<正>玉米芯是生产木糖的重要原料,木糖水解液的质量直接影响着产品的质量和得率。本文对玉米芯易水解多糖的水解规律及木聚糖水解反应动力学进行了研究。研究结果表明,玉米芯易水解多糖中杂多糖(非木聚糖)含量为10.97％,占易水解多糖含量的28％。在1％H_2SO_4、80℃条件下水解120min,可除去其中71％杂糖和保留94％木糖。在稀酸水解条件下,木聚糖的水解过程符合一级化学反应的规律,两个组分的水解速度常数(min~(-1))分别为:k_1=1.6×10~(12)C~(1.6)exp(-10.2×10~4/RT)和k_(11)=4.2×10~3C~(0.9)exp(-4.4×10~4/RT)。

Corncob is rich in xylan and is a good material for producing xylose or xylitol. Xylose concentration and purty of hydrolysate will affect the quality and yield of product. This paper deals with the research on the hydrolysis of individual sugars in the easily hydrolysable polysaccharide and kinetic studies of xylan hydrolysis. It has been noticed that the total content of non-xylose sugars is as high as 28% of the easily hydrolysable polysaccharide. However, when corcob was hydrolyzed in 1.0 % H2SO4 at 80 C for 120 min,71 % non-xylose sugars in the easily hydrolysable polysaccharide were removed, and 94% xylan in the same fraction was remained. Data of xylose yield, furfural produced and xylan remaining under various hydrolysis conditions showed that the rules of stationary batch case and first-order reaction model can fit the removal of xylan. The hydrolysis rate constants (min~1) of xylan part Ⅰ and part Ⅱ were expressed respectively as follows: