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Preparation method of p-aminophenol

A technology for p-aminophenol and p-nitrophenol is applied in the field of preparation of p-aminophenol, and can solve the problems of uncontinuous production, environmental pollution, and many three wastes.

Inactive Publication Date: 2018-06-22
YANTAI ANOKY FINE CHEM CO LTD +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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

Method used

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  • Preparation method of p-aminophenol

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Experimental program
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Effect test

Embodiment 1

[0096] A preparation method of p-aminophenol, using p-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 p-aminophenol phenol.

[0097] Specific steps include:

[0098] (1) Put 5000kg of 50% methanol aqueous solution and 1250kg of p-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 p-nitrophenol into the primary hydrogenation kettle at a flow rate of 6000L / h The raw material solution, into the H 2 , the hydrogen pressure ...

Embodiment 2

[0102] (1) 5000kg of 50% methanol aqueous solution and 1250kg of p-nitrophenol are put into the chemical material tank, and the follow-up feeding is according to the ratio, stirred evenly, pumped into the first-level hydrogenation reactor, and 125kg of ReneyNi catalyst is added, the catalyst The particle size is 500μm; 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 p-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...

Embodiment 3

[0106] (1) Put 12500kg of 50% methanol aqueous solution and 1250kg of p-nitrophenol into the chemical material tank, and then stir the subsequent feeding according to the ratio, stir evenly, pump it into the first-level hydrogenation reactor, and add 125kg of ReneyNi catalyst, 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 p-nitrogen into the first-stage hydrogenation kettle 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 hydrogenatio...

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Abstract

The invention discloses a preparation method of p-aminophenol. The p-aminophenol is prepared by carrying out continuous catalytic hydrogenation on p-nitrophenol and then carrying out sediment and membrane filtration. The method has the advantages of simple operation, high safety and capability of realizing continuous production; the effects of high production efficiency, high quality of a product,low labor intensity, environment friendliness, high utilization rate of a catalyst, and facilitation for industrialization are achieved.

Description

technical field [0001] The invention relates to a preparation method of p-aminophenol. Background technique [0002] p-Aminophenol is an important dye intermediate, such as the intermediate of diazo dyes and sulfur dyes, used to manufacture sulfur dyes, azo dyes, fur dyes 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, p-aminophenol was first produced by reducing o-nitrophenol with iron powder, but the reduction method of iron powder caused serious environmental pollution. Powder reduction method to produce p-aminophenol technology" was included in the list of eliminated production processes. In addition, other methods include fixed-bed intermittent catalytic hydrogenation of o-nitrophenol, hydrogenation of nitrobenzene, electrolytic reduction of nitrobenzene, etc...

Claims

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Application Information

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IPC IPC(8): C07C213/02C07C213/10C07C215/76
CPCC07C213/02C07C213/10C07C215/76
Inventor 刘云龙曲美君戴杰张永明杨勇
Owner YANTAI ANOKY FINE CHEM CO LTD
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