CN102814056A - Treating method for tail gas containing nitrogen dioxide - Google Patents
Treating method for tail gas containing nitrogen dioxide Download PDFInfo
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- CN102814056A CN102814056A CN2012102592917A CN201210259291A CN102814056A CN 102814056 A CN102814056 A CN 102814056A CN 2012102592917 A CN2012102592917 A CN 2012102592917A CN 201210259291 A CN201210259291 A CN 201210259291A CN 102814056 A CN102814056 A CN 102814056A
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- tail gas
- nitrogen dioxide
- treatment step
- processing method
- contains nitrogen
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Abstract
The invention discloses a treating method for tail gas containing nitrogen dioxide. The method comprises a step of absorbing tail gas condensate with alkali liquor and a pretreatment step of absorbing the tail gas condensate with water, wherein the pretreatment step is carried out under a negative pressure of 0.02 to 0.045 MPa. According to the invention, nitric acid can be obtained through the pretreatment step; therefore, the tail gas is recycled, the usage amount of the alkali liquor in the process of treating is reduced, treating cost is decreased, no nitrogen oxide gas is discharged in the process of treating, and environmental pollution is reduced.
Description
Technical field
The invention belongs to the tail gas recycle process field in the chemical industry, be specifically related to a kind of processing method that contains nitrogen dioxide tail gas.
Background technology
All can produce nitrogen dioxide gas in the building-up process of a lot of industrial chemicals; Will produce a large amount of nitrogen dioxide gas in the process like Synthetic 2-methyl-5-nitro imidazoles; And 2-methyl-5-nitro imidazoles is a metronidazole in the medicine. Tinidazole. and the key intermediate of bulk drugs such as Ornidazole, these bulk drug purposes are wide, good effect; Output is big, has crucial meaning so carry out the tail gas recycle work of treatment.
Is to adopt the method that directly absorbs with alkali lye after the tail gas condensation at present, absorbs the sodium nitrate that the back produces and send effluent treatment plant to handle the processing majority that contains nitrogen dioxide tail gas, this method exist shortcoming have: 1, assimilation effect is bad, and 40% NO only has an appointment
2Be absorbed, do not have absorbed NO
2Gas can cause very big pollution to environment.2, the alkali lye consumption is big, and processing cost is very high.
Summary of the invention
The objective of the invention is defective, a kind of processing method that contains nitrogen dioxide tail gas is provided to prior art.
The present invention realizes through following technical scheme:
A kind of processing method that contains nitrogen dioxide tail gas comprises the step of tail gas condensate liquid with the alkali lye absorption, also comprises the pre-treatment step that tail gas condensate liquid water is absorbed.
Said pre-treatment step is under the condition of negative pressure of 0.02-0.045MPA, to carry out.
Said pre-treatment step is carried out in 1-3 level spray column.
Preferably, said pre-treatment step is carried out in 2 grades of spray columns.
Be provided with the 6-9 layer in the said spray column and fill the screen of Pall ring filler.
The invention has the beneficial effects as follows:
1, can obtain nitric acid through the pre-treatment step that tail gas condensate liquid water is absorbed, and nitric acid is raw material extremely commonly used in the chemical industry, thereby has realized the recycling of tail gas.
2, the nitrogen dioxide absorptivity in the pre-treatment step of the present invention is high, can reach more than 90%, remainingly absorbs with alkali lye less than 10% part again, thereby has reduced the consumption of alkali lye, has reduced processing cost.
3, almost do not have the oxides of nitrogen gas discharging, reduced environmental pollution.
Description of drawings
Fig. 1 is an apparatus and process flow chart of the present invention.Among the figure: 1-agitated reactor, 2-condenser, 3-one-level spray column, 4-secondary spray column, 5-alkali lye absorption tower, 6, the 7-hydraulic pump, 8-air-introduced machine.
Fig. 2 is the structural representation of spray column of the present invention.Among the figure: 9-feed pipe, 10-discharge nozzle, 11-air inlet pipe, 12-escape pipe, 13-shower nozzle, 14-screen.
The specific embodiment
A kind of processing method that contains nitrogen dioxide tail gas comprises the step of tail gas condensate liquid with the alkali lye absorption, also comprises the pre-treatment step that tail gas condensate liquid water is absorbed.Said pre-treatment step is under the condition of negative pressure of 0.02MPA, in spray column, carries out.
The reaction equation of pre-treatment step is following:
3NO
2+H
2O=2HNO
3+NO↑
2/3 NO in the reaction
2Be converted into HNO
3, remaining 1/3NO
2Be converted into NO, therefore need to generate NO with oxygen reaction again
2, could continue to be absorbed by water.Negative pressure in the present embodiment is exactly in order in reaction, to mend an amount of air, to make the abundant and oxygen reaction generation NO of NO ability
2Negative pressure also has the effect that the tail gas condensate liquid is sucked spray column simultaneously.
Embodiment 2
A kind of processing method that contains nitrogen dioxide tail gas comprises the step of tail gas condensate liquid with the alkali lye absorption, also comprises the pre-treatment step that tail gas condensate liquid water is absorbed.Said pre-treatment step is under the condition of negative pressure of 0.045MPA, in 3 grades of spray columns, carries out.
Through increasing the progression of spray column, can the tail gas condensate liquid be absorbed the concentration that improves nitric acid through repeatedly circulating, increase the absorptivity of nitrogen dioxide simultaneously, avoid producing nitrogen dioxide waste gas.
A kind of processing method that contains nitrogen dioxide tail gas comprises the step of tail gas condensate liquid with the alkali lye absorption, also comprises the pre-treatment step that tail gas condensate liquid water is absorbed.Said pre-treatment step is under the condition of negative pressure of 0.03MPA, in 2 grades of spray columns, carries out, and is provided with 6 layers of screen in the said spray column.
As depicted in figs. 1 and 2; The tail gas that produces in the agitated reactor 1 is condensed into liquid in condenser 2; Under action of negative pressure, be attracted to one-level spray column 3 then; Condensate liquid gets into spray column 3 through feed pipe 9, contacts from shower nozzle 13 ejections and with spray column 3 interior water, and nitrogen dioxide and water react and is absorbed.Be not absorbed completely nitrogen dioxide and get into secondary spray column 4 and continue to be absorbed by water, after getting into alkali lye absorption tower 5 at last and being absorbed by alkali lye, the equipment emptying, the alkali lye of absorbing waste gas send the cleaning shop to handle.
Said screen 14 is used to carry filler, and screen 14 and filler constitute the passage of gas and liquid together, and said filler is the Pall ring filler; Specification is ￠ 50*3*50, and it is big that this filler has a flux, and resistance is little; Advantages such as separative efficiency height and operating flexibility are big, under identical step-down, the comparable Raschig ring of treating capacity is big more than 50%; When same treating capacity, step-down can reduce half the, and mass-transfer efficiency can improve about 20%.
Claims (5)
1. a processing method that contains nitrogen dioxide tail gas comprises the step of tail gas condensate liquid with the alkali lye absorption, it is characterized in that also comprising the pre-treatment step that tail gas condensate liquid water is absorbed.
2. the processing method that contains nitrogen dioxide tail gas as claimed in claim 1 is characterized in that said pre-treatment step is under the condition of negative pressure of 0.02-0.045MPA, to carry out.
3. according to claim 1 or claim 2 the processing method that contains nitrogen dioxide tail gas is characterized in that said pre-treatment step carries out in 1-3 level spray column.
4. the processing method that contains nitrogen dioxide tail gas as claimed in claim 3 is characterized in that said pre-treatment step carries out in 2 grades of spray columns.
5. the processing method that contains nitrogen dioxide tail gas as claimed in claim 3 is characterized in that being provided with in the said spray column screen that the 6-9 layer is filled the Pall ring filler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102592917A CN102814056A (en) | 2012-10-12 | 2012-10-12 | Treating method for tail gas containing nitrogen dioxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102592917A CN102814056A (en) | 2012-10-12 | 2012-10-12 | Treating method for tail gas containing nitrogen dioxide |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102814056A true CN102814056A (en) | 2012-12-12 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012102592917A Pending CN102814056A (en) | 2012-10-12 | 2012-10-12 | Treating method for tail gas containing nitrogen dioxide |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104555945A (en) * | 2015-01-08 | 2015-04-29 | 广西大学 | Production process of sulphuric acid |
| CN104555954A (en) * | 2013-10-12 | 2015-04-29 | 丹阳恒安化学科技研究所有限公司 | Production technology of nitric acid |
| CN109264788A (en) * | 2018-11-15 | 2019-01-25 | 湖北省宏源药业科技股份有限公司 | A kind of preparation facilities and method of ferric nitrate |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101590355A (en) * | 2008-05-30 | 2009-12-02 | 河南新天地药业有限公司 | Technology for absorbing tail gas of glyoxalic acid production |
| CN101914062A (en) * | 2010-09-01 | 2010-12-15 | 中南民族大学 | Method for recovering metronidazole finished product from industrial waste residue of metronidazole |
| WO2011043945A1 (en) * | 2009-10-05 | 2011-04-14 | Massachusetts Institute Of Technology | Water separation under varied pressure |
-
2012
- 2012-10-12 CN CN2012102592917A patent/CN102814056A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101590355A (en) * | 2008-05-30 | 2009-12-02 | 河南新天地药业有限公司 | Technology for absorbing tail gas of glyoxalic acid production |
| WO2011043945A1 (en) * | 2009-10-05 | 2011-04-14 | Massachusetts Institute Of Technology | Water separation under varied pressure |
| CN101914062A (en) * | 2010-09-01 | 2010-12-15 | 中南民族大学 | Method for recovering metronidazole finished product from industrial waste residue of metronidazole |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104555954A (en) * | 2013-10-12 | 2015-04-29 | 丹阳恒安化学科技研究所有限公司 | Production technology of nitric acid |
| CN104555945A (en) * | 2015-01-08 | 2015-04-29 | 广西大学 | Production process of sulphuric acid |
| CN109264788A (en) * | 2018-11-15 | 2019-01-25 | 湖北省宏源药业科技股份有限公司 | A kind of preparation facilities and method of ferric nitrate |
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Application publication date: 20121212 |