PROCESS CONCEPT OF FOREST BIOREFINERY FOR THE PREHYDROLYSIS KRAFT-BASED DISSOLVING PULP PRODUCTION PROCESS

摘要

The forest biorefinery concept applied to the prehydrolysis kraft-basd dissolving pulp production process was explored. We determined the chemical composition of pre-hydrolysate liquor (PHL) from a commercial plant in Eastern Canada. The PHL contains high amounts of both mono- and oligo- sugars (1.50%-1.65%), and xylose/xylan was the predominate sugar in the PHL. Glucose, galactose and mannose were also found in the PHL. Acetic acid released during pre-hydrolysis was about 25% of the total solids in the PHL. The sum of sugars, acetic acid, lignin and ash contents accounts for 91.4%-95.6% of the total solid content of the PHL. We made further efforts in recovering the hemicelluloses in the PHL, and the results are also presented.