Methods for the production of high solids nanocellulose

The present invention provides， among other things， methods including the steps of providing a cellulosic biomass， associating the cellulosic biomass with an organic liquid to form a mixture， treating the mixture to reduce the moisture content of the mixture to 30% or below (if necessary)， and processing the mixture to produce cellulose nanofibrils in a slurry. In some embodiments， provided methods allow for the production of high solids content slurries containing 4% or more cellulosic nanofibrils.