The concentration of toluene in the exhaust gas is 85,000 mg/m3; can it be condensed at minus 25 degrees?
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The concentration of toluene in the exhaust gas is 85,000 mg/m3; can it be condensed at minus 25 degrees?
It can be condensed. The saturated vapor pressure of toluene at -25 degrees Celsius is approximately 0.01 kPa, which is much lower than the atmospheric pressure at room temperature; therefore, under appropriate condensation conditions, toluene can be condensed from waste gases. Of course, the specific situation needs to be evaluated based on other components of the exhaust gas, humidity, and condensation equipment, among other factors. .
By using a coolant at -25°C and separating the droplets with a demister, the toluene concentration in the exhaust gas at atmospheric pressure can be reduced to around 10,000 mg/Nm3.
This post was last edited by qugd on 2023-3-29 at 15:15. Although reducing the system temperature to -25 degrees can condense most of the toluene, applying additional pressure to the medium before cooling it may yield better results and help save a significant amount of energy used for cooling. In this case, it is best to carry out calculations based on the composition and to handle the medium in a proper manner. If I’m not mistaken, this is likely a VOCs-related project; if the volume of VOCs is large, a suitable system should be installed to recover those VOCs that have value for recycling, thereby reducing VOCs emissions as well. You can refer to the process in the attachment. The location of the venturi tube can be a gas-liquid separator, which recovers the condensate back into the tank.
Hello, I’m not quite sure about this process. How does a diesel absorption tank work? What are the functions of the suction pump and the air supply pump? Also, for the activated carbon side, does hot steam come in without a condenser behind it? Could you also explain the basic principle behind the process? Thank you!
This is just an example using other VOC absorbers; it’s not related to the original question and is provided for reference only.
First, it depends on your volume of gas. If the volume is large, the cost of using the condensation method is too high, including both equipment costs and operating costs; whereas when the volume is small and the concentration is high, the condensation method can be used. The adsorption and absorption methods on the upper floor, incineration, or a combination of these methods can also be used.