桉木自催化水解液表征及高效脱色工艺的研究

丛高鹏; 施英乔; 沈葵忠; 韩善明; 李四辉; 房桂干

doi:10.13386/j.issn1002-0306.2013.19.036

桉木自催化水解液表征及高效脱色工艺的研究

Comprehensive characterization and efficient decoloriztion process for auto-hydrolysate of Eucalyptus prior to pulping

摘要

摘要: 桉木生物质精炼自催化水解糖液富含大量木糖及低聚木糖成分。为实现糖液精炼及高附加值利用,新型高效脱色实验表明,粉末活性炭与聚丙烯酸钠形成沉降性能很好的絮体,脱色效率高且糖保留效果较好。静态脱色优选粉末活性炭AC7,1000r/min磁力搅拌10min后,聚丙烯酸钠10²0mg/kg絮凝,脱色率最高可达95%以上,糠醛去除率接近100%,可溶性木质素去除率达76.5%。利用IC、SEM、FT-IR、GC-MS、ICP-AES等分析手段对该水解液及色素吸附沉淀物进行了综合分析,表明水解色素类物质以木质素及其水解芳香族产物为主,脱色后糖液金属含量较低。

Abstract: The auto-hydrolysate of eucalyptus prior to pulping proved that the hydrolysate was of biomass resources, rich in xylose and xylooligosaccharide.In order to get high value-added product and meet with the engineering operability, experimental results showed that the selected powder activated carbon (AC7) adsorption (with 1000r/min magnetic stirring for 10min) combined with PAANa (10²0mg /kg) flocculation could reach high decoloriztion ratio (above 95%) with good sugar retention.Besides, the furfural and lignin removal ratio reached almost 100% and 76.5% separately.Combined with IC, SEM, FT-IR, GC-MS and ICP-AES analysis of the hydrolysate and pigment in sediment, it proved that lignin and its degradation products greatly contributed to coloring, the heavy mental in hydrolysate after decoloriztion at low level.