Monitoring and Analyzing Process Streams Towards Understanding Ionic Liquid Pretreatment of Switchgrass (Panicum virgatum L.)
Monitoring and Analyzing Process Streams Towards Understanding Ionic Liquid Pretreatment of Switchgrass (Panicum virgatum L.)
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DOI：
10.1007/s12155-010-9087-1
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发表时间：
2010-06-01
影响因子：
3.6
通讯作者：
Singh, Seema
中科院分区：
文献类型：
--
作者：
Arora, Rohit;Manisseri, Chithra;Singh, Seema
生物质预处理及其对糖化动力学，总糖产量和抑制剂形成的影响的基本理解是必不可少的，以开发有效的下一代生物燃料战略，能够取代化石燃料在商业水平。在这项研究中，我们研究了停留时间和温度的影响，在离子液体（IL）预处理柳枝稷使用1-乙基-3-甲基咪唑乙酸盐。预处理性能的主要指标是生物质脱木质素、木聚糖和葡聚糖解聚、孔隙率、表面积、纤维素酶动力学和糖产率。的组合物分析和定量的工艺流的木素和木质素表明，脱木素增加作为预处理温度的函数，并假设与木质素的表观玻璃化转变温度。IL预处理不产生单糖的半纤维素。与未处理的柳枝稷相比，预处理的柳枝稷的Brunauer-Emmett-Teller表面积增加了类似于30的因子，糖化动力学相应增加了类似于40的因子。纤维素酶动力学与脱木质素效率之间存在一定的相关性。虽然IL预处理3小时后观察到生物质完全溶解，但糖释放、糖化动力学和总糖产率的模式与温度强烈相关。
Fundamental understanding of biomass pretreatment and its influence on saccharification kinetics, total sugar yield, and inhibitor formation is essential to develop efficient next-generation biofuel strategies, capable of displacing fossil fuels at a commercial level. In this study, we investigated the effect of residence time and temperature during ionic liquid (IL) pretreatment of switchgrass using 1-ethyl-3-methyl imidazolium acetate. The primary metrics of pretreatment performance are biomass delignification, xylan and glucan depolymerization, porosity, surface area, cellulase kinetics, and sugar yields. Compositional analysis and quantification of process streams of saccharides and lignin demonstrate that delignification increases as a function of pretreatment temperature and is hypothesized to be correlated with the apparent glass transition temperature of lignin. IL pretreatment did not generate monosaccharides from hemicellulose. Compared to untreated switchgrass, Brunauer-Emmett-Teller surface area of pretreated switchgrass increased by a factor of similar to 30, with a corresponding increase in saccharification kinetics of a factor of similar to 40. There is an observed dependence of cellulase kinetics with delignification efficiency. Although complete biomass dissolution is observed after 3 h of IL pretreatment, the pattern of sugar release, saccharification kinetics, and total sugar yields are strongly correlated with temperature.