稻秸秆纤维的高碘酸钠选择性氧化

Selective oxidation process of rice straw fiber by sodium periodate

用碱煮法从稻秸秆中提取纤维,用高碘酸钠对提取的纤维进行选择性氧化,得到二醛基氧化纤维素。研究了氧化剂质量浓度、氧化温度和氧化时间对氧化纤维素的醛基含量和失重率的影响。结果表明,随着氧化剂质量浓度的增加、氧化温度的升高和氧化时间的延长,氧化纤维素的失重率逐渐增大,醛基含量先上升后下降。通过正交试验得出优化的氧化工艺:氧化剂质量浓度15g/L、氧化温度50℃、氧化时间3h。在此工艺下,氧化稻秸秆纤维素的失重率为12.2%,醛基含量为0.590 8mmol/g。

The cellulose fiber is extracted from rice straw using the alkali cooking method, and then the dialdehyde cellulose is obtained by selective oxidation with sodium periodate. The effects of oxidant concentration, oxidation temperature and time on aldehyde group content and mass loss of oxidized rice straw cellulose are investigated. The results show that with the increase in oxidant concentration and oxidation temperature and time, the mass loss of rice straw fiber increases, while the aldehyde group content increases firstly and then decreases. The optimum oxidation process is obtained through orthogonal＇experiments as follows： sodium periodate 15 g/L, oxidation at 50 C for 3 h. The mass loss of oxidized rice straw cellulose is 12.2%, and the content of aldehyde group is 0. 590 8 mmol/g.