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Method for expelling nitrous acid alkyl ester and nitrogen oxide gas from the discharged gas

A technology of alkyl nitrite and nitrogen oxides, applied in chemical instruments and methods, separation methods, air quality improvement and other directions, to achieve the effects of reducing costs, eliminating pollution, and simple process technology

Active Publication Date: 2008-01-02
SHANGHAI HUAYI ENERGY CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is currently no method that can simultaneously treat gases containing alkyl nitrite and nitrogen oxides

Method used

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  • Method for expelling nitrous acid alkyl ester and nitrogen oxide gas from the discharged gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] According to flow chart 1, will contain CO-12.0V%, nitrogen oxide-0.5V% and CH 3 ONO-11.0V% synthesis of dimethyl oxalate reaction tail gas 40L / hr, and 121.2ml / hr of -10 ℃ methanol convective contact with the introduction from the top of the tower. The methanol solution after absorbing methyl nitrite is taken out from the bottom of the tower and returned to the main reaction system; the gas from the top of the tower passes through the bed layer equipped with a supported catalyst, and is heated at 250-300°C and the gas hourly space velocity (GHSV) is 30000-40000h -1 The catalytic reduction reaction is carried out under the following conditions, and the gas after the reaction is analyzed by gas chromatography: CO-11.0V%, nitrogen oxides-0.00V%, and the rest of the gas is N 2 . The reacted gas is discharged into the atmosphere after being burned by a torch.

Embodiment 2

[0022] According to flow chart 1, will contain CO-2.30V%, nitrogen oxide-1.0V% and CH 3 CH 2 ONO-10.0V% synthetic diethyl oxalate reaction tail gas 50L / hr, and 138ml / hr methanol convection contact at -3°C introduced from the top of the tower. The methanol solution after absorbing ethyl nitrite is taken out from the bottom of the tower and returned to the main reaction system; the gas from the top of the tower passes through the bed layer equipped with a supported catalyst, at 250~350℃, GHSV 30000~40000h -1 The catalytic reduction reaction is carried out under the following conditions, and the gas after the reaction is analyzed by gas chromatography: CO-1.3V%, nitrogen oxides-0.00V%, and the rest of the gas is N 2 . The reacted gas is discharged into the atmosphere after being burned by a torch.

Embodiment 3～8

[0024] According to flow chart 1, the tail gas of Examples 3-8 is processed, and the experimental results are shown in Table 1.

[0025] Table 1

[0026]

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PUM

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Abstract

The invention discloses a method of eliminating nitrous acid alkyl ester and nitrogen oxide gas in discharged gas, comprising following procedures. a. discharged gas is sent into the recovery tower of nitrous acid alkyl ester and alkyl alcohol is used to adsorb nitrous acid alkyl ester in discharged gas so as to obtain alkyl alcohol solution of nitrous acid alkyl ester. b. discharged gas treated by the procedure a is sent into catalytic reduction reactor so that not-adsorbed nitrous acid alkyl ester and nitrogen oxide gas are reacted with reduction gas to form N2 under the action of load catalyst; the temperature for catalytic reduction reaction is controlled in 200-600deg.C and the pressure is controlled in 0.05MPa-1MPa; the cubage proportion of reduction gas and nitrogen oxide gas is more than 1:1. The invention not only adsorbs and recovers nitrous acid alkyl ester but also transforms nitrogen oxide gas in to nitrogen by catalytic reduction reaction. The total concentration of nitrogen oxide gas and nitrous acid alkyl ester in treated discharged gas is lower than 200ppm.

Description

technical field [0001] The invention relates to a method for removing alkyl nitrite and nitrogen oxide gas from exhaust gases such as industrial waste gas or chemical reaction tail gas. Background technique [0002] Exhaust gases such as industrial waste gas or chemical reaction exhaust gas often contain toxic and harmful gases such as alkyl nitrite and nitrogen oxide gas. For example, in the process of preparing dialkyl oxalate by gas-phase method of carbon monoxide, the exhaust gas contains a certain concentration of alkyl nitrite and nitrogen oxide gas, and these exhaust gases containing alkyl nitrite and nitrogen oxide Directly entering the atmosphere will pollute the environment and bring harm to human health. Therefore, it is necessary to remove the alkyl nitrite and nitrogen oxides in the above-mentioned exhaust gas, so that the alkyl nitrite in the polluted gas can be eliminated. The total content of esters and nitrogen oxides is at or below the allowable discharge ...

Claims

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Application Information

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IPC IPC(8): B01D53/18B01D53/84B01D53/56B01D53/72
CPCY02A50/20
Inventor 肖招金黄飚鲁文质吴良泉
Owner SHANGHAI HUAYI ENERGY CHEM
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