Integrated Separation Process of C5 Sugars and Phenolics from Poplar Wood Using CO2-Assisted Hydrolysis Followed by Hydrogenolysis,ACS Sustainable Chemistry & Engineering

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Integrated Separation Process of C5 Sugars and Phenolics from Poplar Wood Using CO2-Assisted Hydrolysis Followed by Hydrogenolysis
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-12-13 00:00:00 , DOI: 10.1021/acssuschemeng.8b04077
Qiaolong Zhai ₁ , Fanglin Li ₁ , Feng Long ₁ , Fei Wang ₁ , Jianchun Jiang ₁ , Chung-yun Hse ₂ , Junming Xu ₁

Affiliation

This study presents an efficient methodology to remove hemicellulose and lignin from lignocellulosic biomass by a three-step process to obtain C5 sugars, phenolics and high purity cellulose. The first step, a CO₂-assisted hydrolysis pretreatment was conducted for the selective extraction of the hemicellulose fraction. The process effectively extracted hemicellulose at 180 °C with CO₂ at 20 bar initial pressure for 10 min, during which a variety of monosaccharides and other intermediates were obtained. The second step, the catalytic hydrogenolysis of the pretreated feedstock, was performed in a cosolvent isopropyl alcohol–water system with Raney Ni as the catalyst, which can catalyze the depolymerization of lignin components for phenolic products. A variety of phenolic components with lower molecular weights were detected via GC–MS and HSQC. Further treatment with alkaline hydrogen peroxide was used to extract the remaining small amount of lignin and hemicellulose fractions in biomass and to obtain high purity cellulose (>96%). Characterization results indicated that 96% of the lignin and 99% of the hemicellulose could be fractionated by the three-step treatment. This method can be used for the efficient fractionation of hemicellulose, cellulose and lignin, thus achieving high valorization of the entire biomass.

中文翻译：

杨树木材中CO ₅辅助水解加氢解后C5糖和酚类化合物的综合分离工艺

这项研究提出了一种有效的方法，该方法可通过三步过程从木质纤维素生物质中去除半纤维素和木质素，从而获得C5糖，酚类和高纯度纤维素。第一步，进行了CO ₂辅助的水解预处理，以选择性地提取半纤维素级分。该过程可在180°C的条件下用CO ₂有效地提取半纤维素在20 bar的初始压力下持续10分钟，在此期间获得了各种单糖和其他中间体。第二步是在阮内镍作为催化剂的共溶剂异丙醇-水体系中进行预处理原料的催化氢解反应，该反应可以催化酚类产品中木质素组分的解聚。通过GC-MS和HSQC检测到了各种分子量较低的酚类成分。使用碱性过氧化氢进行进一步处理，以提取生物质中剩余的少量木质素和半纤维素馏分，并获得高纯度纤维素（> 96％）。表征结果表明，三步处理可以分离出96％的木质素和99％的半纤维素。

更新日期：2018-12-13

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