Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A kind of method directly synthesizing cyclohexanone by hydrogenation of nitrobenzene

A technology for nitrobenzene and cyclohexanone, applied in the field of chemical technology, can solve the problems of complex process route, low cyclohexene efficiency and high production cost, and achieve the effects of simple synthesis process, mild reaction conditions and high yield

Active Publication Date: 2015-11-18
HEBEI UNIV OF TECH
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the process route is complex
In particular, the efficiency of partial hydrogenation of benzene to cyclohexene is not high, resulting in higher production costs

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
  • A kind of method directly synthesizing cyclohexanone by hydrogenation of nitrobenzene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In the autoclave, add nitrobenzene 0.49g successively, the Pd / MCM-41 (molecular sieve) catalyst 0.78g that loading capacity is mass percent 2%, AlCl 3 0.54g, cetyltrimethylammonium bromide 0.006g and water 10ml (the molar ratio is 1:0.037:1:0.004:139). Pass N 2 Make a replacement. Then the temperature was raised to 80°C, and then hydrogen gas was introduced to the reaction pressure of 1.3 MPa and maintained. After 1 hour of reaction, the hydrogen gas flow was stopped and the temperature was lowered to room temperature. The catalyst and the reaction solution were separated by filtration under reduced pressure, and the reaction solution was extracted and separated by toluene to obtain an organic phase, which was analyzed by gas chromatography. The yield of the product cyclohexanone was quantitatively calculated to be 56.7%.

Embodiment 2～5

[0035] The same operation steps and reaction conditions as in the process of synthesizing cyclohexanone in Example 1, the active metals of the catalyst were changed to Ru, Rh, Pt, Au respectively. The organic phase was analyzed by gas chromatography, and the yield of the product cyclohexanone was quantitatively calculated. The experimental results are shown in Table 1.

[0036] The impact of table 1 catalyst active metal on the synthetic cyclohexanone reaction

[0037] Example

Embodiment 6～10

[0039] The operating steps and reaction conditions of the synthetic cyclohexanone process in Example 1 are the same, and the carrier of the catalyst is changed to AC, γ-Al 2 o 3 , TS-1 (molecular sieve), HZSM-5 (molecular sieve), SBA-15 (molecular sieve), etc. The organic phase was analyzed by gas chromatography, and the yield of the product cyclohexanone was quantitatively calculated. The experimental results are shown in Table 2.

[0040] The impact of table 2 catalyst carrier on the synthetic cyclohexanone reaction

[0041] Example

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 discloses a method for directly synthesizing cyclohexanone from nitrobenzene by adopting a hydrogenation process. The method comprises the following steps: adding nitrobenzene, a catalyst, an aulixilary, a surfactant and a solvent into a high-pressure kettle, introducing N2 for replacement, heating to 30-150 DEG C, introducing hydrogen until the pressure is 0.1-5MPa and keeping the pressure, reacting for 0.1-4 hours, stopping introduction of hydrogen, cooling to room temperature, performing reduced pressure filtering separation on the catalyst and a reaction solution, and performing extraction separation on the reaction solution to obtain a cyclohexanone-containing organic phase. The method has the characteristics that raw material nitrobenzene is cheap and easily available, a synthetic process is easier and convenient, the reaction conditions are mild and the yield is high; the cyclohexanone yield is close to 60%.

Description

technical field [0001] The invention relates to a method for directly synthesizing cyclohexanone by hydrogenation of nitrobenzene, specifically a process for directly synthesizing cyclohexanone by hydrogenation of nitrobenzene with nitrobenzene as a raw material and catalyzed by a loaded metal catalyst. Chemical technology field. Background technique [0002] Cyclohexanone is the main intermediate for the preparation of caprolactam and adipic acid. It is also an important organic chemical raw material and industrial solvent. It is used in industries such as medicine, paint, coating, rubber and pesticides. In addition, it also has a great role in the recycling of printing and plastics. Dosage. [0003] At present, the industrial production process route of cyclohexanone in the world mainly contains three kinds according to the raw materials: cyclohexane liquid-phase oxidation method (U.Schuchardt, D.Cardoso, R.Sercheli, et al. and (H. Zhang, S.M. Mahajani, M.M. Sharma, et ...

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
Patent Type & Authority Patents(China)
IPC IPC(8): C07C49/403C07C45/00
CPCC07C45/00C07C2601/14C07C49/403
Inventor 王延吉赵茜王淑芳杨云芳任小亮赵新强
Owner HEBEI UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com