Dissolving lignocellulosic biomass in a 1-butyl-3-methylimidazolium chloride-water mixture.
Dissolving lignocellulosic biomass in a 1-butyl-3-methylimidazolium chloride-water mixture.
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DOI：
10.1016/j.indcrop.2011.12.012
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发表时间：
2012-05
影响因子：
5.9
通讯作者：
Ligang Wei;Kunlan Li;Yingchong Ma;Xiang Hou
中科院分区：
文献类型：
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作者：
Ligang Wei;Kunlan Li;Yingchong Ma;Xiang Hou
离子液体(IL)-水混合物用于处理木质纤维生物质是很有前途的。水的加入降低了粘度，降低了工艺成本，提高了IL的实际应用效果。实验研究了温度(50~170℃)、水分含量(0~80wt%)、处理时间(0.5~4h)和压力(0.1~3.2 Mpa)对1-丁基-3-甲基咪唑氯([C4mim]Cl)-水混合物处理豆类秸秆过程的影响。豆类秸秆部分溶解，加入混凝剂-水(相当于溶液体积)即可使溶解物质絮凝。在0.1 Mpa下，豆科秸秆在150℃、含水量为20wt%的[C4mim]Cl-水混合物中溶解2小时，最大溶出率为29.1wt%，远高于纯[C4mim]Cl溶液中9.8wt%的溶出率。通过加水，可得到木素含量为64.0wt%、纤维素含量为35.3wt%的无半纤维素富含木质素的原料。在含水量为20wt%、150℃、0.1 Mpa的条件下，即使在0.5h内，豆类秸秆的溶出量也达到22.3wt%。高压有利于豆类秸秆的溶解，但残渣中的木质素含量没有明显变化。添加适量的水有利于豆科秸秆的溶解，在[C4mim]Cl-水混合物中可以获得较快的溶解速度。豆科秸秆与所获得的样品(残渣和絮体)由于溶解和重组，其物理化学性质有很大的不同。
An ionic liquid (IL)–water mixture employed to treat lignocellulosic biomass is promising. The addition of water decreases viscosity and process cost so as to improve the IL practical application. In this work, effects of temperature (50–170°C), water content (0–80wt%), treating duration (0.5–4h) and pressure (0.1–3.2MPa) on treating legume straw process using a 1-butyl-3-methylimidazolium chloride ([C4mim]Cl)–water mixture were experimentally investigated. Legume straw was found to be partially dissolved, and the dissolved substances can be flocculated by adding the coagulating agent—water (equal to volume of the solution). For this process at 0.1MPa, the maximum 29.1wt% legume straw is dissolved in the [C4mim]Cl–water mixture with water content of 20wt% at 150°C during 2h, which is much higher than 9.8wt% using pure [C4mim]Cl. A hemicellulose-free lignin-rich material (64.0wt% lignin and 35.3wt% cellulose) is obtained by adding the water. Even for 0.5h, 22.3wt% of legume straw is dissolved in the case of water content of 20wt%, 150°C and 0.1MPa. High pressure favors the dissolution of legume straw but lignin content in the residue has no obvious change. The addition of proper amount of water facilitates the dissolution of legume straw and a relative rapid dissolving rate can be achieved in a [C4mim]Cl–water mixture. There are great differences in chemical and physical properties between legume straw and the obtained samples (residue and floc) due to the dissolution and reconstitution.