Nitrogen oxide absorption device and method for realizing separation of absorption products by using device

An absorption device, a technology of nitrogen oxides, applied in the direction of separation methods, nitrogen oxides/oxyacids, chemical instruments and methods, etc., can solve difficult separation and purification problems, and achieve the effects of easy separation, simple structure, and easy operation

Active Publication Date: 2018-08-10
XILONG SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This new type of absorbent for removing NOx from exhaust gases can be made up by two parts: one part uses an expensive chemical called ammonia or urea that helps remove harmful substances like carbon monoxide (CO) while another part makes sure it's safe enough to handle other things without damaging them too much.

Problems solved by technology

Technological Problem addressed in this patents relating to producing different types of chemical compounds from NO2/NH, called nitrosamines, including nitronitrile and nitrocottonic acids, involves generating large amounts of harmful pollutants during manufacturing processes. These emissions pose environmental concerns and require proper disposal techniques. Current treatments involve expensive physical separation procedures like vacuum distillation or liquid extraction.

Method used

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  • Nitrogen oxide absorption device and method for realizing separation of absorption products by using device

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1), the NO generated in the previous process X Enter the absorption towers 1, 2, and 3 in turn through negative pressure diversion, and absorb with 25% sodium hydroxide solution. When the pH value of the lye in a certain absorption tower drops to 11, the lye in the tower is pumped out. The liquid is a mixed salt solution, which contains 21% sodium nitrate, 16.5% sodium nitrite, and 1.2% sodium carbonate after testing, and the absorption tower is replaced with a new 25% sodium hydroxide solution;

[0025] (2) Pump 1500L of the mixed salt solution in step (1) into reaction kettle A, control the temperature below 30°C under stirring, open the liquid outlet of high-level storage tank 4, and let the nitric acid with a mass concentration of 25% flow from the mixed Slowly add under the liquid level of the solution until the solution pH=5.5, stop adding acid, and control the speed of acid addition so that there is no overflow of nitrogen oxides on the liquid surface, and the g...

Embodiment 2

[0030] (1), the NO generated in the previous process X Enter absorption towers 1, 2, and 3 sequentially through negative pressure diversion, and absorb with 20% sodium hydroxide solution. The liquid is a mixed salt solution, which contains 18% sodium nitrate, 13% sodium nitrite, and 1% sodium carbonate after testing, and the absorption tower is replaced with a new 20% sodium hydroxide solution;

[0031] (2) Pump 1500L of the mixed salt solution in step (1) into the reaction kettle A, control the temperature below 30°C under stirring, open the liquid outlet of the high-level storage tank 4, and let the nitric acid with a mass concentration of 20% flow from the mixed Slowly add under the liquid level of the solution until the pH of the solution is 5, stop adding acid, and control the speed of adding acid so that there is no overflow of nitrogen oxides on the liquid surface, and the generated CO 2 Discharge through the induced draft fan at the top of the reactor A;

[0032] (3)...

Embodiment 3

[0036] (1), the NO generated in the previous process X Enter the absorption towers 1, 2, and 3 in turn through negative pressure diversion, and absorb with 30% sodium hydroxide solution. When the pH value of the lye in a certain absorption tower drops to 11, the lye in the tower is pumped out. The liquid is a mixed salt solution, which contains 25% sodium nitrate, 19% sodium nitrite, and 1.3% sodium carbonate after testing, and the absorption tower is replaced with a new 30% sodium hydroxide solution;

[0037] (2) Pump 1500L of the mixed salt solution in step (1) into reaction kettle A, control the temperature below 30°C under stirring, open the liquid outlet of high-level storage tank 4, and let the nitric acid with a mass concentration of 30% flow from the mixed Slowly add the solution under the liquid level until the pH of the solution is 6, stop adding acid, and control the speed of adding acid so that there is no overflow of nitrogen oxides on the liquid level, and the ge...

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PUM

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Abstract

The invention provides a nitrogen oxide absorption device. The device comprises a washing unit and a reaction unit, wherein the washing unit comprises a plurality of absorption towers which are connected in series; each absorption tower is an absorption tower adopting alkali liquid circulation; the reaction unit comprises a reaction kettle A and a reaction kettle B; a filler absorption tower is arranged at the top of the reaction kettle B; the top of the filler absorption tower is connected with a liquid outlet of an injection pump; a vacuum chamber of the injection pump is connected to the top of the reaction kettle A; two nitric acid high-level storage tanks and a waste gas discharging opening connected with an induced draft fan are further arranged at the top of the reaction kettle A; acirculating pump is connected between the bottom of the reaction kettle B and a liquid inlet of the injection pump. The invention further provides a method for realizing separation of absorption products including sodium nitrate and sodium nitrite by utilizing the absorption device. According to the method provided by the invention, nitrogen oxide is firstly introduced into the absorption towersand is absorbed by alkali liquid to be converted into mixed salt; then nitric acid with different concentrations is added into the mixed salt, the pH (Potential of Hydrogen) value of a reaction solution is controlled and then the sodium nitrate and the sodium nitrite are obtained. The method provided by the invention can really realize clean recycling of the nitrogen oxide.

Description

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Claims

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Application Information

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Owner XILONG SCI CO LTD
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