COMBINED PROCESS FOR THERMALLY AND CHEMICALLY TREATING LIGNOCELLULOSE-CONTAINING BIOMASS AND FOR PRODUCING FURFURAL AND CELLULOSE-CONTAINING FIBER MASSES

摘要

There is disclosed a combined process for the thermal and chemical treatment of lignocellulosecontaining biomass and for the production of furfural and cellulose-containing fiber masses. In order to ensure a high yield of furfural - lignocellulose-containing biomass is continuously fed into a cooker containing a cooking liquor and, upon heating of the biomass in a heating zone and guidance of the heated biomass through a consecutive retention zone, cellulose or pretreated biomass is continuously withdrawn from the cooker, - cooking liquor is continuously withdrawn from the cooker, - the cooking liquor withdrawn is continuously fed to a furfural production plant, and - the cooking liquor at least largely freed from pentoses and furfural is continuously returned to the cooker, wherein heating may be effected by direct steam or via the cooking liquor.