A Promising Strategy for Preparation of Cationic Xylan by Environment-Friendly Semi-Dry Oven Process
A Promising Strategy for Preparation of Cationic Xylan by Environment-Friendly Semi-Dry Oven Process
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DOI：
10.1007/s12221-014-0943-z
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发表时间：
2014-05-01
影响因子：
2.5
通讯作者：
Sun, Runcang
中科院分区：
文献类型：
--
作者：
Kong, Weiqing;Ren, Junli;Sun, Runcang
本文采用半干烘箱法，以氢氧化钠为催化剂，以木聚糖和3-chloro-2-hydroxypropyltrimethylammoniumchloride为原料，采用半干法合成阳离子木聚糖，该方法不需要有机溶剂，对环境友好。对反应时间(1~9h)、反应温度(50~80℃)、CHMAC与木聚糖摩尔比(0.8~3.0)、NaOH/CHMAC摩尔比(0.8~1.6)进行了优化，并用取代度(DS)表征了季铵化程度。通过改变反应参数，得到了取代度在0.10~0.41之间的合适取代度。与非均相体系(乙醇/水)相比，半干烘箱法可以得到相对较高的取代度。此外，结果表明，木聚糖聚合物在改性过程中发生了显著的降解。因此，本研究为阳离子木聚糖的工业化生产提供了可行性。
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 degrees 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.