CN104045142A - Method for treating m-dinitrobenzene wastewater through catalytic reduction - Google Patents
Method for treating m-dinitrobenzene wastewater through catalytic reduction Download PDFInfo
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- CN104045142A CN104045142A CN201410320916.5A CN201410320916A CN104045142A CN 104045142 A CN104045142 A CN 104045142A CN 201410320916 A CN201410320916 A CN 201410320916A CN 104045142 A CN104045142 A CN 104045142A
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Abstract
The invention belongs to the technical field of wastewater treatment for environmental protection and relates to a method for treating m-dinitrobenzene wastewater through catalytic reduction. The method comprises the following main steps: adding a buffer solution and a certain concentration of m-dinitrobenzene wastewater to an anaerobic simulation reactor containing a catalyst-black charcoal powder weighed in advance, filling 99.99% of high-purity nitrogen into a reaction system (so as to remove oxygen in the system to form an anaerobic environment), adding a certain concentration of reducing agent-sodium sulfide to the system and finally putting the reactor in a rotary oscillator and carrying out oscillating reaction at normal temperature and pressure. The method has the advantages that the reaction system is mild, reaction is quick and efficient and the treatment cost is low, so that the method can conduce to solving practical problems and has obvious economic and environmental advantages.
Description
Technical field
The invention belongs to environment protection technical field of waste water processing, relate to a kind of method that catalytic reduction is processed Meta-dinitrobenzene waste water.
Background technology
Meta-dinitrobenzene is the important intermediate of synthetic dyestuff, pigment, explosive and other fine chemicals, is extensively present in the trade effluents such as dyestuff, medicine, agricultural chemicals, explosive.The production technique of Meta-dinitrobenzene is to take benzene as raw material, through sulfonation, nitrated, neutralization, reduction, alkali is molten and the process such as acid out is produced.The waste water complicated component of discharge, colourity is large, COD
crhigh.Meta-dinitrobenzene stable chemical performance, large to bio-toxicity, belong to difficult for biological degradation organic compound, directly discharge, by polluted waters, destroys ecological.
The method of processing Meta-dinitrobenzene waste water is mainly divided into: Physical, chemical method etc.What Physical was the most frequently used is extraction process and absorption method, as invention " a kind for the treatment of process of waste water from meta dinitro benzene production " (application number 200510094930.9), document " dinitrobenzene factory effluent is asked in extraction process pre-treatment " (Lin Zhongxiang, 2002).These technical process are relatively simple, and investment and running cost are not high yet, but the secondary pollution problems of the chemical substance that how to prevent from being separated is also needed further to study.What chemical method was conventional is chemical oxidization method and electrochemical process.Ozone Oxidation Treatment, as invention " a kind of ozone treatment method to dinitrobenzene in wastewater from car washer " (application number 201210025249.9); Chemical oxidization method, as document " utilizes Fenton reagent pre-treatment waste water from meta dinitro benzene production " (Yu Zongxue, 2002); Electrochemical method, as document " research of microelectrolysis processing waste water from meta dinitro benzene production " (Yu Zongxue, 2004).In addition also can be by chemical method and Physical coupling, as document " micro-electrolysis-catalyzed oxidation-absorption method is processed wastewater from dinitrobenzene " (the fourth Central Military Commission and river show China, 2006).The processing cost of chemical oxidization method is relatively high, realizes at home industrialization and needs time.As mentioned above, Meta-dinitrobenzene waste water is processed in developing into of these technology, alleviate Meta-dinitrobenzene class material and provide more means to the pollution of environment, but these methods all have certain defect and limitation, therefore be necessary to develop a kind of reaction conditions gentle, the treatment process of simple and easy to do economical and efficient.
In recent years, the method for chemical reduction method treatment of Nitrobenzene class waste water has received people's concern.It is reported, some nitryl aromatic compounds (as, oil of mirbane, 2,4-dinitrotoluene (DNT), 3-chloronitrobenzene, 4-nitrophenols etc.) under the effect of reductive agent and black wood charcoal, can there are reduction reaction (Kemper etc., 2008 fast; Oh etc., 2009; Yu etc., 2011; 2012; Amezquit etc., 2013).Yet there are no catalytic reduction method and process the related invention patent of Meta-dinitrobenzene waste water.
Summary of the invention
Object of the present invention is just to provide a kind of method that catalytic reduction is processed Meta-dinitrobenzene waste water.
Technical scheme of the present invention is as follows:
Catalytic reduction is processed a method for Meta-dinitrobenzene waste water, comprises the following steps:
(A) black wood charcoal that takes as required certain mass is as catalyzer, and transfers in the anaerobism analogue reactor of 1L;
(B) buffered soln of 0.1-0.2L, 20mM and the certain density Meta-dinitrobenzene waste water of 0.8L are joined in anaerobism analogue reactor, and reactor is sealed;
(C) with 99.99% high pure nitrogen, the oxygen in reactor head space and the aqueous solution is drained, to guarantee anaerobic state;
(D) according to different need to reductive agent sodium sulfide solution being joined in reactor with resistance to air loss syringe;
(E) reactor is placed on cyclotron oscillation device in normal temperature and pressure (25 ℃, 1atm) lower concussion reaction.
Black wood charcoal of the present invention is the carbon-bearing particulate matter with height aromatize structure that fossil oil and biomass incomplete combustion generate, and comprises charcoal, cigarette ash, flying dust and gac etc.
The concentration of catalyzer provided by the invention is 0.1-2.0g/L.
Damping fluid provided by the invention is: Na
2hPO
4/ NaH
2pO
4rush liquid, in order to regulate the pH value scope of reaction system between 5-9.
The concentration of the Meta-dinitrobenzene waste water that the present invention processes is 10-200mg/L.
Reductive agent provided by the invention is the solution that sodium sulphite configures, and its concentration is 35-240mg/L.
The rotating speed of concussion reaction provided by the invention is 150-200 rev/min.
Compared with prior art the present invention has the following advantages:
1. reaction system is gentle, and all reaction at normal temperatures and pressures, not only less demanding to conversion unit, consumes energy also very low, and method is simple, workable, is convenient to apply in practice;
2. quick and high efficient reaction, transforms thoroughly the reduction of pollutent, and the present invention reaches as high as 96% to the transformation efficiency of Meta-dinitrobenzene, makes its reduction be converted into aniline category matter, can not cause secondary pollution;
3. processing cost is low, and the present invention's reductive agent used is sodium sulphite, and catalyzer is black wood charcoal, is cheaply easy to get, and preparation is simple and reactive behavior is high, and black wood charcoal is reusable after cleaning, and saves cost, has significant environmental advantage and economic advantages.
Embodiment
By the following examples method and the effect of catalytic reduction processing Meta-dinitrobenzene waste water provided by the invention are further described, but not thereby limiting the invention.
Embodiment 1: sodium sulphite reduction Meta-dinitrobenzene
In 8 1L anaerobism analogue reactors, adding pH is the Meta-dinitrobenzene waste water that 7 phosphate buffered saline buffer and concentration are 80mg/L, in reactor, be filled with high pure nitrogen (to remove the oxygen in reaction system, form anaerobic environment), in reactor, add respectively 35mg/L, 100mg/L, 170mg/L, 240mg/L reductive agent sodium sulfide solution, then, in 1-4 reactor, do not add catalyzer, in 5-8 reactor, add respectively 1g black wood charcoal (what use in the present embodiment is gac) as catalysts.Reactor sealing is placed in to gyrate shaker, and the rotating speed concussion with 150-200 rev/min under normal temperature and pressure is reacted 96 hours, and after reaction, reduzate is aniline category matter.The transformation efficiency of Meta-dinitrobenzene is in Table 1.
The transformation efficiency of Meta-dinitrobenzene under table 1 sodium sulphite reductive condition
Embodiment 2: under condition of different pH, the reduction of Meta-dinitrobenzene transforms
Be with the difference of embodiment 1, to the reductive agent sodium sulphite that adds respectively 170mg/L in 10 reactors.Then, in 1-5 reactor, do not add catalyzer, in 6-10 reactor, add respectively 1g black wood charcoal (what use in the present embodiment is gac) as catalysts.。In different reactors, add respectively different damping fluids, make the pH of reaction system be respectively 5,6,7,8,9, react Meta-dinitrobenzene transformation efficiency after 96 hours in Table 2.
The transformation efficiency of Meta-dinitrobenzene under table 2 condition of different pH
Embodiment 3: under different catalysts concentration conditions, the reduction of Meta-dinitrobenzene transforms
As different from Example 1, to the reductive agent sodium sulphite that adds respectively 170mg/L in 5 reactors, then, in reactor, add respectively a certain amount of black wood charcoal (what use in the present embodiment is gac) as catalysts, make that its concentration is 0.1,0.3,0.5,0.7,1.0g/L.Reactor sealing is placed in to gyrate shaker, and the rotating speed concussion with 150-200 rev/min under normal temperature and pressure is reacted 96 hours, and the transformation efficiency of Meta-dinitrobenzene is in Table 3.
Under table 3 different catalysts concentration conditions, the reduction of Meta-dinitrobenzene transforms
Embodiment 4: when catalyzer is reused, the reduction of Meta-dinitrobenzene transforms
As different from Example 1, the reductive agent sodium sulphite to adding respectively 170mg/L in 5 reactors, then, adds respectively the reusable black wood charcoal of 1g (what use in the present embodiment is gac) as catalysts in reactor.Reactor sealing is placed in to gyrate shaker, and the rotating speed concussion with 150-200 rev/min under normal temperature and pressure is reacted 96 hours.The transformation efficiency of Meta-dinitrobenzene is in Table 4.
Under table 4 different catalysts concentration conditions, the reduction of Meta-dinitrobenzene transforms
Claims (7)
1. catalytic reduction is processed a method for Meta-dinitrobenzene waste water, it is characterized in that comprising the following steps:
(A) black wood charcoal that takes as required certain mass is as catalyzer, and transfers in the anaerobism analogue reactor of 1L;
(B) buffered soln of 0.1-0.2L, 20mM and the certain density Meta-dinitrobenzene waste water of 0.8L are joined in anaerobism analogue reactor, and reactor is sealed;
(C) with 99.99% high pure nitrogen, the oxygen in reactor head space and the aqueous solution is drained, to guarantee anaerobic state;
(D) according to different need to reductive agent sodium sulfide solution being joined in reactor with resistance to air loss syringe;
(E) reactor is placed on cyclotron oscillation device in normal temperature and pressure (25 ℃, 1atm) lower concussion reaction.
2. catalytic reduction is processed the method for Meta-dinitrobenzene waste water according to claim 1, it is characterized in that: the described catalyzer black wood charcoal of step (A) is the carbon-bearing particulate matter with height aromatize structure that fossil oil and biomass incomplete combustion generate, and comprises charcoal, cigarette ash, flying dust and gac etc.
3. catalytic reduction is processed the method for Meta-dinitrobenzene waste water according to claim 1, it is characterized in that: the concentration of the described catalyzer of step (A) is 0.1-2.0g/L.
4. catalytic reduction is processed the method for Meta-dinitrobenzene waste water according to claim 1, it is characterized in that: the described damping fluid of step (B) is Na
2hPO
4/ NaH
2pO
4rush liquid, in order to regulate the pH value scope of reaction system between 5-9.
5. catalytic reduction is processed the method for Meta-dinitrobenzene waste water according to claim 1, it is characterized in that: the concentration of the described Meta-dinitrobenzene waste water of step (D) is 10-200mg/L.
6. catalytic reduction is processed the method for Meta-dinitrobenzene waste water according to claim 1, it is characterized in that: the described reductive agent of step (D) is the solution that sodium sulphite configures, and its concentration is 35-240mg/L.
7. catalytic reduction is processed the method for Meta-dinitrobenzene waste water according to claim 1, it is characterized in that: the rotating speed of the described concussion reaction of step (E) is 150-200 rev/min.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106477769A (en) * | 2016-10-26 | 2017-03-08 | 浙江奇彩环境科技股份有限公司 | A kind of processing method of nitrobenzene compounds waste water |
| CN110002532A (en) * | 2019-03-18 | 2019-07-12 | 中国科学院化学研究所 | A method of utilizing black carbon light degradation Organic Pollutants In Water |
-
2014
- 2014-07-08 CN CN201410320916.5A patent/CN104045142A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106477769A (en) * | 2016-10-26 | 2017-03-08 | 浙江奇彩环境科技股份有限公司 | A kind of processing method of nitrobenzene compounds waste water |
| CN110002532A (en) * | 2019-03-18 | 2019-07-12 | 中国科学院化学研究所 | A method of utilizing black carbon light degradation Organic Pollutants In Water |
| CN110002532B (en) * | 2019-03-18 | 2020-08-21 | 中国科学院化学研究所 | Method for degrading organic pollutants in water body by using black carbon light |
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Application publication date: 20140917 |