What to do when data on relative volatility cannot be found
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Regarding the calculation of distillation column trays, what should be done when no data is available for the relative volatility? Experts, please share your experience
Relative volatility can be calculated using saturated vapor pressures; you can check the principles of chemical engineering for more details
One can only calculate it by oneself; first choose a thermodynamic method to compute the phase equilibrium constant.
Reply to 2# kzb7054: Where can one find information on saturated vapor pressure? There are quite comprehensive sources available
The relative volatility cannot be found; it can be calculated using the definitions of relative volatility and volatility! The saturated vapor pressure can be found in chemical data sheets and is also available online.
For an ideal gas, the relative volatility is equal to the ratio of the saturated vapor pressures of the two pure components at the same temperature.
An ideal gas is simply the ratio of saturated vapor pressures; for different components, their αm values are calculated at various temperatures. y = (αm / (1 + (αm – 1) * x)). Once the value of component y is known, x can be calculated
An ideal gas is simply the ratio of saturated vapor pressures; for different components, their αm values are calculated at various temperatures. y = (αm / (1 + (αm – 1) * x)). Once the value of component y is known, x can be calculated
Reply to 8# Vieff: What if it’s not an ideal gas?
Reply to 6# lshx888: I agree with the view expressed on floor 6; the saturated vapor pressure can be found