Lignin for carbon fibre production (LigniCarb)

Important results from the project

The aim of the project is to evaluate kraft lignin as raw material for production of Carbon Fibre (CF) for structural applications, i.e. as strength carrying parts in advanced composites. The objective of the project is to demonstrate that kraft lignin can be used for production of CF of commercial quality.

Expected long term effects

If kraft lignin can be used as a raw material for production of CFs of commercial grade, a new value-added product will be possible for the forestry industry, leading to a broadening of the product portfolio outside the traditional pulp and paper products. The lower price of kraft lignin as raw material in comparison with todays petro chemical based raw material, can be expected to increase the demand of CFs and thereby result in a stable demand/market of kraft lignin for the forest based industry.

Approach and implementation

The project addresses all steps from raw material to final composite application. The sub-projects cover isolation of kraft lignin, modification and stabilisation including identification of volatile compounds, extrusion, carbonisation and studies of how lignin-based CF function in composites. The influence of purification and modification performed in the early stage of the production will be continuously evaluated, through the in-house availability and use of laboratory extruder and tube furnace for high-temperature treatments of lignin. Advanced techniques will be used for evaluation of chemical, thermal and mechanical properties. A reference group consisting of concerned personnel from Innventia and financing parts will continuously meet to discuss the progress and if necessary re-dispose the activities and budget. A representative of Vinnova will be invited to take part in the meetings.