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Method for preparation of (substituted radical containted) aminophenol by catalytic hydrogenation of (substituted radical containted) nitrophenol

A technology of nitrophenol and aminophenol, which is applied in the field of catalysts and catalytic reactions for the synthesis of aminophenol by hydrogenation of nitrophenol, and can solve problems such as poor product quality, environmental pollution, precious metal catalysts and difficulty in catalyst recovery

Active Publication Date: 2007-09-26
SHANGHAI HUAYI NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of (containing substituent) nitrophenol hydrogenation preparation (containing substituent) efficient catalyst and catalytic hydrogenation method of aminophenol, this catalyst is Ni-A / X two-component loading type Catalyst, used for (containing substituent) nitrophenol hydrogenation to prepare (substituent) aminophenol reaction activity and selectivity are high, and reaction condition is gentle, has overcome effectively simultaneously as aforementioned patent CN1562959 adopts iron powder reduction method The disadvantages such as serious environmental pollution and poor product quality have been caused, and the problems of USP3654365, CN1167108 and CN1377875 patents using expensive noble metal catalysts and catalyst recovery difficulties have been solved, and the disadvantages of CN1061808 patent using electrolytic reduction process such as high energy consumption have been avoided. Provides a new method for the preparation of (substituent-containing) aminophenols

Method used

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  • Method for preparation of (substituted radical containted) aminophenol by catalytic hydrogenation of (substituted radical containted) nitrophenol
  • Method for preparation of (substituted radical containted) aminophenol by catalytic hydrogenation of (substituted radical containted) nitrophenol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～19

[0013] Catalyst preparation:

[0014] Preparation of catalyst by mixing method Add a certain concentration of nickel nitrate aqueous solution and the soluble salt solution of component A or the oxide of component A to the catalyst carrier according to a certain metering ratio, mix evenly and extrude or tablet, and then heat at 120°C drying at 600°C for 4 hours. After the roasting is completed, it is lowered to room temperature, put into the reactor, and reduced with hydrogen at 450°C for 4 hours. After the reduction is completed, the conditions are adjusted to the conditions required for the reaction. The composition of catalyst in each embodiment, the kind of starting material of component A is shown in Table 1.

[0015]

Example

Component A

Component A

starting material

Carrier X

The mass of Ni

Min content, %

The quality of A

Min content, %

Example 1

co

cobalt nitrate

γ-Al 2 o ...

Embodiment 20～28

[0024] 100 g of the catalyst in Example 15 was loaded into a fixed-bed tubular reactor, and reduced with hydrogen at 450° C. for 4 hours. After the reduction, the temperature was lowered to the reaction temperature. The p-nitrophenol with a mass fraction of 6% and hydrogen are mixed and preheated and then enter the reactor for reaction. The specific reaction conditions and reaction results in Examples 20-28 are shown in Table 5.

[0025]

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PUM

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Abstract

The invention discloses a making method of aminophenol with substituted group through hydrogenating nitrophenol with substituted group, which adopts Ni-A / X typed loaded catalyst, wherein A is one of Co, Mn, Cu, Cr, Mo, Ca, Zn, Fe and W; the carrier X is one of their composition of zeolite molecular sieve, Al2O3, SiO2, TiO2, MgO, active charcoal or amorphic aluminium silicate; the mass percentage of Ni in the catalyst is 2-45% and the mass percentage of component A is 1-40%.

Description

technical field [0001] The present invention relates to a kind of method that (containing substituent) nitrophenol catalytic hydrogenation prepares (containing substituent) aminophenol, specifically, the present invention provides a kind of (containing substituent) nitrophenol Catalyst for hydrogenation synthesis (substituent-containing) aminophenol and its catalytic reaction method. Background technique [0002] Aminophenol and substituted aminophenol compounds have a wide range of industrial applications and are an important class of chemical products or intermediates that can be used in many fields such as dyes, rubber, medicine, pesticides, and textiles. For example, p-aminophenol, o-aminophenol, and m-aminophenol can be used to synthesize various fine chemicals and intermediates such as medicine, dyes, photosensitive materials, hair dyes, oil antioxidants, rubber additives, etc., 2-methyl-5 -Aminophenol can be used as an intermediate in hair dyes, 2-ethoxy-4-aminopheno...

Claims

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Application Information

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IPC IPC(8): C07C215/76C07C213/02B01J23/755B01J23/889B01J23/88B01J29/072
CPCY02P20/50
Inventor 宁春利张猛张春雷邵敬铭
Owner SHANGHAI HUAYI NEW MATERIAL
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