyst

A technology of maleic anhydride and catalyst, applied in the field of compound preparation, can solve the problems of complex catalyst preparation process, not many advantages, disproportionate input cost and output, etc.

Active Publication Date: 2016-02-03
XIAN ORIGIN CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The VPO catalyst prepared by this method has better catalytic activity, but compared with the catalyst prepared by the low-cost conventional method, the overall activity of the two is not much different, so the high-cost "bubbling bed" system does not have too much difference. multiple advantages
[0009] Although many scientific researchers in this field have done a lot of related work, as mentioned above, the existing disclosed VPO catalyst preparation technology also has the following technical defects: (1) The catalyst composition is complex, and the use of rare elements will increase the catalyst preparation. Cost; (2) The catalyst preparation process is complicated; (3) The catalyst activity is low, resulting in a generally high reaction temperature, and the maleic anhydride selectivity is also low; (4) The application of some new processes leads to a disproportionate input cost and output

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  • Vanadium phosphorus oxide catalyst for producing maleic anhydride and preparation method for catalyst

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Embodiment 1

[0104] Preparation of vanadium phosphorus oxygen catalyst of the present invention

[0105] The implementation steps of this embodiment are as follows:

[0106] A. Preparation of heteropolyacid solution

[0107] At a temperature of 25°C, according to the mass ratio of heteropoly acid to methanol organic solvent of 1:30, the phosphotungstic heteropoly acid sold by Bailingwei Technology Co., Ltd. under the trade name phosphotungstic acid was dissolved in the organic solvent to obtain A solution of heteropolyacid;

[0108] B. Preparation of catalyst precursor

[0109] According to the molar ratio of phosphotungstic heteropoly acid to vanadium pentoxide of 0.02:1, add the heteropoly acid solution obtained in step A and vanadium pentoxide to the mixture composed of benzyl alcohol and isobutanol in a volume ratio of 2:1 In the solvent, the ratio of the mixed solvent in milliliters to the vanadium pentoxide in grams is 1:0.05, mix well to obtain a reaction mixture, and then let th...

Embodiment 2

[0122] Preparation of vanadium phosphorus oxygen catalyst of the present invention

[0123] The implementation steps of this embodiment are as follows:

[0124] A. Preparation of heteropolyacid solution

[0125] At a temperature of 80°C, according to the mass ratio of heteropoly acid to water of 1:50, the silicotungstic heteropoly acid sold by Sinopharm under the trade name of silicotungstic acid, hydration, was dissolved in water to obtain a heteropoly acid solution;

[0126] B. Preparation of catalyst precursor

[0127] According to the molar ratio of heteropoly acid to vanadium pentoxide 1:0.0.06, add the heteropoly acid solution and vanadium pentoxide obtained in step A to the mixture composed of benzyl alcohol and isobutanol in a volume ratio of 8:10 In the solvent, the ratio of the mixed solvent in milliliters to the vanadium pentoxide in grams is 1:0.16, mix well to obtain a reaction mixture, and then let the reaction mixture be heated to a temperature of 120°C at a h...

Embodiment 3

[0140] Preparation of vanadium phosphorus oxygen catalyst of the present invention

[0141] The implementation steps of this embodiment are as follows:

[0142] A. Preparation of heteropolyacid solution

[0143] At a temperature of 10°C, according to the mass ratio of the heteropoly acid to the isobutanol organic solvent of 1:5, the silicon molybdenum heteropoly acid sold by Bailingwei Technology Co., Ltd. under the trade name 12-molybdenum heteropoly acid hydrate was dissolved in the In the organic solvent, obtain a kind of heteropolyacid solution;

[0144] B. Preparation of catalyst precursor

[0145] According to the molar ratio of heteropoly acid to vanadium pentoxide 1:0.001, add the heteropoly acid solution and vanadium pentoxide obtained in step A to the mixed solvent composed of benzyl alcohol and isobutanol in a volume ratio of 6:5 , the ratio of mixed solvent in milliliters to vanadium pentoxide in grams is 1:0.01, mix uniformly to obtain a reaction mixture, then ...

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Abstract

The present invention relates to a vanadium phosphorus oxide catalyst for producing maleic anhydride and a preparation method for the catalyst. The preparation method comprises the steps of: preparing a heteropoly acid solution; preparing a catalyst precursor; shaping; baking and the like. For the preparation method for the VPO catalyst provided by the invention, heteropoly acid is added to prepare the catalyst precursor for the first time, thereby effectively increasing the activity and the selectivity of the catalyst. Compared with the prior art, the conversion rate of n-butane is improved by 1-2% and the selectivity of maleic anhydride is increased by 2-3%. The preparation method for the catalyst provided by the invention simplifies the preparation process, and solves the problem that the bed temperature is difficult to control when the VPO catalyst is activated. The VPO catalyst prepared by the preparation method provided by the invention has a reaction temperature which is about 30 DEG C lower than that of an existing commercial catalyst and has a good application prospect.

Description

【Technical field】 [0001] The invention belongs to the technical field of compound preparation. More specifically, the present invention relates to a vanadium-phosphorus-oxygen catalyst for producing maleic anhydride, and also relates to a preparation method of the vanadium-phosphorus-oxygen catalyst. 【Background technique】 [0002] Maleic anhydride (referred to as maleic anhydride), also known as maleic anhydride, is widely used in the technical fields of synthetic resins, coatings, lubricating oil additives, medicine and food additives, and is the third largest organic anhydride besides acetic anhydride and phthalic anhydride. Due to its unique structural characteristics, maleic anhydride has strong reactivity and can be further reacted to synthesize unsaturated polyester resins. It can also be used as a raw material for the preparation of 1,4-butanediol and tetrahydrofuran organic compounds. It is an important chemical industry. Raw materials and intermediates. In recent...

Claims

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Application Information

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IPC IPC(8): B01J31/24B01J31/34C07D307/60
Inventor 任涛李选志王雁杨军曹晓玲王亚利
Owner XIAN ORIGIN CHEM TECH
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