Preparation method for high-efficiency catalyst of fixed bed vinyl acetate synthetic reaction

A vinyl acetate synthesis reaction technology, applied in the direction of catalyst activation/preparation, carboxylate preparation, chemical instruments and methods, etc., can solve the problems of low VAC yield, low catalyst loss activity, many by-products, etc., to achieve improvement Quality, sufficient activation, and the effect of broadening the activation conditions

Inactive Publication Date: 2018-10-12
MULINSEN ACTIVATED CARBON JIANGSU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved in the present invention is to design a high-efficiency fixed-bed vinyl acetate synthesis reaction catalys

Method used

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  • Preparation method for high-efficiency catalyst of fixed bed vinyl acetate synthetic reaction
  • Preparation method for high-efficiency catalyst of fixed bed vinyl acetate synthetic reaction
  • Preparation method for high-efficiency catalyst of fixed bed vinyl acetate synthetic reaction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Choose 5000g of anthracite as raw material, crush the anthracite to 6 mesh, add auxiliary agent acetic acid liquid according to 1% mass fraction to fully impregnate, let it stand for 2 hours, then add 2% mass fraction of sodium hydroxide mixed solution and stir well, anticorrosion at 0.5Mpa Air-isolated disposal in a pressure vessel for 2 hours. After the above samples are processed, they are transferred to the high-pressure anaerobic activation pilot equipment for activation.

[0032] Stay at 500°C for 1h, then raise the temperature to 800°C and stay for 2h, use a corrosion-resistant tube to feed the activator, which is a mixture of high-temperature water vapor and carbon dioxide in equal proportions, and the flow rate is 0.5m 3 / min, the internal pressure is maintained at 0.3MPa, and the activation equipment is kept airtight.

[0033] The material is expanded through the pressure relief aperture, and then enters the dilute hydrochloric acid liquid with a mass fractio...

Embodiment 2

[0036] The raw material is 4000g of coconut shell carbonized material, crush the coconut shell carbonized material to 10 mesh, add additives such as acetic acid, dilute hydrochloric acid, nitric acid and other proportions according to the mass fraction of 3%, and mix the liquid for full impregnation, let it stand for 1 hour, and then add 4% mass fraction The sodium hydroxide ratio mixed solution was stirred well, and it was treated in a 0.8Mpa anti-corrosion pressure vessel with air isolation for 1 hour. After the above samples are processed, they are transferred to the high-pressure anaerobic activation pilot equipment for activation.

[0037] Stay at 800°C for 1h, then raise the temperature to 1000°C and stay for 2h, use a corrosion-resistant tube to feed the activator, which is a mixture of high-temperature water vapor and carbon dioxide in equal proportions, and the flow rate is 2m 3 / min, the internal pressure is maintained at 0.8MPa, and the activation equipment is kept ...

Embodiment 3

[0041] The raw material is 3000g of coconut shell carbonized material, and the coconut shell is carbonized and crushed to 10 meshes, and the auxiliary agent acetic acid, dilute hydrochloric acid, nitric acid and other proportions are added according to the mass fraction of 4%. Stir the sodium hydroxide ratio mixture fully, and treat it in a 0.7Mpa anti-corrosion pressure vessel with air isolation for 3 hours. After the above samples are processed, they are transferred to the high-pressure anaerobic activation pilot plant for activation.

[0042] Stay at 900°C for 1h, then raise the temperature to 1050°C and stay for 2h, use a corrosion-resistant tube to feed the activator, which is a mixture of high-temperature water vapor and carbon dioxide in equal proportions, and the flow rate is 1m 3 / min, the internal pressure is maintained at 0.7MPa, and the activation equipment is kept airtight.

[0043] After the material is expanded through the pressure relief aperture and cooled, i...

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Abstract

The invention relates to a preparation method for a high-efficiency catalyst of a fixed bed vinyl acetate synthetic reaction. The method comprises the following steps: step 1, selecting materials frombase carbon; step 2, performing acidification treatment; step 3, performing alkalization treatment; step 4, performing pressurization for isolating air; step 5, performing composite activation; step6, performing loading; and step 7, obtaining a finished product. The preparation method provided by the invention has the beneficial effects that the method breaks through a raw material infiltrationtreatment technology, and is more beneficial to activation pore formation; the method broadens selectivity of types of an activator and opens up a new activation pathway; the method broadens activation conditions and makes activation more full; and moreover, the method greatly improves quality of the activated carbon catalyst.

Description

technical field [0001] The invention relates to the field of activated carbon catalyst production, in particular to a method for preparing a high-efficiency fixed-bed vinyl acetate synthesis reaction catalyst. Background technique [0002] At present, the VAC in the acetylene method fixed bed gas phase synthesis of vinyl acetate industry uses zinc acetate loaded activated carbon Zn(AC) 2 As a catalyst, 170-200°C, acetylene / acetic acid molar ratio 5-8, reaction pressure 0.12-0.14Mpa (absolute pressure), under these conditions a synthesis reaction occurs, the mechanism is as follows: [0003] [0004] The reaction is an exothermic reaction, H=-118.29KJ / mol, and is accompanied by many side reactions and dozens of by-products such as benzene series, acetaldehyde, and crotonaldehyde. [0005] Choosing a high-quality catalyst will greatly promote the increase in daily output, prolong the service life, reduce the cost of reactor start-up, and reduce the number of catalyst repla...

Claims

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Application Information

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IPC IPC(8): B01J21/18B01J31/04B01J31/26B01J31/34B01J35/10B01J37/02B01J37/08C07C67/04C07C69/15
CPCB01J21/18B01J31/04B01J31/26B01J31/34B01J35/1028B01J35/1047B01J35/1061B01J37/0201B01J37/08C07C67/04C07C69/15
Inventor 汤海涌滕勇升彭峰
Owner MULINSEN ACTIVATED CARBON JIANGSU
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