碱法分离回收水稻秸秆中木质素

发布时间：2017-12-31 14:18

本文关键词：碱法分离回收水稻秸秆中木质素　出处：《化工进展》2016年S2期 　论文类型：期刊论文

【摘要】：中国是一个农业大国,拥有丰富的秸秆。农作物秸秆中的木质素是一种天然可再生芳香高聚物,具有良好应用价值。研究秸秆中木质素的分离回收方法对秸秆资源的有效利用有重大意义。目前木质素的分离方法多样化,不同处理方法对木质素的分离具有较大的影响。本文结合木质素与某些金属离子螯合呈可溶性盐这一特点,采用碱法与亚硫酸钠法复合处理秸秆,提出一种简单新型分离秸秆中木质素的方法。通过正交试验研究了氢氧化钠、亚硫酸钠、硫酸锌添加量及pH对木质素分离的影响,并找出一种最佳的木质素分离方案。研究表明氢氧化钠添加量及pH对木质素分离影响显著,随着氢氧化钠浓度及pH的增加,木质素的分离效果增加。其最佳方案中木质素的提取率最高可达97.14%,冻干后木质素回收率为88.97%,制备的木质素磺酸锌盐中锌质量分数为2.4%。本研究为秸秆中木质素的分离回收及秸秆有效利用提供了一种简单的新途径。
[Abstract]:China is a large agricultural country with abundant straw. Lignin in crop straw is a kind of natural renewable aromatic polymer. It is of great significance to study the separation and recovery methods of lignin from straw for the effective utilization of straw resources. At present, the separation methods of lignin are diversified. Different treatment methods have great influence on the separation of lignin. Combined with the characteristic that lignin chelates with some metal ions as soluble salt, the straw was treated by alkali method and sodium sulfite method. A new method for separating lignin from straw was proposed. The effects of sodium hydroxide, sodium sulfite, zinc sulfate and pH on lignin separation were studied by orthogonal experiment. The results showed that the addition of sodium hydroxide and pH had a significant effect on the separation of lignin, with the increase of sodium hydroxide concentration and pH. The extraction rate of lignin was up to 97.14, and the recovery rate of lignin was 88.97% after freeze-drying. The zinc content of the prepared zinc sulfonate is 2.4.This study provides a new simple way for the separation and recovery of lignin from the straw and the efficient utilization of the straw.
【作者单位】：沈阳大学生命科学与工程学院;中国科学院沈阳应用生态研究所;全国农业技术推广服务中心;
【基金】：国家自然科学基金(41271250) 中国科学院基金(XDB15010303)项目
【分类号】：TQ914.3;O636.2
【正文快照】： 3全国农业技术推广服务中心,北京100125)2.4%.This study provides a new approach to separate lignin from straw and realize strawutilization in an effective way.秸秆是一种丰富的可再生物质资源[1]。2015年,全世界农作物秸秆年产量约20亿吨[2],中国占12%左右,并以每年

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