I need to corroborate if it is necessary to establish several stages of extraction
For instance, I consider electrochemical dissolution of Cu by Fe3+:
Anodic and cathodic half reactions are as follows, respectively:
Cu = Cu2+ + 2e, E0=0.34v
2Fe3+ + 2e = 2Fe2+, E0=0.77v
The potential of cell in standard temperature and pressure is calculated as below:
E0cell = E0cathode - E0anode
= 0.77 - (0.34) = 0.43v
The overall reaction can be defined as:
Cu + 2Fe3+ = Cu2+ + 2Fe2+
in which, copper dissolves in aqueous solution and ferric ion reduces to ferrous ion.
According to Nernst equation:
Ecell = E0cell - RT/nF ln ([Fe2+]2 [Cu2+]/[Fe3+])
By substitution the ions concentrations and other values the equation would be solved.
Dear Jai
The element involved is the oil extacted using Soxhlet extractor
I anticipated this answer from Tabio Garcia. I fully appreciate what Farhad Moosakazemi has written. He is perfectly right in giving the classical explanation in case of copper leaching in presence of iron pyrite. In fact what he has explained is very well studied for chalcopyrite acid leaching. However, I think he should have waited a little, as the author is interested in oil leaching usually from shales. I would say the Nernst Equation has very little or no role in such types of lesching.
Dear Farhad and Jai
Thanks for your criteria and suggestions, they are very interesting. I think that the second law of Fick in a non-stationary state, which studies the concentration variation of the solute, would have a more important role in this type of operations, in this case the oil as a function of the extraction time. I think my research will go that way. Thanks for your support
Dear Jai
If the second fick law is applied, considerations are assumed depending on the raw material and the experimental system. Thanks for your advice and criteria
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