Summary of the Monograph of F. I. Samedova «The Application of Supercritical Fluids in Petroleum and Oil Fractions Refining» (scirp.org)
Coffee producers are already using supercritical carbon dioxide to extract caffeine from beans. (scientificamerican.com)
There is also the option for using supercritical water as a pre treatment for AD, and various options for low temperature catalytic gasification. (greencarcongress.com)