METHOD FOR TREATING LIGNOCELLULOSIC BIOMASS

The invention relates to a process for treating a lignocellulosic biomass， with: a. Pretreatment of the biomass via at least one cooking or steam explosion operation， so as to obtain a pretreated substrate， b. Liquid/solid separation on at least a portion of the pretreated substrate， comprising two successive substeps: - an upstream substep b1 of contacting the solid/liquid mixture performed with a continuous mixer (M) using a mixing fluid， - a downstream sub-step b2 of extraction/washing performed with a continuous filter， using a washing fluid， to obtain a solid phase enriched in solid and a plurality of liquid phases enriched in liquid， with at least partial recycling of a liquid phase extracted from the filter at the inlet of the mixer as a mixing fluid.