作　　者： ; ; ; ; ; ; ; ;

机构地区： 中国科学院

出　　处： 《太阳能学报》 2014年第3期384-390,共7页

摘　　要： 为实现木质纤维素类生物质水解液中糖分的浓缩和纯化,采用截留分子量为200的聚酰胺纳滤膜,对甜高粱渣高温液态水水解液进行浓缩和脱毒处理。研究表明:升高料液温度和增大系统压力均可提高乙酸和糠醛等糖降解物的脱除效率,而料液pH值的增大对带负电荷化合物的脱除不利,优化的纳滤条件为:30℃,0.3 MPa,pH=3。在该条件下水解液浓缩30 min后总木糖浓度从5.23 g/L增加到10.00 g/L,而糠醛、葡萄糖醛酸、乙酸和乙醇酸等副产物浓度不增加。 The sweet sorghum bagasse hydrolysate obtained from the liquid hot water pretreatment was detoxificated and concentrated by nano-fihration （NF） membranes whose molecular-weight cut-off is 200. The results indicated that the rise of temperature and pressure could enhance the removal of sugar degradation products. But some low dissociation constant compound such as formic acid would be rejected by the membrane when the hydrolysate with a high pH value due to the Donnan effect. The optimum NF condition was at 30 ℃, 0.3 MPa and pH=3. Under this condition, the total xylose concentration increased from 5.23 g/L to 10.00 g/L, and the concentration of by-products like furfural, glucuronic acid, glycolic acid and acetic acid did not increase after 30 min NF process.

关 键 词： 纳滤 浓缩脱毒 水解液 甜高粱渣 高温液态水

领　　域： [动力工程及工程热物理]