NOVELTY - Producing biomass pellets and sugars from cellulosic biomass, comprises (a) providing a feedstock comprising cellulosic biomass, (b) extracting the feedstock with steam and/or hot water, (c) separating the cellulose-rich solids from the extract liquor, (d) filtering the extract liquor to remove at least some of the lignin, (e) hydrolyzing the hemicellulosic oligomers in the cleaned extract liquor with an acid or enzymes, (f) recovering the hemicellulosic monomers, and (g) pelletizing the cellulose-rich solids to form biomass pellets.    USE - The process is useful for producing biomass pellets and sugars from cellulosic biomass (claimed), and for recovering various co-products, such as sugars, sugar fermentation products, furfural, levulinic acid, fertilizers, and lignin. The fermentable hemicellulose sugars are useful to produce of biochemicals or biofuels such as ethanol, 1-butanol, isobutanol, acetic acid, lactic acid, or any other fermentation products. The fermentation co-product is useful as a fertilizer or fertilizer component. No biological data given.    ADVANTAGE - The process enables the preparation of energy-dense biomass pellets for combustion, while also recovering fermentable sugars from the biomass.    DETAILED DESCRIPTION - Producing biomass pellets and sugars from cellulosic biomass, comprises: either (a) providing a feedstock comprising cellulosic biomass, (b) extracting the feedstock with steam and/or hot water under effective extraction conditions and optionally with an acid catalyst, to produce cellulose-rich solids and an extract liquor containing hemicellulosic oligomers and lignin, (c) separating the cellulose-rich solids from the extract liquor, (d) filtering the extract liquor to remove at least some of the lignin to generate a filter permeate comprising cleaned extract liquor containing the hemicellulosic oligomers and a filter retentate comprising a lignin-rich stream, (e) hydrolyzing the hemicellulosic oligomers in the cleaned extract liquor with an acid or enzymes to generate hemicellulosic monomers, (f) recovering the hemicellulosic monomers, and (g) pelletizing the cellulose-rich solids to form biomass pellets; or the steps (a)-(c) as above per se, (d1) removing at least some of the lignin from the extract liquor to generate cleaned extract liquor and a lignin-rich stream, and the step (g) as above per se. The pelletizing step utilizes at least some of the lignin-rich stream from step (d) or (d1) as a binder or binder component.    DESCRIPTION OF DRAWING(S) - The figure shows a block-flow diagram of a process of producing biomass pellets and sugars from cellulosic biomass.