摘要
研究了离子液体1-乙基-3-甲基咪唑醋酸盐(EmimAc)对甘蔗的溶解作用,考察了时间、温度以及含水量对离子液体溶解木质素性能的影响。采用FTIR、HPLC、XRD等技术对溶解残渣进行了研究。结果表明,温度70℃、溶解时间为10h时,离子液体EmimAc对甘蔗渣有最好的溶解性能,溶解率可达10.14%。水能显著降低木质素在EmimAc中的溶解性,在含水量达到20%时,溶解率仅有4.37%。HPLC分析表明,甘蔗渣中主要是木质素可溶于EmimAc中。FTIR的结果显示溶解过程中残渣内未发生衍生化反应。残渣的晶型与原料甘蔗渣一致,都是纤维素I,结晶指数由46.78%下降到37.51%。实验结果表明,离子液EmimAc能够有效的溶解甘蔗渣中的木质素,在工业上具有较好的应用前景。
The dissolution and delignification of sugar cane bagasse with ionic liquid 1-ethyl 3-methylimidazolium acetate （EmimAc） was studied with respect to time, temperature and water content in ionic liquid. The residue was charac- terized using FT1R, XRD, HPLC and SEM. For biomass was dissolved in ionic liquid, the optimal conditions to be at 70C for 10h for dissolution of sugar cane bagasse were reported,at which a dissolution rate of 10. 14% was achieved. Water con- tent in ionic liquid was found to be of vital importance in the reaction when it reached 20%, the dissolution decreased to 4. 37%o. The results indicated that EmimAc was a good solvent for lignin. The FTIR results also showed that the dissolution process was a non-detribalizing since no new groups appeared. Compared to the raw sugar cane bagasse, the residues dis played the same crystalline state with cellulose I while the crystalline index was decreased from 46.78% to 37.51%.
出处
《化工新型材料》
CAS
CSCD
北大核心
2013年第6期126-128,共3页
New Chemical Materials
关键词
离子液体
甘蔗渣
木质素
溶解
脱木质素
ionic liquid, sugar cane bagasse, lignin, dissolution, delignification
