Method for recovering ortho-aminophenol in concentrated brine

A technology for o-aminophenol, recovery and treatment, applied in the field of o-aminophenol recovery and treatment in concentrated brine, can solve the problems of economy, difficult operation, complicated process, etc. , avoid environmental pollution, improve the effect of economic benefits

Inactive Publication Date: 2018-11-13
XIAN LANSHEN NEW MATERIAL TECHNOLOGY CO LTD
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] O-aminophenol is 2-aminophenol, which is an important pharmaceutical and fine chemical intermediate, and its chemical formula is C 6 h 4 (OH)NH 2 , white or light gray crystalline powder, which turns brown or black when stored for a long time, widely used in the manufacture of sulfur dyes, azo dyes, fur dyes and fluorescent whitening agents, as well as medicines, plastic curing agents, etc., with the pharmaceutical and printing and dyeing industries With the rapid development of the rapid development, the market demand for o-aminophenol, a chemical intermediate, continues to rise, and its price rises immediately. However, the current large-scale production process of o-aminophenol in China is mainly based on catalytic hydrogenation. Wastewater has high salt content, large water volume, high concentration of organic matter, difficult to biochemical and has certain toxicity, which not only causes the discharge burden of production enterprises, but also causes economic losses for enterprises because the o-aminophenol contained in production wastewater cannot be recycled. Therefore, The wastewater treatment is imminent
[0003] At present, the most widely used method for the treatment of o-aminophenol wastewater is activated carbon decolorization combined with Fenton oxidation, but there is a large amount of sludge that becomes hazardous waste, and o-aminophenol cannot be recycled, causing economic losses. In recent years, resins have been used in o-aminophenol wastewater The application case of treatment, the publication number is CN 107129078 A [o-aminophenol wastewater treatment and resource recovery method], the process combines resin adsorption, micro-electrolysis and Fenton oxidation. The process is relatively complicated and the operation It is difficult, and a large amount of corrosive liquids such as acid and alkali are used during the period, and the processing cost is relatively high

Method used

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  • Method for recovering ortho-aminophenol in concentrated brine
  • Method for recovering ortho-aminophenol in concentrated brine
  • Method for recovering ortho-aminophenol in concentrated brine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The o-aminophenol production wastewater of a fine chemical plant is black with a small amount of suspended solids. CODcr: 9850mg / L, o-aminophenol: 4500mg / L, chloride ion content: 28000mg / L, pH: 7.98, inorganic salt content 6.1%.

[0045] The implementation steps are as follows:

[0046] 1.1. The o-aminophenol production wastewater is preliminarily filtered with fiber balls to remove suspended solids, and the pH of the filtrate is adjusted to 2 with concentrated sulfuric acid.

[0047] 1.2. Put 40ml LS-109D resin into a resin column (Φ25ⅹ300mm) fixed with iron clamps, and pass the water sample treated in 1.1 through the resin bed at a flow rate of 1BV / h at room temperature. When the column is adsorbed by 30BV , The CODcr of the adsorbed effluent drops below 300mg / L, o-aminophenol is not detected, and the effluent is colorless and transparent.

[0048] 1.3. 2.5BV methanol is used for resin desorption at a flow rate of 0.5BV / h. After the desorbed resin is washed with water at 15°C...

Embodiment 2

[0051] An environmental protection company provided o-aminophenol production wastewater with black color, clear water, CODcr: 10520mg / L, o-aminophenol: 4620mg / L, chloride ion content: 26800mg / L, pH: 7.56, inorganic salt content 6.5%.

[0052] The implementation steps are as follows:

[0053] 1.1. Adjust the pH of o-aminophenol production wastewater to 2 with concentrated sulfuric acid.

[0054] 1.2. Put 40ml LS-109D resin into a resin column (Φ25ⅹ300mm) fixed with iron clamps, and pass the water sample treated in 1.1 through the resin bed at a flow rate of 1BV / h at room temperature. When the column is adsorbed by 32BV , The CODcr of the adsorbed effluent drops below 300mg / L, o-aminophenol is not detected, and the effluent is colorless and transparent.

[0055] 1.3. 3BV methanol performs resin desorption at a flow rate of 0.5BV / h. After the desorbed resin is washed with water at 25°C, it is washed with water until the methanol content is less than 5%, and the resin can be reused after ...

Embodiment 3

[0058] A dye intermediate chemical company provided o-aminophenol production wastewater in black, slightly turbid water quality, CODcr: 9650mg / L, o-aminophenol: 4475mg / L, chloride ion content: 30800mg / L, pH: 8.0, and inorganic salt content 7.5% .

[0059] The implementation steps are as follows:

[0060] 1.1. The o-aminophenol production wastewater is preliminarily filtered with fiber balls to remove suspended solids, and the filtrate is adjusted to pH 2 with concentrated sulfuric acid.

[0061] 1.2. Put 40ml LS-109D resin into a resin column (Φ25ⅹ300mm) fixed with iron clamps, and pass the water sample treated in 1.1 through the resin bed at a flow rate of 1BV / h at room temperature. When the column is adsorbed by 30BV , The CODcr of the adsorbed effluent drops below 300mg / L, o-aminophenol is not detected, and the effluent is colorless and transparent.

[0062] 1.3. 3BV methanol performs resin desorption at a flow rate of 0.5BV / h. After the desorbed resin is washed with water at 30°C...

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Abstract

The invention discloses a method for recovering ortho-aminophenol in concentrated brine. The method includes adjusting the pH value of high-concentration ortho-aminophenol production wastewater in theconcentrated brine, then introducing into a macroporous styrene series adsorption resin to adsorb the ortho-aminophenol to the macroporous styrene series adsorption resin, utilizing an organic solvent to conduct elution on the saturated macroporous styrene series adsorption resin, and finally recovering the ortho-aminophenol from a solvent desorption solution. According to the method, the problemthat the enterprise water treatment is not up to standard is effectively solved, the economic benefit is improved to the greatest extent, and unification of wastewater treatment and resource recycling is achieved.

Description

Technical field [0001] The invention belongs to the technical field of wastewater treatment and utilization in the pharmaceutical and dye intermediate industries, and specifically relates to a method for recycling o-aminophenol in concentrated brine. Background technique [0002] O-aminophenol is 2-aminophenol, which is an important pharmaceutical and fine chemical intermediate, and its chemical formula is C 6 H 4 (OH)NH 2 , White or light gray crystalline powder, which turns into brown or black when left for a long time. It is widely used in the manufacture of sulfur dyes, azo dyes, fur dyes and fluorescent brighteners, as well as medicines, plastic curing agents, etc., along with the medicine and printing and dyeing industry With the rapid development of O-aminophenol, the market demand for o-aminophenol, a chemical intermediate, continues to rise, and its price immediately rises. However, the current large-scale o-aminophenol production process in China is mainly based on catal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C07C213/10C07C215/76C02F101/38C02F101/34
CPCC02F1/001C02F1/285C02F1/66C02F9/00C02F2101/345C02F2101/38C02F2301/08C07C213/10C07C215/76
Inventor 刘红院韩辉翟卫林冯志军
Owner XIAN LANSHEN NEW MATERIAL TECHNOLOGY CO LTD
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