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
View PDF2 Cites 0 Cited by
  • 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 prod

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Technological method for preparing benzaldehyde through methyl benzoate hydrogenation
  • Technological method for preparing benzaldehyde through methyl benzoate hydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0019] Example 1

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

[0021] After that, methyl benzoate was -1 Space velocity liquid phase feed. The hydrogen ester molar ratio is 2.5, and the hydrogen gas flow rate is 17.14 mL / min; the nitrogen ester molar ratio is 0.1, and the nitrogen gas flow rate is 0.69 mL / min. The hydrogenation to benzaldehyde reaction was carried out under the conditions of temperature 430℃ and pressure 0.4MPa. The conversion of methyl benzoate was 91.3%, and the selectivity to benzaldehyde was 95.5%.

Example Embodiment

[0022] Example 2

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

[0024] After that, methyl benzoate was -1 Space velocity liquid phase feed. The hydrogen ester molar ratio is 2.5, and the hydrogen gas flow rate is 17.14 mL / min; the nitrogen ester molar ratio is 0.5, and the nitrogen gas flow rate is 3.43 mL / min. The hydrogenation to benzaldehyde reaction was carried out under the conditions of temperature 430℃ and pressure 0.4MPa. The conversion of methyl benzoate was 92.50%, and the selectivity to benzaldehyde was 96.0%.

Example Embodiment

[0025] Example 3

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

[0027] After that, methyl benzoate was -1 Space velocity liquid phase feed. The hydrogen ester molar ratio is 2.5, and the hydrogen gas flow rate is 17.14 mL / min; the nitrogen ester molar ratio is 2.5, and the nitrogen gas flow rate is 17.14 mL / min. The hydrogenation to benzaldehyde reaction was carried out under the conditions of temperature 430℃ and pressure 0.4MPa. The conversion of methyl benzoate was 96.0%, and the selectivity to benzaldehyde was 98.1%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap