Abstract:

In order to efficiently remove lignin from lignocellulose, obtain the cellulose-rich substrate and make full use of lignocellulose components, six kinds of ternary deep eutectic solvent (DES) were prepared and synthesized for pretreatment of poplar hydrolysis residue without hemicellulose. The effects of the six DESs on the lignin removal and cellulose retention were studied, and the pretreatment parameters were optimized. The results showed that among the six DESs, triethyl benzyl ammonium chloride-ethylene glycol-ferric chloride (T-EG-Fe) had the best pretreatment effect, with lignin removal rate of 80.46% and cellulose retention rate of 90.81%. The optimal conditions for T-EG-Fe pretreatment of poplar hydrolysis residue were as follows: reaction solid-liquid ratio 1∶15, reaction temperature 130℃, reaction time 5h. Under the optimal conditions, the content of cellulose and lignin in the solid residue was 92.78% and 5.33%, respectively. T-EG-Fe has the potential for lignin separation in the pretreatment process of lignocellulose.

Key words: deep eutectic solvent, pretreatment, poplar, biomass, enzymatic hydrolysis

摘要：

为高效去除木质纤维素中的木质素，获得富含纤维素的底物，实现木质纤维素组分的单一分离与组分全利用，制备合成了6种三元低共熔溶剂（deep eutectic solvent, DES），利用DES预处理已去除半纤维素的杨木水解渣，研究了6种低共熔溶剂对木质素去除和纤维素保留的影响，并优化获得了最佳的预处理工艺参数。结果表明，6种DES中苄基三乙基氯化铵-乙二醇-氯化铁（T-EG-Fe）的预处理效果最优，木质素去除率为80.46%，纤维素保留率为90.81%。优化得到T-EG-Fe预处理杨木水解渣最佳工艺条件为：反应固液比为1∶15，反应温度为130℃，反应时间为5h，在最优条件下预处理得到的固体残渣中纤维素质量分数为92.78%，木质素质量分数为5.33%。T-EG-Fe具有高效拆解木质素的潜力，在木质纤维素预处理过程中具有一定的应用价值。

关键词: 低共熔溶剂, 预处理, 杨木, 生物质, 酶解