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Technological method for preparing benzaldehyde through methyl benzoate hydrogenation

A technology of methyl benzoate and a process method, which is applied in the field of chemical engineering, can solve problems such as increased hydrogen recycling operating costs, increased separation costs, and difficulty in condensation, and achieves suppression of side reactions, improvement of conversion rate and selectivity, and process methods Simple and easy-to-operate effects

Active Publication Date: 2017-04-26
湖南中岭化工有限责任公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the hydrogen ester molar ratio is 30:1, the conversion rate and selectivity are greatly improved, but a large excess of hydrogen is likely to cause product entrainment, condensation difficulties, and increased separation costs; and under normal pressure, the operating cost of hydrogen recycling is increased.

Method used

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  • Technological method for preparing benzaldehyde through methyl benzoate hydrogenation
  • Technological method for preparing benzaldehyde through methyl benzoate hydrogenation

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Experimental program
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Effect test

Embodiment 1

[0020] 10 g of the catalyst was loaded into a tubular reactor with an inner diameter of 20 mm. The catalyst was purged with hydrogen and nitrogen gas mixture (volume ratio 1:1) at 400°C for 0.5h, and the space velocity of the purge gas was 100mL / min.

[0021] After that, methyl benzoate was treated with 0.25h -1 Space Velocity Liquid Phase Feed. When the hydrogen ester molar ratio is 2.5, the hydrogen gas flow rate is 17.14 mL / min; when the nitrogen ester molar ratio is 0.1, the nitrogen gas flow rate is 0.69 mL / min. Under the conditions of temperature 430°C and pressure 0.4MPa, the reaction of hydrogenation to benzaldehyde is carried out. The conversion rate of methyl benzoate was 91.3%, and the selectivity of forming benzaldehyde was 95.5%.

Embodiment 2

[0023] 10 g of the catalyst was loaded into a tubular reactor with an inner diameter of 20 mm. The catalyst was purged with hydrogen and nitrogen gas mixture (volume ratio 1:1) at 400°C for 0.5h, and the space velocity of the purge gas was 100mL / min.

[0024] After that, methyl benzoate was treated with 0.25h -1 Space Velocity Liquid Phase Feed. When the hydrogen ester molar ratio is 2.5, the hydrogen gas flow rate is 17.14 mL / min; when the nitrogen ester molar ratio is 0.5, the nitrogen gas flow rate is 3.43 mL / min. Under the conditions of temperature 430°C and pressure 0.4MPa, the reaction of hydrogenation to benzaldehyde is carried out. The conversion rate of methyl benzoate was 92.50%, and the selectivity of forming benzaldehyde was 96.0%.

Embodiment 3

[0026] 10 g of the catalyst was loaded into a tubular reactor with an inner diameter of 20 mm. The catalyst was purged with hydrogen and nitrogen gas mixture (volume ratio 1:1) at 400°C for 0.5h, and the space velocity of the purge gas was 100mL / min.

[0027] After that, methyl benzoate was treated with 0.25h -1 Space Velocity Liquid Phase Feed. The hydrogen ester molar ratio is 2.5, the hydrogen gas flow rate is 17.14mL / min; the nitrogen ester molar ratio is 2.5, the nitrogen gas flow rate is 17.14mL / min. Under the conditions of temperature 430°C and pressure 0.4MPa, the reaction of hydrogenation to benzaldehyde is carried out. The conversion rate of methyl benzoate was 96.0%, and the selectivity of forming benzaldehyde was 98.1%.

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Abstract

The invention relates to a technological method for preparing benzaldehyde through methyl benzoate hydrogenation. Methyl benzoate and a catalyst are in contact to carry out hydrogenation reaction to generate benzaldehyde, and a dilutent is introduced during the reaction; and the diluent is selected from one or more of N2, Ar, He, CO2 and CH4. According to the technological method, the conversion rate and the selectivity of the methyl benzoate are improved, side reaction is obviously inhibited, and generation of byproducts is reduced; and therefore, the reaction can be retained in a high-conversion-rate and high-selectivity reaction process for a long time.

Description

technical field [0001] The invention belongs to the technical field of chemical engineering, in particular to a process for preparing benzaldehyde by hydrogenation of methyl benzoate. Background technique [0002] The catalytic hydrogenation of methyl benzoate to benzaldehyde is an extremely important reaction. The catalyst used in this reaction is mainly supported zinc oxide catalyst. Gas-phase hydrogenation of methyl benzoate, in addition to generating benzaldehyde, its main by-products are benzene, toluene, benzyl alcohol, benzyl methyl ether and benzylbenzene, etc., wherein benzene is the high-temperature decarbonylation decomposition product of benzaldehyde, toluene, Benzyl alcohol is the product of excessive hydrogenation of benzaldehyde, and benzyl methyl ether is the product of dehydration of methanol and benzyl alcohol on the surface of the catalyst. Because the relative volatility of benzyl methyl ether is very similar to that of benzaldehyde, it is very difficult...

Claims

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Application Information

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IPC IPC(8): C07C45/41C07C47/54
CPCC07C45/41C07C47/54
Inventor 姚志龙张岳娇郭庆明江雨城周明汤勇孙培永黄中伟张胜红
Owner 湖南中岭化工有限责任公司
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