Adsorption of Lignocellulosic Materials Dissolved in Pre-hydrolysis Liquor of Kraft- Based Dissolving Pulp Production Process on Polymer-modified Activated Carbons

46 J-FOR Journal of Science & Technology for Forest Products and Processes: VOL.1, NO.1, 2011 The extraction of hemicelluloses from wood chips is crucial for producing value-added biomaterials in a forest biorefinery utilization. The low concentration of dissolved lignocellulosic materials dissolved in pre-hydrolysis liquor (PHL) presents a big challenge to the overall utilization processes. In this work, activated carbon (AC) was first modified with polydiallyldimethylammonium (P-DADMAC) chloride or chitosan, and then the modified AC was applied for adsorbing lignocellulosic materials from the PHL. The results showed that the amount of P-DADMAC or chitosan adsorbed on the AC played an important role in the adsorption of lignocellulosic materials. If the mass ratio of PHL to AC was low (20/1 or 40/1) in solutions, the polymer-modified AC had a higher adsorption than the unmodified AC for lignocellulosic materials. However, if the weight ratio was high (140/1), the adsorption of lignocellulosic materials was independent of the modification. Additionally, the P-DADMAC or chitosan modification had a negative effect on the adsorption rate of lignocellulosic materials on AC. XIN LIU, PEDRAM FATEHI* AND YONGHAO NI ADSORPTION OF LIGNOCELLULOSIC MATERIALS DISSOLVED IN PRE-HYDROLYSIS LIQUOR OF KRAFTBASED DISSOLVING PULP PRODUCTION PROCESS ON POLYMER-MODIFIED ACTIVATED CARBONS