Treating fluid for treating nitric oxide in waste gas

A nitrogen oxide and treatment liquid technology, applied in chemical instruments and methods, dispersed particle separation, separation methods, etc., can solve the problems of difficult to meet the standard treatment, complex process, a large amount of urea waste liquid, etc., to reduce equipment investment costs and Operating costs, extensive promotion and application value, and high processing efficiency

Inactive Publication Date: 2014-08-06
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the need to cool below 15°C, not only the process is complicated, but also the input and energy consumption will be greatly increased
[0011] Jinling Chemical Industry patent CN103331091A is a process for absorbing nitrogen oxides. It proposes to use dilute nitric acid plus urea to absorb part of nitrogen dioxide, and then use sodium hydroxide to

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Method for producing nitrogen oxide exhaust gas for the test: Add 5kg of carbon steel into an open plastic barrel with 10kg of 50% nitric acid to generate brown-red smoke of nitrogen oxide. On the self-developed gas treatment device, the gas flow rate of the fan is 10-20m 3 / min is adjustable, and the handheld detector shows that the concentration of nitrogen oxides is 5000mg / L. Due to the unstable flue gas concentration, the maximum concentration time period was used for the test, and new reaction raw materials were taken each time to prevent adverse effects caused by the dilution of nitric acid. The initial reaction temperature for nitrogen oxides is room temperature, about 20-25°C, and the reaction process is exothermic.

[0027] Prepare 5 tons of treatment liquid, the composition of the treatment liquid is:

[0028] 15% urea, 20mmol / L tetraethylenepentamine cobalt, temperature 60 ℃, continuous air for 2h to start.

[0029] The above-mentioned nitrogen oxide waste...

Embodiment 2

[0030] Prepare 5 tons of treatment solution, the composition is: 15% (w) urea, 30mmol / L tetraethylenepentamine cobalt, heat the treatment solution to a working temperature of 58°C, add 50kg of starter agent with a concentration of 30% hydrogen peroxide, and react for 1h.

[0031] The nitrogen oxide waste gas obtained in Example 1 first enters the reflux condenser, and the nitric acid volatilized in the waste gas is condensed into a liquid; then enters the gas-liquid separator, and the liquefied nitric acid is separated from the nitrogen oxide waste gas; The separated gas enters the bubbling absorption reaction device, and the exhaust gas containing nitrogen oxides reacts with the above-mentioned treatment liquid in the bubbling absorption reaction device. The temperature of the treatment liquid is 58°C, and the flow rate of the waste gas is 18m 3 / min; Finally, the remaining gas after being treated with the treatment liquid in the bubbling absorption reaction device enters the ...

Embodiment 3

[0033] Run continuously for 12 hours according to Example 2, and replenish desalted water every 4 hours to maintain the volume of the treatment solution. The online detection concentration at the outlet is 99mg / L, and the treatment efficiency is 98.02%.

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PUM

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Abstract

The invention relates to a treating fluid for treating nitric oxide in a waste gas, wherein the treating fluid is prepared from a reactant, a complexing catalyst and desalted water; the reactant is selected from one of ammonium hydroxide or urea or a combination of two; the complexing catalyst is formed by preparing a complexing agent or transition metal salt, wherein the complexing agent is selected from one out of or the combination of diethylenetriamine, triethylene tetramine, tetraethylenepentamine, pentaethylenehexamine or polyethyleneimine; the transition metal salt is selected from one out of or the combination of cobalt-nitrate hexahydrate (II) or cobalt chloride hexahydrate (II); the concentration of the reactant in the treating fluid is 1-20%(w%); the concentration of the complexing catalyst in the treating fluid is 1-100mmol/L. The treating fluid for treating nitric oxide in waste gas as well as the treating method which are provided by the invention are high in treating efficiency, discharge no waste fluid, and cannot generate secondary pollution; the treating method is a low-input, environment-friendly and efficient nitric oxide treating technique, and has wide popularization and application values.

Description

technical field [0001] The invention relates to a treatment liquid for treating nitrogen oxides in exhaust gas, in particular to the problem of small-scale and unitized nitrogen oxide waste gas treatment, that is, the treatment liquid for nitrogen oxides in waste gas of production units whose daily waste gas output does not exceed 500kg . Background technique [0002] The NOx in industrial waste gas is mainly nitrogen dioxide and nitric oxide, manifested as brown-yellow smog, commonly known as Huanglong, which will form nitric acid rain after being dissolved in water. Acid rain will bring extensive harm to the environment and cause huge economic losses. , such as: corroding buildings and industrial equipment; destroying open-air cultural relics and historic sites; damaging plant leaves, leading to forest demise; killing fish and shrimp in lakes; destroying soil components, reducing crop production or even death; Harmful to the human body. [0003] In addition, when NOx is ...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/86B01D53/56
Inventor 王宗廷
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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