Effects of minerals on cellulose dissolution in ionic liquids and solution spinnability for IONCELL-F textile fibre production

Thumbnail Image

URL

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, Herbert

Thesis advisor

Schlapp-Hackl, Inge

Keywords

ionic liquid, solubility, Ioncell-F, man-made fibers

Other note

Citation

Permanent link to this item

https://urn.fi/URN:NBN:fi:aalto-202008234946

Collections

[dipl] Kemian tekniikan korkeakoulu / CHEM