Continuous process of cellulose dissolution and transesterification reaction catalysed by ionic liquid in twin screw extruder
Continuous process of cellulose dissolution and transesterification reaction catalysed by ionic liquid in twin screw extruder
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双螺杆挤出机中离子液体催化纤维素溶解及酯交换反应连续过程
DOI：
10.1039/d2re00537a
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发表时间：
2023
期刊：
影响因子：
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通讯作者：
Takahashi Kenji
中科院分区：
文献类型：
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作者：
Milotskyi Romain;Sharma Gyanendra;Fujie Tetsuo;Hirose Daisuke;Wada Naoki;Takahashi Kenji
如今，化学工程需要更节能、更环保的工艺。反应挤出是一个新的创新的例子，目标是更清洁，更可持续的过程。在这项工作中，我们首先使用双螺杆挤出机研究了两种浓度（10，20重量%）的微晶纤维素在1-乙基-3-甲基咪唑乙酸盐（EmimOAc）/DMSO的混合物中的溶解度。此外，还开发和讨论了一种测量挤出机内停留时间分布的新方法。将Emim 0Ac/DMSO混合物回收并重复使用。接下来，使用长链酰基供体（月桂酸乙烯酯）进行纤维素的酯交换。使用同向双螺杆挤出机可以以连续方式获得高取代度（2.48-2.67）的产物，该方法的高反应效率（>80%）以及低E因子（3.5）。最后，评价了纤维素浓度对月桂酸纤维素膜的结晶结构和力学性能的影响。
More energy efficient and greener processes are needed today in chemical engineering. Reactive extrusion is an example of a new innovation targeting cleaner and more sustainable processes. In this work, we first examined the solubility of microcrystalline cellulose of two concentrations (10, 20 wt%) in a mixture of 1-ethyl-3-methylimidazolium acetate (EmimOAc)/DMSO using a twin screw extruder. Also, a new method of measuring residence time distribution inside the extruder was developed and discussed. EmimOAc/DMSO mixture was recovered and reused. Next, transesterification of cellulose using a long-chain acyl groups donor (vinyl laurate) was performed. The products of high degree of substitution (2.48–2.67) combined with great reaction efficiency (>80%) of the process as well as low E-factor (3.5) can be obtained in a continuous way using the co-rotating twin screw extruder. Finally, the effect of cellulose concentration on crystalline structure and mechanical properties of cellulose laurate films was evaluated.