I'm trying to figure out the saturation concentration of H2 gas into water which has been presurised at 50 bar (and heated at 70 degrees C). I can't seem to find any relevant source of information on this regard.
I know that at 60 degrees C and 1 bar, saturation concentration of H2 is of about 1.2mg/L = 1.2 ppm = 0.6mM. Can't find any updated information regarding higher pressures.
There's a relevant but old paper (attached: Wiebe et al., 1932), but their units are given in 'absorption coeficients' (cc H2 at STP per gram of water). I know that increasing the pressure of the solution should increase the saturation concentration (or H2 solubility), but using the data from this paper I can't seem to get a higher theoretical value for dissolved H2.
I'd appreciate any help.
Dear Eloi,
It depends on the solubility of a gas in liquid which is usually governed by Henry's law given as C = P/K, where C represents the concentration of the dissolved gas (mol/L), K is a constant characteristic of the particular gas (Latm/mol), and P represents the partial pressure of the specific gas above the solution (atm). So for Hydrogen at 25 degree Celisius value of K is 1282.05 Latm/mol. Also data provided by you will value of K at 60 degree Celsius. After getting two values of K you and perform a linear extrapolation to find the value of K at 70 degree celisius.
Once you get get the value of K, put that value in the equation C=P/K and find the concentration.
Thanks for the answers! I finally found this information (https://link.springer.com/content/pdf/10.1007%2F978-3-642-20749-5.pdf) which might be useful for other confused scientists.
Syed, if the information in this link is accurate, the T-dependency is not 100% linear, so be careful!
Best,
Eloi
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