A kind of treatment method of waste gas in the generation process of ethyl nitrite

A technology of ethyl nitrite and a treatment method, which is applied in the field of waste gas treatment in the process of ethyl nitrite generation, can solve the problems of inability to achieve absorption effect, low proportion of ethyl nitrite, harsh reaction conditions, etc. Cost reduction, environmental protection, mild reaction conditions

Active Publication Date: 2018-09-14
CHEM TECH ACAD OF SHANDONG PROVINCE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Uncondensed ethyl nitrite is usually recovered partly by secondary condensation, but it is usually difficult to recover completely due to the low proportion of ethyl nitrite in the waste gas
The inventor found through experiments that no matter whether liquid caustic or weakly acidic urea solution is used for uncondensed ethyl nitrite, it cannot achieve a good absorption effect, and the absorption rate is generally below 50%.
[0007] The application number is 201210575718.4 and the title of the invention is: a method for removing nitrite in CO coupling oxalate tail gas, which discloses the use of copper as a catalyst at a reaction temperature of 200 ° C and a reaction pressure of 0.3 MPa to remove nitrite. In addition to the reaction of ethyl nitrite, the reaction conditions are harsh and the cost input is large

Method used

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  • A kind of treatment method of waste gas in the generation process of ethyl nitrite
  • A kind of treatment method of waste gas in the generation process of ethyl nitrite
  • A kind of treatment method of waste gas in the generation process of ethyl nitrite

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Experimental program
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Effect test

Embodiment 1

[0037] 51g (0.51mol) 98% concentrated sulfuric acid and pure water are configured to form a 50% sulfuric acid solution, and the obtained sulfuric acid solution is dropped into 69.7g (1.0mol) 99% sodium nitrite aqueous solution under stirring, and the reaction temperature is controlled at 25-40°C , dripping sulfuric acid in about two hours. Pass the generated gas through the air supply bottle connected to the air pump, which is the air supply oxidation device. The reddish-brown gas after the gas supply is passed into the two-stage absorption bottle with the temperature of the absorption liquid at 40°C. The composition of the two-stage absorption liquid is 300g ( 5mol) urea+588.7g (1.5mol) 31% hydrochloric acid+5g ammonium nitrate+606.3g water is configured into 20% urea acidic solution. All waste gas is collected and analyzed by naphthalene ethylenediamine hydrochloride spectrophotometry, and the conversion rate of nitrogen oxides reaches 99.7%.

Embodiment 2

[0039] Add 75g (1mol) of ethyl nitrite into 150g of 80% ethanol aqueous solution, heat in a water bath at 35°C for 1 hour, increase the temperature of the water bath to 50°C and heat for another 1 hour, and pass the produced ethyl nitrite gas directly into the absorbing liquid without condensation It is a two-stage absorption bottle at 40°C. The two-stage absorption liquid is composed of 300g (5mol) urea + 588.7g (1.5mol) 31% hydrochloric acid + 5g ammonium nitrate + 606.3g water. The acidic solution of 20% urea is used for waste gas- Absorb in absolute ethanol at 5°C. After the reaction was completed, the dehydrated ethanol that absorbed waste gas was detected by gas chromatography, and the conversion rate of ethyl nitrite was 99.3%.

Embodiment 3

[0041] 51g (0.51mol) 98% concentrated sulfuric acid and pure water are configured into a 50% sulfuric acid solution, and the obtained sulfuric acid solution is added dropwise under stirring by 69.7g (1.0mol) 99% sodium nitrite+46.9g99% ethanol (1.01mol)+150g In the mixed solution composed of pure water, control the reaction temperature at 25-40°C, and drop the sulfuric acid in about two hours. Pass the generated gas through the -5°C refrigerant to collect most of the ethyl nitrite, then pass the uncondensed gas through the air supply bottle connected to the air pump, and the reddish-brown gas after the air supply is passed into the two-stage absorption bottle The composition of the first-grade absorption liquid is 20% urea acidic solution configured by 300g (5mol) urea + 588.7g (1.5mol) 31% hydrochloric acid + 5g ammonium nitrate + 606.3g water. The exhaust gas is first absorbed with absolute ethanol at -5°C, and all that cannot be absorbed is collected and analyzed by naphtha...

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Abstract

The invention discloses a method for treating waste gas in ethyl nitrite production process, belonging to the technical field of environmental protection. The method comprises the following steps: introducing gas flow containing ethyl nitrite and nitric oxides into absorption liquid containing urea, hydrogen ions and nitrate for reacting. According to the method disclosed by the invention, the cost of treating the produced waste gas mixed with nitric oxides and ethyl nitrite during ethyl nitrite protection is low, the reaction is mild, the concentration of the ethyl nitrite in tail gas can be greatly reduced, the environment can be effectively protected, and the method has excellent economic benefits and social benefits.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and specifically relates to a method for treating waste gas in the process of generating ethyl nitrite. Background technique [0002] Ethyl nitrite is a commonly used chemical product, often used in the synthesis of sodium azide and diethyl oxalate. The main method for producing ethyl nitrite is the ethanol-sodium nitrite-sulfuric acid method. This method has high yield and low equipment requirements, but the nitrous acid produced in the reaction cannot be completely converted, and a large amount of nitrogen oxides will be produced as a by-product during production. At the same time, the ethyl nitrite produced is difficult to be completely collected because of its low boiling point. . [0003] Nitrogen oxides refer to compounds composed only of nitrogen and oxygen. Common nitrogen oxides Nitric oxide (NO, colorless), nitrogen dioxide (NO 2 , reddish-brown), nitrous oxide (N ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/86B01D53/76B01D53/56
CPCY02C20/10
Inventor 岳涛邢文国杨旭冯维春陈琦魏凤邢伶王达彤纪晓红
Owner CHEM TECH ACAD OF SHANDONG PROVINCE
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