Method for simultaneously removing nitrous oxide and nitric oxide in exhaust gas of chemical plant by utilizing catalyst

A technology of nitrous oxide and nitric oxide, which is applied in the fields of nitrous oxide capture, chemical instruments and methods, separation methods, etc., to achieve the effects of simplifying the process, reducing operating costs, and simplifying the waste gas treatment process

Inactive Publication Date: 2015-08-19
KOREA INST OF ENERGY RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when ammonia is used as a reducing agent, the catalyst used in the above-mentioned patent requires a high temperature of 360° C. or higher in order to reduce nitrous oxide alone.
[0012] In addition, when ammonia is used as a reducing agent, the technology used in the above-mentioned conventional patent documents needs to be at a high temperature of 400° C. or higher in order to effectively offset nitric oxide and nitrous oxide simultaneously

Method used

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  • Method for simultaneously removing nitrous oxide and nitric oxide in exhaust gas of chemical plant by utilizing catalyst
  • Method for simultaneously removing nitrous oxide and nitric oxide in exhaust gas of chemical plant by utilizing catalyst
  • Method for simultaneously removing nitrous oxide and nitric oxide in exhaust gas of chemical plant by utilizing catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] to Al 2 o 3 / SiO 2 After heating 8 g of BEA zeolite with a molar ratio of 25 to 500°C while supplying 1 liter / min (liter / min) of nitrogen, deionized distilled water was passed through a syringe pump at a flow rate of 0.5 ml / min Serve for 1 hour. After supplying distilled water, the temperature was cooled to normal temperature in the same flow rate of nitrogen to prepare a water-treated BEA zeolite (A).

[0051] Iron ion solution (B) is made by adding 1.6g iron nitrate hydrate (Fe(NO 3 ) 3 9H 2 O) Prepare by dissolving in 1 liter of deionized distilled water. Disperse 8 g of BEA zeolite (A) which has been treated with moisture in 1 liter of iron ion solution (B) prepared and stir at a temperature of 21 for 24 hours. A zeolite filter cake impregnated with iron ions was obtained by filtration of the stirred zeolite slurry, where the filter cake was washed with 1 liter of deionized distilled water. The washed filter cake was dried in air at a temperature of 105° C. ...

Embodiment 2

[0057] In order to compare the basic properties of the catalysts produced in the [Example 1] and [Comparative Example], 0.4 g of different catalysts produced were placed in the center of a 1 / 2" stainless steel tube reactor. The temperature of the reactor was raised from room temperature to 500°C at a rate of 4 / min using an electric furnace.

[0058] Nitrous oxide was supplied at a concentration of 400 ppm, and 400 ppm of ammonia reducing agent was used. The oxygen concentration in the reaction gas was adjusted to 3,000 ppm. The total flow of reaction gas was fixed at 0.4 l / min with nitrogen and the space velocity (GHSV) was maintained at 20,000 hr -1 . After the reaction, in order to analyze the components of the gas, an online gas analyzer (SIEMENS) was used for the concentration of nitrous oxide, and the results are shown in the following table.

[0059]

[0060][Example 1] and [Comparative Example] The nitrous oxide conversion rates of the catalysts produced at a reac...

Embodiment 3

[0072] In order to confirm the efficiency of removing nitrous oxide and nitrogen monoxide using the catalyst of the present invention in the waste gas generated in the actual production plant, the waste gas of the nitric acid production plant was used as the raw material gas, and the iron ion impregnated by the present invention Zeolite reactors were used to observe the removal efficiency of nitrous oxide and nitric oxide.

[0073] The zeolite impregnated with iron ions used in this example was produced by the same method as in the above [Example 1]. In order to achieve ion exchange of a sufficient amount of Fe ions and impregnate the zeolite, a total of three times of ion exchange were performed. Impregnation and filtration, washing, drying process. Finally, the dried catalyst was calcined in an atmosphere of 500 for 4 hours.

[0074] Generally, the composition of the exhaust gas emitted from the nitric acid production process is known to be about [NO] hundreds of ppm, [N 2...

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Abstract

The invention relates to a method for simultaneously removing nitrous oxide and nitric oxide in the exhaust gas of a chemical plant by utilizing a catalyst. According to the method, a zeolite catalyst, infiltrated in iron ions, is put in a catalytic reactor. Inside the catalytic reactor, the ammonia is adopted as a reducing agent, and the operation conditions supplied from the catalytic reactor to the exhaust gas is controlled. In this way, during the generation process of nitric acid, adipic acid, caprolactam and the like, nitrous oxide and nitric oxide can be generated out of the exhaust gas of the chemical plant at the same time at a low reaction temperature of 300-400 DEG C.

Description

technical field [0001] The present invention relates to a catalytic reactor comprising a zeolite catalyst impregnated with iron ions to simultaneously offset A process for nitrous oxide and nitric oxide that can replace existing catalytic processes using ammonia reducing agents that require high reaction temperatures above 400°C, and for the removal of monoxide by separate processes Dinitrogen and nitric oxide related processes are integrated to enable simultaneous removal of N under operating conditions of approximately 350°C and under NOx offsetting operating conditions using an ammonia reducing agent 2 O. [0002] The zeolite catalyst impregnated with iron ions used in the present invention is produced through the following steps: a moisture pretreatment step in which the zeolite is subjected to moisture pretreatment by supplying water vapor for 0.1 to 2 hours in a nitrogen atmosphere; and a step of impregnating iron ions , wherein iron nitrate hydrate (Fe(NO 3 ) 3 9H ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/90B01D53/56
CPCY02C20/10Y02P20/30B01D53/56B01D53/86B01D53/90
Inventor 全相九李承宰柳寅洙文胜铉
Owner KOREA INST OF ENERGY RES
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