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Method for processing nitrogen oxide

A technology of nitrogen oxides and oxidants, applied in chemical instruments and methods, separation methods, separation of dispersed particles, etc., can solve the problems of low investment, secondary pollution, and low removal efficiency

Inactive Publication Date: 2018-12-18
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process is simple, the investment is low, there are many absorbents available, and the NOx in the exhaust gas can be recycled in the form of nitrate, but the removal efficiency is low, the energy consumption is high, and the solution after absorbing the exhaust gas is difficult to handle, which is easy to cause secondary pollution. secondary pollution
In addition, the cost of absorbents, oxidants, reducing agents and complexes is high, and it is not suitable for exhaust gases with high concentrations of NOx
[0008] Nitric acid use and production units will produce a large amount of nitrogen oxide waste gas during the production process. The discharge of these waste gases not only has great harm to human beings and the ecological environment, but also causes a waste of resources.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take by weighing 1Kg of copper powder, add in the reaction kettle, slowly add 2.5L of 60% concentrated nitric acid, nitric acid reacts with copper powder rapidly, produces a large amount of reddish-brown nitrogen oxides (NO, NO 2 ), the reaction time is 30min. The generated nitrogen oxides are absorbed by four-stage series absorption method. Add 20L of hydrogen peroxide solution with a mass concentration of 10% into the absorption tower, add 10g of spherical nano-cerium oxide (its particle size is 4nm), and the ratio of the liquid level height to the diameter of the absorption tower is 1:5. Pass the generated nitrogen oxides into the bottom of the absorption liquid at a rate of 10000mg / min. The nitrogen oxides are fully contacted with the absorption liquid by means of dispersing pipelines, and the reaction is carried out at 15°C through a constant temperature control device. The concentration of nitrogen oxides in the tail gas after treatment by this process is 96.5mg...

Embodiment 2

[0028] Take by weighing silver powder 1Kg, add in reactor, slowly add 60% concentrated nitric acid 1.5L, nitric acid reacts with silver powder rapidly, produces a large amount of reddish-brown nitrogen oxides (NO, NO 2 ), the reaction time is 30min. 20L of hydrogen peroxide solution with a mass concentration of 10% was added to the absorption tower, and 15g of spherical nano-cerium oxide (its particle size was 6nm) was added, and the ratio of the liquid level height to the diameter of the absorption tower was 1:5. The generated nitrogen oxides are fed into the bottom of the absorption liquid at a rate of 5000 mg / min, and the nitrogen oxides are fully contacted with the absorption liquid by means of a dispersion pipeline, and the reaction is carried out at 25°C through a constant temperature control device. After this process, the concentration of nitrogen oxides in the exhaust gas is 87.9mg / m3 3 , in line with national environmental protection requirements. After multiple re...

Embodiment 3

[0032] Take by weighing 1Kg of cobalt powder, add in the reactor, slowly add 3L of 60% concentrated nitric acid, nitric acid reacts with cobalt powder rapidly, produces a large amount of reddish-brown nitrogen oxides (NO, NO 2 ), the reaction time is 30min. The generated nitrogen oxides are treated by four-stage series absorption method. Each adding mass concentration in the four-stage series absorption tower is 10% hydrogen peroxide solution 20L, adds 10g spherical nano ceria (its particle size is 4nm) simultaneously, the ratio of liquid level height and the diameter of absorption tower is 1: 5. The generated nitrogen oxides are fed into the bottom of the absorption liquid at a rate of 8000mg / min, and the nitrogen oxides are fully contacted with the absorption liquid by means of a dispersion pipeline, and the reaction is carried out at 35°C through a constant temperature control device. The concentration of nitrogen oxides in the tail gas after treatment by this process is ...

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Abstract

The invention provides a method for processing nitrogen oxide, comprising the following step: a gas containing nitrogen oxide and an absorption liquid are contacted to react so as to generate nitric acid, wherein the absorption liquid is an aqueous solution containing an oxidizing agent and nano-ceric oxide. According to the method for processing nitrogen oxide, by the use of nano-ceric oxide forcatalysis, nitrogen oxide generated during the production process can be converted to nitric acid. The catalytic conversion efficiency can reach 99% and above; the concentration of the generated nitric acid can reach 40%; and the tail gas reaches the national discharge standards (less than 240 mg / L).

Description

[0001] This application is a divisional application of the Chinese invention patent application with the same name filed on August 17, 2015 with the application number 201510502201.6. technical field [0002] The invention relates to a method for treating nitrogen oxides. Background technique [0003] Nitrogen oxide (NOx) is a highly toxic gas, which is directly discharged into the atmosphere without treatment, forming eye-catching brown (red) yellow smog. NOx is the most difficult to treat in many exhaust gases, and it is one of the culprits of air pollution . If it is not effectively controlled, it will not only cause great harm to the health of the operators and the environment of the factory area, but also cause public hazards to the lives of surrounding residents and the ecological environment if it spreads with the wind. Experts predict that if the control is not strengthened, nitrogen oxides will become the main pollutant of China's air pollution. [0004] At presen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/90B01D53/56
Inventor 陈凤娟蔡晓慧曹笃盟武小寒汪宝堆朱锐伦郑成宇郭廷宏马骞朱纪念陈国举张静刘国旗齐勇
Owner LANZHOU UNIVERSITY