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Method for treating m-dinitrobenzene wastewater through catalytic reduction

A technology for m-dinitrobenzene and waste water, which is applied in the fields of reduced water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., to achieve the effects of simple preparation, strong operability, and simple and easy method.

Inactive Publication Date: 2014-09-17
BEIJING NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are no related invention patents for the catalytic reduction method to treat m-dinitrobenzene wastewater

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  • Method for treating m-dinitrobenzene wastewater through catalytic reduction
  • Method for treating m-dinitrobenzene wastewater through catalytic reduction
  • Method for treating m-dinitrobenzene wastewater through catalytic reduction

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Embodiment 1

[0024] Embodiment 1: sodium sulfide reduction m-dinitrobenzene

[0025] In 8 1L anaerobic simulated reactors, adding pH is 7 phosphate buffer solution and concentration is the m-dinitrobenzene waste water of 80mg / L, is filled with high-purity nitrogen in reactor (to remove reaction system Oxygen, form anaerobic environment), in reactor, add respectively 35mg / L, 100mg / L, 170mg / L, 240mg / L reducing agent sodium sulfide solution, then, do not add catalyst in No. 1-4 reactor, in 5 -Add 1g of black carbon (activated carbon used in this embodiment) as reaction catalyst in No. 8 reactor. The reactor is sealed and placed in a rotary oscillator, and the reaction is shaken at a speed of 150-200 rpm at normal temperature and pressure for 96 hours, and the reduced products after the reaction are anilines. The conversion rate of m-dinitrobenzene is shown in Table 1.

[0026] The conversion rate of m-dinitrobenzene under the reducing condition of sodium sulfide in table 1

[0027]

Embodiment 2

[0028] Embodiment 2: Reductive conversion of m-dinitrobenzene under different pH conditions

[0029] The difference from Example 1 is that 170mg / L reducing agent sodium sulfide was added to 10 reactors respectively. Then, no catalyzer was added in No. 1-5 reactors, and 1 g of black carbon (using activated carbon in this embodiment) was respectively added as a reaction catalyst in No. 6-10 reactors. . Different buffer solutions were added to different reactors, so that the pH of the reaction system was 5, 6, 7, 8, and 9 respectively. The conversion rate of m-dinitrobenzene after 96 hours of reaction is shown in Table 2.

[0030] The conversion rate of m-dinitrobenzene under different pH conditions in table 2

[0031]

Embodiment 3

[0032] Embodiment 3: Reductive conversion of m-dinitrobenzene under different catalyst concentration conditions

[0033] Different from Example 1, add 170mg / L reducing agent sodium sulfide respectively in 5 reactors, then, add a certain amount of black carbon (using gac in this embodiment) respectively in the reactors as reaction catalyst , so that the concentration is 0.1, 0.3, 0.5, 0.7, 1.0g / L. The reactor was sealed and placed in a rotary shaker, and the reaction was shaken at a speed of 150-200 rpm at normal temperature and pressure for 96 hours. The conversion rate of m-dinitrobenzene is shown in Table 3.

[0034] Table 3 Reductive conversion of m-dinitrobenzene under different catalyst concentrations

[0035]

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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 [0001] The invention belongs to the technical field of environmental protection wastewater treatment and relates to a method for catalytic reduction treatment of m-dinitrobenzene wastewater. Background technique [0002] m-Dinitrobenzene is an important intermediate for the synthesis of dyes, pigments, explosives and other fine chemicals, and widely exists in industrial wastewater such as dyes, medicines, pesticides and explosives. The production process of m-dinitrobenzene is to use benzene as raw material, and it is prepared through sulfonation, nitration, neutralization, reduction, alkali dissolution and acid precipitation. The discharged wastewater has complex components, large chroma, COD Cr high. m-Dinitrobenzene has stable chemical properties and is highly toxic to organisms. It is a refractory biodegradable organic compound. Direct discharge will pollute water areas and destroy ecology. [0003] The methods for treating m-dinitrobenzene wastewater ...

Claims

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Application Information

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IPC IPC(8): C02F1/70C02F101/38
Inventor 刘新会巩文雯于艳君侯静梁宝翠赵胜男
Owner BEIJING NORMAL UNIVERSITY
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