Hexane Extraction 4 Organic solvents 4 Biodiesel 3 Biomass 3 Fatty acids 3 Free fatty acid 3 Heptane 3 Oil yield 3 Acid concentrations 2 Active components 2 Air conditioning 2 CO2-expanded hexane extraction 2 Carbon dioxide 2 Chlorine compounds 2 Distillation 2 Distillation column 2 Distillation columns 2 Distillation sequences 2 Driving forces 2 Energy conservation 2 Energy efficiency 2 Energy efficient 2 Ethanol 2 Fourier transform infrared spectroscopy 2 Free fatty acid concentration 2 Heating 2 Hexane extraction 2 Loads (forces) 2 Molefraction 2