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

A method for the selective reduction of aromatic nitro compounds to prepare aromatic amines when iron oxide/Fe(ii) coexists

An aromatic nitro, iron oxide technology, applied in the preparation of amino compounds, chemical instruments and methods, preparation of organic compounds, etc., can solve the problems of reducing production costs, environmental pollution, etc., and achieves cost reduction, high reduction selectivity, and reaction mild conditions

Active Publication Date: 2017-06-06
HEBEI CAIKE CHEM CO LTD
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing aromatic amines using iron oxide as a catalyst and ferrous iron as a reducing agent. This method reduces the production cost and solves the problem of environmental pollution caused by iron sludge produced by the reduction of iron powder

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 method for the selective reduction of aromatic nitro compounds to prepare aromatic amines when iron oxide/Fe(ii) coexists
  • A method for the selective reduction of aromatic nitro compounds to prepare aromatic amines when iron oxide/Fe(ii) coexists
  • A method for the selective reduction of aromatic nitro compounds to prepare aromatic amines when iron oxide/Fe(ii) coexists

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] The present invention relates to a method for reducing aromatic nitro groups to aromatic amino groups as shown below,

[0012] Aryl-NO 2 →Aryl-NH 2

[0013] Among them, Aryl is an aromatic group, and the method uses iron oxide as a catalyst and divalent iron as a reducing agent.

[0014] More specifically, in the aforementioned method, wherein the aromatic group is C 6 -C 10 Aryl.

[0015] More specifically, in the aforementioned method, wherein the aromatic group is selected from phenyl or naphthyl.

[0016] More specifically, in the foregoing method, wherein the aromatic group is optionally selected by one or more R groups independently selected from electron withdrawing groups or electron donating groups 1 Group substituted.

[0017] More specifically, in the aforementioned method, wherein the R 1 Selected from C 1-6 Alkyl, C 1-6 Alkoxy, cyano, hydroxyl, halogen, -SO 3 H, -COOH (list a series of groups).

[0018] The present invention also relates to a method for preparing 4,4'-...

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

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for preparing aromatic amines by reducing aromatic nitro compounds with divalent iron using iron oxide as a catalyst. The present invention provides a new process for the catalytic reduction of nitro compounds to prepare aromatic amine compounds with mild reaction conditions, simple equipment, high product yield, stable quality, and low environmental pollution, and can realize large-scale production.

Description

Technical field [0001] The invention relates to a method for liquid-phase reduction of aromatic nitro compounds. Specifically, the present invention relates to a method for reducing aromatic nitro compounds with divalent iron using iron oxide as a catalyst. More specifically, the present invention relates to the selective reduction of 4,4'-dinitrostilbene-2,2' -Method for preparing 4,4'-diaminostilbene-2,2'-disulfonic acid from disulfonic acid. Background technique [0002] Catalytic reduction of aromatic nitro compounds to prepare aromatic amines is a very important unit reaction in the dye, medicine and perfume industries. Commonly used are catalytic hydrogenation, iron powder reduction, and alkali sulfide reduction. Catalytic hydrogenation is a clean reduction method, but first requires a hydrogen source, which needs to be reacted in a closed high-pressure system, which requires high safety precautions and high investment in equipment. It is often used in the production of l...

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): C07C309/46C07C303/22C07C211/47C07C209/36
Inventor 魏雨张国福段卫东戈弋王红强张中领
Owner HEBEI CAIKE CHEM CO LTD
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