Method for treating wastewater generated from fabricating nitrophenol as well as for reclaiming and using resources

A technology for p-nitrophenol and waste water production, applied in separation methods, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of high investment and operating costs, large adsorption tower equipment, adsorption performance, adsorption capacity, adsorption and desorption. The problems of unsatisfactory speed and service life are attached to achieve the effect of cleaner production resources

Inactive Publication Date: 2005-01-12
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 equipment of the adsorption tower 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

[0022] Cool and filter the production waste water with pH about 1-2, p-nitrophenol about 5741 mg / L, total organic carbon 3326 mg / L, and sodium chloride 14%, recover part of p-nitrophenol crystals, and obtain a pH of about 1 ~2. The filtrate of p-nitrophenol 4395mg / L, total organic carbon 2500mg / L, sodium chloride mass concentration 14%.

[0023] Fill 4g of A12 activated carbon fiber (Shenyang Tianyu Purification Material Factory) into a jacketed glass adsorption column (15 × 200mm), and the activated carbon fiber filling volume is 25cm 3 . The filtrate flows through the activated carbon fiber packed bed at a flow rate of 250mL / h at room temperature, the wastewater treatment capacity is 400mL, and the adsorbed water is colorless and transparent, wherein the removal rate of p-nitrophenol is close to 100%, and the total organic carbon is less than 20mg / L.

[0024] The water from the adsorption is adjusted to about pH 7 by adding sodium hydroxide, and sent to the brine refining s...

Embodiment 2

[0027] The adsorbent activated carbon fibers in Example 1 were changed to activated carbon fibers of models such as A10, YT1000, YT1300, YT1600, etc., and other treatment methods were the same as in Example 1. As a result, in addition to the change in the amount of wastewater treated in each batch, other factors such as adsorption effect and desorption rate remained basically unchanged.

Embodiment 3

[0029] With other conditions unchanged in Example 1, the wastewater treatment capacity is 180mL; 25mL of hot water with a concentration of 2% sodium hydroxide and 75mL of hot water are used as desorbents, and the adsorption effect is very good, and the desorption rate is basically maintained. constant.

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PUM

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Abstract

The prodn. process are: pretreatment, adsorpting adsorpting para-nitrophenol in waste water, recovering and utilizing sodium chloride, deadsorpting obsorbed para-nitrophenol. The outstanding characteristic is that recovering ratio for nitrophenol is approach 100 percent, the recovered nitrophenol is reused by being send back to prodn process, large quantity of sodium chloride in waste water is used to produce caustic soda and hydrochloric which can be circulating used.

Description

1. Technical field [0001] The invention relates to a method for treating p-nitrophenol production wastewater discharged from industries such as fine chemical industry and pharmaceutical industry and recycling resources. 2. Background technology [0002] p-Nitrophenol is an important medicine, pesticide and dye intermediate. One of its production processes is to synthesize p-nitrochlorobenzene through hydrolysis-acidification and other reactions. p-Nitrophenol is a priority pollutant in water pollution control in my country. The pH value of p-nitrophenol production wastewater is generally 1 to 2, and the COD Cr (Chemical oxygen content) 10000-15000mg / L, p-nitrophenol 3000-8000mg / L, sodium chloride mass concentration 14-15%. The treatment methods for high-concentration p-nitrophenol wastewater mainly include chemical oxidation, extraction, and adsorption. At present, the extraction method is mostly used, but after multi-stage extraction, the concentration of p-nitrophenol ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/34C02F1/28C02F1/461C02F1/58
Inventor 唐登勇郑正周培国郭照冰江芳周涛倪利晓纪容昕苏东辉靳强杨光俊牟艳艳顾春晖帖靖玺魏钟波彭波张继彪谭巧国吴文继
Owner NANJING UNIV
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