Kinetic Studies and Optimization of Dilute Hydrochloric Acid and Nitric Acid Hydrolysis of Corncob for Xylose Production
WU Xiao-Bin, LIU Xiao-Juan, 吕Xue-Bin , ZHANG Yi-Min
1.Key laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University;
2.School of Environmental Science and Technology, Tianjin University
Abstract：
Xylose production by hydrolysis of corncob with dilute hydrochloric acid and nitric acid were studied, in respect to temperature (90-150 ℃), acid concentration (1.0%, 2.5% and 4.0%) and reaction time(10-120 min). Kinetic parameters of mathematical model for predicting the concentrations of xylose were found. The central composite design of response surface method was used to optimize the pretreatment conditions. The results showed that hydrolysis conditions for highest xylose production was 1.0% acid concentration for 10 min at 150 ℃, corresponding to 96.31% (56.77 g/L) total xylan converted to xylose for nitric acid, 76.99%(45.38 g/L) for hydrochloric acid. The models could be successfully used to predict the concentrations of xylose under the experimental conditions. The results showed the hydrolysis effect of nitric acid was much better than that of hydrochloric acid.
WU Xiao-Bin, LIU Xiao-Juan, 吕Xue-Bin , ZHANG Yi-Min.Kinetic Studies and Optimization of Dilute Hydrochloric Acid and Nitric Acid Hydrolysis of Corncob for Xylose Production[J]. Chemcial Industry and Engineering, 2013,30(2): 1-6
2013, Vol. 30 
