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Preparation method of p-aminophenol

A technology for p-aminophenol and a reaction kettle, which is applied in the field of preparation of p-aminophenol, can solve the problems of complex components and complicated preparation processes, and achieves the effects of convenient and simple preparation, simple components and low price.

Inactive Publication Date: 2014-09-17
ANHUI HUARUN PAINTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main method of producing p-aminophenol in industry is to hydrolyze p-nitrochlorobenzene into sodium p-nitrophenolate in sodium hydroxide, and then reduce it with iron powder after acidification. The traditional p-aminophenol has complex components and complicated preparation process

Method used

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  • Preparation method of p-aminophenol
  • Preparation method of p-aminophenol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A p-aminophenol consisting of raw materials by weight of,

[0027]

[0028] A preparation method for p-aminophenol, comprising the following processing steps,

[0029] (1) Activation reaction

[0030] 1. Weigh 299.5 grams of ethanol and 60 grams of distilled water into the autoclave;

[0031] 2. Weigh 3 grams of nickel and put it into a high-pressure reactor;

[0032] 3. Replace the air in the reactor with 0.3MP nitrogen for 3 times, and then replace the nitrogen in the high-pressure reactor with 0.3MP hydrogen for 3 times;

[0033] 4. Pressurize the hydrogen in the reactor to 1.1MP, start stirring and heating, and stop heating when the temperature rises to 85°C. When the temperature reaches 100°C, turn on the cooling water and keep the temperature in the kettle at 100-101°C for 40 minutes.

[0034] 5. Start to lower the temperature, and discharge hydrogen when the temperature is 75°C.

[0035] (2) Hydrogenation reaction

[0036] 1. Weigh 60 grams of sodium p-n...

Embodiment 2

[0043] A p-aminophenol consisting of raw materials by weight of,

[0044]

[0045] A preparation method for p-aminophenol, comprising the following processing steps,

[0046] (1) Activation reaction

[0047] 1. Weigh 300.5 grams of ethanol and 80 grams of distilled water into the autoclave;

[0048] 2. Weigh 3-4 grams of nickel and put it into a high-pressure reactor;

[0049] 3. Replace the air in the autoclave with 0.3MP nitrogen for 3 times, and then replace the nitrogen in the autoclave with 0.3MP hydrogen for 3 times;

[0050] 4. Pressurize the hydrogen in the autoclave to 1.1MP, start stirring and heating, and stop heating when the temperature rises to 85°C. When the temperature reaches 100°C, turn on the cooling water and keep the temperature in the autoclave at 100-101°C for 40 minutes.

[0051] 5. Start to lower the temperature, and discharge hydrogen when the temperature is 75°C.

[0052] (2) Hydrogenation reaction

[0053] 1. Weigh 80 grams of sodium p-nitr...

Embodiment 3

[0060] A p-aminophenol consisting of raw materials by weight of,

[0061]

[0062] A preparation method for p-aminophenol, comprising the following processing steps,

[0063] (1) Activation reaction

[0064] 1. Weigh 300 grams of ethanol and 70 grams of distilled water into the autoclave;

[0065] 2. Weigh 3.5 grams of nickel and put it into the autoclave;

[0066] 3. Replace the air in the autoclave with 0.3MP nitrogen for 3 times, and then replace the nitrogen in the autoclave with 0.3MP hydrogen for 3 times;

[0067] 4. Pressurize the hydrogen in the autoclave to 1.1MP, start stirring and heating, and stop heating when the temperature rises to 85°C. When the temperature reaches 100°C, turn on the cooling water and keep the temperature in the autoclave at 100-101°C for 40 minutes.

[0068] 5. Start to cool down, and discharge hydrogen when the temperature is 75°C.

[0069] (2) Hydrogenation reaction

[0070] 1. Weigh 70 grams of sodium p-nitrophenolate, put it into ...

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Abstract

A preparation method of p-aminophenol relates to the technical field of the chemical industry, and p-aminophenol comprises 586.5-588.5g of ethanol, 150-190g of distilled water, 3-4g of a catalyst, and 60-80g of p-nitrophenol sodium salt. P-aminophenol is prepared through an activation reaction and a hydrogenation reaction. The method has the advantages of simple component, low price, convenient and simple preparation, and convenient operation, and the prepared p-aminophenol has the advantages of good use effect, safety and reliability.

Description

technical field [0001] The invention relates to the technical field of chemical engineering, in particular to a preparation method of p-aminophenol. Background technique [0002] P-aminophenol is mainly used in the manufacture of paracetamol, an antipyretic and analgesic drug. Manufacture of sulfur dyes sulfur new blue FBL, sulfur blue CV, sulfur brilliant green GB, sulfur red brown B3R, sulfur reduction black CLG, sulfur dark blue 3R, fur dye fur brown P, etc. Used in the synthesis of polymer material stabilizers such as 4-hydroxydiphenylamine, N,N'-diphenyl-1,4-phenylenediamine, N-(4-hydroxyphenyl)-2-naphthylamine, etc. It can also produce photographic developer N-methyl-p-aminophenol, etc. The main method of producing p-aminophenol in industry is to hydrolyze p-nitrochlorobenzene into sodium p-nitrophenolate in sodium hydroxide, and then reduce it with iron powder after acidification. The traditional p-aminophenol has complex components and complicated preparation proce...

Claims

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Application Information

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IPC IPC(8): C07C215/76C07C213/02
Inventor 张学永陆建新靳民张广生
Owner ANHUI HUARUN PAINTS
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