| 陶芙蓉.离子液体对锯末中纤维素的溶解及再生研究[J].分子催化,2013,(5):420-428 |
| 离子液体对锯末中纤维素的溶解及再生研究 |
| The Dissolution and Regeneration of Cellulose in Sawdust from Ionic Liquids |
| 投稿时间：2013-09-05 修订日期：2013-10-22 |
| DOI： |
| 中文关键词: 离子液体 催化水解 杨木锯末 溶解 再生 |
| 英文关键词:Ionic Liquids, Catalysis Hydrolysis, Sawdust, Dissolution, Regeneration |
| 基金项目: |
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| 摘要点击次数: 1458 |
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| 中文摘要: |
| 探讨了离子液体1-(4-磺酸基丁基)-3-甲基咪唑的硫酸氢盐(IL-1)作为催化剂，金属氯化物作为助催化剂时纤维素的水解，利用离子液体IL-1对杨木锯末中纤维素的直接溶解并再生，考察了温度、碱性溶液的浓度以及溶解时间对溶解率的影响，通过傅里叶红外光谱FT-IR、X-射线衍射仪及热失重对处理前后锯末、再生纤维素的结构、结晶性及热性能进行了研究。结果表明，温度为90 ℃，NaOH质量分数为6%，溶解时间为2 h时，离子液体对杨木锯末具有最佳的溶解性，溶解率可达45%左右。离子液体主要溶解杨木锯末中的纤维素，且为非衍生化的直接溶解，再生后的纤维素结晶形态由纤维素I变为II，热稳定性能有所降低。 |
| 英文摘要: |
| Ionic liquid 1-(4-sulfonic acid)-butyl-3-methylimidazolium hydrogen sulfate (IL-1) was used as a catalyst; metal chlorides were used as promoter to catalyze the hydrolysis of cellulose. Also, IL-1 was used to dissolve cellulose in sawdust and cellulose regeneration. Influence of temperature, alkali concentration and time on the dissolution of cellulose in sawdust was investigated. The pretreated sawdust and regenerated cellulose from ionic liquid were characterized using FT-IR spectroscopy, X-ray diffraction and TGA. The results showed that ionic liquid is a good solvent for cellulose, the optimal conditions for cellulose activation were 90 ℃ for 120 min with 6% NaOH, by which 45% of dissolution rate of cellulose was achieved. It was also observed that ionic liquid was a non-detribalizing solvent for cellulose. The regenerated cellulose from ionic liquid showed a crystalline form of cellulose II and was less thermally stable than sawdust. |
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