PROCESS FOR THE PRODUCTION OF ALCOHOLS AND/OR SOLVENTS FROM PAPERMAKING PULPS WITH RECYCLING OF NON-HYDROLYZED VEGETATION

摘要

This invention describes a process for the production of alcohols and/or solvents from cellulosic or lignocellulosic biomass that comprises at least the following stages:
a) Alkaline chemical pretreatment based on sodium sulfate of a cellulosic or lignocellulosic substrate;b) Washing of the pretreated substrate;c) Enzymatic hydrolysis of the substrate that is pretreated and washed using cellulolytic and/or hemicellulolytic enzymes that produce a hydrolyzate and a water-insoluble residue;d) Microorganism fermentation of the hydrolyzate that is obtained from stage c) and production of a fermentation must that contains at least one alcohol and/or solvent;e) Separation/purification of alcohol and/or solvent, andf) Separation of a cake that contains the insoluble residue, in which at least a portion of the cake that is obtained in stage f) is recycled upstream from the pretreatment stage a) and/or upstream from the washing stage b).