Abstract: The process for the dry fractionation of lignocellulosic biomass of at least 50% by weight of lignins, cellulose and hemicelluloses. The biomass is fragmented to obtain an ultrafine powder. The process includes at least one step of separating a fraction enriched with cellulose and a fraction enriched with lignin, hemicelluloses and minerals by electrostatic sorting of the ultrafine particles. Preferably, the fraction separation step includes a step of triboelectrostatic charging of ultrafine particles and at least one step of deviating a path in the electric field of the charged particles to sort the particles.

Abstract: The invention relates to a method for obtaining a composition based on conifer bark enriched in dihydroquercetin or in tannins, comprising the following steps: a) grinding dried shavings of bark from a conifer to obtain a ground particulate material of conifer bark, and b) selecting, from the ground particulate material obtained in step a), the fraction of particles: of smallest size representing at most 40% by weight, relative to the total weight of the ground particulate material obtained in step a), this fraction being enriched in tannins; or of largest size representing at most 50% by weight, relative to the total weight of the ground particulate material obtained in step a), this fraction being enriched in dihydroquercetin.

Abstract: The process for the dry fractionation of lignocellulosic biomass of at least 50% by weight of lignins, cellulose and hemicelluloses. The biomass is fragmented to obtain an ultrafine powder. The process includes at least one step of separating a fraction enriched with cellulose and a fraction enriched with lignin, hemicelluloses and minerals by electrostatic sorting of the ultrafine particles. Preferably, the fraction separation step includes a step of triboelectrostatic charging of ultrafine particles and at least one step of deviating a path in the electric field of the charged particles to sort the particles.

Abstract: A dry method for the fractionation of oilseed cakes. Oilseed cakes are grounded into a powder of ultrafine particles. The ultrafine particles of the powder are triboelectrostatically charged. The path of the charged particles in the electric field is deviated to sort the particles and to provide at least one lignocellulose-enriched fraction.