不同纤维素原料超临界水解的研究

Hydrolysis of lignocellulosic feedstock with supercritical water

分别以稻草秸秆、经预处理的稻草秸秆、脱脂棉、微晶纤维素和定性滤纸为原材料,利用间歇式的超临界反应设备,在400℃的盐浴中进行木质纤维素的超临界水解,采用3,5-二硝基水杨酸(DNS)法对产物中的还原糖进行测定,研究反应时间对不同纤维素原料水解产糖的影响。结果表明:在超临界条件下,不同原料在较短的时间内还原糖含量均出现峰值,随着反应时间的延长还原糖产量呈现下降的趋势;稻秆、预处理后的稻秆、脱脂棉、微晶纤维素和定性滤纸的最大产糖量分别为7.42、9.05、12.55、18.01和14.24 g/L;与此对应的最佳反应时间分别为3.5、4、3、3、4 min;对应的最大还原糖产率分别为14.84%、18.10%、25.10%、36.02%、28.48%。

Lignocellulosic materials by using rice straw,pretreated rice straw,absorbent cotton,microcrystalline cellulose,and filter paper were hydrolysis by supercritical water at varied time.The concentration of reducing sugar in the hydrolyzate was tested by 3,5-dinitrosalicylic acid method.The concentration of reducing sugar increased at first,and then decreased with prolonged time.The sugar yields of rice straw,pretreated rice straw,absorbent cotton,microcrystalline cellulose and filter paper were 7.42,9.05,12.55,18.01 and 14.24 g/L,respectively,corresponding the reaction time of 3.5,4,3,3,4 min,concentrations of reducing sugars were 14.84%,18.10%,25.10%,36.02%,28.48%,respectively.