May I ask how to calculate whether condensate is produced after toluene in exhaust gas condenses?
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May I ask how to calculate whether condensate is produced after toluene in exhaust gas condenses? Specifically: air volume is 800 m3/h at 20°C; the mass flow rate of toluene is 15 kg/h (the rest can be considered as air or nitrogen). It needs to be cooled to 10°C. What are the concentrations of toluene in the gas and liquid phases after condensation (and will any condensate be formed)? How should it be calculated?
A separator can be used; a stream of material at 20°C enters the separator at 10°C, with pressure remaining constant. After separation, the toluene concentrations in the gas and liquid phases are determined.
The simplest algorithm is to look up the saturated vapor pressure of toluene at 10 degrees Celsius, and then compare it with the partial pressure of toluene in the exhaust gas; if the partial pressure is higher, then toluene will precipitate out. Of course, the precise calculation is to determine the dew point of the exhaust gases. The above method can be used because the boiling points of toluene and nitrogen differ significantly.
It can be calculated using the flash model in Aspen; partial condensation and flashing are part of the same model.