NOVELTY - Producing fluff pulp and ethanol from sugarcane bagasse or straw, involves fractionating feedstock to generate solid/liquid slurry comprising cellulose-rich solids, hemicelluloses and lignin, separating the solid/liquid slurry into solid stream comprising the cellulose-rich solids and liquid stream comprising the hemicelluloses and lignin, further treating the cellulose-rich solids, hydrolyzing the hemicelluloses to generate hemicellulose monomers, and fermenting the hemicellulose monomers to cellulosic ethanol.    USE - The method is useful for producing fluff pulp and ethanol from sugarcane bagasse or straw (claimed).    ADVANTAGE - The method is cost-effective to perform.    DETAILED DESCRIPTION - Method for producing fluff pulp and ethanol from sugarcane bagasse or straw, involves (a)(i) obtaining feedstock comprising sugarcane bagasse and/or straw, (ii) fractionating the feedstock in presence of an acid catalyst, solvent for lignin, and water, to generate solid/liquid slurry comprising cellulose-rich solids, hemicelluloses and lignin, (iii) separating the solid/liquid slurry into solid stream comprising the cellulose-rich solids and liquid stream comprising the hemicelluloses and lignin, (iv) further treating the cellulose-rich solids to produce fluff pulp, (v) hydrolyzing the hemicelluloses to generate hemicellulose monomers, and (vi) fermenting at least a portion of the hemicellulose monomers to cellulosic ethanol, where the lignin is removed from the process during one or more of steps (ii)-(vi) and combusted to provide energy, and the process is integrated with, and provides at least some of energy to, first-generation process that ferments sugarcane-derived sucrose to first-generation ethanol, or (b) obtaining a feedstock comprising corn stover, and performing the above-mentioned steps (a)(ii)-(a)(vi), or (c) performing steps (a)(i)-(a)(iii), recovering or further treating the cellulose-rich solids to produce pulp, and performing steps (a)(v)-(a)(vi).