Natural Deep Eutectics as a “Green” Cellulose Cosolvent,ACS Sustainable Chemistry & Engineering

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Natural Deep Eutectics as a “Green” Cellulose Cosolvent
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-08-26 , DOI: 10.1021/acssuschemeng.0c04982
Huy Vu Duc Nguyen ₁ , Renko De Vries ₁ , Simeon D. Stoyanov _{1,

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Affiliation

In this study, we report a novel, green chemistry approach for creating new cellulose solvents based on a mixture of a natural deep eutectic solvent (NADES) and a primary cellulose solvent. Because of the strong hydrogen-bond donor and acceptor ability of both the NADES and the primary cellulose solvent, the new mixed system is a cellulose solvent, with an improved cellulose dissolution capacity. We believe that this is a generic approach to prepare an entirely new class of green solvent, capable of dissolving cellulose under mild conditions. This in turn will facilitate the creation of a large amount of new cellulose-based (soft) materials. To illustrate our approach, we show that a NADES based on choline chloride + malic acid can be used as cosolvent for the industrial cellulose solvent N-methylmorpholine-N-oxide monohydrate (NMMO). The new mixed cellulose solvent system has improved cellulose dissolution capacity and has a much broader processing window, which allows working with dissolved cellulose at ambient temperatures, far below 70 °C, where NNMO monohydrate will solidify. This, in turn, can not only help to address the thermal instability issue of pure NMMO when processed at elevated temperatures, but also expands the working conditions of the lyocell process. The recyclability of the solvent system was also conducted with a recovery yield of more than 95%, validating the sustainability of this solvent system. More importantly, the cellulose dissolution capacity was still maintained after the recycling process. To highlight the potential applications, we have created highly anisotropic reconstituted cellulosic suspensions by the solvent exchange process in different antisolvents.

中文翻译：

天然深层共晶作为“绿色”纤维素助溶剂

在这项研究中，我们报告了一种新颖的绿色化学方法，该方法基于天然深共晶溶剂（NADES）和主要纤维素溶剂的混合物来创建新的纤维素溶剂。由于NADES和主要纤维素溶剂都具有很强的氢键供体和受体能力，因此新的混合体系是纤维素溶剂，具有改善的纤维素溶解能力。我们认为，这是制备全新绿色溶剂的通用方法，该绿色溶剂能够在温和的条件下溶解纤维素。反过来，这将有助于创建大量新的纤维素基（软）材料。为了说明我们的方法，我们表明基于氯化胆碱+苹果酸的NADES可以用作工业纤维素溶剂N-甲基吗啉-的助溶剂。ñ一水合氧化物（NMMO）。新的混合纤维素溶剂系统改善了纤维素的溶解能力，并具有更宽的加工范围，可在远低于70°C的环境温度下与溶解的纤维素一起使用，NNMO一水合物将在此温度下固化。反过来，这不仅可以解决在高温下处理纯NMMO的热不稳定性问题，而且可以扩大莱赛尔工艺的工作条件。还进行了溶剂系统的可回收利用，回收率超过95％，验证了该溶剂系统的可持续性。更重要的是，在循环过程之后仍保持了纤维素的溶解能力。为了突出潜在的应用，

更新日期：2020-09-21

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