Determining the kinetics of sunflower hulls using dilute acid pretreatment in the production of xylose and furfural

Green Processing and Synthesis

article

Srinivas Reddy Kamireddy¹  Evguenii I. Kozliak²  Melvin Tucker³  Yun Ji¹ 

[1] Department of Chemical Engineering, University of North Dakota;Department of Chemistry, University of North Dakota;National Bioenergy Center, National Renewable Energy Laboratory

关键词: Arrhenius parameters;    hemicellulose;    kinetic model;    pretreatment;    sunflower hulls;   

DOI  :  10.1515/gps-2013-0095

来源: De Gruyter

【 摘 要 】

Pretreatment of sunflower hulls was conducted under varied dilute acid concentrations (0.5–2.0 wt%), reaction temperatures ranging between 140°C and 160°C and the reaction time up to 30 min. The conversion of xylan into xylose and furfural was investigated. The maximum xylose and furfural recoveries, 54.5±0.7 and 24.0±1.1 wt%, respectively, were obtained at different reaction times with 2.0 wt% acid concentration at 160°C. The experimental data were fitted into a two-step kinetic model based on irreversible pseudo-first-order kinetics at each step. The model was successfully validated using the F-test. Sunflower hulls showed a greater recalcitrance to acid pretreatment than other agricultural crops, such as kenaf, sorghum and sunn hemp. This feature was ascribed to the occurrence of a wax layer on the cell wall surface with a high lignin content, which may act as a barrier hindering the acid access to acetyl linkages in xylan.

【 授权许可】

CC BY