Diffusion of sulfuric acid within lignocellulosic biomass particles and its impact on dilute-acid pretreatment.
Diffusion of sulfuric acid within lignocellulosic biomass particles and its impact on dilute-acid pretreatment.
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DOI：
10.1016/s0960-8524(01)00197-3
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发表时间：
2002-06
影响因子：
11.4
通讯作者：
Sung Bae Kim;Y. Y. Lee-Y.
中科院分区：
文献类型：
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作者：
Sung Bae Kim;Y. Y. Lee-Y.
研究了硫酸在甘蔗渣、玉米秸秆、稻草和黄杨中的颗粒内扩散，以确定硫酸在多孔生物质结构中的有效扩散系数。利用动态扩散试验室对两种不同大小的生物质进行了25-75℃的扩散实验。农用残渣中硫酸的扩散系数显著高于硬木。每种生物量的扩散系数数据都被拟合到Arrhenius方程中，以便外推到更高的温度。随后将扩散系数数据合并到理论模型中，以确定生物质基质中的酸分布。模拟结果表明，在正常条件下使用生物质原料时，酸的颗粒内扩散会影响稀酸的预处理速率。建立了一个判据来确定在给定的预处理条件下，颗粒内酸扩散成为速率影响因素的临界生物量大小。
Intra-particle diffusion of sulfuric acid into sugarcane bagasse, corn stover, rice straw and yellow poplar was investigated to determine the effective diffusivity of sulfuric acid within the porous biomass structure. Diffusion experiments were conducted over 25–75 °C for two different biomass sizes using dynamic diffusion test cells. Diffusivities of sulfuric acid in agricultural residues were significantly higher than those of hard wood. Diffusivity data for each biomass were fitted into the Arrhenius equation for extrapolation to higher temperatures. The diffusivity data were subsequently incorporated into a theoretical model to determine acid profile within the biomass matrix. The modeling results indicate that intra-particle diffusion of acid influences the rate of dilute-acid pretreatment if unground biomass feedstock is used under normal pretreatment conditions. A criterion was set up to determine the critical biomass size at which the intra-particle acid diffusion becomes a rate-influencing factor for a given pretreatment condition.