化学工程2011，Vol.39Issue(9)：16-20,5.
醋酸水解玉米芯中木聚糖的动力学
Kinetics of acetic acid hydrolysis for xylan from corn cobs
岳昌海 1薄德臣 2李凭力1
作者信息
- 1. 天津大学化工学院化学工程研究所,天津300072
- 2. 天津市膜科学与海水淡化技术重点实验室,天津300072
- 折叠
摘要
Abstract
The hemicellulose in corn cobs was hydrolyzed for preparing reducing sugars with acetic acid as catalyst. The yields of reducing sugars and furfural were measured in different hydrolysis time under reaction conditions of 160-200 ℃, solid/liquid mass ratio 1 : 15, stirring speed 500 r/min. By using the Garrote model of the hemicellulose hydrolysis with hot liquid water the formation process of reducing sugar was fitted. The results show that the model can better describe the formation of reducing sugar and the degradation of furfural as a by-products. Reducing sugars formation and degradation rate at different hydrolysis temperatures were identified through the curve fitting. At the same time, the hydrolysis activation energy of xylan is 98. 538 kj/mol and the activation energy of reducing sugars degradation is 172 kj/mol determined with Arrhenius equation. Comprehensive comparison of reducing sugars and furfural mass concentrations in hydrolysate at different temperatures indicate that hydrolysis with acetic acid of mass fraction 5% at 180℃ for 19 min are optimum reaction conditions under which the yield of reducing sugars and furfural can reach 45.135% and 2. 35% , respectively.关键词
醋酸/水解/还原糖/动力学/木聚糖Key words
acetic acid/ hydrolysis/ reducing sugar/ kinetics/ xylan分类
化学化工引用本文复制引用
岳昌海,薄德臣,李凭力..醋酸水解玉米芯中木聚糖的动力学[J].化学工程,2011,39(9):16-20,5.
