Mass transport and yield during spinning of lignin-cellulose carbon fiber precursors
Journal article, 2019

Lignin, a substance considered as a residue in biomass and ethanol production, has been identified as a renewable resource suitable for making inexpensive carbon fibers (CFs), which would widen the range of possible applications for light-weight CFs reinforced composites. Wet spinning of lignin-cellulose ionic liquid solutions is a promising method for producing lignin-based CFs precursors. However, wet-spinning solutions containing lignin pose technical challenges that have to be solved to enable industrialization. One of these issues is that a part of the lignin leaches into the coagulation liquid, which reduces yield and might complicate solvent recovery. In this work, the mass transport during coagulation is studied in depth using a model system and trends are confirmed with spinning trials. It was discovered that during coagulation, efflux of ionic liquid is not hindered by lignin concentration in solution and the formed cellulose network will enclose soluble lignin. Consequently, a high total concentration of lignin and cellulose in solution is advantageous to maximize yield. This work provides a fundamental understanding on mass transport during coagulation of lignin-cellulose solutions, crucial information when designing new solution-based fiber forming processes.

ionic liquids

lignin

wet spinning

carbon fiber

biomass

Author

Jenny Bengtsson

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Forest Products and Chemical Engineering

RISE Research Institutes of Sweden

Kerstin Jedvert

RISE Research Institutes of Sweden

Artur Hedlund

RISE Research Institutes of Sweden

Tobias Kohnke

RISE Research Institutes of Sweden

Hans Theliander

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Forest Products and Chemical Engineering

Holzforschung

0018-3830 (ISSN) 1437-434X (eISSN)

Vol. 73 5 509-516

LightFibre – Lignin-based carbon fibres from solution spun prefibres

Swedish Energy Agency, 2016-10-01 -- 2019-09-30.

Subject Categories

Paper, Pulp and Fiber Technology

Chemical Process Engineering

Polymer Technologies

DOI

10.1515/hf-2018-0246

More information

Latest update

2/15/2021