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Treatment of wastewater from production of para-aminophenol and making it be resource

A technology for the production of p-aminophenol and wastewater, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., to achieve good regeneration performance, CODCr reduction, and lighten the pollution load.

Inactive Publication Date: 2005-12-28
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there has been no report on recycling waste water from p-aminophenol production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: Each 10 ml of NDA1800 (about 7 grams) and NDA-10 (about 7.5 grams) resins was loaded into a jacketed glass adsorption column (Φ12×160 mm). Adjust the pH of p-aminophenol production wastewater to 7 (it can be in the range of 5-9), and after filtration, at room temperature (-10-30°C), pass through it at a flow rate of 80ml / h (that is, 8 resin bed volumes) NDA1800 resin bed layer, the processing capacity is 400ml / batch, and it is collected in a clean and dry container. Then the primary adsorption water is passed through the NDA-10 composite functional adsorption resin bed at a flow rate of 20ml / h (ie, 2 resin bed volumes), and the wastewater treatment capacity is 100ml / batch. Raw wastewater TOC is 6100mg / L, COD Cr is 18000mg / L, the content of p-aminophenol is 7500mg / L, the TOC of the effluent after secondary adsorption is reduced to 300mg / L, and the COD Cr reduced to 950mg / L, the content of p-aminophenol was less than 10mg / L, and the adsorbed water was colorle...

Embodiment 2

[0025] Example 2: Use two PVC adsorption columns (Φ200*1400) to replace the two glass adsorption columns in Example 1, each column is filled with 25L of resin, and the waste water flow and treatment capacity in Example 1 are 2500 times higher. Operation, obtained the effects of adsorption treatment and resource recovery consistent with Example 1.

Embodiment 3

[0026] Example 3: Wastewater directly enters the composite functional resin NDA-10 resin column. Choose three PVC adsorption towers (Φ200*1400mm) with the same specifications (numbered I, II, and III respectively), and fill each tower with 25L (about 18Kg) of NDA-10 resin. At room temperature (-10 ~ 30 ℃), the p-aminophenol production wastewater (with a p-aminophenol content of about 2500mg / l) after adjusting the pH value and filtering is put into the adsorption tower, and the double towers (I, II towers) are connected in series. Flow adsorption and simultaneous desorption in a single tower (III tower). The adsorption flow is controlled at 50L / h, and the processing volume of each batch is controlled at 300L. After the wastewater is treated, the adsorbed water is colorless and transparent, and the p-aminophenol content is less than 10mg / L. The sodium chloride in the effluent can be further recovered.

[0027] The No. I adsorption tower, which has absorbed 300L waste water an...

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PUM

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Abstract

A resource treatment of p-aminophenol production waste water is carried out by regulating pH of p-aminophenol production waste water, filtering, selectively removing p-nitrochlorobenzene and p-nitrophenol etc. organic impurities from hydrophobic macro-porous resin, selectively adsorbing and recovering p-aminophenol from sulfoacid composite modifying resin, obtaining colorless transparent outlet water, after advanced treating the outlet water for diaphragm electrolysis requirement, recovering sodium chloride of waste water, eluting hydrophobic macro-porous adsorbing resin from organic solvent, desorbing sulfoacid composite modifying adsorbing resin from dilute acid and water, recovering p-aminophenol from high-concentrated desorbed liquid, and applying mechanically for next de-sorption from low-concentrated desorbed liquid. It achieves less organic pollution and resource utilization.

Description

1. Technical field [0001] The invention relates to a treatment and resource recovery method for waste water discharged during the production process of p-aminophenol, an organic intermediate in the medicine and dye industries. 2. Background technology [0002] p-Aminophenol, a typical aromatic amphoteric compound, is widely used in the fields of medicine, dyestuff and chemical industry. At present, p-nitrochlorobenzene is mostly used as raw material, hydrolyzed and hydrogenated and reduced under certain conditions, but no matter what synthesis route is adopted, the amount of waste water is relatively large, and on average, 1 ton of p-aminophenol will be produced Ten tons of waste water. The wastewater is golden yellow, the content of p-aminophenol is about 3000-8000mg / L, the TOC is above 6,000mg / L, and the content of inorganic salt in the wastewater is relatively high, about 10%-12% of sodium chloride, and a small amount of raw materials, intermediates. So far, there has ...

Claims

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Application Information

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IPC IPC(8): C02F9/04
Inventor 李爱民蔡建国张海云葛俊杰李正斌龙超刘福强张全兴
Owner NANJING UNIV
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