Using microwave assisted organic acid treatment to separate cellulose fiber and lignin from kenaf bast
Using microwave assisted organic acid treatment to separate cellulose fiber and lignin from kenaf bast
复制标题
微波辅助有机酸处理分离红麻韧皮中的纤维素纤维和木质素
DOI：
10.1016/j.indcrop.2021.113934
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发表时间：
2021-08-17
影响因子：
5.9
通讯作者：
Jiang, Wei
中科院分区：
文献类型：
--
作者：
Lv, Wanwan;Xia, Zhigang;Jiang, Wei
根据不同的应用目的，采用不同的制备条件，以生物质为原料制备出不同规模的木质纤维素纤维。然而，纤维分离过程中的污染问题制约了相关产业的发展。提出了微波与乳酸联合处理红麻皮纤维的清洁分离技术。并与传统的硫酸盐法进行了比较。采用湿化学分析、SEM、FTIR、GPC和NMR等手段对红麻韧皮原料和纤维进行了表征。结果表明，与传统方法（木质素去除率为88.3%，纤维素分子量为607 kg/mol）相比，新方法具有更高的木质素去除率（94.68%）和更少的纤维素损伤（分子量为1174 kg/mol）。TG和NMR分析表明，分离得到的粗木质素热解温度高（350 ℃），结构变化小，均一性好，接近天然木质素。此外，计算表明，新方法的处理时间减少了82.3%，减少了能量损失和废液污染。研究表明，微波辅助乳酸处理能有效分离红麻纤维，且损伤小、污染小。
According to diverse application purposes, different scales of lignocellulosic fibers were obtained from biomass through various preparation conditions. However, the pollution in the fiber separation process restricted the development of the related industry. This research proposed clean fiber separation technology of kenaf bast that combined microwave and lactic acid treatment. The traditional sulfate method was also carried out for comparison. The raw kenaf bast and produced fibers were characterized with wet chemistry analyses, SEM, FTIR, GPC and NMR. The results showed that compared with the traditional method (lignin removal rate 88.3 %, cellulose Mw = 607 kg/mol), the new method had higher lignin removal capacity (94.68 %) and less damage to cellulose (Mw = 1174 kg/mol). TG and NMR analysis showed that the separated crude lignin had a high pyrolysis temperature (350celcius), minor structural changes and better uniformity, which was close to natural lignin. In addition, it was calculated that the processing time of the new method was reduced by 82.3 %, which reduced energy loss and waste liquid pollution. This study proved that microwave-assisted lactic acid treatment could separate kenaf fibers efficiently with less damage and pollution.