Hello. Thank you for interesting in the topic.
what is the difference between Hildebrand and Hansen solubility parameters? I know the definitions and the way of calculation, but can we suppose these two values equal? For example if we have Hansen solubility, can we consider Hildebrand solubility equal that? I calculated the values for methanol and I saw that in that case the values were very close.
From Wikipedia:
"Sometimes Hildebrand solubility parameters are used for similar purposes. Hildebrand parameters are not suitable for use outside their original area which was non-polar, non-hydrogen-bonding solvents. The Hildebrand parameter for such non-polar solvents is usually close to the Hansen value. A typical example showing why Hildebrand parameters can be unhelpful is that two solvents, butanol and nitroethane, which have the same Hildebrand parameter, are each incapable of dissolving typical epoxy polymers. Yet a 50:50 mix gives a good solvency for epoxies. This is easily explicable knowing the Hansen parameter of the two solvents and that the Hansen parameter for the 50:50 mix is close to the Hansen parameter of epoxies."
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This possibly more biased site claims Hanson is always better than Hildebrand"
http://hansen-solubility.com/HSP-science/Hildebrand-parameters.php
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I think it is safe to say Hanson parameters are usually if not always better than Hildebrand parameters
I hope this helps
Thanks a lot Mr. Rick Manner
I read the article which you mentioned. Is this a correct understanding?
"For some hydrocarbons and alcohols, Hildebrand and Hansen solubility parameter are the same, but for others it is not."
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