摘要
以松木屑为原料,提取了高纯度的松木纤维素。采用2次碱化、1次酸化的方法,研究了碱化和酸化过程中各因素对松木纤维素纯度的影响,对提取的高纯度松木纤维素进行硝酸乙醇纤维素和α-纤维素含量测试,并用FT-IR和XRD进行分析。得到松木纤维素提取最佳工艺:首先碱处理NaOH质量分数为6%,温度为100℃(反应固液比为1g∶15 mL,处理时间为120 min);然后碱处理NaOH质量分数为12%,固液比为1 g∶40 mL,固定处理温度为100℃处理180 min;最后硝酸、醋酸体积比为1∶3的混酸回流处理(固定反应固液比为1 g∶25 mL,处理时间为30 min)。得到硝酸乙醇纤维素含量和α-纤维素含量分别高达95%、87%以上的松木纤维素。在一定程度上解决了松木屑废料的再利用和环境污染问题,同时为纤维素来源又增添一新途径。
High purity pine cellulose was extracted from pine sawdust by alkalization twice and acidification once. The factors affecting the purity of pine cellulose in the process of alkalization and acidification were studied. The content of α-cellulose and nitric acid-ethanol cellulose in the high purity pine cellulose was determined. The extraction process of cellulose was analyzed by FT-IR and XRD. The results indicated that the optimal extraction conditions were as follows： the mass fraction of NaOH in the primary alkalization at 100 ℃ for 2 h was 6% ; the mass fraction of NaOH in the second ary alkalization at 100 ℃ for 3 h was 12% ; and the ratio of HNO3 and CH3COOH （V： V） in acidification at 100 ℃ for 30 min was 1 ： 3. The contents of nitric acid-ethanol cellulose and α-cellulose in pine cellulose were 95% and 87% , respectively. The problems of recycled use and of environmental pollution of pine sawdust are solved to some extent and a new approach to obtaining cellulose is found as well.
出处
《纺织学报》
EI
CAS
CSCD
北大核心
2013年第12期1-7,共7页
Journal of Textile Research
关键词
松木屑
纤维素
提取
碱性化
pine sawdust
cellulose
extraction
alkalization
