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Method for processing tail gas produced by nitric acid

A technology for tail gas treatment and nitric acid, which is applied in separation methods, chemical instruments and methods, and air quality improvement, etc., can solve the problems of low mass transfer efficiency of gas and microbial culture liquid, low processing efficiency, and complicated process, and achieves the improvement of light energy. The effect of utilization, promoting accumulation, and improving mass transfer efficiency

Inactive Publication Date: 2016-02-03
TIANJIN CITY PO MOIST CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] The present invention aims at the technical defects of the prior art, and provides a method for treating tail gas from nitric acid production, so as to solve the technical problems of the prior art such as complex process, low processing efficiency and high cost
[0019] Another technical problem to be solved by the present invention is that in the method of the present invention, the mass transfer efficiency of gas and microbial culture solution is relatively low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A method for treating tail gas from nitric acid production, comprising the following steps:

[0039] 1) Cool the tail gas to 25°C, and then use a gas pump to transfer the tail gas at a cell density of 3×10 with a ratio of 1:50 between the total volume of the tail gas and the total volume of the paracoccus culture solution. 8 cfu / ml paracoccus culture solution circulated for 10 hours to obtain a filtered tail gas;

[0040] 2) Then with the ratio of the total volume of the first filter tail gas to the total volume of the chlorella culture solution of 1:100, use a gas pump to transfer the first filter tail gas described in step 1) at a cell density of 10 7 Circulate in the chlorella culture solution of cfu / ml for 5h to obtain the tail gas of the second filter;

[0041] 3) Then the second filter tail gas is passed through a pipeline with a length of 10m and water is installed to obtain the third filter tail gas;

[0042] 4) The tail gas of the third filter is passed throu...

Embodiment 2

[0050] A method for treating tail gas from nitric acid production, comprising the following steps:

[0051] 1) Cool the tail gas to 35°C, and then use a gas pump to cool the tail gas at a cell density of 10 with a ratio of 1:70 between the total volume of the tail gas and the total volume of the paracoccus culture solution. 9 cfu / ml paracoccus culture solution circulated for 12 hours to obtain a filtered tail gas;

[0052] 2) Then, with the ratio of the total volume of the first filter tail gas to the total volume of the chlorella culture solution of 1:120, use a gas pump to transfer the first filter tail gas described in step 1) at a cell density of 8×10 7 cfu / ml of chlorella culture solution circulated for 7 hours to obtain the second filter tail gas;

[0053] 3) Then the second filter tail gas is passed through the pipeline with a length of 12m and water is installed to obtain the third filter tail gas;

[0054] 4) Pass the exhaust gas from the third filter through a pipe...

Embodiment 3

[0060] A method for treating tail gas from nitric acid production, comprising the following steps:

[0061] 1) Cool the tail gas to 30°C, and then use a gas pump to transfer the tail gas at a cell density of 7×10 with a ratio of 1:60 between the total volume of the tail gas and the total volume of the paracoccus culture solution. 8 cfu / ml paracoccus culture solution circulated for 11 hours to obtain a filtered tail gas;

[0062] 2) Then, with the ratio of the total volume of the first filter tail gas to the total volume of the chlorella culture solution of 1:110, use a gas pump to transfer the first filter tail gas described in step 1) to a cell density of 4×10 7 Circulate in the chlorella culture solution of cfu / ml for 6 hours to obtain the tail gas of the second filter;

[0063] 3) Then the second filter tail gas is passed through a pipeline with a length of 11m and water is installed to obtain the third filter tail gas;

[0064] 4) Pass the exhaust gas of the third filter...

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Abstract

The invention provides a method for processing tail gas produced by nitric acid. The method comprises the following steps: adjusting temperature of tail gas to a suitable scope between 25 and 35 DEG C for microbe growth, introducing the tail gas in a paracoccus nutrient solution, using denitrification of the paracoccus for reducing nitrate, nitrite and a nitrogen oxide in the tail gas to nitrogen, introducing the tail gas into a chlorella nutrient solution, using photosynthesis of chlorella for absorption and fixing of carbon dioxide, absorbing residual nitrogen oxide, and taking the residual nitrogen oxide as a nitrogen source for algae growth, wherein gas from two-step biological treatment is mixed with partial microbe spittle, so that the method connects water pipes in series and the microbe in gas can be diluted and absorbed with a certain degree, and finally discharging the gas to atmosphere after water absorption by calcium chloride. The biological treatment method has the advantages of cleaning and environmental protection, and is capable of processing exhaust gas and promoting thalline growth, the obtained paracoccus can be used as a feed, the chlorella can be used for processing biodiesel, and has prominent economic value.

Description

technical field [0001] The invention relates to the technical field of industrial waste gas treatment, in particular to a method for treating tail gas from nitric acid production. Background technique [0002] Nitric acid is one of the most important inorganic acids in industry, and its current annual output is second only to sulfuric acid. Before the 20th century, the method of producing nitric acid was to heat concentrated sulfuric acid with sodium nitrate or potassium nitrate. This method is limited by the source of raw materials, and has been gradually eliminated in industry since the beginning of this century. The nitric acid production method commonly used today is the catalytic oxidation of ammonia invented by German Ostwald at the beginning of this century. When using this method to produce nitric acid, the tail gas from the absorption tower contains a small amount of unabsorbed nitrogen oxide gas (mainly NO and NO 2 ). If they are discharged into the atmosphere ...

Claims

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Application Information

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IPC IPC(8): B01D53/84
CPCY02A50/20
Inventor 孙世全
Owner TIANJIN CITY PO MOIST CHEM
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