How to calculate the temperature at which condensation is required to reduce the methanol content in exhaust gases to the specified level
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There is a project involving exhaust gas with a flow rate of 600 m3/h, a temperature of 100 degrees, and a methanol concentration of 17 mg/L. The goal is to reduce this concentration to meet the emission standards, namely below 120 mg/m3. Condensation is planned to be used to lower the methanol concentration to the required level. How can we calculate the temperature at which the exhaust gas needs to be cooled in order to ensure that the emission levels are within acceptable limits? I searched for information but couldn’t find a method for calculation. There is a post on a forum that discusses the calculation of toluene condensation, but when I used the method described in that post to calculate the example data given, the results didn’t match. I’m not sure if the calculation method is correct; I hope everyone can **give me some advice**. Post address: https://bbs.hcbbs.com/thread-521334-1-1.html
How was it determined? Is it possible to check a table or is there a calculation method?
-75.69 mg, -85.17 mg
The most economical option is condensation at -35°C, with 4,500 mg and CO catalysis
:handshake thank you
My algorithm first calculates the partial pressure of methanol at the initial state using the ideal gas law, and then uses the Antoine equation to determine the temperature that needs to be considered. The methanol concentration in the exhaust gas at the inlet is 17.5 mg/L, and its partial pressure is 12.7165 mmHg； Using Antoine’s formula to calculate the vapor pressures of different substances at various temperatures: lgP = A – B/(t + C). Name, Molecular Formula, Temperature Range (°C): Methanol, CH4O, -20~+140; A = 7.87863, B = 1473.11, C = 230.0. The saturated temperature corresponding to a methanol partial pressure of 12.7165 mmHg is -12.54 °C℃ ； Calculations show that the exhaust gas must be cooled to -65.5°C to meet the emission requirements. Help check if there are any mistakes in the calculation approach