Effects of minerals on cellulose dissolution in ionic liquids and solution spinnability for IONCELL-F textile fibre production
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Journal Title
Journal ISSN
Volume Title
Kemian tekniikan korkeakoulu |
Master's thesis
Authors
Date
2020-08-18
Department
Major/Subject
Chemistry
Mcode
CHEM3023
Degree programme
Master's Programme in Chemical, Biochemical and Materials Engineering
Language
en
Pages
53
Series
Abstract
In the Ioncell® process, fibers are generated from an ionic liquid – cellulose solution via the dry-jet-wet fiber spinning technique. The ionic liquid is washed into the coagulation bath during the fiber regeneration step. Consequently, the removed solvent can be collected, recycled and further reused. [DBNH][OAc] has been approved as a suitable chemical compound for cellulose dissolution in the Ioncell® process (Michud et al., 2016). However, some traces of inorganic cations, such as K+, Ca2+ and Na+ are also dissolved by the ionic liquid. The inorganic salts get more concentrated by increasing of the recycling cycles during the recovery process of the ionic liquid (Parviainen et al., 2015). The presence of inorganic salts might affect the dissolution behavior or even more inhibit the formation of a [DBNH][OAc] - cellulose solution. My thesis focuses on the determination of the solubility of minerals in [DBNH][OAc] and how these mineral impurities influence the production of fibers by the Ioncell® process. Thereby, the solubility of the cations K+ and Na+ is quantitatively determined by Atomic Absorption Spectroscopy. Moreover, different mineral – [DBNH][OAc] – cellulose solutions have been produced and the effect of the K+, Na+ and Ca2+ cations on the spinnability has been investigated. The properties of the produced fibers have been tested and compared with the characteristics of standard fibers, which had been spun from a [DBNH][OAc] – cellulose solution without any additives.Description
Supervisor
Sixta, HerbertThesis advisor
Schlapp-Hackl, IngeKeywords
ionic liquid, solubility, Ioncell-F, man-made fibers