A Promising Strategy for Preparation of Cationic Xylan by Environment-Friendly Semi-Dry Oven Process

摘要

A semi-dry oven method, being environmental friendly and simple process with the absence of organic solvents, was applied to prepare cationic xylan by quaternization of xylan with 3-chloro-2-hydroxypropyltrimethylammoniumchloride (CHMAC) using sodium hydroxide as a catalyst in this study. The parameters including reaction time (1-9 h), reaction temperature (50-80 °C), the molar ratio of CHMAC to xylan (0.8-3.0), and the molar ratio of NaOH/CHMAC (0.8-1.6) were optimized and the extent of quaternization was measured by degree of substitution (DS). The appropriate DS between 0.10 and 0.41 was achieved by varying the reaction parameters. Compared to the heterogeneous system (ethanol/water), the relatively higher DS could be obtained by the semi-dry oven method. Moreover, results show that a substantial degradation of the xylan polymers occurred during the modification. Therefore, this study provides feasibility of industrial production of cationic xylan.