Method and apparatus for biomass fractionation

A biomass fractionation apparatus, comprising:

• a biomass supply unit;
• a biomass mixing unit formed below the biomass supply unit, into which biomass supplied from the biomass supply unit is introduced;
• a solvent supply unit formed separately from the biomass supply unit and configured to supply a solvent to the biomass mixing unit;
• a biomass fractionation unit formed below the biomass mixing unit, to which biomass mixed with the solvent in the biomass mixing unit is transferred, and in which cellulose, hemicellulose, and lignin are fractionated;
• a solid collection unit formed below the biomass fractionation unit and configured to collect a solid fraction introduced from the biomass fractionation unit;
• and
• a liquid collection unit formed in connection with the solid collection unit and configured to collect a liquid fraction introduced from the biomass fractionation unit,
• wherein the biomass is supplied to the biomass mixing unit at atmospheric pressure, and is then transferred from the biomass mixing unit to the biomass fractionation unit in a free-fall manner, following a pressure increase caused by the solvent introduced from the solvent supply unit.