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New method for treating nitrogen oxide waste gas

A nitrogen oxide and nitric oxide technology, applied in chemical instruments and methods, nitrous oxide capture, separation methods, etc., can solve problems that do not conform to the law of chemical reactions, achieve the effect of improving absorption efficiency and broad application prospects

Inactive Publication Date: 2013-12-25
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the relationship between the reaction rate constant and temperature does not conform to the general law of chemical reactions.

Method used

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  • New method for treating nitrogen oxide waste gas
  • New method for treating nitrogen oxide waste gas
  • New method for treating nitrogen oxide waste gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Embodiment 1: Determination of absorption solvent and its absorption capacity

[0043] use figure 2 In the first absorption bottle, organic solvents such as esters, alcohols or ketones are put into the first absorption bottle to absorb NO, and the NO content in the exhaust gas passing through the absorption bottle is detected to determine the effect of the solvent in the first absorption bottle on NO. The absorption effect, the method is to oxidize the tail gas through an acidic potassium permanganate solution to oxidize the incompletely absorbed NO into NO 2 , NO 2 After being dissolved in water, it can be absorbed by the water in the second absorption bottle, and its content can be detected by Griess reagent method. The method is under acidic conditions, nitrite NO 2 - It can undergo diazotization reaction with Griess reagent (p-aminobenzenesulfonic acid, N-(1-naphthalene) ethylenediamine, hydrochloric acid) to generate pink diazo compound, which has the maximum ...

Embodiment 2

[0048] Embodiment 2; Absorption of NO and NO with water and alkaline aqueous solution 2 Comparison of the effect of mixed gas

[0049] 2 mmol NaNO 2 Reaction under acidic conditions to produce 1:1 NO and NO 2 , through the primary absorption bottle 100ml water, 100ml NaOH solution (containing NaOH 20mmol) or 100ml Y-MS-butyl acetate (Y-MS concentration is 0.1mol / L, the same below), the secondary absorption bottle is 100ml Y-MS- Butyl acetate, then the gas that has not been absorbed by the primary absorption bottle will be absorbed in the secondary absorption bottle, and the subsequent reaction will cause it to develop a blue-green color. From the degree of color development, it can be judged that the primary absorption liquid absorbs NO-NO 2 s efficiency. When the absorption solution is water and NaOH solution, after the gas absorption is complete, take 0.5ml for Griess color development. The results are shown in Table 2, it can be seen that butyl acetate has a significant...

Embodiment 3

[0053] The MS-Y-BA solution is used as the NO absorption solution, and the reaction device is not removed after the absorption is complete, so that the whole system is placed in an oxygen-free environment. After directly heating the absorption bottle for a period of time, no blue-green color is formed. It shows that the oxidation of NO can only be carried out in the presence of oxygen. After taking part of the liquid from the stopcock at the bottom of the absorption bottle and heating it in air for a few minutes, the color of the solution changed, initially light yellow, then green, and finally blue-green. It shows that the color reaction is an aerobic reaction, that is, the oxygen content is the controlling factor mentioned in Example 1. In order to further prove that the color development process requires oxygen to oxidize NO into NO 2 , we directly put NO and NO 2 (by NaNO 2 obtained by reaction under acidic conditions) into the Y-MS-butyl acetate mixed solution to see ...

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Abstract

The invention relates to a new method for treating nitrogen oxide waste gas. The new method for treating the nitrogen oxide waste gas comprises three key links, namely efficient absorption of an organic solvent, catalytic oxidation and subsequent water extraction, wherein the organic solvent is a mixed organic solvent mainly comprising one or more esters, alcohols and ketones; nitrogen monoxide and oxygen which are absorbed by the organic solvent are oxidized into nitrogen dioxide and dinitrogen trioxide under the catalytic action of a rare earth complex, and then water extraction is carried out, so as to obtain an aqueous solution of dinitrogen trioxide, nitrous acid and nitric acid; the aqueous solution can be applied to a nitration and nitrosylation reaction or be recycled as an oxidizing agent, and the organic solvent can be recycled and applied to absorption of nitrogen monoxide; the rare earth complex has the catalytic oxidation function and is formed by rare earth and a phenolic ester compound, and complexing capacity of the rare earth complex is approximate to that of rare earth and nitrogen oxide. The new method for treating the nitrogen oxide waste gas is applicable to absorption, conversion and utilization of low-concentration nitrogen oxide, and harm to the environment owning to emission of waste gas is eliminated.

Description

technical field [0001] The invention relates to a high-efficiency treatment method for nitrogen oxide waste gas using the dissolution and absorption of organic solvents and the catalytic oxidation function of rare earth complexes, especially suitable for the absorption and recovery of low-concentration nitrogen monoxide waste gas, and belongs to the fields of environmental protection, organic chemistry and rare earth materials . technical background [0002] Nitrogen oxides (NOx) are the main pollutants that cause acid rain and photochemical smog, which will bring serious harm to the natural environment and human production activities, including toxic effects on the human body, damage to plants, and destruction of the ozone layer. Therefore, since the 1970s, developed countries such as Europe, the United States, and Japan have successively imposed restrictions on NOx emissions, and with the development of technology and economy, the restrictions have become increasingly stri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/56
CPCY02C20/10
Inventor 李永绣张诗晗刘艳珠周新木周雪珍张玲邹秀新
Owner NANCHANG UNIV
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