有机酸和路易斯酸对玉米芯和玉米秸秆生物质水热法制备木糖影响研究

EFFECTS OF ORGANIC ACID AND LEWIS ACID ON XYLOSE PRODUCED BY HYDROTHERMAL TREATMENT OF CORN STOVER AND CORN COB

为确定有机酸和路易斯酸水热法处理玉米芯和玉米秸秆制备木糖的影响因素显著性顺序及最优工艺条件,设计正交实验,考察酸种类、酸浓度、固液比、水解时间和水解温度对木糖得率的影响。对酸种类和酸浓度进行单因素实验设计,采用高效液相色谱对水解液进行分析。结果表明:各因素影响主次顺序为水解时间>固液比>酸种类>水解温度>酸浓度;最佳处理条件为氯化铁作为酸性催化剂,酸浓度15 g/L,固液比1∶12,处理温度170℃,处理时间15 min;秸秆和玉米芯单因素实验皆在添加15 g/L氯化铁时木糖得率达到最大值,分别为22.58%和25.70%。

In order to determine the significant sequence of influencing factors and the optimal process conditions for the production of xylose from corncobs and corn stover by hydrothermal treatment of organic acids and Lewis acids,orthogonal experiments were designed to investigate the effect of acid types,acid concentration,solid-liquid ratio,hydrolysis time and hydrolysis temperature on the yield of xylose.A single-factor experimental is carried out for acid type and acid concentration,and the hydrolysate is analyzed by high performance liquid chromatography.The results show that significant sequence of influencing factors is hydrolysis time>solid-liquid ratio>acid type>hydrolysis temperature>acid concentration;the best treatment conditions are ferric chloride as acid catalyst,acid concentration 15 g/L,solid-liquid ratio 1∶12,treatment temperature 170℃,treatment time 15 min.The single factor experiments of corn stover and corncob both reach the maximum xylose yield which are respectively 22.58%and 25.70%when 15 g/L ferric chloride is added.