DNT (Dinitrotoluene) production wastewater recycling and treatment system and method

Abstract

The invention provides a DNT (Dinitrotoluene) production wastewater recycling and treatment system and method. The DNT production wastewater recycling and treatment system comprises a sedimentation tank, wherein the sedimentation tank is communicated with a filter, the outlet of the filter is communicated with the inlet of a macroporous adsorption resin column, the macroporous adsorption resin column is also provided with a desorption liquid inlet and a desorption liquid outlet, the desorption liquid inlet of the macroporous adsorption resin column is communicated with an organic solvent storage tank, the desorption liquid outlet of the macroporous adsorption resin column is communicated with a desorption liquid storage tank, and the desorption liquid storage tank is communicated with a rectifying tower. DNT in the wastewater is adsorbed through the macroporous styrene adsorption resin to prevent DNT from flowing out along with the wastewater, the resin is subjected to desorption and regeneration using an organic solvent, the desorption liquid is collected for rectification to separate out DNT, and DNT is recycled. The method is simple in operation process, not only is wastewater treated, but also DNT in the wastewater is recycled, and the method can be applied to continuous wastewater treatment, and is low in cost and suitable for industrialized large-scale DNT wastewater treatment.

Description

technical field [0001] The invention relates to the field of chemical wastewater treatment and recovery, in particular to a DNT production wastewater recovery and treatment system and method. Background technique [0002] 2,4-Dinitrotoluene (DNT) is an important basic chemical raw material, widely used in organic synthesis, for the preparation of dyes, paints, coatings, DNT is generally made of toluene in the presence of sulfuric acid, through nitric acid multi-step nitration Come, this method produces DNT and will discharge a large amount of waste water, slightly bitter metallic taste through the water body polluted by DNT, in pale yellow, has poisonous effect to aquatic organisms, when concentration reaches greater than 10mg / L, can cause fish and Death to aquatic organisms, carcinogenic. [0003] Guo Nan from Beijing Institute of Technology, Liu Yuncun from North University of China and others reported that activated carbon adsorption, advanced oxidation, supercritical wa...

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Problems solved by technology

[0002] 2,4-Dinitrotoluene (DNT) is an important basic chemical raw material, widely used in organic synthesis, for the preparation of dyes, paints, coatings, DNT is generally made of toluene in the presence of sulfuric acid, through nitric acid multi-step nitration Come, this method produces DNT and will discharge a large amount of waste water, slightly bitter metallic taste through the water body polluted by DNT, in pale yellow, has poisonous effect to aquatic organisms, when concentration reaches greater than 10mg / L, can cause fish and Death to aquatic organisms, carcinogenic

[0003] Guo Nan from Beijing Institute of Technology, Liu Yuncun from North University of China and others reported that activated carbon adsorption, advanced oxidation, supercritical water oxidation and other methods are used to treat DNT wastewater, but activated carbon adsorption not only has high treatment costs, but also may cause secondary pollution Secondary pollution, the advanced oxidation method is only applicable to the situation where the concentration of pollutants is low and the reaction conditions are relatively high, so the cost of this method to treat DNT production wastewater is also very expensive, and large-scale industrial treatment is not possible; although supercritical water oxidation treatment DNT production wastewater has made some progress, but the reaction temperature and pressure of the supercritical water oxidation method are too high, and there is also the problem of high treatment cost and difficult industrial application.

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