稀硫酸水解棉花秸秆制糖的工艺  

Hydrolysis of Cotton Stalk for Fermentable Sugars in Dilute Sulfuric Acid

作　　者：佟毅夫 龚晓武[2] 李勇[2] 朱婷婷[1] 周娜[2] 

机构地区：[1]石河子大学师范学院,石河子832003 [2]石河子大学化学化工学院/新疆兵团化工绿色过程重点实验室,石河子832003

出　　处：《石河子大学学报（自然科学版）》2015年第1期22-26,共5页Journal of Shihezi University(Natural Science)

基　　金：国家自然科学基金项目(21464011);石河子大学国家级大学生创新创业训练计划项目(201310759002);石河子大学高层次人才科研启动项目(RCZX201208)

摘　　要：酸水解是一种既简单又可直接将生物质水解转化成可发酵糖的常见方法。本研究以棉花秸秆为原料,在反应温度为121℃时,考察了硫酸浓度和反应时间对棉花秸秆中半纤维素水解生成可发酵糖产量的影响。在单因素实验的基础上,采用响应曲面法设计实验,建立了硫酸浓度和反应时间影响可发酵糖产量的二元二次多项式数学模型,借助模型方程及统计软件求得121℃时棉花秸秆在稀硫酸中水解的最佳工艺条件。通过验证实验得到:硫酸浓度为2.3%,水解时间为55 min时,棉花秸秆水解得到的可发酵糖产量最高,为11.81 g/100 g棉花秸秆。实验通过对棉花秸秆中半纤维素水解条件的优化,提高了棉花秸秆水解制糖的产率,为新疆棉花秸秆的高值化利用奠定应用基础。Hydrolysis of biomass materials in dilute acid solutions is a simple and direct way to produce fermentable sugars.In this paper, effects of H2SO4 concentration and reaction time on the hydrolysis of cotton stalk for fermentable sugars in dilute sulfuric acid was investigated at 121℃. Based on the results of one-factor-at-a-time（OFAT） experiments, response surface methodology was used to design the experiment, and second-order model equation of fermentable sugar yield was established and used to predict the optimal hydrolysis conditions. The verification experiment indicated that the model equation was reasonable and the corresponding optimal hydrolysis conditions were 2.3% of acid concentration and 55 min. Under these conditions, a maximum fermentable sugar yield of 11.81 g/100 g substrate was obtained. The fermentable sugars yield was enhanced, through the optimization of the hydrolysis condition of cotton stalk, which provided an important application basis for the effective utilization of cotton stalk.

关 键 词：棉花秸秆 半纤维素 水解 稀硫酸 响应曲面法 

分 类 号：TQ353[化学工程]