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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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

So far, there has been no report on recycli

Method used

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Examples

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Example Embodiment

[0023] Example 1: Put each 10ml of NDA1800 (about 7 grams) and NDA-10 (about 7.5 grams) resin into a jacketed glass adsorption column (Φ12×160mm). Adjust the pH of the p-aminophenol production wastewater to 7 (which can be in the range of 5-9), after filtering, pass through at a flow rate of 80ml / h (ie 8 resin bed volumes) at room temperature (-10~30℃) NDA1800 resin bed, the processing capacity is 400ml / batch, and it is collected in a clean and dry container. Then the effluent from the first stage adsorption is passed through the NDA-10 composite functional adsorption resin bed at a flow rate of 20ml / h (that is, 2 resin bed volumes), and the wastewater treatment capacity is 100ml / batch. TOC of original wastewater is 6100mg / L, COD Cr 18000mg / L, the content of p-aminophenol is 7500mg / L, the TOC of the effluent after the secondary adsorption drops to 300mg / L, COD Cr Reduced to 950mg / L, the content of p-aminophenol is less than 10mg / L, and the adsorbed water is colorless and transpare...

Example Embodiment

[0025] Example 2: Two PVC adsorption columns (Φ200*1400) were used to replace the two glass adsorption columns in Example 1, and each column was filled with 25L of resin. The wastewater flow rate and treatment volume were 2500 times that of Example 1. By operation, the effect of adsorption treatment and resource recovery consistent with Example 1 was obtained.

Example Embodiment

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

[0027] The No. I adsorption tower containing NDA-10 composite functional adsorptio...

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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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