Preparation method of modified lignin absorbent for absorbing TNT (Trinitrotoluene)

A technology of lignin and adsorbent, applied in the field of preparation of lignin derivatives, can solve the problems of difficult post-processing, low reuse rate, damage to the blood circulation system and nervous system, etc., achieves high adsorption selective adsorption capacity, overcomes the Poor adsorption selectivity and the effect of saving oil resources

Inactive Publication Date: 2012-02-22
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
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Problems solved by technology

[0003] However, TNT is also a toxic, carcinogenic and mutagenic substance
During the production and refining process of TNT, a large amount of explosive wastewater with complex components, high toxicity, large discharge, high chroma and COD value, and difficult to treat is produced. These explosive wastewater contain a variety of organic substances, the most abundant of which is TNT
Studies have shown that the discharge of explosive wastewater can easily pollute water sources, and TNT in wastewater can easily accumulate in the soil, causing soil pollution
The soil has a strong adsorption and enrichment effect on TNT. The roots of plants absorb and store TNT through the soil, which is absorbed by the organism through the biological chain, and finally transferred to the human body through the food chain, affecting human health; at the same time, TNT in the soil penetrates from the surface to the ground, causing groundwater pollution, and drinking polluted water sources for humans will also affect human health; fish cannot survive in water with a TNT content higher than 1mg / L; TNT can also enter the human and human body through the respiratory system, digestive system and skin. In animals, it can also damage the blood circulation system and nervous system, cause liver disease, aplastic anemia and cataract, etc., and even lead to death, seriously damaging human health
[0004] Because TNT contains nitro, it is dangerous, biologically toxic and chemically stable, and it is easy to produce other more toxic intermediate products during the degradation process, which makes its degradation very difficult
In the prior art, methods for treating TNT pollutants generally adopt methods such as chemical oxidation and activated carbon adsorption, but chemical oxidation must be carried out under high temperature and high pressure operating conditions, and because strong oxidants must be used, it is likely to cause secondary pollution to the environment , the activated carbon adsorption method has the disadvantages of high cost of activated carbon, low recycling rate and difficult post-treatment

Method used

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  • Preparation method of modified lignin absorbent for absorbing TNT (Trinitrotoluene)
  • Preparation method of modified lignin absorbent for absorbing TNT (Trinitrotoluene)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 10g of dry lignin to 300g of 1,2-dichloroethane, heat and stir in a water bath at 65°C, add 20g of anhydrous AlCl 3 , 1.5h and then add 10g of anhydrous AlCl 3 (anhydrous aluminum chloride), after another 1.5h, add 5g of anhydrous AlCl 3 , and then heated for 2.5h (total time 5.5h); the reacted mixture was quickly poured into a mixture of ice and 7% dilute hydrochloric acid (both weight ratio 1:4), stirred, and filtered with a strainer; Dilute hydrochloric acid and water to remove AlCl 3 , dried at 90°C for 24 hours; the dried solid was taken out, washed with alcohol until the filtrate was colorless, and dried at 65°C for 12 hours to obtain chlorinated lignin. Add 150g of ethylenediamine to 50g of N,N-dimethylformamide, then add 7g of chlorinated lignin, and after bathing in water at 80°C for 6 hours, filter the reacted mixture, wash it successively with dilute ammonia water and water, and finally wash it with Wash with acetone until the filtrate is colorless, an...

Embodiment 2

[0029]Add 5g of dry lignin to 200g of 1,2-dichloroethane, heat and stir in a water bath at 70°C, add 15g of anhydrous AlCl 3 , 2h and then add 10g of anhydrous AlCl 3 , and then heated for 2.5h (total time 4.5h). The reacted mixture was quickly poured into a mixture of ice and 5% dilute hydrochloric acid (the weight ratio of the two was 1:3), stirred, and filtered with a filter; 3 , dried at 95°C for 24 hours; the dried solid was taken out, washed with acetone until the filtrate was colorless, and dried at 65°C for 10 hours to obtain chlorinated lignin. Add 100g of ethylenediamine to 20g of N,N-dimethylformamide, heat and stir in a water bath at 90°C, then add 3g of chlorinated lignin, and after 5 hours in a water bath at 90°C, filter the reacted mixture, and wash with dilute Wash with ammonia water and water, and finally wash with acetone until the filtrate is colorless, and dry at 100° C. for 12 hours to obtain a brown modified lignin adsorbent that can be used to adsorb T...

Embodiment 3

[0032] Add 10g of dry lignin to 300g of 1,2-dibromoethane, heat and stir in a water bath at 60°C, add 20g of anhydrous AlCl 3 , 2h and then add 10g of anhydrous AlCl 3 , after another 2h, add 5g of anhydrous AlCl 3 , and then heated for 3h (total time 7h); the reacted mixture was quickly poured into a mixture of ice and 3% dilute hydrochloric acid (both weight ratio 1:2), stirred, and filtered with a filter screen; and water to remove AlCl 3 , dried at 100°C for 18 hours; the dried solid was taken out, washed with alcohol until the filtrate was colorless, and dried at 65°C for 12 hours to obtain brominated lignin. Add 200g of ethylenediamine to 50g of N,N-dimethylformamide, then add 7g of brominated lignin, and after 8 hours in a water bath at 70°C, filter the reacted mixture, wash it successively with dilute ammonia water and water, and finally wash it with Wash with acetone until the filtrate is colorless, and dry at 60°C for 24 hours to obtain a brown modified lignin ads...

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Abstract

The invention discloses a preparation method of a modified lignin absorbent for absorbing TNT (Trinitrotoluene), which is characterized by comprising the steps of: adding 5-30 parts by weight of lignin into 150-500 parts by weight of 1,2-alkyl dihalide, adding 15-50 parts of catalysts, stirring for 3-10 hours at 50-90 DEG C, washing reacted materials by using a mixture of ice and diluted hydrochloric acid, filtering and washing by using water, and drying to prepare grafted halogenated lignin; and then adding 50-300 parts of aminating agents into 20-80 parts of organic solvents, adding 5-30 parts of the grafted halogenated lignin, stirring for 4-10 hours at 60-90 EG C, filtering, washing by using diluted ammonia water and water, and drying to obtain the modified lignin absorbent. The absorbent has higher selective absorption capacity on the TNT and other organic compounds containing nitryl and can be used for absorption and separation of the TNT and other organic compounds containing the nitryl in the explosive industrial wastewater so as to protect the environment.

Description

technical field [0001] The invention belongs to a preparation method of lignin derivatives, and relates to a preparation method of a modified lignin adsorbent used for adsorbing TNT. The prepared modified lignin adsorbent is especially suitable for adsorption and purification treatment of TNT-containing wastewater, so as to protect the environment and human health. Background technique [0002] TNT (ie: 2,4,6-trinitrotoluene; trinitrotoluene; TNT) is one of the most widely used explosives in the world. TNT is widely used in military and civilian applications because of its easy-to-obtain raw materials, relatively safe operation, relatively stable physical and chemical properties, good explosive performance, and low cost. Its consumption and output rank first in the world. [0003] However, TNT is also a toxic, carcinogenic and mutagenic substance. During the production and refining process of TNT, a large amount of explosive wastewater with complex components, high toxicit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28B01J20/32B01J20/24C02F101/38C02F103/36
Inventor 林晓艳张建平罗学刚
Owner SOUTHWEAT UNIV OF SCI & TECH
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