2 replies to this topic

[drdave]

Sir,
Based on Henry's law,Solubility of Carbon Dioxide into water at atmospheric pressure is quite reliable.But,On pressure of >= 5 kg/cm2g, Its solubility data becomes erratic.Then,
To howmuch extent can we rely upon it?
How to measure / ascertain level of error from estimated value?
Can it be considered as "Indicative" in process work?
May you elaborate on this,please?

[Ming Hooi]

I do not know of any other correlation to predict solubility of CO2 in water, unless empirically. You can find the data in Perry's, these data go up to 700atm.

[siretb]

You'll find extensive data in
Landolt Bornstein (4th volume, 6th ed,) ISBN 3-540-06564-4 Springer Verlag, 1976.
It shows that
between 0 and 70°C the lambda constant slightly decreases with pressure
(lamda= moles dissolved CO2/kilo of water per atmosphere of CO2). Not much below 20 atm.
As usual it decreases with temperature, between 0 and 70°C.
above about 120°C, it increases again with température.
Because of copyright issue I cannot post the graphs, but if you have a few specific points you'd like to have, state the t,P and I could return the corresponding lamdas.
hope this will help.

You say that at P>5 atm, results get erratic. But do you account for water dissociation and CO2/HCO3- equilibrias ?