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Dissolution of Cellulose: Are Ionic Liquids Innocent or Noninnocent Solvents?
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-06-23 , DOI: 10.1021/acssuschemeng.0c02204
Iurii Bodachivskyi 1 , Charlotte J. Page 2 , Unnikrishnan Kuzhiumparambil 3 , Simon F. R. Hinkley 2 , Ian M. Sims 2 , D. Bradley G. Williams 1
Affiliation  

Cellulose is a naturally abundant and readily accessible substrate for large scale biorefinery technologies. There has been a significant focus on ionic liquids as alternative solvents for the valorization of cellulosic substances. Ionic liquids dissolve cellulose in varying degrees, facilitating ready chemical transformations. However, there is no self-contained set of knowledge and information on the influence (or not) of the simple dissolution process on the cellulose molecule. Herein, we detail the dissolution, recovery, and characterization of cellulose in various classes of ionic solvents in a systematic study. This provides a view of the stability of cellulose in each solvent. We consider the major classes of ionic liquids commonly employed for cellulose chemistry, the dissolution in zinc chloride hydrate systems, quaternary ammonium salts, and deep eutectic solvents under varied processing conditions. We regenerate cellulosic material from the solvent and characterize the polymer employing gravimetric analysis, IR spectroscopy, and size exclusion chromatography. Surprisingly, most ionic liquids employed caused reduction in the MW of the cellulose.

中文翻译:

纤维素的溶解:离子液体是无害还是无害的溶剂?

纤维素是用于大规模生物精炼技术的天然丰富且易于获得的底物。离子液体作为纤维素溶剂的增值替代溶剂已成为人们的主要关注点。离子液体会不同程度地溶解纤维素,从而促进化学转化。但是,没有关于简单溶解过程对纤维素分子的影响(或没有影响)的自成体系的知识和信息。在本文中,我们在系统研究中详细描述了纤维素在各种离子溶剂中的溶解,回收和表征。这提供了纤维素在每种溶剂中的稳定性的观点。我们考虑了纤维素化学中常用的主要离子液体种类,在氯化锌水合物系统中的溶解,季铵盐,以及在各种加工条件下的深共熔溶剂。我们从溶剂中再生纤维素材料,并通过重量分析,红外光谱和尺寸排阻色谱对聚合物进行表征。出乎意料的是,大多数使用的离子液体导致纤维素的MW降低。
更新日期:2020-07-13
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