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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。
In order to achieve the concentration and purification of sugars in lignocellulosic biomass hydrolyzate, the polyamide nanofiltration membrane with molecular weight cutoff of 200 was used to concentrate and detoxify the high temperature liquid water hydrolyzate of sweet sorghum residue. The results show that increasing the feed temperature and increasing the system pressure can improve the removal efficiency of the sugar degradants such as acetic acid and furfural, while the increase of the pH value of the feed liquid adversely affects the removal of negatively charged compounds. The optimized nanofiltration The conditions were: 30 ° C, 0.3 MPa, pH = 3. Under these conditions, the total xylose concentration increased from 5.23 g / L to 10.00 g / L after 30 min of concentration, while the by-product concentrations of furfural, glucuronic acid, acetic acid and glycolic acid did not increase.