Removal technology of nitrogen oxides generated in chlorobenzene thermal insulation nitration

An adiabatic nitration and nitrogen oxide technology, which is applied in the preparation of nitro compounds, the preparation of organic compounds, and organic chemistry, etc., can solve problems such as liquid phase product pollution, and achieve high material utilization, less exhaust gas emissions, and reduced operation. effect of cost

Inactive Publication Date: 2009-12-23
YANGZHOU UNIV
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  • Abstract
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Problems solved by technology

[0007] Obviously, the traditional NO x Exhaust gas treatment technologies are all aimed at x The gas is absorbed, while when NO x When the exhaust gas contains organic matter, the presence of organic pollutants will lead to the pollution of liquid phase products, so that the pollution of gas phase materials will be transformed into liquid phase pollution, and the liquid phase treatment after absorption will face new problems

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  • Removal technology of nitrogen oxides generated in chlorobenzene thermal insulation nitration

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Embodiment 1

[0029] The main process equipment is: static mixer, absorption device, gas-liquid separation equipment and flash tower, etc.

[0030] Such as figure 1 As shown, a method for removing nitrogen oxides produced in the adiabatic nitration process of chlorobenzene, the process steps are as follows:

[0031] (1) Adiabatic nitrification: In the SV-type adiabatic nitrification static mixing reactor, the mixed acid of the nitration reaction is mixed with industrial grade mass fraction of 98% sulfuric acid, 65% nitric acid and waste acid in a certain proportion. The dehydration value of the mixed acid is 2.0, the molar ratio of chlorobenzene to nitric acid is 1.1:1.0, mixing chlorobenzene and mixed acid to produce a nitration reaction, the temperature of the material after the nitration reaction is about 160°C, and the reacted material enters the next step;

[0032] (2) Reduced pressure flash evaporation: In the flash tank, the absolute operating pressure is 0.08MPa, and the material after ...

Embodiment 2

[0039] The main process equipment is: static mixer, absorption device, gas-liquid separation equipment and reduced pressure flashing equipment, etc.

[0040] Such as figure 1 As shown, a method for removing nitrogen oxides produced in the adiabatic nitration process of chlorobenzene, the process steps are as follows:

[0041] (1) Adiabatic nitrification: In the SV-type adiabatic nitrification static mixing reactor, the mixed acid of the nitration reaction is mixed with industrial grade mass fraction of 98% sulfuric acid, 65% nitric acid and waste acid in a certain proportion. The dehydration value of the mixed acid is 3.0, the molar ratio of chlorobenzene to nitric acid is 1.1:1.0, mixing chlorobenzene and mixed acid to cause a nitration reaction, the temperature of the material after the nitration reaction is about 140°C, and the reacted material enters the next step;

[0042] (2) Reduced pressure flash evaporation: In the flash cooler, at an absolute operating pressure of 0.04 M...

Embodiment 3

[0049] The main process equipment is: static mixer, absorption device, gas-liquid separation equipment and reduced pressure flashing equipment, etc.

[0050] Such as figure 1 As shown, a method for removing nitrogen oxides produced in the adiabatic nitration process of chlorobenzene, the process steps are as follows:

[0051] (1) Adiabatic nitrification: In the SV type adiabatic nitrification static mixing reactor, the mixed acid of the nitration reaction is made by mixing industrial grade mass fraction of 98% sulfuric acid, 65% nitric acid and water in a certain proportion, and the dehydration value of the mixed acid is 4.0 , The molar ratio of chlorobenzene to nitric acid is 1.05:1.0, mixing chlorobenzene and mixed acid to produce a nitration reaction, the temperature of the material after the nitration reaction is about 120°C, and the reacted material enters the next step;

[0052] (2) Vacuum flash evaporation: The absolute operating pressure in the flash tank is 0.02MPa, and t...

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Abstract

The invention relates to a removal technology of nitrogen oxides generated in chlorobenzene thermal insulation nitration, comprising the following steps of: (1) thermal insulation nitration; (2) vacuum flashing; (3) gas-liquid separation: nitrochlorobenzene crude products is further treated in liquid phase and gas-phase materials enters a next step; (4) cooling and condensation: condensed materials enter a next step; (5) gas-liquid separation: the nitrochlorobenzene and water are further treated and utilized in liquid phase, and gas-phase materials enter a next step; (6) mixed absorption: nitric acid aqueous solution and hydrogen peroxide aqueous solution absorb nitrogen oxides from exhaust gas; and (7) gas-liquid separation: the gas-phase materials are discharged after the nitrogen oxides therein achieve the standard in content, the batching of mixed acid and recycling of absorption liquid are conducted in liquid phase. The technology has the advantages of high utilization of materials, less three wastes and easy industrial implementation.

Description

Technical field [0001] The invention relates to a process for removing nitrogen oxides in exhaust gas, in particular to a process for removing nitrogen oxides produced during adiabatic nitration of chlorobenzene, and belongs to the technical fields of fine chemical technology and exhaust gas treatment. Background technique [0002] Nitrogen oxides (NO x ) Refers to a series of compounds composed of nitrogen and oxygen, including N 2 O, NO, N 2 O 3 , NO 2 , N 2 O 4 , N 2 O 5 , Usually use the molecular formula NO x To represent. Except for nitric oxide and nitrogen dioxide, other nitrogen oxides are extremely unstable, and become nitrogen dioxide and nitric oxide when exposed to light, humidity or heat, and nitric oxide becomes nitrogen dioxide again. [0003] Nitrogen oxides are very harmful to the human body, and can directly cause human respiratory tract damage. Nitrogen oxides can damage plants and even die. Under the catalysis of light, they can easily undergo complex photoch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C205/12C07C201/08C07C201/16B01D53/14
Inventor 许文林王雅琼张淮浩姚干兵张小兴陈小芹
Owner YANGZHOU UNIV
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