Xylose yields and relationship to combined severity for dilute acid post- hydrolysis of xylooligomers from hydrothermal pretreatment of corn stover

被引:39
作者
Zhang, Taiying [2 ]
Kumar, Rajeev [2 ]
Tsai, Yueh-Du [1 ,2 ]
Elander, Richard T. [3 ]
Wyman, Charles E. [1 ,2 ]
机构
[1] Univ Calif Riverside, Bourns Coll Engn, Dept Chem & Environm Engn, Riverside, CA 92521 USA
[2] Univ Calif Riverside, Bourns Coll Engn, Ctr Environm Res & Technol CE CERT, Riverside, CA 92507 USA
[3] Natl Renewable Energy Lab, Natl Bioenergy Ctr, Golden, CO 80401 USA
关键词
SULFURIC-ACID; SUGAR YIELDS; ENZYMATIC-HYDROLYSIS; CELLULOSE; LIGNOCELLULOSICS; FRACTIONATION; HEMICELLULOSE; OPTIMIZATION; LOADINGS; BAGASSE;
D O I
10.1039/c4gc01283f
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
To maximize yields of fermentable xylose monomer from hydrothermal pretreatment of corn stover at 200 degrees C, the xylooligomers- rich liquor produced was post hydrolyzed with dilute sulfuric acid over a range of times and acid concentrations. The results showed that application of 0.75% H2SO4 at 110 degrees C for 180 min or 0.50% H2SO4 at 110 degrees C for 240 min recovered almost 100% of the total xylose from the oligomers. Furthermore, adjusting one constant in the combined severity parameter ( CSP) provided a rapid and accurate tool for trading off times, temperatures, and acid concentrations to reach the highest xylose yields from xylooligomers in hydrothermal pretreatment solutions. This adjusted CSP showed that an 8.4 degrees C temperature increase has the same impact as doubling the acid concentration or halving reaction time instead of the 10 degrees C change projected by the customary CSP and suggests that xylooligomers bonds are more easily broken than the hemicellulose from which they are derived.
引用
收藏
页码:394 / 403
页数:10
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