1. Supercritical state
Pure substances can be found in either solid, liquid or gaseous states; in the temperature-pressure diagram (figure 1 ), the regions corresponding to these three states are separated by change-of-state curves converging at the triple point. As it happens, the vaporization curve (liquid-gas) has a stopping point known as the critical point (CP), corresponding to a pressure-temperature pair (p c , T c ) that is fairly easy to reach for most simple organic compounds.
Beyond this critical point ( and ...
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Supercritical state
Extraction and fractionation
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