A novel kinetic model for polysaccharide dissolution during atmospheric acetic acid pretreatment of sugarcane bagasse.
Acetic acid (AcH) pretreatment of sugarcane bagasse with the catalysis of sulfuric acid (SA) could greatly enhance the enzymatic digestibility of cellulose. However, polysaccharide dissolution happened inevitably during the pretreatment. It was found that the simplest model, which assumes that the total polysaccharides were reactive to be dissolved, could not well describe the kinetic behavior of polysaccharide dissolution. A novel pseudo-homogenous kinetic model was thus developed by introducing a parameter termed as "potential dissolution degree" (δ(d)) based on the multilayered structure of cell wall. It was found that solid xylan and glucan dissolutions were a first-order reaction with respect to the dissolvable fraction. Due to the delignification action of AcH, polysaccharide dissolutions were enhanced in AcH media compared with those in aqueous system. Acetylizations of cellulose and sugars were also observed, and AcH concentration showed a significant influence on the degree of acetylization.
Institute of Applied Chemistry, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China. Electronic address: zhaoxb@mail.tsinghua.edu.cn.
Xuebing
X
Zhao
Yuichi
Y
Morikawa
Feng
F
Qi
Jing
J
Zeng
Dehua
D
Liu
D019342:Acetic Acid / Q000494:pharmacology*; D001272:Atmosphere / Q000737:chemistry*; D002473:Cell Wall / Q000378:metabolism; D002482:Cellulose / Q000737:chemistry* / Q000378:metabolism; D005936:Glucans / Q000737:chemistry; D006868:Hydrolysis; D007700:Kinetics; D008954:Models, Biological; D015999:Multivariate Analysis; D011134:Polysaccharides / Q000737:chemistry*; D012044:Regression Analysis; D031786:Saccharum / Q000187:drug effects*; D013464:Sulfuric Acids / Q000494:pharmacology; D014990:Xylans / Q000378:metabolism; D014994:Xylose / Q000737:chemistry / Q000378:metabolism
D005936:Glucans; D011134:Polysaccharides; D013464:Sulfuric Acids; D014990:Xylans; D002482:Cellulose; C027433:bagasse; D014994:Xylose; C033158:sulfuric acid; D019342:Acetic Acid
Acetic acid pretreatment; Kinetic modeling; Lignocellulosic biomass; Polysaccharide dissolution; Potential dissolution degree