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Catalytic oxidation process for treating tail gas from absorption tower of acrylonitrile installation

A catalytic oxidation and treatment process technology, applied in the chemical industry, organic chemistry, climate sustainability, etc., can solve the problems of high operating costs, large incineration exhaust, large fuel, etc., to achieve a wide operating range and thorough tail gas treatment , long service life effect

Inactive Publication Date: 2007-01-31
SHANGHAI DONGHUA ENVIRONMENT ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the low concentration of organic matter and high toxicity in the tail gas of the absorption tower of the acrylonitrile plant, the general tail gas treatment process cannot meet the environmental protection requirements.
[0003] At present, the tail gas of the absorption tower of the acrylonitrile plant is generally discharged directly from the high point of the chimney, which causes serious pollution to the environment.
[0004] In addition, some acrylonitrile plants use thermal incineration to treat acrylonitrile tail gas, but the disadvantage of thermal incineration is that it consumes a lot of fuel, the operating cost is high, and the incineration exhaust gas is large, and there will be a small amount of NO in the incineration process. x produce

Method used

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  • Catalytic oxidation process for treating tail gas from absorption tower of acrylonitrile installation
  • Catalytic oxidation process for treating tail gas from absorption tower of acrylonitrile installation

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Embodiment Construction

[0020] The process of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0021] Such as figure 1 and 2 As shown, the first embodiment of the present invention provides a catalytic oxidation treatment process for the tail gas of the absorption tower of an acrylonitrile plant.

[0022] In the start-up stage, after the fuel gas and air are mixed, they are heated to the ignition temperature of the catalyst by the electric heater or steam heater 1, and then enter the catalytic reactor 2 for catalytic oxidation reaction. Gradually switch the tail gas of the absorption tower into the catalytic reactor 2, switch the fuel out of the catalytic reactor 2, fix the honeycomb ceramic catalyst on the catalyst fixed bed 15, and keep the internal pressure of the catalytic reactor 2 at about 7.5kPa and the temperature at about 400°C , the above-mentioned absorption tower tail gas and air or oxygen carry out catalytic oxidatio...

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Abstract

A process for treating the acrylonitrile contained waste gas exhausted by the acrylonitrile apparatus includes such steps as mixing said waste gas with air, heating, catalytic oxidizing reaction to decompose the harmful volatile organic substance to CO2 and H2O, recovering heat and exhausting.

Description

technical field [0001] The invention relates to a catalytic oxidation treatment process of absorbing tower tail gas in the process of industrial production of acrylonitrile. Background technique [0002] The acrylonitrile plant using propylene ammoxidation technology uses propylene, ammonia, and air as the main raw materials. Under the action of a catalyst, it reacts to produce acrylonitrile and other by-products, and then undergoes processes such as quenching, recycling, and refining to obtain acrylonitrile products. In the production process of acrylonitrile, a stream of gas is discharged from the top of the absorption tower, which is called the absorption tower off-gas (AOG). The main components of the tail gas are nitrogen, water vapor and carbon dioxide, and also contain a certain amount of carbon monoxide, acrylonitrile, propylene and propane and other harmful components that pollute the environment. Due to the low concentration of organic matter and high toxicity in ...

Claims

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Application Information

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IPC IPC(8): B01D53/86C07C253/34C07C255/08
CPCY02P20/151Y02P20/50
Inventor 赵小平吴利军
Owner SHANGHAI DONGHUA ENVIRONMENT ENG
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