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Evaluation of the mass transfer effects on delignification kinetics of atmospheric acetic acid fractionation of sugarcane bagasse with a shrinking-layer model
Bioresource Technology ( IF 11.4 ) Pub Date : 2018-04-05
Xuebing Zhao, Ruchun Wu, Dehua Liu

A shrinking-layer model by modification of classical shrinking-core model was developed based on cell wall multi-layered structure for delignification of sugarcane bagasse with sulfuric acid (SA) catalyzed atmospheric acetic acid (AA) fractionation. The general model for overall rate of delignification was obtained and further employed to evaluate the mass transfer effects on delignification. It was found that the external diffusion could be neglected under the studied fractionation conditions, while internal diffusion appeared to play an important role. The effective diffusion coefficient for lignin within the biomass was estimated as 6.7×10-14∼1.6×10-12 m2/s depending on temperature, solid content in the system and molecular weight of lignin. However, surface reaction also seems to be a limiting step to the overall rate of delignification. At the early stage of delignification, both internal diffusion and reaction were controlling steps, while at the late stage reaction seems to be the controlling step.



中文翻译:

收缩层模型评估传质对甘蔗渣中大气乙酸分馏中去木质素动力学的影响

基于细胞壁的多层结构,通过对蔗糖蔗渣进行硫酸(SA)催化的大气乙酸(AA)分级脱木质素作用,开发了一种通过经典收缩核模型修改得到的收缩层模型。获得了整体脱木质素速率的通用模型,并进一步用于评估传质对脱木质素的影响。发现在研究的分馏条件下,外部扩散可以忽略不计,而内部扩散似乎起着重要的作用。生物质内木质素的有效扩散系数被估计为6.7×10 -14 ~1.6×10 -122/ s取决于温度,系统中的固体含量和木质素的分子量。但是,表面反应似乎也成为去木质素总速率的限制步骤。在去木质素化的早期,内部扩散和反应都是控制步骤,而在后期,反应似乎是控制步骤。

更新日期:2018-04-06
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