a method for the production of alcohol and other bioproducts hemicelluloses extracted from biomass prior to thermal conversion of the biomass to energy . the process can be integrated with the host plant process to minimize the energy loss from extracting hemicelluloses . also disclosed is a stepwise enzymatic break down of cellulose fibers from a pulping operation which is performed with the redeployment of equipment and vessels contained within typical existing pulp and paper manufacturing mills . the preferred feedstock is highly delignified pulp from acid or alkaline pulping process or from bleaching stage .