Understanding Henry's Law in Mass Transfer Systems

[Ciocolatta]

Hi,

How do I calculate the Henry's constant?
If the system has to be at the same temperature, then how do I calculate it for mass transfer system where the inlet and outlet temperatures of the hot and cold streams are changing?

Also, if the Henry's constant is used for two phases in equilibrium, does that mean the rate of mass transfer between the phases are the same? (just confirming)

Also, there was this question about steam humidification by evaporation of water from a milk stream, where they gave me the absolute pressure and temperature of the steam and absolute pressure and temperature of the vapor evaporated from the milk. How would i calculate any partial pressures from these information?

thanks!

 

[uby]

For an ideal gas, Henry's constant relates the partial pressure and concentration of a dilute solute. There are theories which allow for estimation based on solution interaction energies, but generally the value is determined experimentally. It's temperature dependence follows a van't Hoff relationship, which can easily calculate the relative change in a measured value at some temperature other than the measurement temperature.

 

[mbeychok]

Read this article in the Citizendium encyclopedia: Click ==> http://en.citizendium.org/wiki/Henry%27s_law/Draft"

I think you will find it most useful.