Critical Pressure of mixture
Critical Pressure of mixture
(OP)
Hi,
What could be the critical pressure of a mixture (suppose N2 and H2O)?
Would it be the critical pressure of N2 and H2O (Both)?
Or, it would be a different one other than both of these?
Many thanks.
Shiplu48
What could be the critical pressure of a mixture (suppose N2 and H2O)?
Would it be the critical pressure of N2 and H2O (Both)?
Or, it would be a different one other than both of these?
Many thanks.
Shiplu48





RE: Critical Pressure of mixture
RE: Critical Pressure of mixture
Psuedocritical Pressure = P'c = yN2 x PcN2 + yH2O x PcH2O
Good luck,
Latexman
To a ChE, the glass is always full - 1/2 air and 1/2 water.
RE: Critical Pressure of mixture
Of course that is when both components are in the gas phase. My impression was a more general case was being considered.
RE: Critical Pressure of mixture
Is Kay's Rule is similarly applicable for liquid mixtures?
Is there any dependency of Critical Temperature and pressure on operating T and P?
Thanks.
RE: Critical Pressure of mixture
Critical temperature (Tc) is a pure component physical property / constant. Tc is the highest temperature at which a pure component can coexist in two phases (liquid and vapor), and the corresponding pressure is the critical pressure (Pc). Being pure component constants, they are not affected by the operating temperature and pressure of your process. Does temperature and pressure affect the molecular weight of nitrogen? No, of course not. It's the same with Tc and Pc; they are experimentally determined constants.
Yes, Kay's Rule is similarly applicable for liquid mixtures. If you had a liquid mixture of 50% N2 and 50% H2O and a vapor mixture of 50% N2 and 50% H2O, you would calculate T'c and P'c using Kay's Rule exactly the same way for both mixtures.
Your process temperature and pressure will affect the psuedoreduced temperature and pressure of the mixture:
T'r = T/T'c
P'r = P/P'c
Good luck,
Latexman
To a ChE, the glass is always full - 1/2 air and 1/2 water.
RE: Critical Pressure of mixture
Forgot about the Star.