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Tech. of preparing amino benz methyl-phenoxide by nitro methyl-phenoxide mixture catalyzing hydrogenation

A technology for nitroanisole and aminoanisole is applied in the field of preparing aminoanisole by catalytic hydrogenation of nitroanisole mixture, and can solve the problem of large discharge of waste water and waste residue, increased treatment cost and hidden danger of secondary pollution And other issues

Inactive Publication Date: 2006-11-15
CHANGZHOU JIASEN CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation of 2-aminoanisole and 4-aminoanisole usually takes 2-nitroanisole and 4-nitroanisole as raw materials respectively, and it is prepared through sodium sulfide reduction or iron powder reduction. The process has the following disadvantages: high consumption, high cost, low quality, especially the large discharge of waste water and waste residue, causing serious environmental pollution
If the waste water and waste residue produced are treated, the treatment cost will be increased, and there is also a hidden danger of secondary pollution

Method used

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  • Tech. of preparing amino benz methyl-phenoxide by nitro methyl-phenoxide mixture catalyzing hydrogenation
  • Tech. of preparing amino benz methyl-phenoxide by nitro methyl-phenoxide mixture catalyzing hydrogenation

Examples

Experimental program
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Effect test

Embodiment 1

[0023] A process for preparing aminoanisole by catalytic hydrogenation of 2-nitroanisole, the process steps are as follows:

[0024] 1. Using methanol as a solvent, add 2-nitroanisole into a three-phase fixed-bed catalytic reactor with Raney-Ni as a catalyst. The amount of catalyst is 1.0% of the nitro compound, and the catalyst particles are 0.9 mm. Hydrogen is introduced into hydrogen to undergo a catalytic hydrogenation reduction reaction, and the hydrogen is prepared by methanol catalytic hydrogen production technology. During the reaction, the control temperature is 120 ° C, and the operating pressure is 4.0 MPa;

[0025] 2. After the catalytic hydrogenation reduction reaction is completed (the standard is to no longer consume hydrogen), solid-liquid separation is carried out after cooling and pressure relief, and the reaction material is transported to the catalyst recovery device, the blade filter device and the corresponding filter system to recover the catalyst. The c...

Embodiment 2

[0030] A process for preparing aminoanisole by catalytic hydrogenation of 4-nitroanisole, the process steps are as follows:

[0031] 1. Using methanol as the solvent, add 4-nitroanisole into the three-phase fluidized bed catalytic reactor with Raney-Ni as the catalyst, the amount of the catalyst is 4.5% of the nitro compound, the catalyst particle is 1.0mm, Catalytic hydrogenation reduction reaction occurs by feeding hydrogen, the control temperature during the reaction is 160°C, and the operating pressure is 6.0MPa;

[0032] 2. After the catalytic hydrogenation reduction reaction is completed (the standard is to no longer consume hydrogen), solid-liquid separation is carried out after cooling and pressure relief, and the reaction material is transported to the catalyst recovery device, the blade filter device and the corresponding filter system to recover the catalyst. The catalyst can be recycled, and the material removed from the catalyst enters the next step;

[0033] 3. ...

Embodiment 3

[0037] A process for preparing aminoanisole by catalytic hydrogenation of a mixture of 2-nitroanisole and 4-nitroanisole, the process steps are as follows:

[0038] (1) Take methanol as solvent, add 2-nitroanisole and 4-nitroanisole into the three-phase fixed-bed catalytic reactor using Raney-Ni as catalyst, the catalyst particle is 10.0mm, and then feed hydrogen Catalytic hydrogenation reduction reaction occurs, the control temperature during the reaction is 130°C, and the operating pressure is 4.8Mpa;

[0039] (2) After the catalytic hydrogenation reduction reaction is completed (with no more consumption of hydrogen as the standard), solid-liquid separation is carried out after cooling and pressure relief, and the reaction material is transported to the catalyst recovery device blade filter device and the corresponding filter system to recover the catalyst, The recovered catalyst can be recycled, and the material removed from the catalyst goes to the next step;

[0040] (3)...

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Abstract

A process for preparing amino phenylmether from nitro phenylmether mixture by catalytic hydrogenating includes such steps as catalytic hydroreducing reaction between methanol, nitro phenylmether mixture and catalyst, recovering catalyst, decoloring, removing impurities, filtering to obtain liquid phase (the solution of amino phenylmether, methanol and water), separation and refining.

Description

Technical field [0001] The invention relates to a process for preparing aminoanisole by catalytic hydrogenation of a nitroanisole mixture, and belongs to the technical field of fine chemicals. Background technique [0002] Aminoanisole (mainly 2-aminoanisole and 4-aminoanisole) is an important organic synthesis intermediate. At present, the preparation of 2-aminoanisole and 4-aminoanisole is usually made from 2-nitrobenzene and 4-nitrobenzene respectively, through sodium sulfide reduction or iron powder reduction. The process has the following shortcomings: high consumption, high cost, low quality, especially large discharge of waste water and waste residue, causing serious environmental pollution. If the waste water and waste residue generated are treated, this will increase the cost of treatment, and there will also be hidden dangers of secondary pollution. Contents of the invention [0003] The object of the present invention is to provide a process for preparing amin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C213/02C07C217/82
Inventor 许文林段玉辉刘学谦
Owner CHANGZHOU JIASEN CHEM
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