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Process for producing para-amino-phenol

A p-aminophenol and production process technology, applied in the field of p-aminophenol production process, can solve the problems of mixing, difficult separation and recovery, etc., and achieve the effect of ensuring purity, high degree of automation, and simple operation process

Inactive Publication Date: 2002-11-06
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] The purpose of this invention is to provide a new process for the production of p-aminophenol by catalytic hydrogenation of p-nitrophenol, which can effectively separate and recover the catalyst in the reaction material, especially overcome the problem that the suspended catalyst is difficult to separate and recover, and avoid the catalyst Fine particles are mixed into p-aminophenol products to ensure the purity of PAP products

Method used

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  • Process for producing para-amino-phenol
  • Process for producing para-amino-phenol

Examples

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Embodiment Construction

[0010] Below in conjunction with accompanying drawing illustrate the embodiment of p-aminophenol production process of the present invention.

[0011] Weigh a certain amount of p-nitrophenol, ethanol, water and catalyst nickel according to the conventional ratio, and add them into the autoclave 4. First feed hydrogen at 3 atmospheres, close valve 2-1; open vent valve 2-2, remove hydrogen and air; repeat the above steps four times to replace the air in the kettle. Feed hydrogen into the reaction kettle 4, adjust the pressure reducing valve of the hydrogen cylinder, keep the pressure in the reaction kettle 4 at 16-20 atmospheres, open the speed regulating temperature controller 5, adjust the stirring speed, and keep the temperature in the kettle at Stir the reaction in the range of 95-100°C. When the flow meter P on the reactor 4 shows that the hydrogen flow rate is zero, it means that the reaction is complete. Open valve 2-2, and close this valve after exhausting excess hydro...

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Abstract

The production process with p-nitrophenol material includes catalytic hydrogenation with Ni, Al or other metal catalyst with the reactant material being pumped to circulate between reactor and inorganic memobrane assembly; repeated filtering of circular material through inorganic membrane with the liquid phase product passing through the membrane pores; the conventional treatment of the collectedliquid phase product to obtain p-aminophenol crystal product; and the recovery and reuse of the solid catalyst in circular flow and finally in the reactor. During the process, fine suspended catalystis separated and recovered continuously.

Description

(1) Technical field [0001] The invention relates to a production process for preparing p-aminophenol by catalytic hydrogenation reduction method of p-nitrophenol. (2) Background technology [0002] p-aminophenol, also known as p-hydroxyaniline, or PAP for short, is a colorless or pale yellow flaky or needle-like crystal. It turns brown when exposed to light or in the air, soluble in hot water and alcohol, slightly soluble in cold water, almost insoluble in benzene and chloroform. PAP is an organic chemical intermediate with a wide range of uses, mainly used in the fields of rubber industry, pharmaceutical industry, dye industry and photosensitive material industry. The countries that produce p-aminophenol in the world are mainly the United States, France, Britain, Japan and so on. In recent years, the demand for the production of paracetamol drugs using PAP as an intermediate in my country has also increased rapidly. [0003] At present, in addition to the nitrobenzene ca...

Claims

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Application Information

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IPC IPC(8): C07C209/36C07C215/76
Inventor 徐南平陈日志邢卫红
Owner NANJING UNIV OF TECH
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