Treatment methods for xylene and butylene
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The spray paint exhaust gas has gone through the water curtain paint mist removal process, the air volume is 20000m3/h, the organic matter is xylene and butylene, and the total content is 300mg/m3. What method should be used to control it? Which method is better? Give reasons.
1. Set up a spray booth to reduce the air volume. 2. Use an activated carbon filter device for purification. 3. The water curtain paint mist removal process is only a pretreatment, which can reduce the subsequent load, and sometimes it is not necessary.
They are all toxic organic matter. It is of course good to use activated carbon to adsorb them, and an activated carbon regeneration device is required. The waste gas can be directly incinerated to remove organic matter.
Biological filtration can be used, which has low operating costs. The combustion method consumes too much energy.
I have a plan now which is adsorption-desorption catalytic combustion. I don’t know if this is good or not.
You can send us your plan and take a look! We did a recycling program for spray paint exhaust gas in September last year, but due to the economic crisis, their production dropped significantly and was shelved. It is adsorption concentration + catalytic combustion! You can communicate! This post was last edited by bamboo0125 on 2009-3-8 11:16 ]
It is impossible to burn directly. Set up an adsorbent (the cheapest is activated carbon) in the air duct and regenerate it after a period of time. The simple way is to heat and desorb, and then dispose of the organic components through catalytic combustion.
Content source network, author unknown. 1. Activated carbon. At present, the simple physical adsorption method of activated carbon is mostly used. This method is quick in the short term, low cost, and has certain results. However, as time passes, the pollutant gas molecules adsorbed on the surface of the activated carbon are no longer adsorbed due to the saturation of the activated carbon, and are blown around by the wind, forming secondary pollution. If activated carbon is replaced frequently, the cost of use will be higher. 2. Photocatalyst. Photocatalyst is relatively advanced in theory. However, photocatalysts are related to reaction conditions, catalyst morphology, specific surface area, and electron and hole separation efficiency. For example, the larger the contact specific surface area, the larger the light-receiving surface, the more electron holes formed, and the higher the photocatalytic efficiency. However, due to the influence of technology, the diameter of almost all photocatalysts now is above 10um and cannot be truly nanoscale. The microporous zeolite catalyst introduced in the Hitachi EP-V32 air purifier developed by Hitachi in August 2005 is one-200th of the previous photocatalyst in diameter, resulting in an increase in the specific surface area. Beyond photocatalyst products. In actual industry, air pollution has strong odor, complex components and high technical requirements, which far exceeds that of civilian equipment. Therefore, photocatalysts can only exist in theory at present. The application in industry is still completely blank, and no such successful case can be found. 3. Electrostatic dust collection method. Electrostatic dust collection is a mature process. It is widely used in industrial dust control and is also widely used in central air conditioning. It has the advantages of high dust removal efficiency and large purification gas volume. However, it is not suitable for dust gases with high concentration and strong odor. The investment cost is high and high-voltage power transformation and rectification control equipment are required. 4. Ozone method. Ozone method is one of the known air purification methods with strong oxidizing properties. High purification efficiency. However, because ozone can cause cancer and is residual, it is very harmful to the human body, so it is impossible to have a human and a machine in the same room. If we want to fundamentally control the environmental and health impacts of synthetic leather organic pollution exhaust gases, we must start with a comprehensive replacement of solvents. Use new, slightly toxic or non-toxic aliphatic solvents without benzene ring structures to replace the currently used toluene, DMF, butyl and other highly toxic mixed solvents and take corresponding supporting prevention and control measures.
The thermal storage incineration method can be used, which saves investment. If the exhaust gas concentration reaches 500ppm, there is basically no operating cost and the emissions can meet the standards. If you have any needs, please contact qntgx@sohu.com