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Novel technology for preparing ortho-aminophenol

A technology of o-aminophenol and o-nitrochlorobenzene, which is applied in the chemical industry, can solve the problems of low product yield, high cost of ethanol, and high cost, and achieve the effects of high conversion rate of finished products, expansion of production income, and improvement of productivity

Active Publication Date: 2014-05-21
JINAN SUBANG FINE CHEM
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Problems solved by technology

However, due to the high solubility of o-aminophenol (OAP) in organic solvents and its instability, the yield has not been high, and the cost of ethanol is also high, making the cost of this process slightly higher
And adopt sodium sulfide reduction, the yield of the product obtained is very low, and because contain a large amount of chloride ions in the waste water, also cause very big pollution to the environment

Method used

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  • Novel technology for preparing ortho-aminophenol

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Embodiment Construction

[0027] A novel process for preparing o-aminophenol is characterized in that: it specifically comprises the following steps:

[0028] 1. (1) Select a certain amount of o-nitrochlorobenzene as a raw material.

[0029] (2) Add o-nitrochlorobenzene into the sodium hydroxide solution and enter the hydrolysis kettle for hydrolysis. The hydrolysis temperature is 160~175°C

[0030] The reaction time is 4.5 hours, and the pressure is 0.68MP~0.72MP.

[0031] (3) Sodium o-nitrophenolate is obtained through hydrolysis in a hydrolysis kettle.

[0032] (4) Pour the obtained product into a reduction kettle and add sodium hydrosulfide for reduction to obtain sodium o-aminophenate. The reduction temperature is 60-80°C and the reduction time is 4-5 hours.

[0033] (5) Add sulfuric acid solution for acidification, so that the solution remains acidic, the pH value is controlled between 3 and 5, and sulfur element is precipitated.

[0034] (6) Filter.

[0035] (7) Add alkali to the filtered so...

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Abstract

The invention belongs to the technical field of a chemical industry, and particularly relates to a novel technology for preparing ortho-aminophenol. By adopting the novel technology for preparing the ortho-aminophenol disclosed by the invention, more 1.1-1.2 tons of elemental sulfur and 2 tons of sodium sulfate solid can be recovered from per 1 ton of ortho-aminophenol, a hydrogen sulfide gas can be obtained after acidification, sodium hydrosulfide is generated by virtue of an absorption tower to put into reproduction, 3-4% of solid waste can be obtained by using four-effect evaporation, and can be put into reproduction, the traditional technology can be used for purifying just by rectification, and the purity of the ortho-aminophenol can be improved by distillation firstly, so that the energy source and equipment are saved, the wastewater generated in the production process can be recycled, finally, wastewater is hardly generated, and impurities are also discharged and recycled in the process.

Description

technical field [0001] The invention relates to the technical field of chemical industry, and is a refined process of o-aminophenol. Background technique [0002] Ortho-aminophenol (OPA), a typical aromatic amphoteric compound, is an important chemical intermediate widely used in the fields of dyes, medicine, printing and biology. The main preparation process includes iron powder reduction, hydrogenation reduction, nitrification and reduction, and sodium sulfide reduction. The traditional synthesis method is to use o-nitrochlorobenzene as raw material, hydrolyze and reduce iron powder. The three wastes are seriously polluted during the reduction process, and the product is wrapped in iron sludge, which makes the product yield not high. Ortho-aminophenol can also be prepared by using o-nitrophenol as a raw material ethanol as a solvent. Because the solubility of o-nitrophenol (ONP) in water is too small during the reduction process, most of this process uses organic solven...

Claims

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Application Information

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IPC IPC(8): C07C215/76C07C213/00
Inventor 姚存良肖红军
Owner JINAN SUBANG FINE CHEM
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