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Refining process of o-nitrophenol

A technology of o-nitrophenol and technology, which is applied in the field of refining technology of o-nitrophenol, can solve the problems of high COD, high energy consumption, difficult treatment and recycling of wastewater, so as to save energy and equipment, reduce production costs, The effect of reducing the content of impurities

Active Publication Date: 2012-08-01
AZUREWAVE TEHNOLOGIES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. The content of o-nitrophenol is difficult to exceed 95%
[0004] 2. The o-nitroanisole in the recovery process is a mixture, which is difficult to handle and recycle
[0005] 3. The COD of the wastewater generated is high, reaching 4000mg / l, making it difficult to treat environmentally friendly water
[0006] 4. The process requires acid analysis-rectification operation to improve the purity, but the energy consumption is high

Method used

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Embodiment Construction

[0023] Below in conjunction with embodiment, the present invention is further described.

[0024] The refining process of o-nitrophenol comprises the steps:

[0025] ①. Pour the methyl ether oxidation reaction mother liquid water into the storage tank, and use the condenser to circulate and cool down, and the temperature drops below 30°C;

[0026] ②, let stand for 1 hour (the stratification is more obvious), pour the middle and upper layer water into the decolorization pot; the lower layer material can be returned to the oxidation system, and o-nitroanisole is recovered;

[0027] ③. Add 1% powdered activated carbon to the decolorization pot, heat up to 60°C, and decolorize for 1 hour;

[0028] 4. After the decolorization is qualified (indicators such as detection chroma), the decolorization liquid is filtered through a filter press, and the filter residue activated carbon is extracted with methanol to extract o-nitroanisole, and the activated carbon is recovered and reused; ...

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Abstract

The invention belongs to the technical field of chemical engineering and particularly relates to a refining process of o-nitrophenol. According to the refining process of the o-nitrophenol, 100kg of o-nitroanisole is excessively recovered from per 10 tons of waste water, and the production cost of the o-nitroanisole is reduced. Active carbon is added for absorption, the purity of the o-nitrophenol is improved, and the original content lower than 95 percent is improved to the content higher than 99 percent. The activated carbon regeneration is carried out, the o-nitroanisole is further extracted, activated carbon can be cyclically utilized, and meanwhile, the recovery rate of the o-nitroanisole is improved. In the original process, the purification can be carried out only through the rectification. According to the refining process provided by the invention, the purity of the o-nitrophenol can be improved through distillation, and energy sources and equipment are saved. The waste water chemical oxygen demand (COD) is reduced by a half through being compared with the results of the original process, impurities are absorbed by the active carbon, the content of the impurities is greatly reduced, and the waste water treatment by resin absorption is favorably realized.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a process for refining o-nitrophenol. Background technique [0002] The production process of o-nitrophenol is relatively mature at present, but there are some defects in various production processes. For example, when o-nitrophenol is produced by o-nitroanisole, the process defects mainly exist in: [0003] 1. The o-nitrophenol content is difficult to exceed 95%. [0004] 2. The o-nitroanisole in the recovery process is a mixture, which is difficult to handle and recycle. [0005] 3. The COD of the wastewater produced is high, reaching 4000mg / l, making it difficult to treat environmentally friendly water. [0006] 4. The process requires acid analysis-rectification operation to improve the purity, but the energy consumption is relatively high. Contents of the invention [0007] Aiming at the problems existing in the prior art, the present invention aim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C205/22C07C205/37C07C201/16C02F1/28
Inventor 解凤苗张其忠郝宗贤
Owner AZUREWAVE TEHNOLOGIES INC
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