Supercritical fluid extraction and chemicals from biomass with supercritical fluids

摘要

Supercritical fluid extraction (SCFE) can reduce sample preapration time, and recovery from the methods can be equal or better than that of the classical extraction techniques for solid and semi-solid samples. The properties of a supercritical fluid (SCF) can also improe extraction efficiency and speed. The process is based on the use of dual effect (extraction and entrainment) SCF solvents. Conversion by SCFE of biomass to liquids has been demosntrated with the use of a number of processing configurations. These differnet processing techniques tend to emphasize different mechanism subsets within the large group of potential chemical mechanisms by which biomass is converted to primary products and, thereafter, further covnerted by varying degrees to final products. SCFE with CO_2 is an attractive alternatie to conventional Soxhlet extractions using hazardous organic solvents.