摘要
用稀酸水解半纤维素制得木糖母液,并通过正交实验得到最佳水解条件,即在130℃、稀酸质量分数2%、反应6 h的条件下,水解率可达到96.8%(以稻壳中的半纤维素为基准),去除杂质精制后木糖产率为62.8%.水解后的稻壳残渣用来制备稻壳基多孔炭和二氧化硅,其中多孔炭孔隙发达、孔径均一,可用来对木糖母液进行脱色处理,在脱色过程中对木糖的吸附损失小,达到精制木糖的目的.同时,在制备稻壳基多孔炭的过程中可同步制取高纯度二氧化硅.
Batch hydrolysis of hemicellulose in rice husk was conducted under various operating conditions,and orthogonal test design was adopted to achieve the highest xylose yield. The optimum hydrolysis temperature,sulfuric acid concentration（ mass fraction）,and hydrolysis time were determined to be 130 ℃,2% and6 h,respectively. Hydrolysis rate of 96. 81% was attained under the optimum conditions（ the content of hemicellulose in rice husk was used as benchmark）. Xylose yield of 62. 8% was reached after the impurities were removed from the xylose solution. Porous carbon with well-developed uniform pore structure was prepared by the residue of hydrolyzed rice husk. It had high adsorption capability for pigment in xylose solution,but low adsorption capability of xylose,making it a good adsorbent to purify xylose. Silica of high purity was also obtained during the preparation of porous carbon.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2015年第8期1461-1466,共6页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:21401079)
江苏省自然科学基金(批准号:BK20140158)资助~~
关键词
稻壳
木糖
多孔炭
二氧化硅
吸附
Rice husk
Xylose
Porous carbon
Silica
Adsorption
