在固定床反应器中进行流经式液态热水处理甘蔗渣预处理固体的结构特性研究。
Structural characterisation of pretreated solids from flow-through liquid hot water treatment of sugarcane bagasse in a fixed-bed reactor.
机构信息
Sugar Milling Research Institute NPC, c/o University of KwaZulu-Natal, Durban 4041, South Africa; Department of Chemistry, Durban University of Technology, P.O. Box 1334, Durban 4000, South Africa.
CSIR/UKZN, Forestry and Forest Product Research Centre, Durban 4041, South Africa.
出版信息
Bioresour Technol. 2015 May;183:259-61. doi: 10.1016/j.biortech.2015.02.057. Epub 2015 Feb 18.
Untreated sugarcane bagasse and sugarcane bagasse pretreated with flow-through liquid hot water (LHW) treatment (170-207°C and 204-250 ml/min) in a fixed-bed reactor have been structurally characterised. Field emission gun scanning electron microscopy (FEG-SEM) and transmission electron microscopy (TEM) were used to investigate changes in the residues, in particular due to the fate of lignin. FEG-SEM results show that the LHW treatment modified the surface morphology of the pretreated bagasse with lignin droplets being observed on the fibre surface. TEM showed an increase in the plant cell wall porosity and lignin migration across the plant cell wall. Increases in pretreatment temperature were observed to increase the average size and density of lignin droplets on the fibre surface. The results provide evidence that for LHW flow-through treatment, just as for batch treatment, lignin repolymerisation and deposition on the surface of pretreated sugarcane bagasse is an important consideration.
未经处理的甘蔗渣和经流动液体热空气（LHW）处理（170-207°C 和 204-250 ml/min）的甘蔗渣预处理在固定床反应器中进行了结构表征。场发射枪扫描电子显微镜（FEG-SEM）和透射电子显微镜（TEM）用于研究残留物的变化，特别是由于木质素的命运。FEG-SEM 结果表明，LHW 处理改变了预处理甘蔗渣的表面形态，纤维表面上观察到木质素液滴。TEM 显示植物细胞壁的孔隙率增加和木质素穿过植物细胞壁迁移。观察到预处理温度升高会增加纤维表面上木质素液滴的平均尺寸和密度。结果表明，对于 LHW 流动处理，就像分批处理一样，木质素的再聚合和在预处理甘蔗渣表面的沉积是一个重要的考虑因素。
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