A SEMI-EMPIRICAL MODEL FOR PENTOSE AND HEXOSE DISSOLUTION DURING HOT-WATER PRE-EXTRACTION OF BAMBOO
This paper reports on the dissolving behaviors of pentoses, hexoses, furfural and hydroxymethylfurfural(HMF) during bamboo hot-water pre-extraction under different H-factors. According to the results of apparatus analyses, mainly by High Performance Liquid Chromatography(HPLC) and High Performance Anion Exchange Chromatography(HPAEC), the chemical compound of hydrolyzate was composed of pentoses(xylose and arabinose), hexoses(glucose, mannose and galactose), furfural and HMF. The primary goal of this study was to obtain a model for predicting the formation and degradation of pentoses, hexoses, furfural and HMF. In the process of model building, it was found that the hydrogen ion concentration during the process of pre-extraction was another important variable except the reaction activation energies affecting reaction rates of carbohydrate dissolution and degradation. Hence, the hydrogen ion concentration was introduced into the reaction rate equation. Based on the modified H-factors by introducing the hydrogen ion concentration as well as revising the reaction activation energies and frequency factors, a semi-empirical model for predicting the yield of pentoses, hexoses, furfural and HMF was built via considering every step reaction as pseudo first order reaction. The results show that the semi-empirical model, taking advantage of the modified H-factors as independent variable, provides a good description on the carbohydrates’ dissolution and degradation behaviors during the hot-water extraction at the given process conditions. This model will play an important role in the research for the control of carbohydrates dissolution and degradation in bamboo hot-water extraction
the modified H-factor semi-empirical model hot-water pre-extraction bamboo
Hu Huichao Zhan Huaiyu Lv Jian Chai Xinsheng Fu Shiyu
State Key Laboratory of Pulp and Paper Engineering,South China University of Technology, Guangzhou,510640, China
国际会议
广州
英文
252-255
2010-11-08（万方平台首次上网日期，不代表论文的发表时间）