摘要
以造纸原料剩余物竹黄为原料,对两步法生产糠醛的工艺条件分别进行研究。首先对第一步稀硫酸催化水解竹黄半纤维素的工艺条件进行了研究,考察了反应温度、反应时间、硫酸质量分数和固液比对戊糖收率的影响,采用正交试验法,对试验结果进行直观分析,探讨稀硫酸催化水解半纤维素的最优反应条件;然后对第二步半纤维素水解液生产糠醛的工艺条件进行了初步探讨。结果表明:戊糖收率最高的反应条件为液固比10∶1(mL∶g),温度115℃,反应时间2.5 h,硫酸质量分数3.5%,聚戊糖转化率可达到72.06%;在温度154℃,反应时间6 h,体系水解液中硫酸质量分数19.34%,戊糖初始质量分数4.53%的条件下,糠醛收率可达到理论收率的63.36%。
Different hydrolysis conditions were tested for the first hydrolysis step. The variable parameters were studied, such as the reaction temperature, the concentration of dilute sulfuric acid, the liquid-solid ratio and the reaction time. Besides, according to orthogonal experiment to study the optionization conditions of pentose production, visual and variance analysis was made. Hydrolysate for experiments on the second hydrolysis step was produced under these conditions. As a result, at liquid-solid ratio 10： 1 （ mL ： g）, reaction temperature 115 ℃, reaction time 2.5 h, and concentration of sulfuric acid 3.5 %, the optimium pentosan conversion is 72.06 %. At the second step, with a reaction temperature 154 ℃, a reaction time 6 h, a concentration of sulfuric acid 19.34 %, and an initial pentose content 4.53% ,the maximum furfural yield can reach 63.36 % of the theoretical yield.
出处
《林产化学与工业》
EI
CAS
CSCD
北大核心
2011年第6期95-99,共5页
Chemistry and Industry of Forest Products
基金
“十一五”国家科技支撑计划资助(2006BAD18B0502)
关键词
糠醛
两步法
稀酸水解
戊糖
furfural
2-step method
dilute sulfuric acid hydrolysis
pentose
