Vapor phase concentration
Vapor phase concentration
(OP)
Is raoults law valid for very low concentration of solute in aqueous solutions?
I have 9000 ppm (w) of Acetone in Water and I am trying to determine vapor phase concentration of Acetone at 120F and 760 mmHg.
So I converted in to mole fractions ( Xac: 0.00046 and Xwater: 0.9996) With pure vapor pressures of Acetone and water at 120F, I calculated partial vapor pressures of each component.
From my calcs, partial vapor pressure of water is higher than that of Acetone which didn't make sense.
Please help.
Thanks.
I have 9000 ppm (w) of Acetone in Water and I am trying to determine vapor phase concentration of Acetone at 120F and 760 mmHg.
So I converted in to mole fractions ( Xac: 0.00046 and Xwater: 0.9996) With pure vapor pressures of Acetone and water at 120F, I calculated partial vapor pressures of each component.
From my calcs, partial vapor pressure of water is higher than that of Acetone which didn't make sense.
Please help.
Thanks.





RE: Vapor phase concentration
Good luck,
Latexman
To a ChE, the glass is always full - 1/2 air and 1/2 water.
RE: Vapor phase concentration
Is it right to say since total vapor pressure is less than system pressure, there will be no vapor phase?
This is an open pit, so I believe I need to look into calculating evaporation rates of mixtures. Any guidance or reference for determining evaporation rates for mixtures?
RE: Vapor phase concentration
RE: Vapor phase concentration
If you are after the concentration of acetone in the wind sweeping across this pit, try asking the process safety engineer in your Company to build a model of this diffusion process in Phast or similar simulators.
Yes, there will be a vapor phase, but its total closed partial pressure will be less than 1.0atm, so it wont be boiling.