Screw compression process for the conversion of lignocellulosic suspensions containing a high proportion of dry material

A process for the conversion of aqueous suspensions of lignocellulosic solids comprising a solids content of between 1 and 20% of dry material, said process comprising a step a) for compression of said suspensions so as to separate liquid phase present in and between the solids from the compressed solid phase and a step b) for extraction of at least the liquid phase, said liquid phase then being homogenised by heat and/or chemical treatments and re-mixed with the solid phase, said compression a comprising being conducted by a screw compression in a reactor comprising a screw, and wherein the compressed solid phase is also extracted in the extraction step b) and reinjected at the head of the reactor.