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Low energy recycling of ionic liquids via freeze crystallization during cellulose spinning
Liu, YR; Meyer, AS; Nie, Y; Zhang, SJ; Thomsen, K; Liu, Yanrong; Meyer, Anne S.; Nie, Yi; Zhang, Suojiang; Thomsen, Kaj
2018
Source PublicationGREEN CHEMISTRY
ISSN1463-9262
Volume20Issue:2Pages:493
Abstract

A new method for recycling ionic liquids (ILs) from a cellulose spinning process is suggested. The method involves the combination of freeze crystallization and evaporation of H2O from IL + H2O mixtures to recycle the ILs. Processes with EmimAc and EmimDep were used as references to develop this IL recycling method. EmimAc + 12.5 wt% H2O and EmimDep + 4 wt% H2O were selected for a quantitative mass and energy analysis of the cellulose spinning and IL recycling process (the maximal initial H2O levels in the ILs + H2O mixtures for cellulose dissolution were determined experimentally). The energy requirement for the freeze crystallization + evaporation method was compared to evaporation only for recycling of EmimAc and EmimDep. To produce 1 kg dry cellulose fiber, 45.4 MJ and 62.6 MJ are required for recycling EmimAc and EmimDep respectively by the freeze crystallization + evaporation recycling method. Using evaporation only, 66.9 MJ is required for EmimAc recycling and 99.9 MJ for EmimDep recycling per kg cellulose fiber produced. Thus, to fabricate 1 kg dry cellulose fiber using freeze crystallization + evaporation rather than evaporation, 21.5 MJ can be saved for EmimAc and 37.3 MJ for EmimDep recycling. We also show that compared to a classical Lyocell fiber production method using N-methylmorpholine-N-oxide (NMMO) as solvent, use of ILs is energy saving in itself. Hence, significantly less H2O is required in the cellulose spinning process with ILs than with NMMO, and in turn less H2O has to be evaporated for the solvent recycling.

Other Abstract

We would like to sincerely thank Liangyu Ma and Wenjun Wang for helping with the MCC solubility and MCC morphological properties study. This work was supported by the Department of Chemical and Biochemical Engineering, Technical University of Denmark and CAS/SAFEA International Partnership Program for Creative Research Teams (Grant No. 20140491518), General Program of National Natural Science Foundation of China (Grant No. 21576262 and 2157060191).

Keyword1-ethyl-3-methylimidazolium Acetate Dissolution Water Dispersions Solubility Separation Cosolvent Mixtures Fiber
SubtypeArticle
DOI10.1039/c7gc02880f
Language英语
Funding OrganizationDepartment of Chemical and Biochemical Engineering, Technical University of Denmark ; CAS/SAFEA [20140491518] ; National Natural Science Foundation of China [21576262, 2157060191]
WOS IDWOS:000423337500020
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/26818
Collection中国科学院过程工程研究所
Recommended Citation
GB/T 7714
Liu, YR,Meyer, AS,Nie, Y,et al. Low energy recycling of ionic liquids via freeze crystallization during cellulose spinning[J]. GREEN CHEMISTRY,2018,20(2):493.
APA Liu, YR.,Meyer, AS.,Nie, Y.,Zhang, SJ.,Thomsen, K.,...&Thomsen, Kaj.(2018).Low energy recycling of ionic liquids via freeze crystallization during cellulose spinning.GREEN CHEMISTRY,20(2),493.
MLA Liu, YR,et al."Low energy recycling of ionic liquids via freeze crystallization during cellulose spinning".GREEN CHEMISTRY 20.2(2018):493.
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