Mass transport and yield during spinning of lignin-cellulose carbon fiber precursors
Artikel i vetenskaplig tidskrift, 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.

lignin

ionic liquids

biomass

wet spinning

carbon fiber

Författare

Jenny Bengtsson

RISE Research Institutes of Sweden

Chalmers, Kemi och kemiteknik, Kemiteknik

Kerstin Jedvert

RISE Research Institutes of Sweden

Artur Hedlund

RISE Research Institutes of Sweden

Tobias Kohnke

RISE Research Institutes of Sweden

Hans Theliander

Chalmers, Kemi och kemiteknik, Kemiteknik

Holzforschung

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

Vol. 73 5 509-516

LightFibre – Ligninbaserad kolfiber från lösningsspunnen prefiber

Energimyndigheten, 2016-10-01 -- 2019-09-30.

Ämneskategorier

Pappers-, massa- och fiberteknik

Kemiska processer

Polymerteknologi

DOI

10.1515/hf-2018-0246

Mer information

Senast uppdaterat

2019-06-07