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

A kind of method for preparing o-chlorobenzaldehyde by continuous oxidation of o-chlorotoluene

A technology of o-chlorotoluene and an oxidizing agent, which is applied in the technical field of organic synthesis technology, can solve the problems of inapplicability for large-scale promotion, large amount of catalyst, high production cost, etc., and achieves avoiding the use of co-catalyst, short reaction time and high production efficiency. high effect

Active Publication Date: 2020-11-06
CHANGZHOU UNIV
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process route is simple, but the production cost is expensive, and it is not suitable for large-scale promotion at present
[0019] The above method is optimized and improved from different angles to the preparation of o-chlorobenzaldehyde by the oxidation of o-chlorotoluene, but there are still some problems to be solved: firstly still mainly adopt the batch production of batch still in large-scale production; secondly in the above-mentioned method There are still too many catalysts used in the process, too much waste water produced by hydrolysis, too deep chlorination depth, increased side reactions, low selectivity of the target product, and low yield. The continuous oxidation of toluene to synthesize o-chlorobenzaldehyde can solve many deficiencies of the existing technology in many aspects

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 for preparing o-chlorobenzaldehyde by continuous oxidation of o-chlorotoluene
  • A kind of method for preparing o-chlorobenzaldehyde by continuous oxidation of o-chlorotoluene
  • A kind of method for preparing o-chlorobenzaldehyde by continuous oxidation of o-chlorotoluene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] (1) Device: refer to figure 2 Determine the connection mode of the tubular reactor, the pipeline type is: (3a+3b) direct flow channel + round cake pulse variable diameter rectangular flat pipeline, the inner diameter and volume of the pipeline are determined according to the flow rate and reaction residence time, and the heat exchange medium is heat conduction Oil.

[0045] (2) 3.03g cobalt acetate and 3.03g sodium molybdate were dissolved in 200ml o-chlorotoluene and 200ml acetic acid respectively to form a mixed solution. At this time, n (cobalt acetate):n (o-chlorotoluene)=0.0075:1, and 3.03g NaBr dissolved in 5% H 2 o 2 form H 2 o 2 -Acetic acid solution, at this moment n (sodium bromide):n (o-chlorotoluene)=0.0075:1, o-chlorotoluene-acetic acid solution and H 2 o 2 -Acetic acid solution is injected in the tubular reactor of continuous heat exchange by the flow velocity of 8.33ml / min and 16.67ml / min respectively, at this moment n(H 2 o 2 ): n (o-chlorotolue...

Embodiment 2

[0047] (1) Device: refer to figure 2 Determine the connection mode of the tubular reactor. The pipeline type is: (3a+3c) direct flow channel + oblique square cake pulse variable diameter rectangular flat pipeline. The inner diameter and volume of the pipeline are determined according to the flow rate and reaction residence time. The heat exchange medium is heat transfer oil.

[0048] (2) Dissolve 6.06g cobalt acetate and 6.06g sodium molybdate in 200ml o-chlorotoluene and 200ml acetic acid respectively to form a mixed solution. At this time, n (cobalt acetate): n (o-chlorotoluene)=0.015:1, and 6.06g NaBr dissolved in 15% H 2 o 2 form H 2 o 2 -Acetic acid solution, at this time n (sodium bromide):n (o-chlorotoluene)=0.015:1, o-chlorotoluene-acetic acid solution and H 2 o 2 -Acetic acid solution is injected in the tubular reactor of continuous heat exchange by the flow velocity of 8.33ml / min and 16.67ml / min respectively, at this moment n(H 2 o 2 ): n (o-chlorotoluene)=2...

Embodiment 3

[0050] (1) Device: refer to figure 2 Determine the connection mode of the tubular reactor. The pipeline type is: (3a+3d) direct flow channel + enhanced mixed round cake type rectangular flat pipeline. The inner diameter and volume of the pipeline are determined according to the flow rate and reaction residence time, and the heat transfer medium is heat transfer oil. .

[0051] (2) Dissolve 6.06g cobalt acetate and 6.06g sodium molybdate in 200ml o-chlorotoluene and 200ml acetic acid respectively to form a mixed solution. At this time, n (cobalt acetate): n (o-chlorotoluene)=0.015:1, and 6.06g NaBr dissolved in 15% H 2 o 2 form H 2 o 2 -Acetic acid solution, at this time n (sodium bromide):n (o-chlorotoluene)=0.015:1, o-chlorotoluene-acetic acid solution and H 2 o 2 -Acetic acid solution is injected in the tubular reactor of continuous heat exchange by the flow velocity of 8.33ml / min and 16.67ml / min respectively, at this moment n(H 2 o 2 ): n (o-chlorotoluene)=2:1, usi...

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 preparing o-chlorobenzaldehyde by continuously oxidizing o-chlorotoluene and belongs to the technical field of an organic synthesis technology. The method is a process technology which takes an o-chlorotoluene compound as a raw material, one or more metal ion complexes of cobalt, molybdenum and bromine as a catalyst, hydrogen peroxide as an oxidant and acetic acid as a solvent, and is used for preparing o-chlorobenzaldehyde by continuously oxidizing o-chlorotoluene in a tubular reactor. The method disclosed by the invention has the advantages of moderate conditions, short reaction time and high raw material utilization rate; effective control in a reaction process can be realized; the method is safe and stable, is continuously operated and has high production efficiency.

Description

technical field [0001] The invention belongs to the technical field of organic synthesis technology, and relates to a method for preparing o-chlorobenzaldehyde by continuous oxidation of o-chlorotoluene under liquid phase reaction conditions, more specifically using o-chlorotoluene as a substrate, hydrogen peroxide as an oxidant, cobalt, One or several metal ion complexes of molybdenum and bromine are used as catalysts, and monocarboxylic acid is used as solvent, and o-chlorobenzaldehyde products are continuously prepared in tubular reactors with different microstructures. Background technique [0002] O-chlorobenzaldehyde, also known as 2-chlorobenzaldehyde, is an important raw material in fine chemicals and an important intermediate in organic synthesis. Widely used in pesticides, pharmaceuticals, dyes and other industries. In the pesticide industry, it is used to produce high-efficiency and low-toxicity acaricide Mite Killer, which is in great demand in China; in the pha...

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): C07C45/28C07C47/55B01J19/24B01J19/00
CPCB01J19/0006B01J19/0013B01J19/2415C07C45/28C07C47/55
Inventor 刘建武蒋晗张跃严生虎沈介发马晓明陈代祥辜顺林张勇超
Owner CHANGZHOU UNIV
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