Production of bio-oil from lignin extracted from kraft black liquor by the Sunmembrane process

It is essential for the pulp and paper industry to utilize as much of the forest raw material as possible to achieve the sustainability goals and to increase the profit. The fibres that are liberated during the kraft pulping process are used for pulp production, while the rest of the components from the wood are mainly incinerated. Lignin is one major byproduct from the kraft pulping process. It has a high heating value, and has not a large market outside internal boiler fuels.