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Treatment for wastewater in para-nitraniline production and method for resource recovery and use

A technology for p-nitroaniline and waste water production, applied in water/sewage treatment, chemical instruments and methods, adsorption water/sewage treatment, etc. problem, to achieve the effect of good economic benefits, resource regeneration, and good adsorption performance

Inactive Publication Date: 2008-08-20
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the unsatisfactory adsorption performance (including adsorption capacity, adsorption and desorption speed, service life, etc.) of these materials, the amount of adsorbent is large, the adsorption tower equipment is huge, and the investment and operation costs are high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Pass the production wastewater with pH about 11.5, p-nitroaniline about 8000mg / L, total organic carbon 4173mg / L, ammonium chloride 1.5%, and free ammonia about 7% through the crystallization tank (10°C), filter and go through deamination still, reclaim most of p-nitroaniline and free ammonia, and obtain a filtrate with a pH of about 11.5, a p-nitroaniline content of about 500 mg / L, a total organic carbon content of 260 mg / L, and an ammonium chloride content of 1.5%. It was filtered and the pH was adjusted to 6 with hydrochloric acid.

[0030] Fill 2 grams of activated carbon fibers whose model is ST-1600 (Nantong Senyou Activated Carbon Fiber Co., Ltd.) into a jacketed glass adsorption column (15 × 170mm), and the filling volume of activated carbon fibers is 22cm 2 . The filtrate flows through the carbon fiber packed bed at a flow rate of 600ml / h at room temperature, the wastewater treatment capacity is 1700ml / batch, and the adsorbed water is colorless and transparent,...

Embodiment 2

[0034] With other conditions in example 1 unchanged, the flow rate of filtrate through carbon fiber packed bed is changed to 200ml / h, and under other conditions, the wastewater treatment capacity reaches 1900ml, which is slightly higher than example 1, while adsorption effect, desorption rate Wait basically unchanged.

Embodiment 3

[0036] With other conditions constant in example 1, filtrate temperature is reduced to 5 ℃, under other conditions constant, wastewater treatment capacity reaches 2000ml, higher than example 1, and adsorption effect, desorption rate etc. are basically unchanged.

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Abstract

The invention discloses a method for nitroaniline wastewater treatment and recycling, comprising a plurality of steps: cool p-nitroaniline mother liquor wastewater and crystals are allowed to be separated out; filter the wastewater after crystal precipitation and remove the free ammonia in the filtrate; filter the effluent ever treated at the procedure B and change PH value to acidity or weak alkalinity; use the viscose-based active carbon fiber made by phosphate-impregnated high-temperature steam activation to absorb the p-nitroaniline wherein; evaporate and concentrate the absorbed water; precipitate crystal and filter out ammonium chloride crystal. The active carbon fiber has large absorption capacity and fast absorption speed for p-nitroaniline and can be utilize repeatedly, which makes the recovery rate of p-nitroaniline near 100%. The method has the advantages that the method can fully recover p-nitroaniline and free ammonia in the p-nitroaniline wastewater and the byproduct of ammonium chloride, realizing the unification of wastewater treatment and resources recovery; the method is of great economic and practical value in the treatment of p-nitroaniline wastewater.

Description

technical field [0001] The invention belongs to the field of waste water treatment, and in particular relates to a method for the treatment and resource recycling of p-nitroaniline production waste water with high chroma and refractory degradation produced in the production process of p-nitroaniline. Background technique [0002] p-Nitroaniline is an important chemical raw material, also known as ice dye scarlet GG color base, mainly used as an intermediate of azo dyes, medicines and pesticides, and also used in the manufacture of engineering plastics and daily chemicals. It is more toxic than aniline, can cause blood poisoning, skin eczema and dermatitis, and damage the liver. It is a priority pollutant in my country's water pollution control. There are two production methods for p-nitroaniline. The ammonolysis method is basically adopted in China, that is, the melted p-nitrochlorinated benzene is added to the high-pressure ammonolysis kettle, and then excess ammonia water ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/58C02F1/66C02F1/28C01C1/16C07C211/52
Inventor 郑正李坤权黄兴发罗兴章冯景伟张继彪赵国华李培培李军状聂耳孟卓
Owner NANJING UNIV
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