High efficiency and clean separation of eucalyptus components by glycolic acid pretreatment
High efficiency and clean separation of eucalyptus components by glycolic acid pretreatment
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DOI：
10.1016/j.biortech.2021.125757
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发表时间：
2021-08-16
影响因子：
11.4
通讯作者：
Yao, Shuangquan
中科院分区：
文献类型：
--
作者：
Luo, Yadan;Li, Yan;Yao, Shuangquan
乙醇酸的化学性质与甲酸相似。因此，与甲酸预处理类似，乙醇酸预处理具有半纤维素的分离效果。采用乙醇酸预处理法对桉木半纤维素进行了有效分离。研究了乙醇酸浓度、温度和时间对纤维素、半纤维素和木质素分离的影响。最佳工艺条件为：酸浓度5.40%，温度140 ℃，时间3.0h。木糖得率最高为56.72%。乙醇酸的回收率为91%。与甲酸相比，木糖产率提高到10.33%，而木质素产率降低到11.08%。该工艺对半纤维素的分离具有很高的选择性，半纤维素的收率为65.48%，纯度为72.08%。抑制了木质素的解聚和再聚合。纤维素结构的完整性得以保留。为木质纤维素生物质的分级分离和高值化转化提供了理论支持。
Glycolic acid has chemical properties similar to those of formic acid. Therefore, similar to formic acid pretreatment, glycolic acid pretreatment has the separation effect of hemicellulose. In this study, eucalyptus hemicellulose was effectively separated by glycolic acid pretreatment. The effects of glycolic acid concentration, temperature and time on the separation of cellulose, hemicellulose and lignin were investigated. The optimum conditions were acid concentration 5.40%, temperature 140 degrees C, time 3.0 h. The highest yield of xylose was 56.72%. The recovery rate of glycolic acid was 91%. Compared to formic acid, the yield of xylose increased to 10.33% while that of lignin decreased to 11.08%. It showed high selectivity for hemicellulose separation, yielding 65.48% hemicellulose with 72.08% purity. The depolymerization and repolymerization of lignin were inhibited. The integrity of the cellulose structure was preserved. It provides theoretical support for the fractional separation and high-value transformation of lignocellulosic biomass.