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Preparation method of m-aminophenol

A technology of aminophenol and nitrophenol, which is applied in the field of m-aminophenol preparation and can solve problems such as equipment corrosion, non-continuous production, and environmental pollution

Inactive Publication Date: 2018-05-29
YANTAI ANOKY FINE CHEM CO LTD +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the existing m-aminophenol preparation method has severe reaction conditions, severe equipment corrosion, many wastes, serious environmental pollution, low catalyst recycling rate, inability to continuously produce, and low product purity or production capacity. , and a preparation method of m-aminophenol is provided

Method used

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  • Preparation method of m-aminophenol

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Effect test

Embodiment 1

[0096] A preparation method of m-aminophenol, using m-nitrophenol as raw material, adopting ReneyNi catalyst, carrying out continuous catalytic hydrogenation reaction in a reactor, after the catalyst is separated and recovered, the reducing solution is precipitated and purified to obtain the target product m-amino phenol.

[0097] Specific steps include:

[0098] (1) Put 5000kg of 50% methanol aqueous solution and 1250kg of m-nitrophenol into the chemical material tank, follow-up feeding is carried out according to this ratio, stir evenly, pump into the first-level hydrogenation reactor, add ReneyNi catalyst 125kg, catalyst The particle size is 10nm, pass through the nitrogen replacement system three times, then pass through the hydrogen replacement system three times, start stirring, raise the temperature to 90-100°C, and pump m-nitrophenol into the first-stage hydrogenation kettle at a flow rate of 6000L / h The raw material solution, into the H 2 , the hydrogen pressure in ...

Embodiment 2

[0102] (1) 5000kg of 50% methanol aqueous solution and 1250kg of m-nitrophenol are put into the chemical material tank, and the follow-up feeding is according to the ratio, stirred evenly, pumped into the primary hydrogenation reactor, and 125kg of ReneyNi catalyst is added. The particle size is 500 μm; pass through the nitrogen replacement system three times, then pass through the hydrogen replacement system three times, start stirring, raise the temperature to 80-90°C, and pump m-nitrophenol into the first-stage hydrogenation kettle at a flow rate of 5000L / h Raw material liquid, pass into H 2 , the hydrogen pressure in the control system is 3.0MPa, and 2.5kg of ReneyNi catalyst is added to the primary hydrogenation reactor every 3 hours. After the material in the primary hydrogenation reactor gradually increases, it flows into the secondary reactor through the overflow port. In the hydrogenation kettle, the material stays in the hydrogenation kettle for about 2-3 hours. Afte...

Embodiment 3

[0106] (1) Put 12500kg of 50% methanol aqueous solution and 1250kg of m-nitrophenol into the chemical material tank, and the subsequent feeding is stirred evenly according to the ratio, evenly stirred, pumped into the primary hydrogenation reactor, and 125kg of ReneyNi catalyst is added, The particle size of the catalyst is 10nm; pass through the nitrogen replacement system three times, then pass through the hydrogen replacement system three times, start stirring, raise the temperature to 90-100°C, and pump m-nitrogen into the first-stage hydrogenation tank at a flow rate of 6000L / h The raw material solution of phenol is passed into H 2 , the hydrogen pressure in the control system is 3.0MPa, and 2.5kg of ReneyNi catalyst is added to the primary hydrogenation reactor every 3 hours. After the material in the primary hydrogenation reactor gradually increases, it flows into the secondary reactor through the overflow port. In the hydrogenation kettle, the material stays in the hyd...

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Abstract

The invention discloses a preparation method of m-aminophenol. According to the preparation method, m-nitrophenol is subjected to continuous catalytic hydrogenation, and then subjected to settling andfilm filtering, so as to obtain the m-aminophenol. The preparation method is easy to operate and high in safety, can realize continuous production, and can achieve effects of high production efficiency, high product quality, low labor intensity, environmentally friendliness, high catalyst utilization rate and favorability for industrialization.

Description

technical field [0001] The invention relates to a preparation method of m-aminophenol. Background technique [0002] m-Aminophenol is an important dye intermediate, such as the intermediate of diazo dye and sulfur dye, used in the manufacture of sulfur dye, azo dye, fur dye and fluorescent whitening agent EB, etc. It is used for insecticide in the pesticide industry It is the raw material of the agent thionon, and it can also be used in the manufacture of medicines and plastic curing agents. As an important chemical intermediate, m-aminophenol was first produced by reducing nitrophenol with iron powder, but the iron powder reduction method caused serious environmental pollution. In the "Tenth Five-Year Plan" of the chemical industry, the "nitrophenol The production technology of m-aminophenol by "method" is included in the eliminated production process. In addition, other methods include fixed-bed intermittent catalytic hydrogenation of nitrophenol, hydrogenation of nitrob...

Claims

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Application Information

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IPC IPC(8): C07C213/02C07C213/10C07C215/76
CPCC07C213/02C07C213/10C07C215/76Y02P20/584
Inventor 杨勇刘云龙曲美君张永明戴杰
Owner YANTAI ANOKY FINE CHEM CO LTD
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